JPS60258593A - Electronic musical instrument - 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 The present invention relates to an electronic musical instrument having a plurality of key switches and switches for controlling various musical tones or functions.
In particular, the present invention relates to a device that simplifies the wiring between a plurality of key switches and a plurality of control switches and a predetermined device to be used.

In general, in keyboard-type electronic musical instruments such as electronic organs and electronic pianos, an important problem lies in the interconnection between the keyboard switch and the sound source circuit. A typical electronic organ has several manual keyboards, a pedal keyboard, and a bank of stop selection switches. If each keyboard and stop switch were connected to the circuit using separate connection wires, the wiring would be extremely complicated, resulting in high assembly costs and difficulty in repair and inspection. For this reason, it has been desired to simplify the wiring connections.

Incidentally, electric musical instruments such as electronic organs include circuitry that transfers tone selection information from keyboard switches to appropriate circuitry by using time division multiplexing techniques. An example of the above circuit is shown in US Pat. No. 3,610,799. An important advantage of multiplexing, as noted in the preface to the '799 patent, is that it significantly reduces the amount of electrical wiring required to transfer information from the keyboard to the organ's note selection section. It is.

Furthermore, the multiplexing device can be used to transfer information other than tone selection information. For example, another multiplexing device for transferring information from a tab switch to a control pointing circuit is described in the addendum of the above-referenced U.S. Pat. No. 3,610,799.

The multiplexing device reduces the amount of wiring that would be required if the device was not utilized. However, this reduction is accomplished by an additional multiplexing device separate from the tone selection device, making it expensive and complex.

It is an object of the present invention to provide an electronic musical instrument in which the number of wirings connecting a plurality of key switches and various musical tone control or function control switches and devices using the same is reduced, the circuit is simplified, and the cost is reduced. With the goal.

In this invention, an electronic musical instrument has a plurality of key switches and a plurality of musical tone/function control switches, and generates musical tones in response to the operation of the plurality of key switches and the plurality of musical tone/function control switches. a multiplexing means for multiplexing together the outputs of a plurality of key switches and the outputs of a plurality of musical tone/function control switches; The above object is achieved by including distribution means for distributing information regarding the key switch and information regarding the control switch to respective predetermined circuits.

The invention will now be described in detail with reference to the embodiments of the accompanying drawings.

In the key encoding device 10 of FIG. 1, the key switches to be encoded are arranged in a switch matrix circuit 11 consisting of M groups each containing N switches. These switches connect N rows of output lines 12
M by the group selection counter 13
When one of the groups is energized, only the lines corresponding to the closing (on) switches in the energized group are provided with an output (ie, a switch-on signal).

The output line 12 from the switch matrix circuit 11 is
They are sequentially scanned by line scan logic 14 in cooperation with N line selection gate circuits 15. Then each line 12
is connected to the code matrix circuit 17 via the bus 16. Line 12 conducted to code matrix circuit 17
If associated with the closing switch of the energization group in the switch matrix circuit 11, a switch-on signal is sent, and in response to this switch-on signal, the column identification designating the conductive line in the line 12 A code signal (hereinafter simply referred to as code) appears on bus bar 18. This code, together with the bus 19 output from the group selection counter 13 representing the activated group (ie the selection signal), significantly identifies the closed switch in the matrix circuit 11. This encoded key data is supplied to appropriate utilization means.

If the line conducted to code matrix circuit 17 is associated with an open (off) switch, code matrix circuit 17 will not provide a code output to bus 18.

This state of no code output means that the line scan logic 14
Then, the gate circuit 15 immediately connects the next line among the N output lines 12 to the code matrix circuit 17. Until the state where there is no code output ends, the no-code detection circuit n determines that there is no code signal on the bus 18, and based on this, it outputs a signal via the OR circuit U in order to satisfy the condition of the AND circuit 5. supply One clock pulse supplied from the clock generator A through the AND circuit 5 where the condition is satisfied causes the N-ary circular shift register to advance by one step. This causes the line selection gate circuit 15 to conduct the next subsequent matrix output line 12 to the code matrix circuit 17. Scanning of unselected keyswitches proceeds at high speed.

N-ary shift register n contains a single binary bit 1. When each subsequent stage receives these two communication signals 1, the corresponding line selection gate circuits 15 are operated in sequence. When the shift register n recirculates, the pulses are fed via the line section to the counting input of the group selection counter 13.

This increments the contents of counter 13 and thus enables selection of the next switch group in matrix circuit 11. Scanning continues such that the N output lines 12 corresponding to each switch of the newly selected group are made conductive to the code matrix circuit 17 one by one.

The group selection counter 13 is M-ary, so all switch groups of the matrix circuit 11 are repeatedly selected in sequence.

Each time the line 12 associated with the closing (on) switch is conducted to the code matrix circuit 17, a coded output is produced on the bus 18. As a result, no output is generated from the no-code detection circuit n, and the shift register n is maintained in its original state. This interrupts the scanning and makes the coded signal available to said means. A reply to the OR circuit U via line I, that is, O
Scanning continues when the ``K'' signal is given.
"Reception of the signal provides a clock pulse to shift register n, which causes the next matrix output line 12 to be scanned. The response or OK" signal is applied to bus 18.
The signal may be supplied from the delay delay circuit 31 after a predetermined period of time after the code output is generated.

