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JP2006115192

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DESCRIPTION JP2006115192
PROBLEM TO BE SOLVED: To provide an audio output device having a configuration capable of
generating an output audio signal having an optimal output voltage level by optimal gain control
for each audio output connection terminal corresponding to a plurality of outputs with a simple
configuration. . An audio output apparatus according to the present invention includes a
connection detection unit that detects whether a device is connected to each of a plurality of
audio output connection terminals to which an audio signal can be output, and a connection by
the connection detection unit. According to the detection result, while determining one or more
audio output connection terminals for outputting an audio signal, referring to a gain setting table
for performing optimal gain control on the audio signal output to the audio output connection
terminal, A gain setting unit that sets a gain value according to a volume adjustment value, a
digital volume controller that performs volume adjustment of digital audio signal data using the
set gain value, and digital audio signal data as an analog audio signal D / A converter for A / A
conversion and predetermined conversion to an analog audio signal, and according to the
connection detection result of the audio output connection terminal And an output unit for
outputting to the one or more audio output connection terminals determined. [Selected figure]
Figure 1
Voice output device
[0001]
The present invention relates to an audio output device, and more particularly to an audio output
device having a plurality of outputs such as a speaker output, a headphone output, an audio and
a video output.
09-05-2019
1
[0002]
Among audio output devices having an audio reproduction function and an audio output
function, there are those having a plurality of audio outputs such as a speaker output, a
headphone output, an audio and a video output.
[0003]
FIG. 6 is a block diagram showing an example of the configuration of a conventional audio output
device having a plurality of audio outputs.
[0004]
A conventional audio output device includes a central processing unit (CPU: Central Processing
Unit) 7 that controls various operations of the entire device, and a digital signal processing
device (DSP: Digital) that performs predetermined processing on input digital audio signal data.
Gain control is performed by operating the Signal Processor 1) and a volume adjustment key, and
a digital volume controller 2 performs volume adjustment of digital audio signal data, and D / A
for D / A converting digital audio signal data to analog audio signals. A converter 3 and an
amplifier 11 dedicated to speaker output for amplifying an analog audio signal with a gain of a
value optimum for audio output from the built-in speaker 4 and an analog audio signal with a
gain of a value optimum for audio output from a headphone 5 Amplifier 12 dedicated to
headphone output for amplification, and video and audio such as television (TV) 6 The amplifier
13 dedicated to audio and video (line) output that amplifies an analog audio signal with a gain
that is an optimal value for audio output from the audio device, the audio output connection
terminal 21 to which the built-in speaker 4 is connected, and the headphone 5 are connected
Audio output connection terminals (jacks), which are connected with an audio output connection
terminal 22 having a connection detection mechanism for detecting the presence or absence of
connection, and an audiovisual apparatus 6 requiring line connection of audio and video output
It is an audio output connection terminal (jack), and the audio output connection terminal 23
which has a connection detection mechanism which detects the presence or absence of
connection is provided.
[0005]
In the conventional audio output device, even when audio output is performed from any of the
plurality of outputs including the speaker 4, the headphone 5, and the audiovisual apparatus 6,
the user operates the volume adjustment key interlocked with the digital volume controller 2. By
doing this, gain control in the digital volume controller 2 is performed.
[0006]
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Then, digital audio data gain controlled in the digital volume controller 2 is D / A converted to an
analog audio signal by the D / A converter 3 and then dedicated amplifiers 11 and 12 having
optimal gains corresponding to the respective outputs. , 13, and audio output is performed from
one or more connected devices among the speaker 4, the headphone 5, and the audiovisual
device 6.
[0007]
Since the presence or absence of connection is detected at the audio output connection terminals
22 and 23, when the headphone 5 and the audiovisual device 6 are not connected to either of
the audio output connection terminals 22 and 23, the audio output connection terminal 22 is ,
23 are detected by the CPU 7, and the CPU 7 mutes the audio output of the headphone 5 and the
audiovisual apparatus 6 so that the audio output is performed only from the speaker 4. The
control signal is transmitted to the amplifiers 12 and 13, and the audio output from the audio
output connection terminals 22 and 23 is cut off.
[0008]
On the other hand, the amplifier 11 outputs an analog audio signal optimally amplified to the
audio output from the built-in speaker 4, and the speaker 4 performs audio output based on the
analog audio signal.
