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JP2011035529

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2011035529
The present invention provides an audio output device that does not require an amplifier for an
external speaker when using an external speaker. An audio output device according to one aspect
of the present invention includes a main body portion provided with a terminal for connecting an
external speaker, a speaker portion that covers the terminal and is detachably connected to the
main body portion, and amplifies an audio signal. And an amplification unit for input to the
terminal and the speaker unit. [Selected figure] Figure 1A
Voice output device
[0001]
The present invention relates to an audio output device provided with a connection terminal of
an external speaker.
[0002]
Among conventional audio output devices, there is one in which a speaker is disposed inside a
stand that supports a display unit that displays an image (Patent Document 1).
[0003]
Japanese Patent Publication No. 2003-518345
[0004]
09-05-2019
1
However, conventional audio output devices are not considered for the use of external speakers.
For this reason, when outputting an audio | voice by connecting an external speaker, the
amplifier (amplifier) for external speakers is newly required.
[0005]
The present invention has been made to solve such conventional problems, and it is an object of
the present invention to provide an audio output device that does not require an amplifier for an
external speaker when using an external speaker.
[0006]
An audio output device according to an aspect of the present invention includes a main body
portion provided with a terminal for connecting an external speaker, a speaker portion that
covers the terminal and is detachably connected to the main body portion, amplifies an audio
signal, and And an amplifying unit for input to the speaker unit.
[0007]
According to the present invention, it is possible to provide an audio output device that does not
require an amplifier for an external speaker when using an external speaker.
[0008]
It is a front view of the audio output device concerning a 1st embodiment (at the time of
connection).
It is a rear view of the audio output device concerning a 1st embodiment (at the time of
connection).
It is a front view of the voice output device concerning a 1st embodiment (at the time of
separation).
09-05-2019
2
FIG. 2 is a back view of the audio output device according to the first embodiment (at the time of
separation).
It is a figure which shows the structure of STB.
It is a figure which shows the structure of the processing system of the audio | voice signal which
concerns on 1st Embodiment. It is a flowchart which shows operation | movement of the audio |
voice output apparatus which concerns on 1st Embodiment. It is a figure which shows the
structure of the processing system of the audio | voice signal which concerns on a comparative
example. It is a figure which shows the structure of the processing system of the audio | voice
signal which concerns on a comparative example. It is a figure which shows the transient
characteristic which concerns on a comparative example. It is a figure which shows the transient
characteristic which concerns on a comparative example. It is a figure which shows the transient
characteristic which concerns on a comparative example. It is a figure which shows the transient
characteristic which concerns on 1st Embodiment. It is a figure which shows the transient
characteristic which concerns on 1st Embodiment. It is a figure which shows the transient
characteristic which concerns on 1st Embodiment.
[0009]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings. First Embodiment FIGS. 1A and 1B are a front view and a back view of an audio
output device 10 according to a first embodiment (at the time of connection). 2A and 2B are a
front view and a back view of the audio output device 10 according to the first embodiment (at
the time of separation).
[0010]
The audio output device 10 includes an STB (Set top box) 10A, a speaker unit 10B, a display unit
10C, and a stand 10E. The STB 10A decodes a broadcast signal of a broadcast station or the like
input from an antenna (not shown) to generate a video signal and an audio signal. The STB 10A
inputs the generated video signal and audio signal or the video signal and audio signal input
from an external storage and reproduction device (including a reproduction device) 21 to the
speaker unit 10B and the display unit 10C. Further, when using an external speaker, the STB 10A
includes terminals O1 and O2 (connection terminals) for connecting the external speaker.
09-05-2019
3
[0011]
The speaker unit 10B is a two-way speaker including woofers W1 and W2 (speaker for bass) and
tweeters T1 and T2 (speaker for treble) for stereo sound reproduction. The woofer W1 and the
tweeter T1, and the woofer W2 and the tweeter T2 are respectively disposed on the left side and
the right side of the integrally formed speaker box. The woofers W1 and W2 and the tweeters T1
and T2 included in the speaker unit 10B output voice based on the voice signal (stereo voice
signal or monaural voice signal) input from the STB 10A.
