JPS6024592A - Sound source selection circuit and use thereof - 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 to which the invention pertains] The present invention relates to a tone source number selection circuit used in electronic organ systems and the like, and a method of using the same.

[Prior art]

Conventionally, in electronic organ systems, etc., MOS:
A sound source that consists of a cell using three 7-channel transistors, and multiple cells connected in parallel! A selection circuit is used.

FIG. 1 is a circuit diagram of one example of a cell of a conventional sound source n selection circuit.

This cell is the first cell. Second. Third transistor T, e
Using Ta + Ts, the source of the first transistor Tt is grounded, the drain is connected to the sources of the second and third transistors Ts, and the second transistor Tt is grounded.
2 is connected to the first output line 1, and the drain of the third transistor T
The drain of s is connected to the second output line 2. This cell inputs a control signal SC to the gates of the first transistor T1, and the control signal SC to the gates of the second and third transistors T2.
At the gates of T, the first and second sound source signals S,
, S, and use it. When using an electronic organ etc., the first sound source signal S! A sound source signal is input in which the frequency difference between the first sound source signal S2 and the second sound source signal S2 is a perfect fifth, or a major third and a minor third.

In order to select one octave, that is, 12 tones, the sound source n selection circuit connects 12 of the above cells in parallel, attaches a load resistor to each of the first and second output lines 1.2, and connects them to the output end. do.

When the control input of one of the 12 cells of the sound source selection circuit configured in this way is selected, the sound source signal applied to the gates of the 42 transistors of that cell is output as a normal system output and a quint, respectively. They appear on output lines 1 and 2 as system outputs, respectively. If the second cell of one cell
Transistor T! When the sound source signal S input to the gate of the third transistor T is a G sound, and the sound source signal S input to the gate of the third transistor T is a G sound, a G sound and a G sound are obtained as outputs.

Thus, the conventional sound source n selection circuit uses 12 cells, with the second . Since the sound source signal was input to the gate of the third transistor, the second transistor was used as the sound source signal input line.
Four input lines are required, and the required area of the semiconductor chip increases due to the input lines.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a sound source selection circuit and a method of using the same that can eliminate the above-mentioned drawbacks, reduce the number of sound source signal input lines, and reduce the required area of a semiconductor chip when incorporated into a semiconductor chip.

[Structure of the invention]

The sound source live selection circuit of the present invention includes a first transistor whose source is grounded and whose gate receives a control signal, and a second transistor whose source is connected to the drain of the first transistor and whose drain is connected to a first output line. A transistor and a third transistor whose source is connected to the drain of the first transistor and whose drain is connected to the second output line are one cell, and the first... A plurality of the cells are multi-connected in parallel with each of the EL and second output lines in common, and the gate of the second transistor of each of the cells and the gate of the third transistor of the adjacent cell are commonly connected. A sound source signal is input, one end of a first resistor is connected to the first output line, and one end of a second resistor is connected to the second output line,
111J The other ends of the first and second resistors are commonly connected to serve as one output terminal, and the first and second output lines are respectively used as the other output terminal.

A method of using the sound source selection circuit of the present invention includes a first transistor whose source is grounded and a control signal is input to the gate, and a source which is connected to the drain of the first transistor 011 and whose drain is connected to the first output line. a third transistor whose source is connected to the drain of the first transistor and whose drain is connected to the second output line; A plurality of the cells are connected in parallel in common, and the gate of the second transistor of each cell and the gate of the third transistor of the adjacent cell are commonly connected to input a sound source signal, and One end of a first resistor is connected to the first output line, one end of a second resistor is connected to the second output line, and the other ends of each of the first and second resistors are commonly connected. A sound source signal input to any cell of the cells of the sound source group selection signal circuit configured as an output terminal, and the first and second output lines as the other output ends, and a sound source signal input to a cell adjacent to that cell. It is constructed by inputting the sound source signal to the one cell and the cell next to it, respectively, such that the frequency difference between the input sound source signal and the input sound source signal is an arbitrary value, but there is a pitch difference of one foot.

When the sound source selection circuit is used in an electronic orcanine system, the pitch difference between the sound source signal input to any cell and the sound source signal input to the cell next to that cell is made completely tautomorphic; Or a major third and a minor third.

[Explanation of Examples]

Next, embodiments of the present invention will be described using the drawings.

FIG. 2 is a circuit diagram of a first embodiment of the sound source selection circuit of the present invention.

This embodiment includes a first transistor T1 whose north end is grounded and a control signal input to its gate, and a first transistor T1 whose source is connected to the drain of the first transistor TI and whose drain is connected to the first output f111. 2 transistor 1r, the source of which is connected to the drain of the first transistor 'l'', and the drain of which is connected to the output I! of the second output line 2;
i! The third transistor Ts connected to the second The gate of transistor 1° and the third of the cell next to seven
The gates of the synchronizers T, are connected in common and the sound source signal S
■~822 is input, and the first output #j! 1, one end of the first resistor R1 is connected to the second output line 2, one end of the second resistor island is connected to the second output line 2, and the other ends of the first and second resistors R, , R, are connected. Both outputs are continuous and one output is outside, and the first
and the second output line 1.2 respectively as the other output end.
c consists of.

