JPS6173197A - Sound signal selection circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a sound signal selection circuit used in a personal computer, etc., which effectively generates various sound signals or audio signals three-dimensionally. Ru.

[Technical Background of the Invention] In recent years, personal computers have come to be used more and more even in homes, and -In addition to the traditional 4-arithmetic functions, there is now a growing demand for musical ability. A programmable syllable generator (PSG) that generates the octagonal sound (=i) for J: da, i was also developed and incorporated into the Hersonor's engine.On the other hand, Brevi 1.: Even in Japan, devices with excellent music functions equipped with stereo input terminals are beginning to appear, and devices that combine these with a personal computer to control the screen and music with a personal computer are appearing. Under these circumstances, the capabilities required of personal computers have become increasingly sophisticated, and the traditional function of simply generating sound is no longer able to meet the demands.However, If you try to effectively generate high-level musical functions, such as a precise number of tones or epsilon voice signals, for example three-dimensionally, it will be relatively expensive and occupy a large volume.
There is a problem in that it is difficult to incorporate into a personal computer.

[Object of the Invention] The present invention has been made in view of the above, and its purpose is to generate a wide variety of sound signals effectively and economically, and to provide sound signals suitable for use in personal computers. The purpose of the present invention is to provide a selection circuit.

[Overview of the Invention] In order to achieve the above object, the present invention appropriately selects sound signals from a plurality of programmable sound generators in a signal selection circuit according to an instruction signal from an instruction circuit, and
and a second output circuit.

[Effects of the Invention] According to the present invention, the analog switch is controlled by the instruction signal from the instruction circuit, and the sound signals from the plurality of programmable sound generators are outputted in any combination from the first and second output circuits. Therefore, it is possible to generate various kinds of sound signals three-dimensionally, effectively and economically, making it suitable for personal concerts.

[Embodiment of the invention j A detailed explanation of this invention follows.

The first one shows an embodiment of the present invention.

In the same figure, the sound signal generator 1 includes, for example, three programmable sound generators (hereinafter abbreviated as PSG>11, 13, and 15).
The generated sound signal can be varied by a method not shown, and in the illustrated embodiment, different sound signals are generated. Each PSGI 1-15
Sound signal from (well, analog switch 17.19.21
．． It is supplied to a signal selection circuit 3 consisting of 23.25°27.

More specifically, the output of PSGll is supplied to the inputs of analog switches 17 and 23, the output of PSGi3 is supplied to the inputs of analog switches 19 and 25, and the output of PSGi3 is supplied to the inputs of analog switches 19 and 25;
The output of SG15 is supplied to the inputs of analog switches 21 and 27. Also, analog switch 17.1
The outputs of 9.21 are connected to each other and to an output terminal 33 via an amplifier 29 such as an operational amplifier. Here, the amplifier 29 and the output terminal 33 constitute the first output circuit 5. analog switch 23
, 25, and 27 are connected to each other and to an output terminal 35 via an amplifier 31 such as an operational amplifier. Here, the amplifier 31 and the output terminal 35 constitute the second output circuit 7.

Each of the analog switches 17 to 27 has a gate terminal, and an output signal from a register 37 constituting the instruction circuit 9 is supplied to each gate terminal. Data is supplied to the register 37 from a personal computer (not shown) via data lines 39 (6 lines in this embodiment), and this data is supplied via a control line 41. It is designed to be latched in a register 37. Furthermore, when each analog switch receives a signal 68 from the registers 37 to 11 to its gate terminal, conduction occurs between the input power and the output of the analog switch, and the sound signal from the PSG is transmitted to the output circuit. When the [OI signal is supplied to the gate terminal, the input and output are brought into a non-conducting state, and the sound signal from the PSG is not transmitted to the output circuit.

Incidentally, the output terminals 33 and 35 of the first and second output circuits 7 are normally connected to the stereo input terminals R, L, etc. of a television, and the output terminals 33+J! ：The sound signals from 1 are output from the TV's right side panel J5 and left speaker, respectively.ヱExplanation 1).

