JPH088663A - Electronic volume expansion method - Google Patents

Abstract

(57) [Summary] [Purpose] The total number of electronic volumes installed in the radio
The purpose is to keep the price down by reducing the number of items adjusted by the electronic volume. [Structure] A switch that opens and closes in conjunction with the input side and output side of the electronic potentiometer is provided to switch input / output signals, and the setting contents of the electronic potentiometer are held and switched under the control of a microcomputer to make adjustment items. The electronic volume setting value can be set to a suitable value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic volume mounted on an electronic device.

[0002]

2. Description of the Related Art An example of the configuration of a conventional electronic volume circuit will be described with reference to FIG. First, the connection of this circuit will be described. 1 is an electronic volume, 2 is a shift register, 3 is an E ² PROM, and the electronic volume 1 and the shift register 2 are connected by a data bus 20. Four
Reference numerals -1 to 4-4 are input terminals of the electronic volume 1 to which a modulation signal, a demodulation signal and the like are input, respectively. 5-1-5
-4 is an output terminal of the electronic volume 1.

Reference numeral 6 is a clock signal input terminal for inputting to the E ² PROM 3 and the shift register 2. 7 is E ²
This is a data signal input terminal to the PROM 3 and the shift register 2, and this signal is input from a microcomputer (not shown). Reference numeral 8 is a chip select signal input terminal, and this signal is connected to the chip select input terminal of the E ² PROM 3. 9 is a data signal output terminal,
This signal is output to a microcomputer (not shown).

In this example, the electronic volume 1 has four built-in volumes, and an electronic volume is supplied via a shift register 2 and a bus line 20 by a clock input signal input from a terminal 6 and a data input signal input from a terminal 7. The four volumes in volume 1 are controlled independently. Therefore, the input terminal 4-1 of the electronic volume control 1
The analog signal inputs such as the modulation signal or the demodulated audio signal input to 4-4 are independently level-varied and output from the output terminals 5-1 to 5-4 of the electronic volume 1. The volume value of the electronic volume 1 is transferred to the E ² PROM via the data bus 20 and the shift register 2.
It is stored in 3. Although the operation has been described above, in this example, since the electronic volume 1 has only a maximum of four volumes built therein, it is necessary to provide a plurality of electronic volumes when the number of variable items is more than four. .

[0005]

In the above-mentioned prior art,
When the number of control items of the electronic volume is increased, it may be necessary to add an expensive electronic volume device, which has the disadvantage of increasing the price. In order to solve such a drawback, an object of the present invention is to increase the number of controllable items of an electronic volume without adding an electronic volume device by an inexpensive method.

[0006]

In order to achieve the above object, the present invention provides a plurality of independent switches on the input and output sides of an electronic volume, and the input and output sides corresponding to the items designated by microcomputer control. By opening and closing the switches at the same time, the electronic volume value is stored in the E ² PROM, and the value corresponding to the control item with the switch closed is called, and the electronic volume is set again. It is possible to perform switching control with individual electronic controls.

[0007]

As a result, for example, when eight items are controlled by the electronic volume, eight items are provided on the input side of the electronic volume,
If eight switches are provided on the output side, the electronic volume is used by controlling one of the pair of input side and output side switches at the same time by the microcomputer control to use the electronic volume. When not in use, the volume value is set. To E ² PR
If it is stored in the OM and the electronic volume is gradually switched to another item and used, for example, the electronic volume having only four built-in volumes can be used also for the control of eight items.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A configuration of an electronic volume circuit using an embodiment of the present invention will be described below with reference to FIG. Reference numeral 1 is an electronic volume, and in this example, four volumes are built in. 2 is a shift register, 3 is an E ² PROM, 4-1 to 4-1
4-8 are input terminals of this electronic volume circuit, 5-1 to
5-8 is an output terminal, 6 is a clock signal input terminal,
7 is a data signal input terminal of the E ² PROM 3 and the shift register 2, 8 is a chip select signal input terminal, 9 is a data signal output terminal, 10-1 to 10-8 are input side switches of the electronic volume 1 and 11-1 to 11-1. Reference numeral 11-8 is an output side switch of the electronic volume control 1, 12-1 to 12-8 are control signal input terminals of the switches 10-1 to 10-8 and 11-1 to 8 and are supplied from a microcomputer (not shown). Is entered.