[0009]
When the headphone 5 or the audiovisual device 6 is connected to any one of the audio output
connection terminals 22 and 23, the headphone 5 or the audiovisual device 6 is connected to one
of the audio output connection terminal 22 or 23 Is detected by the CPU 7, and the CPU 7
outputs the speaker 4 and the headphones 5 or 5 so that an audio output is performed only from
the headphones 5 or the audiovisual apparatus 6 connected to one of the audio output
connection terminals 22 or 23. To mute the other audio output of the audio output connection
terminal 22 or 23 to which the audiovisual apparatus 6 is not connected, a mute control signal is
transmitted to either the amplifier 11 or the amplifier 12 or 13, and the audio is output. The
audio output from the other of the output connection terminal 21 and the audio output
connection terminal 22 or 23 is cut off.
[0010]
On the other hand, the amplifier 12 or 13 corresponding to one of the audio output connection
terminal 22 or 23 to which the headphone 5 or the audiovisual apparatus 6 is connected is
optimally amplified to the audio output from the headphone 5 or the audiovisual apparatus 6 An
analog audio signal is output, and audio output is performed from the headphone 5 or the
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audiovisual apparatus 6 based on the analog audio signal.
[0011]
Furthermore, when the headphone 5 and the audiovisual device 6 are respectively connected to
both of the audio output connection terminals 22 and 23, the headphone 5 and the audiovisual
device 6 are respectively connected to both of the audio output connection terminals 22 and 23
Is detected by the CPU 7 so that the CPU 7 outputs audio from the headphones 5 and the
audiovisual apparatus 6 connected to the audio output connection terminals 22 and 23, while
the speaker 4 does not output audio. In order to mute the audio output of the speaker 4, a mute
control signal is transmitted to the amplifier 11, and the audio output from the audio output
connection terminal 21 is cut off.
[0012]
On the other hand, from the amplifiers 12 and 13 corresponding to the audio output connection
terminals 22 and 23 to which the headphone 5 and the audiovisual apparatus 6 are respectively
connected, an analog amplified optimally for audio output from the headphone 5 and the
audiovisual apparatus 6 Audio signals are respectively output, and audio output is performed
from the headphones 5 and the audiovisual apparatus 6 based on the analog audio signals.
[0013]
In the above-mentioned audio output device having an audio reproduction function and a
plurality of outputs such as a speaker output, a headphone output, an audio and a video output,
each output at the time of speaker output, headphone output, audio and video output Because of
differences in impedance load and frequency characteristics in the above, the way of hearing the
finally output voice is different, so the output voltage level required at the audio output
connection terminal to which each device is connected is also different.
[0014]
Therefore, in the conventional audio output device, as shown in FIG. 6, an amplifier 11 having an
optimum gain for each audio output connection terminal corresponding to a plurality of outputs
such as speaker output, headphone output, audio and video output, 12, 13 are provided.
[0015]
However, the configuration of the conventional audio output device in which a plurality of
amplifiers are provided for each of the audio output connection terminals corresponding to a
plurality of outputs requires parts for configuring the amplifier for each of the audio output
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connection terminals, which is complicated. There are problems such as an increase in the
mounting area of components and high manufacturing costs.
[0016]
Also, in the conventional audio output device configuration, if the amplifier is a single amplifier
sharing each audio output connection terminal corresponding to a plurality of outputs, it is
optimal for other output devices except for specific output devices. Gain control will not be
performed, and it is inconvenient for the user to perform voice output with an appropriate
volume desired, as it is necessary to adjust each time with the volume adjustment key.
[0017]
An audio output device different from the above-described audio output device having a plurality
of outputs but having a single audio output connection terminal shared by a plurality of devices,
the device connected to the audio output connection terminal In order to specify the output
voltage level required as an output to the audio device, the acoustic device which detects the
impedance of the device connected to the audio output connection terminal and sets the output
voltage level based on the value of the detected impedance It has been proposed and known until
now (see, for example, Patent Document 1).
[0018]
However, when the audio output device is provided with a single audio output connection
terminal shared by a plurality of devices, the audio output device generates an audio output
signal having an optimal output voltage level according to the connected device. The
configuration of the audio output device is not simplified, and conversely, the configuration of
the entire device is increased by the addition of the configuration for setting the output voltage
level based on the impedance detection. It is complicated.