One embodiment of the present invention is configured as described above. Next, its effect will be explained.

Now, rllololj(me data) is supplied to the register 37 via three data lines, and this data is sent to the control line 41.
When the write signal is latched in the register 37 at the rising edge of the write signal, the data rl 10101J is supplied to the gate terminals of the analog switches 17 to 27, respectively. That is, the signal "1" is supplied to the goo 1 ~ terminal of the analog switch 17, the signal "1" is supplied to the gate terminal of one analog switch, and the signal "0" is supplied to the gate terminal of the analog switch 21. and a signal "1" is supplied to the gate terminal of the analog switch 23,
A signal rOJ is supplied to the gate terminal of the analog switch 25, and a signal "rOJ" is supplied to the gate terminal of the analog switch 27.
1” is supplied. As a result, analog switch 17.
19.23.27 become conductive and analog switches 21.25 become non-conductive. analog switch 17
, 19.23.27 becomes conductive, PSGI 1
The sound signals are amplified by amplifiers 29 and 31 via analog switches 17 and 23, respectively, and output from output terminals 33 and 35 to the input terminal of the television. P
The sound signal from SGl 2 is amplified by an amplifier 29 via an analog switch 19 and output to the input terminal of the TV from an output terminal 33.
The signal is amplified by an amplifier 31 via an input signal F-27, and is supplied from an output terminal 35 to an input terminal of the television. The I/P is supplied from each output terminal to the input terminal of the TV.
The sound signals from the SGs are output from the television speakers. In this case, the sound signals output from each PSG are mixed on the output side of the analog switch f-, then amplified by an amplifier and output from the output terminal.

Figure 2 shows PSG using the sound signal selection circuit shown in Figure 1.
This is a flowchart showing the effect of trying to express the sound of a train moving from right to left, for example, by outputting the sound signal generated from II to move from the right speaker to the left speaker. .

In the figure, data is first sent from the personal computer to the register 37'\rlo via three data lines.

000'' is supplied. As a result, only the analog switch f-17 becomes conductive, and the sound signal from the PSGll is passed through the ab[]g switch 17 to the amplifier 29.
supplied to The sound signal amplified by these two amplifiers is supplied from the output terminal 33 to the right speaker of the television, and is first output from this right speaker (step 110).

This indicates, for example, that a train is approaching from the right.

Next, after a slight delay on the personal computer (step 120>, the personal computer
The data looloooj is supplied to the register 37, and the analog switches 17 and 23 are turned on. As a result, the sound signal from PSGll is transmitted to the analog switch 17.
and 23 to amplifiers 29 and 31;
Further, the output terminals 33 and 35 simultaneously output from the left and right speakers of the 7-channel speaker (step 130). This indicates that a train, etc. is passing in front of you.
be. In addition, after providing a slight delay time, step 14
0), when data [000100j is supplied from the personal computer to the register 37, only the analog switch 23 becomes conductive, and the sound signal from the PSGI 1 is sent to the left switch via the amplifier 31 and the output terminal 35. (step 150). This indicates that the train was moving to the left. Similarly, after some delay time J5 (suit Tsubu 16
0>, Personal Conhif-Evening I゛○00000
'' is supplied to the register 37 to place all analog switches in the non-contact state and stop sound from the speakers (step 170).

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a sound signal selection circuit according to an embodiment of the present invention, and a flowchart illustrating the operation of the sound signal selection circuit 11 shown in FIG. 1... Sound signal generation section, 3... (a bow selection circuit, 5
．． 7... Output circuit, 9... Indication circuit, 11-15
...Programmable sound generator, 17-27...Analog switch. Figure 1 2rl: J

Claims (1)

[Claims] a plurality of programmable sound generators that can vary the generated sound signals; and a first programmable sound generator that outputs the supplied sound signals.
and a second output circuit; an instruction circuit for instructing a combination of sound signals from the plurality of programmable sound generators to be output from the first and second output circuits, respectively; A sound signal selection circuit comprising: a signal selection circuit that selects sound signals from the plurality of programmable sound generators and supplies the selected sound signals to the first and second output circuits.