[0012]
The speaker unit 10B has a connecting member 10D that covers the terminals O1 and O2 and
detachably connects the speaker unit 10B to the main unit (STB 10A and display unit 10C). The
connecting member 10D combines the transparent acrylic plate d1 and the two thin metal stays
d2 to connect the speaker unit 10B to the STB 10A. As a result, the speaker unit 10B appears to
float from the main unit (STB 10A and display unit 10C). In addition, the structure is strong in
strength.
[0013]
When the speaker unit 10B is connected to the STB 10A (when the speaker unit 10B is used), the
terminals O1 and O2 are covered by the connecting member 10D, and thus external speakers can
not be connected. When the speaker unit 10B is not connected to the STB 10A (when the speaker
unit 10B is not used), since the terminals O1 and O2 are exposed, external speakers can be
connected.
[0014]
The STB 10A and the speaker unit 10B are connected by a connector, and an audio signal is
transmitted from the STB 10A to the woofer W1, W2 and the tweeter T1, T2 of the speaker unit
10B. Further, when the connector is connected, the wiring for detecting the connection of the
speaker unit 10B is connected to the wiring grounded in the speaker unit 10B, and it can be
09-05-2019
4
detected that the speaker unit 10B is connected. . The wiring for transmitting the audio signal
and the wiring for detecting the connection of the speaker unit 10B are connected to the STB
10A through the metal stay d2. Thereby, the wire can be wired neatly.
[0015]
The display unit 10C displays an image based on the image signal input from the STB 10A. The
stand 10E supports the STB 10A, the speaker unit 10B, and the display unit 10C.
[0016]
The storage and reproduction device 21 is a DVD (Digital Versatile Disk) player or recorder or a
hard disk drive (HDD) recorder or the like for storing and reproducing content. The storage and
reproduction device 21 is connected to the audio output device 10 by means such as HDMI or
analog connection. The storage and reproduction device 21 inputs a video signal, an audio signal,
and a control signal of content to be reproduced (for example, a movie or PV (Promotion video))
to the audio output device 10. In HDMI, cables for video signals, audio signals, and control
signals are integrated, so that the wiring can be simplified.
[0017]
FIG. 3 is a diagram showing the configuration of the STB 10A. The STB 10A includes a channel
selection unit 101, a terminal 102, an I / F 103, a separation unit 104, a decoding unit 105, an
audio signal processing unit 106, an amplification unit 107, and a remote control reception unit
108.
[0018]
The tuning unit 101 tunes in a desired channel from the broadcast signal received by the
antenna. The tuner 101 demodulates the selected broadcast signal to generate a TS (Transport
stream).
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[0019]
The terminal 102 is an HDMI, an analog input terminal, or the like for connecting the storage
and reproduction device 21. An interface (I / F) 103 is an interface for transmitting and receiving
data and receiving video / audio signals with the storage and reproduction device 21 connected
to the terminal 102.
[0020]
The separation unit 104 separates a broadcast signal, SI / PSI, and the like from the TS generated
by the tuner 101. TS is a multiplexed signal including a broadcast signal, SI / PSI. The broadcast
signal is, for example, a broadcast signal of MPEG-2. The broadcast signal is an audio elementary
stream (ES) and a video elementary stream (ES) obtained by encoding each of video and audio.
PSI is information that describes what program exists in the TS and which program each ES
included in the TS belongs to. Further, SI includes EPG (Electric program guide) information
(program information).
[0021]
The decoding unit 105 decodes the audio ES and the video ES separated by the separation unit
104 to generate an audio signal and a video signal. The generated audio signal is input to the
audio signal processing unit 106. The generated video signal is input to the display unit 10C. The
display unit 10C displays a video based on the video signal input from the decoding unit 105 or
the video signal input from the storage and reproduction device 21 via the terminal 102.