In another advantageous embodiment, the reply signal may be generated by the utilization means 21, 22 after the encoded key information has been utilized.

A specific example of the key encoding device 10 is shown in FIGS. 2A and 2B. In the figure, the switch matrix circuit 11 is
N (columns) x M (rows) connected multiple switches 35-1
, 3.5 2 , . . . 35-i and a switch 35-j having a plurality of switching positions. Switch 35-
, j are considered as separate switches in the IJ circuit 11. Diode 36 connects each switch 3
It is related to 5. For example, a switch used for tone selection is operated by a keyboard or pedal key. Other switches are used for stop selection for attack and decay controls, or for other functions in electronic musical instruments.

In the specific example of FIG. 2A, M-stage circular shift register 1
3' is used in place of the counter 13 that sequentially selects M switch groups in the matrix circuit 11i. Each output stage of the register 13-1, 13-2.13-M
are group selection lines 19-1, 19-2゜...19
-M respectively. 1 of registers 13'
Only the stage has 2 signal 1, and the corresponding switch group A is selected. All remaining stages of the register 13' are 2 communication signals 0. Each time a pulse is received on the line path, the register 13' is shifted, passing the only signal 1 bit to the next stage. This selects the next switch group in the matrix circuit [1.

For example, if register stage 13-M has a single signal 1 bit, the line 19-M selecting the associated group will be at a positive voltage, and switch 35 connected to shifter 19-M will be at a positive voltage. Groups from -1 to 35-N are selected. All other group selection lines 19 except line 19-M are at ground voltage. When the next shift pulse occurs in the line path, register 13' recirculates, transferring the signal 1 bit to stage 13-1 and selecting the switch group associated with line 19-1.

The output line 12 of the matrix circuit is connected to resistors 37-1 to 3
7-N is typically biased to ground voltage.

However, if any switch in the selected group is closed, the corresponding output line 12 will be high. That is, the positive voltage level supplied from the selection stage of register 13' becomes the switch-on signal. Thus, as shown in FIG. 2A, when switch 35-2 is closed and line 19-M is selected, output line 12-2 will be at a high level and all other output lines 12 will be at a low level. Become. Of course, one or more switches in each selection group may be closed, or none of the switches may be closed.

The line selection gate circuit 15 has NAND games 15-1 to 15-N to which respective matrix output lines 12-1 to 12-N are connected to one input side.

The other input side of the Nant gate 15 is connected to each stage 27-1 to 27-N of an N-ary circular shift register n. This register also contains a single 2-signal 1 which is shifted by the generation of a pulse from the AND circuit 5. The stage of register I containing this signal 1 is the corresponding Nant gate 15
conditions are satisfied, and the conditions of other Nantes gates 15 are not satisfied.

According to this arrangement, each matrix output line 12 is connected sequentially to the code matrix circuit 17 as the bits of a single 2-signal 1 are circulated through the shift register γ. For example, at the beginning of a line scan cycle, register stage 27-1 is activated by line select gate circuit 15.
-1 is opened to connect the output line 12-1 to the input line 16-1 of the code matrix circuit. By successive shifts of the register γ, the game [5-2 to 15-N
are sequentially opened, and the corresponding output lines 12-2 to 12
-N are sequentially connected to the code matrix circuit 17. When a bit of signal 1 is fed back to stage 27-1, the same pulse applied via line 4 shifts group selection register 13', thereby causing matrix circuit 11
select the next switch group.

The code matrix circuit 17 includes diodes 38-1 to 38- which interconnect the input line 16 and the output line 18.
Consists of 1. Output line 18 is biased to a positive voltage +V through a group of resistors 39. If code matrix circuit 1
If the output line 12 conducted to 7 is associated with a switch selected and closed in the matrix circuit 11, the matrix circuit 17 provides a code output on the output lines 18-1 to 18-Q. If the selected line 12 relates to an open switch in the matrix circuit 11, lines 18-1 to 18-
All of the Q's remain high, representing the absence of code output.

If group line 19-M is selected, line 12
-1 is conducted into code matrix circuit 17, input line 16-1 remains high since the corresponding switch A-1 is open.

In this case, all of the output lines 18 remain high and no code output is generated. When gate 15-2 opens, line 16-2 is connected to corresponding switch 35-2.
Since 2 is closed, the level is low. Therefore, output line 18-2, which is connected to line 16-2 through diode 38-5, is at a low level, line 1.
8-1 and 18-Q remain high, and this combination forms the code designating the selected line 16-2. With the group identification signal on line 19-M,
The code on line 18 clearly identifies that switch 35-2 is closed.