Next, how to use this embodiment will be explained.

As an example of explanation, let's take the leftmost cell and the cell next to it in Figure 2, Kazuhito.

A control signal 8c is input to the gate of the first transistor "f" to select a cell.The third transistor T of this cell
3, the sound source signal SSt is input as the second sound source signal.

An output corresponding to signal 11311 appears across IS2 resistor R1. The second transistor T! of this cell! The gate of and the gate 1- of the third transistor Ts of the town cell are connected in common, and the gate of (4t, i) is connected to the sound source signal 812' as the sound source signal of (4t, i).
An output corresponding to R8 appears across the first resistor R8. The opposite frequencies of the sound source im signals Stt and Sl are arbitrary values, but are set to constant values. Then, the two output lines 1 and 2
The two outputs that appear have a pitch difference of one foot.

When used in an electronic organ system, for example, if the sound source signal So is a -cC sound and the sound source signal 8tt is a G sound, a G sound will appear on the output line 1 and a G sound will appear on the output line 2. There is a perfect pitch difference between the G note and the G note. When used in an electronic organ, if the sound source signal is selected, for example, as shown in Table 1, one octave and one whole can be obtained.

As shown in FIG. 2 and Table 1, the sound source signal 81
The analysis will be performed using 1113 wires for inputting 1 to Bam.

Table 1 Conventionally, 24 wires were required, but from 7° C. the number of wires can be reduced to nearly half, making it easier to make the semiconductor chip smaller.

FIG. 3 is a circuit diagram of a second embodiment of the sound source selection circuit of the present invention.

In the first embodiment, the interval between adjacent HLs is 1/1, and the interval between adjacent HLs is 1/1, so that the interval between adjacent HLs is 1/1. They are connected in such a way that it is convenient to create a pitch difference force (major third and minor third) between the cells.Therefore, three cells are considered as a set, and the gate of the second transistor T of one cell and The gate of the third transistor Tt of the adjacent cell is commonly connected to input the same sound source signal.In this way, the sound source signal so I si
Since two wires are required for each input of s t sts l sho, the number of wires used to input the sound source signals 8t+ to S□ is 16.

This number is 3 more than the 13 wires in the first embodiment, but compared to the conventional 024 wires, the number of wires can be significantly reduced in V3, and the semiconductor goods can be made smaller. . Only 11! An effect can be obtained in that the difference in π degrees between adjacent cells can be made a major third and a minor third. The operation of the second embodiment is the same as the first embodiment.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to obtain a sound source selection circuit and its housing method that can reduce the number of sound source signal input lines and reduce the required area of the semiconductor chip when incorporated into a semiconductor chip. The effect is great.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an example of one cell of a conventional sound source selection circuit, and FIG. 2 is a circuit diagram of the first embodiment tlI of the present invention.
Figure Jh3 is a circuit diagram of a second embodiment of the present invention. 1.2...Output line, 3.Old...Common side, l(1
# iq,...Resistance, Sl * 8! #8
H~8t! -,"sound fAKM,sc...control signal,T,,TS,T,,'x"t,1°,T-...
...Transistor. Ward 1

Claims (1)

[Claims] (1) A first transistor whose source is grounded and whose gate receives a control signal; and a second transistor whose source is connected to the drain of the first transistor and whose drain is connected to the first output line. A transistor and a third transistor whose source is connected to the drain of the first transistor and whose drain is connected to the second output line are one cell, and the first
A plurality of the cells are multi-connected in parallel with the second output line in common, and the gate of the second transistor of each cell and the gate of the third transistor of the adjacent cell are commonly connected to produce a sound source. A signal is input, one end of a first resistor is connected to the first output line, one end of a second resistor is connected to the second output line, and the other end of each of the first and second resistors is connected. The ends are commonly connected to form one output end, and the first and second output lines are respectively used as the other output end! Sound source lf selection circuit with f# characteristic. '(2) A first transistor whose source is grounded and a control signal is input to its gate; a second transistor whose source is connected to the drain of the first transistor and whose drain is connected to the first output line; a third transistor connected to the drain of the first transistor and whose drain is connected to a second output line as one cell, and a plurality of the cells with each of the first and second output lines in common; are connected in parallel, the gate of the second transistor of each of the cells and the gate of the third transistor of the adjacent cell are commonly connected to input the sound source signal, and the first
One end of a first resistor is connected to the output line of the first resistor, one end of a second resistor is connected to the second output line, and the other ends of each of the first and second resistors are connected in common. A sound source signal input to an arbitrary cell of the cells of the sound source n selection circuit configured as an output terminal and the first and second output lines as the other output terminal, and a sound source signal input to a cell adjacent to that cell. The sound source signal is input to each of the cell and the adjacent cell so that the frequency difference between the sound source signal and the sound source signal is an arbitrary value but a constant pitch difference is inputted to the one cell and the adjacent cell. How to use the circuit. (3) Sound source selection according to claim (2), in which the pitch difference between the sound source signal input to any cell and the sound source signal input to the cell adjacent to that cell is a perfect fifth. How to use the circuit. (4) Claim (2) in which the pitch difference between the sound source signal input to any cell and the sound source signal input to the cell next to that cell is a major third and a minor third. How to use the sound source selection circuit described in section.