[0022]
The audio signal processing unit 106 is configured by a circuit such as a DSP (digital signal
processor). The audio signal processing unit 106 processes an audio signal input from the
storage and reproduction device 21 via the decoding unit 105 or the terminal 102, and includes
tweeters T1 and T2 included in the speaker unit 10B, woofers W1 and W2, and STB 10A. Input
to terminals O1 and O2. The amplification unit 107 amplifies the audio signal input from the
audio signal processing unit 106.
09-05-2019
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[0023]
FIG. 4 is a diagram showing the configuration of a processing system of audio signals according
to the first embodiment. The audio signal processing unit 106 includes a control unit 106a, a
mute unit 106b, a detection unit 106c, a signal processing unit 106d, a high pass filter (HPF)
106e, and a low pass filter (LPF) 106f. The amplification unit 107 includes AMPs (Amplifiers)
107a and 107b.
[0024]
The audio signal input to the audio signal processing unit 106 is separated into two systems for
woofer and tweeter. The separated audio signals are processed by the signal processing unit
106d, the HPF 106e, and the LPF 106f, respectively, amplified by the AMPs 107a and 107b of
the amplification unit 107, and then input to the speaker unit 10B and the terminals O1 and O2.
[0025]
Hereinafter, configurations of the audio signal processing unit 106 and the amplification unit
107 will be described in detail. The mute unit 106 b mutes the input audio signal in response to
an instruction from the control unit 106 a. That is, the mute unit 106b stops the output of the
audio signal to the HPF 106e in the subsequent stage. The signal processing unit 106 d
processes the input audio signal. Specifically, processing such as volume control, sound quality
setting (amplification / attenuation of bass / treble) and surround is performed.
[0026]
The HPF 106 e passes the high-frequency component (high frequency component) of the audio
signal input from the signal processing unit 106 d and inputs the high frequency component to
the AMP 107 a. The LPF 106 f passes the bass component (low frequency component) of the
audio signal input from the signal processing unit 106 d and inputs the low frequency
component to the AMP 107 b. The AMP 107a amplifies the audio signal input from the HPF
106e and inputs the amplified audio signal to the tweeters T1 and T2. The AMP 107 b amplifies
the audio signal input from the LPF 106 f and inputs the amplified audio signal to the woofers W
09-05-2019
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1 and W 2 and the terminals O 1 and O 2.
[0027]
The HPF 106 e and the LPF 106 f are filters of FIR type (Finite impulse response: finite impulse
response), and can realize linear phase (constant delay) characteristics which can be
approximately realized only by an analog filter. The linear phase is a characteristic in which the
phase characteristic is linear for any frequency. That is, since all frequency components are
delayed by the same time, it is possible to reproduce a faithful waveform without disturbing the
waveform. Therefore, system adjustment is possible without considering the phase delay in the
filtering process. The comparison results with the analog filter will be described later with
reference to FIGS. 7A to 8C.
[0028]
The detection unit 106c detects the presence or absence of connection of the speaker unit 10B.
Wiring for detecting connection of the speaker unit 10B is connected to the detection unit 106c.
The detection unit 106 c applies a constant voltage to the wiring to detect the potential of the
wiring. When the speaker unit 10B is connected, that is, when the STB 10A and the speaker unit
10B are connected by a connector, one end of the wiring for detecting the connection of the
speaker unit 10B is grounded, so the potential of the wiring Changes (drops). The detection unit
106c detects a change in the potential of the wiring to detect the presence or absence of
connection of the speaker unit 10B.
[0029]
The control unit 106a controls the mute unit 106b and the LPF 106f in accordance with the
presence or absence of the connection of the speaker unit 10B. The presence or absence of the
connection of the speaker unit 10B is recognized by the detection signal from the detection unit
106c. The connection state of the speaker unit 10B may be set (stored) by a remote control 109
described later, and the presence or absence of the connection of the speaker unit 10B may be
confirmed based on the contents of the setting (storage).
