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JPH0746686

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DESCRIPTION JPH0746686
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
volume control circuit for automatically adjusting a suitable volume level for use in a
reproducing apparatus for reproducing a plurality of music sources such as cassette tapes,
compact discs and music broadcasts. is there.
[0002]
2. Description of the Related Art FIG. 4 is a block diagram showing the construction of a
reproducing apparatus having a function of reproducing a plurality of music sources such as
music and voice by cassette tape, compact disc, music broadcasting and the like. In the figure, 1
is a tuner for selecting a radio broadcast, 2 is a compact disc which is a music source in which
music and voice are recorded, 3 is a reproduction tape in which music is recorded, 4 is a
recording It is a tape for recording used when performing. Reference numeral 5 denotes a drive
mechanism for the compact disc 2, the reproduction tape 3 and the recording tape 4. A signal
switching unit 6 is a circuit for switching a signal output from the tuner 1 or the compact disc 2
or the reproduction tape 3. An electronic volume 7 changes the internal resistance and changes
the level of the output signal with respect to the input signal. A volume drive motor 8 drives the
electronic volume 7.
[0003]
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9 is a preamplifier for equalizing and amplifying the input signal, and 10 is a power amplifier. A
level detection circuit 11 detects the output of the electronic volume 7 and supplies the detected
output to the microprocessing unit 12. The micro processing unit 12 controls the volume drive
motor 8 and the drive mechanism 5 and the like. An operation panel 13 includes a volume down
key 14, a volume up key 15, and the like.
[0004]
The playback apparatus has a function of automatically adjusting the recording level only when
recording on the recording tape 4.
[0005]
SUMMARY OF THE INVENTION In the above-described reproducing apparatus, when the signals
supplied from a plurality of music sources such as a cassette tape, a compact disc and a music
broadcast are respectively reproduced, they are recorded on the cassette tape and the compact
disc There are the following problems because the level of the received signal and the level of the
received music broadcast signal are different.
That is, for example, when listening to a compact disc and then trying to listen to a cassette tape,
it was necessary to operate the volume each time because the signal levels were different.
[0006]
The present invention has been made to solve the above problems, and it is an object of the
present invention to provide a volume control circuit device capable of obtaining an output of a
desired volume level regardless of the level of a signal supplied from a music source. With the
goal.
[0007]
A volume control circuit device according to the present invention comprises a level detection
circuit for detecting the level of a signal supplied from a plurality of music sources, and
reproducing a signal supplied from the plurality of music sources. Are supplied from the plurality
of music sources on the basis of a volume memory key for setting a volume level of the user's
preference, a memory for storing the volume level set by the volume memory key, and the
volume levels stored in the memory. And volume level control means for automatically
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controlling the volume of each of the signals supplied from the plurality of music sources to the
desired volume level.
[0008]
In the volume control circuit device according to the present invention, the levels of the signals
output from the plurality of music sources are detected, and when the signals output from the
music sources are reproduced, the volume level of the volume is set to a preferred volume. The
level of the signal supplied from the music source is automatically adjusted to the level, and it is
possible to obtain the output of the set favorite volume level regardless of the level of the signal
of the music source Make it
[0009]
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of the volume adjustment circuit device of
the present embodiment. In FIG. 1, the same or corresponding parts as in FIG.
[0010]
In the figure, the level detection circuit 11 detects the output of the electronic volume 7 (volume
level control means) and detects signal levels from a plurality of music sources such as music,
voice and the like by the compact disc 2 and the reproduction tape 3 and music broadcasting. It
is detected.
Reference numeral 12a denotes a ROM included in the micro processing unit 12 (volume level
control means), which stores a program shown by the flowchart of FIG.
12 b is a RAM which the micro processing unit 12 similarly has. A volume memory key 16 is
operated by the user when setting the maximum volume level A of the desired volume.
[0011]
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Next, an operation of volume setting processing in which the volume level is automatically
adjusted will be described based on the flowchart shown in FIG. First, the volume memory key 16
for setting the volume to a desired level is operated, and it is determined whether or not the
maximum volume level A has been set (step S1). When it is determined that the volume memory
key 16 is not operated, the program address before volume setting processing is returned. When
the volume memory key 16 is operated and it is determined that the maximum volume level A
has been set, the maximum volume level A is stored in the RAM 12b of the microprocessing unit
12 (step S2).
