JPH0746686A - Volume adjusting circuit device - Google Patents

Abstract

PURPOSE:To obtain the output of a favorite volume level regardless of a music source by storing the favorite volume level when plural music sources are reproduced and automatically adjusting the level of the reproduced signal from the music sources. CONSTITUTION:A level detection circuit 11 detects the output of electronic volume 7 and detects the signal levels from plural music sources of the music and sound, etc., by a compact disk 2, a tape 3 for reproduction or a tuner 1. When the volume memory key 16 of an operation panel 13 is operated, a maximum volume level is stored in the RAM 12b of a microprocessing unit 12. A volume driving motor 8 is controlled and a volume 7 is adjusted so that the maximum level of the output of the circuit 11 may be in a prescribed range from the level stored in the RAM 12b. When volume down/up keys 14 and 15 are depressed, the level of the RAm 12b is made clear. Therefore, a volume setting is not necessary to be performed each occasion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a volume adjusting circuit device for automatically adjusting a suitable volume level for use in a reproducing device 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 a structure of a reproducing apparatus having a function of reproducing a plurality of music sources such as music and voice by a cassette tape, a 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 playback tape in which music is recorded, and 4 is recording. It is a recording tape used when performing. Reference numeral 5 is a drive mechanism for the compact disc 2, the reproducing tape 3, and the recording tape 4. A signal switching unit 6 is a circuit for switching a signal output from the tuner 1, the compact disc 2, or the reproducing tape 3. Reference numeral 7 is an electronic volume that varies the internal resistance to vary the level of the output signal with respect to the input signal, and 8 is a volume drive motor that drives the electronic volume 7.

Reference numeral 9 is a preamplifier for equalizing and amplifying an input signal, and 10 is a power amplifier. 11 is a level detection circuit, which detects the output of the electronic volume 7,
It is a circuit that supplies the detection output to the microprocessing unit 12. Micro processing unit 12
Controls the volume drive motor 8, the drive mechanism 5, and the like. An operation panel 13 includes a volume down key 14 and a volume up key 15.

This reproducing apparatus has a function of automatically adjusting the recording level only when recording on the recording tape 4.

[0005]

In the reproducing apparatus described above, when signals supplied from a plurality of music sources such as a cassette tape, a compact disc, and a music broadcast are reproduced, the signals are recorded on the cassette tape and the compact disc. There are the following problems because the levels of the received signal and the signal of the received music broadcast are different. That is, for example, when I listened to a compact disc and then tried to listen to a cassette tape, the signal level was different, so I had to operate the volume each time.

The present invention has been made in order to solve the above problems, and a volume control circuit device that can obtain an output of a desired volume level regardless of the level of a signal supplied from a music source. Aim to get.

[0007]

A volume control circuit device according to the present invention reproduces signals supplied from a plurality of music sources, and a level detection circuit for detecting the levels of signals supplied from a plurality of music sources. A volume memory key for setting a desired volume level at the time, a memory for storing the volume level set by the volume memory key, and a plurality of music sources supplied based on the volume level stored in the memory. And a volume level control means for automatically adjusting the level of the signal to be reproduced and controlling the volume when the signals supplied from the plurality of music sources are respectively reproduced to the desired volume level.

[0008]

The volume adjusting circuit device according to the present invention detects the levels of the signals output from a plurality of music sources and reproduces the signals output from the music sources, and sets the volume level to a desired 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. To

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 control circuit device of the present embodiment. In FIG. 1, the same or corresponding parts as in FIG.

In the figure, a level detection circuit 11 detects the output of an electronic volume 7 (volume level control means) and outputs from a plurality of music sources such as compact disc 2, reproduction tape 3 and music broadcast by music broadcasting, voice, etc. The signal level is being detected. 12a is a ROM included in the microprocessing unit 12 (volume level control means)
The program shown in the flowchart of FIG. 2 is stored. Similarly, 12b is a RAM included in the microprocessing unit 12. Reference numeral 16 is a volume memory key operated by the user when setting the maximum volume level A of a desired volume.

Next, the operation of the volume setting process for automatically adjusting the volume level will be described with reference to the flow chart shown in FIG. First, the volume memory key 16 is operated to set the volume to a desired level,
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 is returned to the program address before the volume setting process. When it is determined that the maximum volume level A has been set by operating the volume memory key 16, the maximum volume level A is stored in the RAM 12b of the microprocessing unit 12 (step S).
2).

When the processing of step S2 is completed, the volume down key 14 or volume up key 15
It is determined whether or not is pressed (step S3), and the volume down key 14 or the volume up key 15 is pressed.
When it is determined that is pressed, the maximum volume level A stored in the RAM 12b is cleared and the program address before the volume setting processing is returned (step S).
4). When it is determined that the volume down key 14 or the volume up key 15 has not been pressed, the maximum level X of the signal output from the music source at the current time detected by the level detection circuit 11 is detected.
And a value (A-α) obtained by subtracting the adjustment minimum unit level α from the maximum volume level A stored in the RAM 12b (step S5). Then, as a result of this comparison, X = (A-α), that is, the adjustment minimum unit level α is subtracted from 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 values (A-α) are equal, the maximum volume level A of the desired volume set by the user is regarded as satisfying the volume level output from the speaker (not shown), and the process returns to step S3.