[0030]
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When the speaker unit 10B is not connected, it is necessary to output sound from an external
speaker. Therefore, the control unit 106a controls the mute unit 106b to stop (mute) the output
of the audio signal. Further, the control unit 106a bypasses the audio signal, that is, turns off the
filter function of the LPF 106f so as to directly input the input audio signal to the AMP 107b. By
the above control, an unfiltered voice is output from an external speaker connected to the
terminals O1 and O2.
[0031]
When the speaker unit 10B is not connected, no sound is output from the speaker unit 10B.
Therefore, the mute unit 106b may be omitted. However, by providing the mute unit 106b, it is
possible to suppress the emission of unnecessary noise from the connector or wiring connecting
the STB 10A and the speaker unit 10B. In addition, the same effect can be obtained by
controlling the operation of the AMP 107a by the control unit 106a (turning off the AMP 107a).
[0032]
When the speaker unit 10B is connected, it is necessary to output sound from the speaker unit
10B. Therefore, the control unit 106a controls the mute unit 106b to release the mute of the
audio signal. Further, the control unit 106a controls the LPF 106f to pass the bass component of
the audio signal input from the signal processing unit 106d. By the above control, the low
frequency range components of the audio signal are output from the woofers W1 and W2, and
the high frequency range components of the audio signal are output from the tweeters T1 and
T2. Note that when the speaker unit 10B is connected, the terminals O1 and O2 are covered by
the connection member 10D, so external speakers can not be connected. Therefore, no sound is
output from the external speaker.
[0033]
The remote control reception unit 108 receives an operation signal transmitted by wireless such
as infrared light from the remote controller 109 (hereinafter referred to as the remote control
109). The remote control 109 includes various keys necessary for the operation of the audio
output device 1 such as a “select” key and a “decision” key. The user uses the remote
09-05-2019
9
control 109 to operate the storage and reproduction device 21 and set the presence or absence
of connection of an external speaker.
[0034]
(Description of Operation) Next, an operation of the audio output device 10 according to the first
embodiment will be described. FIG. 5 is a flowchart showing the operation of the audio output
device 10 according to the first embodiment. The tuner 101 selects a desired channel from the
broadcast signal received by the antenna (step S101). The tuner 101 demodulates the selected
broadcast signal to generate a TS (Transport Stream).
[0035]
The separation unit 104 separates a broadcast signal, SI / PSI, and the like from the TS generated
by the tuner 101 (step S102). The decoding unit 105 decodes the audio ES and the video ES
separated by the separation unit 104 to generate an audio signal and a video signal (step S103).
The separation unit 104 inputs the generated audio signal to the audio signal processing unit
106. Further, the separation unit 104 inputs the generated video signal to the display unit 10C.
[0036]
The control unit 106a of the audio signal processing unit 106 determines whether or not the
speaker unit 10B is connected (step S104). When the speaker unit 10B is not connected (No in
step S104), the control unit 106a controls the mute unit 106b to stop (mute) the output of the
audio signal (step S105). Further, the control unit 106a turns off (bypasses) the filter function of
the LPF 106f (step S106).
[0037]
When the speaker unit 10B is connected (Yes in step S104), the control unit 106a controls the
mute unit 106b to output an audio signal (cancel mute) (step S107). Further, the control unit
106a turns on (bypass release) the filter function of the LPF 106f so that the bass component of
the audio signal input from the signal processing unit 106d passes (step S108).
09-05-2019
10
[0038]
The display unit 10C and the speaker unit 10B or the external speaker output video and audio
according to the input video signal and audio signal (step S109). In the above description, the
case of selecting a broadcast signal has been described. However, in the case of viewing content
etc. reproduced by the storage and reproduction device 21, the processing is started from step
S104.
[0039]
(Comparison with Comparative Example) FIGS. 6A and 6B are diagrams showing the
configuration of a processing system of audio signals according to a comparative example. As
shown in FIG. 6A, in the comparative example, audio signals input to the speakers (in the case of
FIG. 6A, tweeters T1 and T2 and woofers W1 and W2) are amplified by a common (one) amplifier
AMP. The audio signal amplified by the amplifier AMP is branched for each speaker via a relay.