[0012]
When the process of step S2 is completed, it is determined whether the volume down key 14 or
the volume up key 15 is pressed (step S3), and when it is determined that the volume down key
14 or the volume up key 15 is pressed, the RAM 12b The maximum volume level A stored in is
cleared and the program address before volume setting processing is returned (step S4). Also,
when it is determined that the volume down key 14 or the volume up key 15 is not pressed, the
maximum level X of the signal output from the music source at the time detected by the level
detection circuit 11 and the storage in the RAM 12b A comparison is made with a value (A.alpha.) Obtained by subtracting the adjusted minimum unit level .alpha. From the maximum
sound volume level A being processed (step S5). Then, as a result of this comparison, X = (A−α),
that is, the maximum level X of the signal output from the music source and the maximum
volume level A stored in the RAM 12 b minus the adjusted minimum unit level α When the
values (A−α) are equal, it is regarded that the maximum volume level A of the preferred volume
set by the user is satisfied with the volume level output from the not-shown speaker, and the
process returns to step S3.
[0013]
On the other hand, the comparison result in step S5 is X <(A-α), that is, the maximum level X of
the signal output from the music source subtracts the adjusted minimum unit level α from the
maximum volume level A stored in the RAM 12b. If it is smaller than the value (A-.alpha.), It is
considered that the volume level output from the speaker not shown falls below the maximum
volume level A, and the volume level output from the speaker is adjusted to the minimum unit
level .alpha. The volume drive motor 8 is controlled so as to be increased by the amount so that
the internal resistance value of the electronic volume 7 is reduced (step S6), and the process
returns to step S3.
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[0014]
On the other hand, the comparison result in step S5 is X> (A-α), that is, the maximum level X of
the signal output from the music source subtracts the adjusted minimum unit level α from the
maximum volume level A stored in the RAM 12b. If the adjustment minimum unit level α is
added to the maximum level X of the signal output from the music source and the maximum
volume level A stored in the RAM 12b when the value is larger than the value (A-α) (A + α) And
(step S7).
Then, when the comparison result is X> (A + α), that is, the maximum level X of the signal output
from the music source is larger than a value (A + α) obtained by adding the adjustment
minimum unit level α to the maximum volume level A, The volume drive motor 8 is controlled so
that the volume level output from the speaker is considered to be above the maximum volume
level A, and the volume level output from the speaker is reduced by the adjustment minimum
unit level α. Adjustment is performed so as to increase the internal resistance value of 7 (step
S8), and the process returns to step S3.
[0015]
In step S7, X <(A + α), that is, the maximum level X of the signal output from the music source is
smaller than the value (A + α) obtained by adding the adjustment minimum unit level α to the
maximum volume level A stored in the RAM. At this time, it is regarded that the volume level
output from the speaker satisfies the maximum volume level A, and the process returns to step
S3. After returning to step S3, the operations after step S3 described above are repeated.
[0016]
As a result, the maximum level X of the signal output from the music source is a value (A−α)
obtained by subtracting the adjustment minimum unit level α from the maximum volume level A
stored in the RAM, and the maximum volume level A. The level of the volume output from the
speaker is considered to satisfy the maximum volume level A when it is between the value (A +
α) obtained by adding the adjustment minimum unit level α.
[0017]
When the maximum level X of the signal output from the music source is smaller than the value
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(A-.alpha.) Obtained by subtracting the adjustment minimum unit level .alpha. From the
maximum volume level A stored in the RAM, the signal is output from the speaker It is
considered that the volume level is lower than the maximum volume level A of the desired
volume set by the user, and the electronic volume 7 is adjusted so as to raise the volume level the
volume down key 14 or volume up key for each minimum unit level α Between the value (A−α)
obtained by subtracting the adjustment minimum unit level α from the maximum sound volume
level A until the pressing of 15 or the value (A + α) obtained by adding the adjustment minimum
unit level α to the maximum sound volume level A Step by step adjustment and repeat until you
get into.
[0018]
When the maximum level X of the signal output from the music source is larger than the value (A
+ α) obtained by adding the adjustment minimum unit level α to the maximum volume level A,
the user sets the level of the volume output from the speaker The electronic volume 7 is adjusted
to lower the volume level so as to lower the maximum volume level A of the desired volume until
the volume down key 14 or the volume up key 15 is pressed for each minimum unit level α, or
Stepwise adjustment until it falls between a value (A−α) obtained by subtracting the adjustment
minimum unit level α from the maximum volume level A and a value (A + α) obtained by adding
the adjustment minimum unit level α to the maximum volume level A And repeated.
[0019]
When the electronic volume 7 is adjusted stepwise for each adjustment minimum unit level α, a
saturation characteristic may be provided such that the volume level does not change any more if
the number of times of adjustment reaches a predetermined number.
If the adjustment minimum unit α is too small, the automatic adjustment will always work, so
the change in sound volume will not be stable and it will be difficult to hear, so the above unit α
should be a suitably large value Is good.
Furthermore, the value of α may be changed by manual input.
A block diagram in that case is as shown in FIG. Reference numerals 20 and 21 denote up / down
keys for changing the setting of α.
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[0020]
As described above, according to the present invention, even when a plurality of music sources
are respectively reproduced, the output of the desired volume level can be stably obtained
without setting the volume by each volume. Be effective.
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