On the other hand, the comparison result of step S5 is X <(A
-Α), that is, when the maximum level X of the signal output from the music source is smaller than the value (A-α) obtained by subtracting the adjustment minimum unit level α from the maximum volume level A stored in the RAM 12b, The volume level output from the speaker not shown is the maximum volume level A.
The volume drive motor 8 is controlled so as to increase the level of the volume output from the speaker by the adjustment minimum unit level α, and the internal resistance value of the electronic volume 7 is adjusted to be small ( The process returns to step S6) and step S3.

On the other hand, the comparison result of step S5 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 subtracting the adjustment minimum unit level α from the maximum volume level A stored in the RAM 12b, The maximum level X of the signal output from the music source and the RAM 12
A comparison is made with a value (A + α) obtained by adding the adjustment minimum unit level α to the maximum volume level A stored in b (step S7). The comparison result is X> (A +
α), that is, 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 level of the volume output from the speaker is It is considered that the maximum volume level A is exceeded, and the volume drive motor 8 is controlled so that the volume level output from the speaker is reduced by the adjustment minimum unit level α so that the internal resistance value of the electronic volume 7 is increased. Adjustment is performed (step S8), and the process returns to step S3.

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, the volume level output from the speaker satisfies the maximum volume level A. And returns to step S3. After returning to step S3, the operations after step S3 described above are repeated.

As a result, the maximum level X of the signal output from the music source is obtained by subtracting the adjustment minimum unit level α from the maximum volume level A stored in the RAM (A
-Α) and a value (A + α) obtained by adding the adjustment minimum unit level α to the maximum volume level A, it is said that the volume level output from the speaker satisfies the maximum volume level A. It is regarded.

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.
When it is smaller, it is considered that the level of the volume output from the speaker falls below the maximum volume level A of the desired volume set by the user, and the electronic volume 7 adjusts the minimum unit level α so as to raise the volume level. Each time the volume down key 14 or the volume up key 15 is pressed, or a value obtained by subtracting the adjustment minimum unit level α from the maximum volume level A (A−α)
Then, the value is adjusted stepwise and repeated until it falls within a value (A + α) obtained by adding the adjustment minimum unit level α to the maximum volume level A.

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 level of the volume output from the speaker is set by the user. It is considered that the maximum volume level A of the desired volume set by the above is exceeded, and the electronic volume 7 adjusts the volume down key 1 for each adjustment minimum unit level α so as to lower the volume level.
4 or the volume up key 15 is pressed, or a value (A−α) obtained by subtracting the adjustment minimum unit level α from the maximum volume level A and the adjustment minimum unit level α is added to the maximum volume level A. It is adjusted step by step and repeated until it falls between the values (A + α).

When the electronic volume 7 is adjusted stepwise for each minimum adjustment unit level α, a saturation characteristic may be provided so that the volume level does not change any more when the number of adjustments reaches a predetermined number. . If the minimum adjustment unit α is too small, automatic adjustment will always work, so the change in volume will be stable.
On the contrary, since it becomes difficult to hear, it is preferable that the unit α is an appropriately large value. Further, the value of α may be changed by manual input. The block diagram in that case is as shown in FIG. Reference numerals 20 and 21 are up / down keys for changing the setting of α.

[0020]

As described above, according to the present invention, even when a plurality of music sources are reproduced, a desired volume level can be stably output without setting the volume with the volume each time. It is effective.

[Brief description of drawings]

FIG. 1 is a block diagram showing a volume adjusting circuit device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the volume adjusting circuit device according to the embodiment of the present invention.

FIG. 3 is a block diagram showing another embodiment.

FIG. 4 is a block diagram showing a configuration of a conventional reproducing device having a function of reproducing a plurality of music sources.

[Explanation of symbols]

1 Tuner 2 Compact Disc 3 Playback Tape 4 Recording Tape (Music Source) 7 Electronic Volume 11 Level Detection Circuit 12 Micro Processing Unit (Volume Level Control Means) 12b RAM 16 Volume Memory Key

Claims (1)

[Claims] 1. A level detection circuit for detecting the levels of signals supplied from a plurality of music sources, and a volume memory key for setting a desired volume level when reproducing the signals supplied from the plurality of music sources. A memory for storing the volume level set by the volume memory key, and the levels of the signals supplied from the plurality of music sources are automatically adjusted based on the volume level stored in the memory, the plurality of music sources And a volume level control means for controlling the volume of each of the signals supplied from the reproduction device to the desired volume level.