The branched audio signals are input to tweeters T1 and T2 and woofers W1 and W2 via high
pass filters HPF-A and HPF-B and low pass filters LPF-A and LPF-B, respectively.
[0040]
By outputting the audio signal through the relay, the speaker or the external speaker terminals
O3 and O4 can be switched and used. However, the relay needs to have the ability to sufficiently
satisfy the output current of AMP. Further, in FIG. 6B, AMP-A for inputting signals to each
speaker (in the case of FIG. 6B, tweeters T1 and T2 and woofers W1 and W2) and AMP-B for
external speaker terminals O3 and O4 are separately provided. . In this case, it is necessary to
switch and use the operation of these two AMP-A and AMP-B in the signal processing unit.
[0041]
The high pass filters HPF-A and HPF-B and the low pass filters LPF-A and LPF-B are analog filters
configured by a combination of a coil L and a capacitor C. The high pass filters HPF-A and HPF-B
separate and pass the high range component of the input audio signal. The low pass filters LPF-A
09-05-2019
11
and LPF-B separate and pass the bass component of the input audio signal.
[0042]
That is, in the comparative example, an LC network configured by a combination of the coil L and
the capacitor C in which the output of the amplifier AMP is disposed inside or near the speaker
(in FIG. 6A, 6B, LPF-A, LPF-B, HPF-A, HPF It separates to the band for every speaker with-B).
Specifically, the voice signal is separated into a high band (high frequency) band and a low band
(low frequency) band by the above-mentioned LC network, and among the separated voice
signals, the voice signal of the high band is sent to tweeters T1 and T2. The audio signal of the
low frequency band is input to the woofers W1 and W2.
[0043]
However, when the audio signal is separated into a high pass filter or a high band or a bass band,
phase disturbance due to the capacitor C and the coil L occurs in the vicinity of the cutoff band
(the end of the band separated by the network). As one of the methods for reducing this phase
disturbance, there is a multi-amplifier method in which an individual amplifier is provided for
each speaker to amplify an audio signal. However, even in the case of using the above-described
multi-amplifier method, applying a Linkwitz-Riley type filter represented by FIR (Finite impulse
response) to the separation of audio signals makes it possible to Rounding occurs).
[0044]
7A to 7C are diagrams showing transient characteristics when a Linkwitz-Riley filter is applied.
FIG. 7A is a diagram showing a composite waveform of woofer and tweeter. FIG. 7B is a diagram
showing the waveform of the woofer. FIG. 7C is a diagram showing a tweeter waveform. When a
Linkwitz-Riley filter is applied, as shown in FIG. 7B and FIG. 7C, the woofer and tweeter both have
rising edges in the rising of the waveform. For this reason, as shown in FIG. 7A, even in the
combined waveform of the woofer and the tweeter, a rounding occurs at the rising of the
waveform (a portion surrounded by a broken line).
[0045]
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12
On the other hand, in the audio output device 10 according to the first embodiment, a linearphase filter is used as the HPF or the LPF. For this reason, it is possible to effectively suppress
the occurrence of the rounding in the transient characteristic (the characteristic of the rising
edge) of the synthesized waveform.
[0046]
FIGS. 8A to 8C are diagrams showing transient characteristics when a filter of the Linear-Phase
Filter system is applied. FIG. 8A is a diagram showing a composite waveform of woofer and
tweeter. FIG. 8B is a diagram showing the waveform of the woofer. FIG. 8C is a diagram showing
a tweeter waveform. As shown in FIGS. 8B and 8C, it is possible to effectively suppress the
dullness at the rising of the waveform in both the woofer and the tweeter. Therefore, as shown in
FIG. 8A, even in the combined waveform of the woofer and the tweeter, it is possible to
effectively suppress the rounding at the rising of the waveform (the portion surrounded by the
broken line).
