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JPH0470098

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DESCRIPTION JPH0470098
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio apparatus such as a cassette tape recorder, and more particularly to an audio apparatus
with a bass enhancement function having a function to boost the bass of output sound. 2.
Description of the Related Art Conventionally, small-sized audio devices such as cassette tape
recorders tend to run short of deep bass, and thus various functions for enhancing the deep bass
are provided. The example will be described below. In the cassette tape recorder with radio
shown in FIG. 2, the output side of the radio receiving unit 21 and the output side of the
recording / reproducing unit 22 are connected to the input side of the graphic equalizer circuit
24 through the input switching switch 23. A variable resistor 25 is provided downstream of the
graph ink equalizer circuit 24, and the adjustment terminal of the variable resistor 25 is
connected to the input side of the amplifier 26. Further, the output side of the amplifier 26 is
connected to the headphone jack 27 via the resistor R1 and also connected to the input side of
the deep bass enhancement circuit 28. Furthermore, the output side of the heavy tone bass range
intensifying circuit 28 is connected to the speaker 31 via the main amplifier 29 and the switch
30. The switch 30 is configured to open when a headphone plug (not shown) is inserted into the
headphone jack 27 and the headphones are connected. In the above configuration, the audio
signal output from the radio receiving unit 21 or the recording / reproducing unit 22 is input to
the graph ink equalizer circuit 24 through the input switch 23, and the frequency characteristics
of each frequency band are adjusted here. After that, the volume is adjusted by the variable
resistor 25. The audio signal output from the variable resistor 25 is input to the headphone jack
27 and also input to the deep bass enhancement circuit 28, and the deep bass enhancement is
enhanced by the heavy bass enhancement circuit 28. Here, when the headphones are not
connected to the head phone jack 27, the switch 30 is closed, so that the audio signal output
from the deep bass region enhancement circuit 28 is amplified by the main amplifier 29, and
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then the switch is switched. The signal is input to the speaker 31 through the reference numeral
30 and converted into sound by the speaker 31. In addition, when the speaker 2 is connected,
when the switch 30 is opened, the connection between the main amplifier 29 and the speaker 31
is cut off, and no sound is output from the speaker 31. At this time, the audio signal from the
amplifier 26 is input to the headphones via the dophone jan 27 and is converted into audio by
the headphones.
However, in the above-described conventional configuration, when the audio signal in which the
deep bass range is enhanced by the deep bass range enhancing circuit 28 is played back with
headphones, the graph ink equalizer circuit 24 The audio signal of the second embodiment is
output to the headphone jack 27 without passing through the deep bass enhancement circuit 28.
As a result, since the headphones can not be driven by the main amplifier 29, a dedicated
amplifier 30 for driving the headphones is required, which increases the cost of the product.
Then, this invention is made in view of said situation, Comprising: Drive of a headphone and a
speaker is made common, and it aims at achieving the cost reduction of a product. According to
the present invention, there is provided a frequency characteristic adjusting means for adjusting
the frequency characteristic of an audio signal in a plurality of frequency bands in order to solve
the above problems. Deep bass enhancement means for enhancing the bass range of the audio
signal output from the frequency characteristic adjustment means, amplification means for
amplifying the audio signal output from the deep bass enhancement means, and audio signal
amplified by the amplification means And a switch that opens and closes in conjunction with the
presence or absence of the connection of the headphone to the headphone connection terminal,
for example, whether the headphone is connected to the headphone connection terminal or not
Connection of headphones is detected by the closed state of the switch or the like by the
headphone connection detection means for detecting and the headphone connection detection
means D. Attenuating by dampinging the output of the ho (J) neem for deep bass adjustment with
the above-mentioned frequency characteristic adjustment means in advance, in the bass
characteristic enhancement means of the above-mentioned bass characteristic enhancement
means And a range attenuation means. [Operation] In the above configuration, when the
headphone is not connected to the headphone connection terminal, the high frequency range
attenuation unit does not operate by detecting this by the headphone connection detection unit
such as the above switch, and the frequency characteristic adjustment unit It is possible to adjust
the increase and decrease of the bass range normally. In this case, the audio signal output from
the frequency characteristic adjusting means is enhanced in the deep bass range by the deep
bass range enhancing means, amplified by the amplifying means, and then converted into voice
by the speaker. Also, when headphones are connected to the headphone connection terminal, this
is detected by the headphone connection detection means such as the above-mentioned switch,
etc., so that the deep bass attenuation means operates, and the frequency characteristic
adjustment means The bass range of the audio signal is attenuated by cutting the output of.