In the embodiment of FIG. 2A, the no-code detection circuit n consists of an AND circuit n' to which line 1B is connected. line 1
If all of 8-1 to 18-Q are at a high level, this indicates a no-code state, and the output of the AND circuit n' is also at a high level. This output passes through the OR circuit U, satisfies the conditions of the AND circuit section, and supplies a clock pulse to the shift register r. This shifts the shift register n and makes the next line 12 conductive to the code matrix circuit 17. Assuming no code is again generated on line 18, the next clock pulse is applied to register τ. In this manner, scanning continues at the clock speed of the clock pulse generator section until a closed switch 35 is detected.

When detected, the line 18# code output appears and at least one of lines 18-1 through 18-Q goes low. As a result, the output of the AND circuit n' becomes low level. A response, that is, an "OK" signal is sent to the devices 21 and 22.
Alternatively, scanning is stopped until the signal is sent out from the delay circuit 31 via the line addition.

In the illustrated example, the switch group of matrix circuit 11 selected through lines 19-1 and 19-2 is associated with the first utilization device addition;
The switches selected by lines 19-5 to 19-5 are used for the second device 21, and the switches selected by lines 19-6 to 19-M are used for controlling the third device n. FIG. 2B shows an example of the arrangement of gate circuits for supplying encoded signals from the key encoding device 10 to each user device ~η.

Group selection lines 19-1 and 19-2 are OR circuits 4
0, respectively, to generate a gating signal on line 41 when either of the first two groups is being scanned in matrix circuit 11.

This gate signal opens the AND circuit group 42 and connects the code feed lines 18-1 to 18-Q and the group designation lines 19-1 and 19-2 to the first user device. Similarly, group selection lines 19-8 to 19
-5 is selected, the line 4 is connected to the OR circuit 45 connected to the lines 19-8 to 19-5.
4, the multi-output AND circuit group 43 is opened. This AND circuit group 43 supplies the code signal on line 18 and the group designation signal on lines 19-3 to 19-5 to the second utilization device. The AND circuit group 46, which is opened by the signal on the line 47 supplied via the OR circuit 48, is connected to the group selection lines 19-6 to 19-M.
When one of them is selected, an encoded output is supplied to the third utilization device η.

When the encoded output is supplied to the first usage device,
A reply or 'OK' signal is sent out by the delay circuit 31. During this time, the group selection line 19-
When either 1 or 19-2 is selected, the resulting signal on line 41 also causes AND circuit I to open. When a code output is generated on line 18, an output is generated from NAND circuit 51. This output is supplied to the delay circuit 31 via an AND circuit. At the end of the delay time, the circuit 31 sends out an OK'' signal on line (9).

The key-encoding device 10 of the present invention may be used with any type of utilization device, but in particular with a keyboard electronic musical instrument of the type described by Deutsch in JP-A-48-90217 ``Electronic Musical Instruments''. Useful. In this electronic musical instrument, the fundamental frequency of each musical tone generated is determined by a frequency number selected from a frequency number storage device. The timbre of a musical tone is determined by a combination of pre-stored harmonic coefficients, each coefficient determining the amplitude associated with the Fourier components making up the generated musical waveform. Several combinations of such harmonic components may be individually stored and made available for selection by a stop selection switch. Attack and decay are performed digitally by systematically varying the amplitude values of the Fourier components constructed in successive sound generation cycles.

When the keycoding device 10 is used in such a computer organ, the first user device side is provided with attack and decay control elements, the second user device 21 is provided with a stop selection circuit, and the eighth user device side is provided with a stop selection circuit. η may consist of a sound generation circuit. In such a configuration, the switch groups selected by lines 19-6 to 19-M are manual and petal keyboard switches for preselection.

The encoded signal supplied to the sound generation circuit B via the gate circuit A is used to recall the corresponding frequency number from the memory. During this time, the coded signal supplied through the gate circuit directly becomes the frequency number memory address of the selected tone. Similarly, attack, decay control switches and stop selection switches are included in matrix circuit 11 and lines 19-1, 19-
2 and 19-8 to 19-5 individually.

As explained above, according to the present invention, it is possible to significantly reduce the wiring between a plurality of key switches and various control switches and devices using the same, thereby simplifying the circuit and reducing costs. I can do it.

[Brief explanation of the drawing]

FIG. 1 is an electrical block diagram showing one embodiment of the key switch scanning and encoding device according to the present invention, and FIGS. 2A and 2B are schematic electrical circuit diagrams showing specific examples of the circuits of each part in FIG. 1. DESCRIPTION OF SYMBOLS 10... Key encoding device, 11... Switch matrix circuit, 13... Group selection counter, 14...
... Line scanning logic, 15... Line selection gate circuit, 17... Code matrix circuit, addition ~ η...
Utilizing device: n... N-ary shift register.

Claims (1)

[Claims] An electronic device that has a plurality of key switches and a plurality of musical tone/function control switches, and generates musical tone in response to the operation of the plurality of key switches and the plurality of musical tone/function control switches. In the musical instrument, a multiplexing means for multiplexing together the outputs of the plurality of key switches and the outputs of the plurality of tone/function control switches; and inputting the signal multiplexed by the multiplexing means; An electronic musical instrument comprising distribution means for distributing information regarding the key switch and information regarding the control switch included in the signal to respective predetermined circuits.