[0047]
In order to obtain sufficient blocking characteristics (attenuation characteristics), it was
necessary to increase the number of taps of the FIR. However, in recent years, digital devices
such as DSPs for voice have become more sophisticated, so it is possible to construct an FIR
having a tap number capable of obtaining sufficient blocking characteristics (attenuation
characteristics). For this reason, it became possible to use a Linear-Phase Filter as a channel
divider.
[0048]
As described above, in the audio output device 10 according to the first embodiment, the audio
signal is separated at a stage subsequent to the AMP 107 b of the amplification unit 107, one is
input to the woofer W1 and W2, and the other is input to the terminals O1 and O2. It is input.
For this reason, the amplifier (amplifier) for external speakers is not newly required. Further, the
connection of the speaker unit 10B is detected, and the audio signal input to the tweeters T1 and
T2 is muted by the mute unit 106b, and the filter processing by the LPF 106f is bypassed. As a
result, from the external speakers connected to the terminals O1 and O2, the sound not passing
09-05-2019
13
through the filter is output, and the performance (characteristics) of the external speakers can be
utilized.
[0049]
Furthermore, in the state where the speaker unit 10B is connected to the STB 10A, the terminals
O1 and O2 are covered by the connecting member 10D, so that external speakers can not be
connected. In addition, since the terminals O1 and O2 are exposed when the speaker unit 10B is
not connected to the STB 10A, an external speaker can be connected. Therefore, the speaker unit
10 b and the external speaker are not simultaneously connected, and the load on the AMP 107 b
can be effectively reduced (for example, the drive load on the AMP 107 b can be reduced).
[0050]
Furthermore, in the first embodiment, the audio signal processing unit 106 is configured by a
DSP, and a linear-phase filter is used as the high pass filter HPF 106 e and the low pass filter LPF
106 f. For this reason, it is possible to effectively suppress the occurrence of the rounding in the
transient characteristic (the characteristic of the rising edge) of the synthesized waveform. The
LC network constituting the analog filter has a limit of -18 dB / oct at the maximum, but the filter
included in the audio signal processing unit 106 according to the first embodiment will be
described with reference to FIGS. 7A to 8C. As described above, the cutoff characteristics can be
set sharply.
[0051]
For this reason, mutual interference in the vicinity of the cutoff frequency of each speaker can be
reduced. In particular, a tweeter (Tweeter) that may be damaged if a low frequency band audio
signal is input can sufficiently obtain the cutoff characteristics of the audio signal, so the usable
voice band can be broadened (the cutoff frequency setting is lowered. )can do. Also, in general,
when the cutoff characteristic (attenuation characteristic) is increased, phase undulation (rotation
of phase) in the vicinity of the cutoff frequency is increased. For this reason, there is a tendency
that the connection of the sound of each speaker in the vicinity of the cutoff frequency becomes
worse. However, in the first embodiment, since the linear-phase filter is used, it is possible to
suppress rapid phase rotation (phase change) in the vicinity of the cutoff frequency. Therefore,
the sound connection between the speakers can be effectively improved.
09-05-2019
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[0052]
(Other Embodiments) The present invention is not limited to the above embodiments as it is, and
at the implementation stage, the components can be modified and embodied without departing
from the scope of the invention. For example, in the first embodiment, although the AMP 107 b
for amplifying the audio signal input to the woofer W 1, W 2 is shared with the external speaker,
the AMP 107 a for amplifying the audio signal input to the tweeters T 1, T 2 is You may share it
with In this case, the mute unit 106b is disposed in the input system of the audio signal to the
woofer W1 and W2. Then, the control unit 106a controls the mute unit 106b and the HPF 106e
according to whether or not the speaker unit 10B is connected. The control method has been
described with reference to FIG.
[0053]
DESCRIPTION OF SYMBOLS 10 audio output apparatus 21 memory storage reproduction
apparatus 101 selective part 102 terminal 103 I / F 104 separation part 105 decoding part 106
audio signal processing part 107 amplification part 108 ... remote control receiver, 109 ... remote
controller (remote control).
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