JP-A-9-148861
[0019]
An object of the present invention is an audio output device having a configuration capable of
generating an output audio signal having an optimal output voltage level by optimal gain control
for each audio output connection terminal corresponding to a plurality of outputs with a simple
configuration To provide.
09-05-2019
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[0020]
According to the audio output device of the present invention, there is provided a connection
detection unit for detecting whether or not an apparatus is connected to each of a plurality of
audio output connection terminals to which an audio signal can be output, and a connection
detection result by the connection detection unit. While determining one or more audio output
connection terminals for outputting an audio signal according to the volume adjustment with
reference to a gain setting table for performing optimal gain control on the audio signal output to
the audio output connection terminal. Gain setting unit that sets the value of gain according to
the value, Digital volume controller that performs volume adjustment of digital audio signal data
using the set gain value, Digital audio signal data to analog audio signal D / A A predetermined
conversion is performed on the D / A converter to be converted and the analog audio signal, and
according to the connection detection result of the audio output connection terminal
Characterized in that it comprises an output unit for outputting a constant to one or more audio
output connection terminals, and.
[0021]
In the above-described configuration of the audio output device according to the present
invention, the output unit may include an amplifying unit that amplifies an analog audio signal
with a gain of a fixed value.
[0022]
According to the audio output device of the first embodiment of the present invention, the first
audio output connection terminal to which the speaker is connected, and the connection
detection mechanism for detecting the presence or absence of connection are connected, and the
headphones are connected. A third audio output connection terminal to which a second audio
output connection terminal and a connection detection mechanism for detecting the presence or
absence of connection are connected and to which an audiovisual device requiring a line
connection of audio and video output is connected; A gain setting for performing optimal gain
control on an audio signal output to the audio output connection terminal while determining one
or more audio output connection terminals that output an audio signal according to a connection
detection result using a detection mechanism Refer to the table, set the value of the gain
according to the volume adjustment value and transmit the gain setting section, and Adjust the
volume of digital audio signal data using the value of the received gain Digital audio volume
controller, D / A converter for D / A converting digital audio signal data to analog audio signal,
and amplifying the analog audio signal with a gain of a fixed value to obtain the second and third
audio output connection terminals. And an amplifier shared with each audio output connection
terminal to be output to the audio output connection terminal determined according to the
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connection detection result.
[0023]
According to the audio output device of the second embodiment of the present invention, the
first audio output connection terminal to which the speaker is connected, and the connection
detection mechanism for detecting the presence or absence of connection are connected, and the
headphone is connected. A third audio output connection terminal to which a second audio
output connection terminal and a connection detection mechanism for detecting the presence or
absence of connection are connected and to which an audiovisual device requiring a line
connection of audio and video output is connected; A gain setting for performing optimal gain
control on an audio signal output to the audio output connection terminal while determining one
or more audio output connection terminals that output an audio signal according to a connection
detection result using a detection mechanism Refer to the table, set the value of the gain
according to the volume adjustment value and transmit the gain setting section, and Adjust the
volume of digital audio signal data using the value of the received gain Digital volume controller,
D / A converter for D / A converting digital audio signal data to analog audio signal, and auxiliary
amplification of analog audio signal by a predetermined gain for audio output from the built-in
speaker A built-in amplifier for speaker output, a built-in amplifier for headphone output for
auxiliary amplification of an analog audio signal by a predetermined gain for audio output from
the headphone, an analog audio signal for audio output from the audiovisual apparatus A D / A
converter and an amplifier mixed IC in which a built-in amplifier for line output is provided
which additionally amplifies with a gain of a predetermined value.
[0024]
In the above configuration of the audio output device according to the first and second
embodiments of the present invention, the first audio output connection terminal may be an
audio output connection terminal to which a built-in speaker is previously connected. .
Alternatively, the first audio output connection terminal may have a connection detection
mechanism for detecting the presence or absence of connection, and may be an audio output
connection terminal to which a speaker is connected.
[0025]
In each of the above configurations, when there are two or more audio output connection
terminals determined in accordance with the connection detection result of the audio output
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connection terminal, the gain setting unit determines whether the gain is high with reference to
the audio output connection terminal having high priority. It is good to set a value.