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As a result, the audio signal output from the frequency characteristic adjusting means is flattened
and output as the frequency characteristic is enhanced if the deep bass region is enhanced by the
deep bass region enhancing means. In this case, the audio signal output from the deep bass
region enhancing means is amplified by the amplifying means, input to the headphone via the
headphone connection terminal, and converted into audio by the headphone. As described above,
according to the above configuration, since both the audio signal output to the speaker and the
audio signal output to the headphone via the headphone connection terminal are amplified via
the same amplification means, the speaker is driven And driving of the headphones are
performed by the amplification means, and it is not necessary to individually drive the
headphones. Also, even if the deep bass range is enhanced by the bass range attenuation means,
the audio signal output to the speaker is output from the frequency characteristic adjustment
means in a state where the bass range is attenuated. An audio signal having a flat frequency
characteristic similar to the above can be supplied to the headphone. DETAILED DESCRIPTION
OF THE PREFERRED EMBODIMENT The following will explain one embodiment applied to the
present invention or a cassette tape recorder with a radio based on FIG. As shown in FIG. 1, the
cassette tape recorder with radio according to this embodiment includes a radio receiver 1, a
recording / reproducing unit 2, an input selector switch 3, a graphic equalizer circuit 4, a switch
5, and a variable resistor. , A bass boost circuit 7, a headphone jack 8, a main amplifier 9, a
switch 10, and a speaker 11. The radio receiver 1 demodulates the received airwaves into an
audio signal and outputs it. The recording / reproducing unit 2 modulates the audio signal and
records it on a cassette tape (not shown), and demodulates the signal reproduced from the
cassette tape into an audio signal and outputs it. The input selector switch 3 switches between an
audio signal output from the radio receiver 1 and an audio signal output from the recording /
reproducing unit 2 to select an output. The graphic equalizer circuit 4 as the frequency
characteristic adjusting means is a circuit for adjusting the frequency characteristic of the audio
signal inputted through the input changeover switch 3 in a plurality of frequency bands, and
each of them is used to adjust the frequency characteristic. Holm VR,... R2 to VRa corresponding
to the frequency band are provided. When the adjustment terminal moves to the terminal a side,
these volumes VR,... R2 to VR increase the audio signal at the above frequency, while when the
adjustment terminal moves to the terminal C side, the sound in the above frequency
characteristic The signal is attenuated, and the frequency assigned in the order of the volumes
VR,... R2 to VR, is increased.
Further, the frequency assigned to the volume VR, corresponds to the frequency of the deep bass
range to be enhanced by the deep bass range enhancement circuit 7 described later. In the
volume VR, the collector of a switching transistor (hereinafter simply referred to as a transistor)
Tr is connected to the adjustment terminal, and the terminal C is connected to the emitter of the
transistor Tr. The haze of the transistor Tr is grounded via a resistor R3 even when a voltage + B
is applied via the resistor R2. Further, one end of the switch 5 is connected to a connection point
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62 between the resistor R2 and the resistor R3, and the other end of the switch 5 is grounded.
The switch 5 is closed when the headphone plug (not shown) is not inserted into the headphone
jack 8 and is opened when the headphone plug is inserted into the headphone jack 8 and
whether the headphone is connected to the headphone jack 8 It has a function as a Hen F phone
connection detecting means for detecting the Then, when the switch 5 is opened and the
connection of the headphone is detected, a voltage element B is applied to the haze so that the
adjustment terminal of the volume VR, and the terminal C are short-circuited. It is designed to
attenuate the deep bass range and has a function as a deep bass attenuation means. The variable
resistor 6 has one end connected to the output side of the graphic equalizer circuit 4 and the
other end connected to ground, and the adjustment output side or the heavy tone bass
enhancement circuit 70 input side-two connection, The volume adjustment of the audio signal
output from the equalizer circuit 4 is performed. The bass boost circuit 7 as a bass boost means
is connected at the output side to the input end of the main amplifier 9 so as to boost the bass of
the audio signal output from the variable resistor 6. ing. The output side of the main amplifier 9
in the amplification means and 5 is connected to the input terminal of the headphone jack 8 as a
headphone connection terminal via the resistor R1, and is connected to one end of the switch 10,
and the bass region enhancement circuit The audio signal output from 7 is amplified. The other
end of the switch 10 is connected to the input terminal of the speaker 11 and is closed when it is
not inserted into the jack 7 or the phone jack 8 as with the switch 5, and the headphone plug is
connected to the headphone jack 8. It is designed to open when inserted into the. Further, the
ground terminals of the hedphone jack 8 and the speaker 11 are both grounded.