The input terminal 4-1 is connected to the input of the switch 10-1, and the same applies to the input terminals 4-2 to 4-8.
Are independently connected to the inputs of the switches 10-2 to 10-8. One of the switches 10-1 to 10-8
0-1 and 10-5, 10-2 and 10-6, 10-3 and 1
The outputs of 0-7, 10-4 and 10-8 are connected to each other, and further connected to the four input terminals of the electronic volume 1.

The four outputs of the electronic volume 1 are connected to the input terminals of the switches 11-1 to 11-4,
Further, they are connected to the input terminals of the switches 11-5 to 11-8, respectively. Also, the switches 11-1 to 11-
The outputs of 8 are connected to the output terminals 5-1 to 5-8, respectively. The signal from the switch control signal input terminal 12-1 is input to the control terminals of the switches 10-1 and 11-1, and so on.
The signals from 2 to 12-8 are switches 10-2 to 10-8.
And 11-2 to 11-8.

[0011] signal from the clock input signal input terminal 6 is input to the shift register 2 and E ² PROM 3, the signal from the data signal input terminal 7 is input to the shift register 2 and E ² PROM 3. The shift register 2 is connected to the electronic volume 1 via a data bus 20.

This operation will be described below. Control items for temporary adjustment such as level adjustment or transmission power adjustment of modulated signals and demodulated audio signals that require volume control are input to the input terminals 4-1 to 4-8 independently. There is. For convenience of explanation, it is assumed that the modulation signal is input to the input terminal 4-1. Input terminal 4-
The modulation signal input to 1 is the switch 10- in the closed state.
It is input to the electronic volume 1 via 1. Electronic volume designation data from a microcomputer (not shown) is input from the microcomputer (not shown) to the electronic volume 1 via the data signal input terminal 7 through the shift register 2 and the data bus 20, and is built-in. Of the four volumes, the volume to which the modulated signal is input is written. During the adjustment, the stepwise set value of the volume is read via the data bus 20 and the value is stored in the E ² PROM 3. The level of the modulated signal input to the input terminal 4-1 is adjusted,
Since the data is output to the corresponding output terminal 5-1, the control data from the microcomputer is input through the control signal input terminal 12-1 to the input side switch 10-1 and the output side when specified in the item that controls the modulation signal. Switch 11
-1 at the same time, and control signal input terminals 12-2 to
Operate via 12-8 to open all remaining switches 10-2 to 10-8 and 11-2 to 11-8.

Similarly, for example, even when the demodulated audio signal is input to the input terminal 4-2 and output from the output terminal 5-2, only the input side switch 10-2 and the output side switch 11-2 are similarly operated. It is closed, all other switches are opened, and the level is changed by the second volume of the electronic volume 1, and the volume value is stored in the E ² PROM 3.

Based on the above operation, in order to further change the level of the fifth control item, the input side switch 10
By closing only -5 and the output side switch 11-5 at the same time, it is possible to share the first volume in the electronic volume 1, that is, the same volume as the variable level of the modulation signal.

Since the volume values of these items are all stored in the E ² PROM ³ under the control of the microcomputer, they can be read out when necessary.

[0016]

As described above, according to the present invention, at least one electronic volume can be realized without providing a plurality of expensive electronic volumes even when it is necessary to change the level of many items. The effect is great.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an electronic volume circuit using an embodiment of the present invention,

FIG. 2 is a block diagram showing a configuration of an electronic volume circuit using a conventional technique.

[Explanation of symbols]

1 electronic volume 2 shift register 3 E ² PROM 10-1 to 10-8 switch 11-1 to 11-8 switch

Claims (1)

[Claims] 1. A microcomputer, E ² PROM
(Electrically erasable re
In an electronic device equipped with an ad-only-memory) and an electronic volume, a plurality of switches that form a pair with an input and an output of the electronic volume are provided, and a switch from the pair of switches is controlled by a microcomputer. Open / close control is performed so that one of the pairs is closed at the same time and the other pair of switches are opened, and the electronic volume setting value is temporarily stored in the E ² PROM. E ² PROM the temporarily stored value of the electronic volume setting value corresponding to the switch
A method of expanding an electronic volume, characterized in that the control of a plurality of items is realized by one electronic volume by resetting from the electronic volume to the electronic volume.