[0026]
The gain setting table may be stored in the gain setting unit.
Alternatively, a storage device for storing the gain setting table may be further provided.
[0027]
The gain setting table may be configured to correspond to each audio output connection
terminal.
[0028]
The gain setting table may be configured by digital volume attenuation values corresponding to
each audio output performed via each audio output connection terminal.
[0029]
The audio output device according to the present invention can generate an output audio signal
having an optimal output voltage level by optimal gain control with a simple configuration for
each audio output connection terminal corresponding to a plurality of outputs. .
[0030]
That is, in the audio output device according to the present invention, a gain setting table
prepared in advance for gain control optimal for an audio signal to be output to a device
connected to the audio output connection terminal determined according to the connection
detection result. The digital audio signal data before D / A conversion is referred to, so that the
audio output is performed by the optimum gain control according to the type of the device that
outputs the audio, and the D / A converter is performed. It is possible to simplify the
configuration of the device by using only the amplifier shared with each audio output connection
terminal having a constant value gain, simplifying the configuration of the device, and
suppressing the mounting area and manufacturing cost of components. it can.
09-05-2019
8
[0031]
Conventionally, the amplifier disposed at the output stage of the D / A converter is commonly
used as means for adapting and amplifying the gain of the audio signal according to the output
destination, but in the configuration of the present invention, the amplifier is the gain There is no
need to use the circuit as an adaptation means and an amplification means, and therefore it is
also possible to dispense with the amplifier of the output stage of the D / A converter if it is
sufficient to control the gain just before the D / A converter.
[0032]
Hereinafter, an embodiment of an audio output device according to the present invention will be
described in detail with reference to the drawings.
[0033]
FIG. 1 is a block diagram showing the configuration of the audio output device according to the
first embodiment of the present invention.
[0034]
The audio output device according to the first embodiment of the present invention is an audio
output connection terminal 21 to which the built-in speaker 4 is connected and an audio output
connection terminal (jack) to which the headphone 5 is connected. An audio output connection
terminal 22 having a connection detection mechanism for detecting presence / absence and an
audio output connection terminal (jack) to which an audiovisual apparatus such as a television
(TV) 6 requiring a line connection of audio and video output is connected The audio output
connection terminal 23 having a connection detection mechanism for detecting the presence or
absence of connection and the audio output connection terminal for outputting an audio signal
according to the connection detection result of the audio output connection terminals 22 and 23
The gain value according to the volume adjustment value with reference to the gain setting table
for performing optimal gain control on the audio signal output to the audio output connection
terminal A central processing unit (CPU) 7 that controls various operations of the entire
apparatus, including setting and transmission, a digital signal processing unit (DSP) 1 that
performs predetermined processing on input digital audio signal data, and reception The digital
volume controller 2 performs volume adjustment of digital audio signal data using the value of
the gain, the D / A converter 3 for D / A converting the digital audio signal data to an analog
audio signal, and the analog voice The amplifier 10 is shared with each audio output connection
terminal, which amplifies the signal and outputs the signal to the audio output connection
terminal determined according to the connection detection result of the audio output connection
terminals 22 and 23.
09-05-2019
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[0035]
In the audio output device according to the first embodiment of the present invention, the built-in
speaker 4 is connected among the plurality of audio output connection terminals 21, 22, 23 from
which audio signals can be output. A connection detection unit that detects whether a device is
connected to any of the audio output connection terminals 22 and 23 excluding the audio output
connection terminal 21 and a voice signal is output according to the connection detection result
by the connection detection unit. Gain setting terminal according to the volume adjustment value
with reference to the gain setting table for performing optimum gain control on the audio signal
output to the audio output connection terminal while determining the audio output connection
terminal to be A digital volume controller 2 for adjusting the volume of digital audio signal data
using the setting unit, and the value of the set gain; Audio output connection determined
according to the connection detection result of the audio output connection terminals 22 and 23
by amplifying the analog audio signal with the D / A converter 3 for D / A converting the analog
audio signal to D / A and And an amplifier 10 shared with each audio output connection terminal
to be output to the terminal.
[0036]
The connection detection unit in the above aspect corresponds to the connection detection
mechanism of the audio output connection terminals 22 and 23 and the CPU 7.