In the above configuration, when the headphone is not connected to the headphone jack 8, the
switch 5 is closed because the headphone is not inserted into the headphone plug 8), and the
transistor Tr + via the HAES or SW, 2 · 5 It is grounded. As a result, the transistor Tr + is turned
off, and the adjustment terminal of the volume VR in the graphic equalizer circuit 4 is not shortcircuited with the terminal C, so that normal frequency characteristics can be adjusted. In this
case, the audio signal from the radio receiving unit 1 or the recording / reproducing unit 2 is
adjusted in frequency characteristics by the respective volumes of the graph ink equalizer circuit
4 through the input selector switch 3 and variable resistance After the volume is adjusted by the
unit 6, the deep bass range is enhanced by the bass enhancement circuit 7. Then, the audio
signal output from the bass region intensifying circuit 7 is amplified by the main amplifier 9 and
supplied to the speaker 11 through the switch 10 which is closed similarly to the switch 5, and
converted into audio by the speaker 11 In addition, when connecting to the 7 7 The switch 5 is
opened because it is inserted into the plug of the tophone or the headphone 8, and the voltage -B
is applied to the transistor Tr. As a result, the transistor Tr is turned on, the adjustment terminal
of the volume VR is short-circuited with the terminal C, and the output of the volume VR is cut
off. Therefore, although the audio signal output from the graph ink equalizer circuit 4 is the one
in which the heavy bass region is attenuated, the heavy bass region is enhanced by the heavy
bass region enhancement circuit 7, and as a result, the flat frequency characteristic is obtained.
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Become. Then, the audio signal is amplified by the main amplifier 9 and then supplied to the
headphones only via the headphone jack 8 because the switch 10 is open, and converted into
audio by the headphones. As described above, in the present embodiment, the audio signal can
be enhanced even if the deep bass region is enhanced by the deep bass region enhancement
circuit 7 by attenuating the deep bass region of the audio signal by the graph ink equalizer
circuit 4 when connecting headphones. Can be made flat. Therefore, the audio signal supplied to
the headphone 8 can be amplified by the main amplifier 9 in the same manner as the audio
signal supplied to the speaker 11, and it becomes unnecessary to provide a dedicated amplifier
for driving the headphone. Note that the present invention is not limited to the above-described
radio attached screen tape recorder, and may be a sound volume apparatus provided with a
sound recording device such as a CON-TV player.
[Effects of the Invention] As described above, the sound apparatus with bass enhancement
function according to the present invention outputs the frequency characteristic adjusting means
for adjusting the frequency characteristic of the audio signal in a plurality of frequency bands,
and the frequency characteristic adjusting means. A deep bass enhancement means for
enhancing the bass range of an audio signal, an amplification means for amplifying an audio
signal output from the deep bass enhancement means, a speaker and a headphone serving as an
output end of the audio signal amplified by the amplification means Connection terminal,
headphone connection detection means for detecting whether or not headphones are connected
to the headphone connection terminal, and-=: when the connection of headphones is detected by
the tophone connection detection means, It is configured to include a deep bass attenuation
means for attenuating an increase in the deep bass region of the audio signal by the means in the
frequency characteristic adjusting means in advance. As a result, when headphones are
connected, the bass range of the audio signal is attenuated by the bass range attenuation means,
and the bass range of the speech signal is enhanced by the rear bass range enhancement means,
so that the audio supplied to the headphones The signal has a flat frequency characteristic and
can be amplified by the amplification means in the same manner as the audio signal supplied to
the speaker. Therefore, if the present invention is adopted, the drive of the speaker and the drive
of the headphone can be made common, so that a dedicated amplifier, which was conventionally
required for the drive of the heno) phone is omitted, and the cost of the product is low. The effect
of being able to be FIG. 1 shows one embodiment of the present invention, and is a pro / album
showing the structure of the main part of a tape recorder with a radio. FIG. 2 is a block diagram
showing the configuration of the main part of a tape recorder with a radio, showing a
conventional example. 4 is a graphic equalizer circuit (frequency characteristic adjustment
means), 5 is a switch (headphone connection detection means), 7 is a deep bass enhancement
circuit (heavy bass enhancement means), 8 is a Hendhon Janok (headphone connection terminal),
9 Is a main amplifier (amplifying means), 11 is a speaker, and Tr is a switching transistor (deep
bass attenuation means). Patent applicant Sharp Corporation
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[0002]
Brief description of the drawings
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