The CPU 7 corresponds to the gain setting unit.
The gain setting table may be stored in the CPU 7, but may be stored in a storage device such as
a ROM (not shown).
[0037]
In the audio output device according to the first embodiment of the present invention, first, the
audio output connection to which the built-in speaker 4 is connected among the plurality of
audio output connection terminals 21, 22, 23 from which audio signals can be output Connection
detection provided in the audio output connection terminals 22 and 23 whether or not a device
such as a headphone 5 or a television (TV) 6 is connected to any of the audio output connection
terminals 22 and 23 excluding the terminal 21 It detects by CPU7 using a mechanism.
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[0038]
In the present embodiment, the speaker 4 is described as the built-in speaker 4 built in the voice
output device, but there is also a voice output device without the built-in speaker, and a voice
having a connection detection mechanism A speaker may be connected to the output connection
terminal in the same manner as other devices.
[0039]
FIG. 2 is a circuit diagram showing an example of an electrical configuration of a connection
detection mechanism provided in the audio output connection terminal.
[0040]
The connection detection mechanism includes a resistor R1 and an npn bipolar transistor Q1
connected in series between the power supply potential node VDD and the ground potential
node, and a resistor R2 connected between the power supply potential node VDD and the base of
the npn bipolar transistor Q1. , A switch SW1 whose one end is connected to the base of the npn
bipolar transistor Q1, and a resistor R3 connected between the other end of the switch SW1 and
the ground potential node.
[0041]
The switch SW1 is built in the audio output connection terminal (jack) of the audio output device,
and the non-conduction / conduction state is switched by the change in pressure due to the
insertion / extraction of the audio input connection terminal (plug) of the device performing
audio output. It is
[0042]
When nothing is connected to the audio output connection terminals (jacks) 22 and 23 of the
audio output device according to the first embodiment of the present invention, the switch SW1
is in the conductive state, and the headphone 5 and the television When the audio input
connection terminal (plug) of a device such as (TV) 6 is inserted and connected, the switch SW1
becomes nonconductive due to the pressure, and the resistor R3 is disconnected from the base of
the npn bipolar transistor Q1 and the resistor R2. Be
As a result, the conduction / non-conduction state of the npn bipolar transistor Q1 is switched to
change the collector potential, and the CPU 7 detects the collector potential as a connection
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detection signal to connect the audio output connection terminals (jacks) 22 and 23. It is possible
to detect the presence or absence of connection of devices.
[0043]
FIG. 3 is a flowchart showing an operation procedure of audio output processing by the audio
output device according to the present invention, and FIG. 4 is a table showing an example of a
gain setting table used in the audio output device according to the present invention.
[0044]
When voice output processing is started in the voice output device according to the present
invention (step S0), the apparatus to each voice output connection terminal (jack) 22, 23 is used
using the above-described connection detection mechanism shown in FIG. The presence or
absence of connection is detected by the CPU 7 (step S1).
When the speaker 4 is not connected to the built-in speaker but is connected by the user to an
audio output connection terminal having a connection detection mechanism, the presence or
absence of the connection of the device is the CPU 7 like the audio output connection terminals
22 and 23. Detected by
[0045]
After the connection detection, the CPU 7 determines an audio output connection terminal for
audio output according to the result (step S2).
When the connection of the device is not detected in any of the audio output connection
terminals 22 and 23, it is determined that the audio output is performed from the audio output
connection terminal 21 to which the built-in speaker 4 is connected. Or when connection of the
device is detected to any one of 23, it is determined that audio output is to be performed from
the audio output connection terminal, and connection of the device is detected to both of the
audio output connection terminals 22 and 23 It is determined that audio output is to be
performed from both of the audio output connection terminals 22 and 23.
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However, even when the connection of the device is detected in either one or both of the audio
output connection terminals 22 and 23, audio may be simultaneously output from the built-in or
externally connected speaker 4.
[0046]
When audio output is performed from a plurality of audio output connection terminals including
the audio output connection terminal 22 to which the headphone 5 is connected, in the present
embodiment, an optimal value is set preferentially for the headphone output. Although setting of
gain or digital volume attenuation amount described later is performed with reference to the
headphone output, it is optional whether to set an optimum value for which output preferentially.
[0047]
When the audio output connection terminal for performing audio output is determined, the CPU
7 refers to the gain setting table shown in FIG. 4 as an example, according to the adjustment
value of the volume adjustment key provided in the audio output device main body The optimal
gain value for digital audio signal data corresponding to the audio output from the output
connection terminal is set (step S3).
In the table of FIG. 4, the gain setting is shown as digital volume attenuation (dB) in the digital
volume controller 2.
[0048]
Speaker output when audio output is performed from the audio output connection terminal 21 to
which the speaker 4 is connected, and headphone output, audio and video output line connection
when audio output is performed from the audio output connection terminal 22 to which the
headphone 5 is connected When audio output is performed from the audio output connection
terminal 23 to which an audiovisual device such as a television (TV) 6 requiring an audio output
is performed, the digital volume attenuation amount (dB) of line output, the adjustment value of
the volume adjustment key Set according to
[0049]
As described above, in the connection detection of each of the audio output connection terminals
22 and 23, when the connection of the device to both of the audio output connection terminals
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22 and 23 is detected, in this embodiment, the headphone output is detected. Digital volume
attenuation (dB) is preferentially adopted and set.
[0050]
Further, with respect to other audio output connection terminals for which audio output is not
performed, mute processing is performed under the control of the CPU 7 (step S3).
[0051]
When the value of the gain for the audio signal to be output to the audio output connection
terminal for audio output, that is, the digital volume attenuation amount (dB) is set, the digital
volume controller 2 uses that value to control the gain for digital audio signal data A process is
performed (step S4).
[0052]
Thereafter, the digital audio signal data subjected to gain control processing is D / A converted to
an analog audio signal by the D / A converter 3 (step S5), and further, the analog audio signal has
each audio output having a constant gain. The signal is amplified by the amplifier 10 shared with
the connection terminal (step S6), is output to the audio output connection terminal determined
according to the connection detection result, and the audio output from the device connected to
the audio output connection terminal is executed ( Step S7).
[0053]
Incidentally, when an audio output connection terminal for performing audio output is
determined according to the connection detection result of each of the audio output connection
terminals 22 and 23 (step S2), the switchable output connection terminal of the amplifier 10 is
determined. It is connected to the audio output connection terminal.
The connection control is performed by the CPU 7.
[0054]
As described above, in the audio output device according to the present invention, the gain
control optimal for the audio signal to be output to the device connected to the audio output
connection terminal determined according to the connection detection result is prepared in
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advance. Since it is performed on digital audio signal data before D / A conversion with reference
to the gain setting table, the audio output is performed by the optimum gain control according to
the type of the device that performs audio output, and The configuration of the device can be
simplified as an amplifier disposed at the output stage of the / A converter is only an amplifier
shared with each audio output connection terminal having a gain of a fixed value, and the
mounting area and manufacturing cost of parts are reduced. can do.
[0055]
Although the amplifier disposed at the output stage of the D / A converter has conventionally
been used both as means for adapting the gain of the audio signal according to the output
destination and as amplification means, in the configuration of the present invention, the
amplifier is Does not need to be used as gain adaptation means and amplification means, and
therefore, it is not necessary to provide an amplifier at the output stage of the D / A converter if
it is sufficient to control gain only at the previous stage of the D / A converter. .
That is, the amplifier at the output stage of the D / A converter is not an essential component and
can be omitted as the case may be.
[0056]
FIG. 5 is a block diagram showing the configuration of the audio output device according to the
second embodiment of the present invention.
[0057]
The audio output device according to the second embodiment of the present invention is an
audio output connection terminal 21 to which the built-in speaker 4 is connected and an audio
output connection terminal (jack) to which the headphone 5 is connected. An audio output
connection terminal 22 having a connection detection mechanism for detecting presence /
absence and an audio output connection terminal (jack) to which an audiovisual apparatus such
as a television (TV) 6 requiring a line connection of audio and video output is connected The
audio output connection terminal 23 having a connection detection mechanism for detecting the
presence or absence of connection and the audio output connection terminal for outputting an
audio signal according to the connection detection result of the audio output connection
terminals 22 and 23 The gain value according to the volume adjustment value with reference to
the gain setting table for performing optimal gain control on the audio signal output to the audio
output connection terminal A central processing unit (CPU) 7 that controls various operations of
09-05-2019
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the entire apparatus, including setting and transmission, a digital signal processing unit (DSP) 1
that performs predetermined processing on input digital audio signal data, and reception The
digital volume controller 2 performs volume adjustment of digital audio signal data using the
value of the gain, the D / A converter 3 for D / A converting the digital audio signal data into an
analog audio signal, and the audio from the built-in speaker 4 A built-in amplifier for speaker
output 31, which amplifies the analog audio signal by the gain of a predetermined value for
output, and a headphone output, which amplifies the analog audio signal by the gain of a
predetermined value for audio output from the headphone 5 For audio output from audiovisual
equipment such as built-in amplifier 32 and television (TV) 6 And a grayed audio signal with
audio and video (line) output for the internal amplifier 33 D / A converter and an amplifier
embedded IC30 embedded with the auxiliary amplified by the gain of the predetermined value.
[0058]
The audio output device according to the second embodiment of the present invention includes a
D / A converter 3, a built-in amplifier 31 for speaker output, a built-in amplifier 32 for
headphone output, audio and a voice output device instead of the D / A converter 3 and the
amplifier 10. It differs from the audio output device according to the first embodiment of the
present invention in that it includes a D / A converter and an amplifier mixed IC 30 in which a
built-in amplifier 33 for video (line) output is mixed.
[0059]
The D / A converter and amplifier mixed IC 30 is an IC conventionally used as a D / A converter
having a built-in auxiliary amplifier, but since each built-in amplifier only plays an auxiliary role,
for example, When incorporated into the conventional audio output device shown in 6, it is
merely replaced with the D / A converter 3 and the amplifiers 11, 12, 13 disposed in the output
stage of the D / A converter 3 are necessary. It is essential and can not be removed.
[0060]
However, in the audio output device according to the second embodiment of the present
invention, before D / A conversion by D / A converter 3 as in the audio output device according
to the first embodiment of the present invention described above Since optimal gain control is
performed on digital audio signal data at the digital processing stage of S, it is sufficient for the
output stage of the D / A converter 3 to have auxiliary built-in amplifiers 31, 32, and 33, It is not
necessary to provide external amplifiers 11, 12, 13 as in the prior art.
[0061]
Therefore, as in the audio output device according to the second embodiment of the present
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invention, the configuration of the device can be simplified even when the D / A converter and
amplifier mixed IC 30 are used.
[0062]
The main part of the operation procedure of the audio output device according to the present
invention described with reference to FIGS. 2 to 4 is common to the audio output devices
according to the first and second embodiments of the present invention. Description of the
second time is omitted.
[0063]
The DSP 1 in the audio output device according to the first and second embodiments of the
present invention is not an essential component, and is provided to speed up processing of digital
audio signal data. If all the processing can be executed by the CPU 7, the DSP 1 may not be
provided.
[0064]
FIG. 1 is a block diagram showing a configuration of an audio output device according to a first
embodiment of the present invention.
It is a circuit diagram which shows an example of an electrical configuration of the connection
detection mechanism with which the audio | voice output connection terminal is equipped.
It is a flowchart which shows the operation | movement procedure of the audio | voice output
process by the audio | voice output apparatus based on this invention.
It is a table which shows an example of the gain setting table used in the voice output device
concerning the present invention.
It is a block diagram which shows the structure of the audio | voice output apparatus based on
the 2nd Embodiment of this invention.
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It is a block diagram which shows an example of a structure of the conventional audio | voice
output apparatus which has several audio | voice output.
Explanation of sign
[0065]
1 Digital Signal Processor (DSP: Digital Signal Processor) 2 Digital Volume Controller 3 D / A
Converter 4 Speaker 5 Headphones 6 Television (TV) 7 Central Processing Unit (CPU: Central
Processing Unit) 10 Audio Output Connection Terminal Shared Amplifier 11 Speaker output
dedicated amplifier 12 Headphone output dedicated amplifier 13 Audio and video (line) output
dedicated amplifier 21, 22, 23 Audio output connection terminal 30 D / A converter and
amplifier mixed IC 31 Speaker output built-in amplifier 32 Headphone output built-in amplifier
33 Built-in amplifier for audio and video (line) output R1, R2, R3 resistance Q1 npn bipolar
transistor SW1 switch
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18
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