JPS6222159B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multiple-tone electronic musical instrument that uses digital technology to preferentially generate a desired number of high-pitched or low-pitched tones.

Conventionally, in order to generate multiple tones in a monophonic musical instrument such as a synthesizer, a high/low tone priority selection circuit is used. The present applicant has constructed a priority selection circuit for two high and low tones by using a digital circuit to control serial data from a key data generation circuit using a counter and a latch circuit, etc., in accordance with Japanese Patent Application No. 160597/1983. suggested something. Further, in Japanese Patent Application Nos. 53-13332 and 1987-137618, we proposed a multitone electronic musical instrument that uses digital technology to preferentially generate a desired number of tones of three or more. In these proposed circuits, for example, in the case of a three-note bass priority circuit, even if four or more keys are pressed, the key information for the first three notes is stored in three memory circuits, and the keys pressed later are ignored. It will be done. In this case, if the last key pressed has a lower pitch than the previous three keys, a higher pitched sound will be generated, which is different from what the performer intended, giving a strange feeling.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multitone electronic musical instrument that uses digital technology to preferentially emit a desired number of tones in the high or low range.

In order to achieve the above object, the multitone electronic musical instrument of the present invention converts the output clock pulse of the clock pulse generator into a time-division pulse, scans each key sequentially from the bass (or treble) side, and presses the time-division signal of the pressed key. a key data generation circuit that outputs a key signal; a counter that counts the output clock pulses of the clock pulse generator; and N memory circuits that write and store the count value of the counter using the key press signal as a write signal; A compound tone comprising: a comparison circuit that compares the contents of a storage circuit with a counted value of the counter; and means for guiding an output signal of the comparison circuit to a musical sound waveform forming circuit that converts the contents of the storage circuit into a musical tone. In the electronic musical instrument, a counting circuit is provided which outputs a control signal when the number of key press signals from the key data generation circuit in one scan of each key exceeds N, and the control signal of the counting circuit causes the number of key presses to exceed N. A means for blocking the passage of key press signals is provided, and even when N or more keys are pressed,
This is characterized in that only N musical tones on the low (or high temperature) side are generated.

The present invention will be described in detail below with reference to examples.

The figure is an explanatory diagram showing the configuration of an embodiment of the present invention. This figure shows the application of the present invention to the example proposed in the aforementioned Japanese Patent Application No. 53-137618.

To outline the configuration of the above proposed example, the number of keyboards can be
It has 61 keys and produces 3 tones. In the figure, a basic clock from a clock pulse generation circuit 11 is inputted to a key data generation circuit 12 via a frequency divider 10, and 61 keys are sequentially scanned and serial data (SD )2 and outputs 1 every scanning time.
A one-scan synchronizing pulse 3 is output.
Also, the clock pulse 1 from the frequency divider 10 is input into a counter 13 and counted. In the case of 61 keys, this counter 13 is used to count 2 ⁶ =64 keys.

Next, circuits 30 ₁ , 30 ₂ , 30 ₃ shown surrounded by broken lines in the figure are provided corresponding to the three tones. These same circuits are connected in parallel to store a desired plurality of tones and send them to the tone waveform forming circuit 25. The circuit ₃₀₁ will be described as a representative example.

The signal of the counter 13 mentioned above is input to the memory circuit 14 ₁ , is stored by a read signal from the AND circuit 19 ₁ described later, is D/A converted by the D/A converter 16 ₁ , and is opened/closed by the gate circuit 17 ₁ . The signal is input to the musical sound waveform forming circuit 25. The output of the memory circuit 14 ₁ is transmitted to the memory circuits 14 ₂ of other circuits,
14 ₃ along with the data multiplexer 31
input and multiple processing. That is, the output of the counter 23 that operates based on the basic clock is sent to the decoder 24.
The outputs 6 ₁ , 6 ₂ , 6 ₃ are sequentially scanned as high level, and the selected output is sent to the comparison circuit 3
2 and compare it with the output of the counter 13, and send the matching signal to the inverter circuit 21 and each AND circuit 20 ₁ ', 2
0 ₁ ″, etc. Through this AND20 ₁ ′, 20 ₁ ″, outputs 6 ₁ to 6 ₃ and serial data 2 are respectively output.
The output synchronized with the key press detection circuit 181 is input to the reset (R) terminal of the key press detection circuit ₁₈₁ . The key press detection circuit ₁₈₁ consists of, for example, a shift register with Q ₀ and Q ₁ outputs, and a 1-scan synchronization pulse 3 is input to its clock (C) terminal.
If the output of ₁ ″ remains at a low level during one scan period, 1
At the second scan synchronization pulse 3, the _Q1 output becomes high level, turns off (cuts off) the gate circuit ₁₇₁ , and is not output. AND circuit 20 due to the coincidence signal mentioned above.
If the output of ₁ ″ goes to high level during one scan time, 1
Even if the _Q0 output becomes high level due to the scan synchronization pulse 3, it is reset, so the _Q1 output 5 continues to maintain a low level, and the gate circuit ₁₇₁ is turned on to send the D/A converted signal to the musical waveform forming circuit. Send on 25th. Then, the low level _Q1 output is branched and inputted to the AND circuit ₁₉₁ which synchronizes the serial data 2 with the scanning signals ₆₁ to _63, and the memory circuit 1
4 Turn off the read signal in ₁ to prevent malfunction.

On the other hand, the other match signal from the comparison circuit 32 is input to the AND circuit 22 along with the serial data SD2 via the inverter circuit 21, and outputs a low level "0". This stops the operation of the counter 23. Now, when the next key press signal is output from the key data generation circuit 12 and the counter 13 changes to the next state, the output of the comparison circuit 32 becomes a low level "0". Then, a counter operates via the inverter 21 and the AND circuit 22, and the outputs 6 ₁ to 6 ₃ of the decoder 24 scan the memory circuits 14 ₁ to 14 ₃ to find a location where the data can be stored. Since the signal from the decoder 24 is input to the multiplexer 31, the memory circuits 14 ₁ to 14 scanned by the decoder 24
₃ is output to the comparison circuit 32. If they match, open the gate circuit of the circuit as described above,
The contents of the memory circuit are sent to the tone waveform forming circuit 25.

The above is an outline of the proposed example, and although three sounds were used as an example, it can be similarly applied to multiple sounds. For example, if three notes are specified, even if four or more keys are pressed, the first three keys will be selected preferentially and the others will be ignored.

Therefore, as an additional circuit of the present invention, as shown in the figure, the serial data 2 from the key data generation circuit 12 is inputted to one side of the gate 42, and the input is branched and inputted to the counting circuit 41. 1 scanning synchronizing pulse 3, and the output is input to the other gate 42 via an inverter. The counting circuit 41 consists of a counter, a shift register, etc., and starts counting by resetting the 1-scan synchronization pulse 3, outputs a low level until the third input pulse, and outputs a high level when the fourth pulse is input. is set to output.

In other words, when playing with keys pressed within 3 keys,
Since the output of the counting circuit 41 is a low level and is changed to a high level by the inverter, the output of the key data generating circuit 12 is stored as it is in each memory circuit of the circuits 30 ₁ to 30 _{3 and} sent to the tone waveform forming circuit 25 .

If four or more keys are pressed, the fourth pulse is input to the counting circuit 41 during the scanning time reset by the 1-scan synchronization pulse 3, and a high level is output. Since the signal reaches the level, the AND circuit 42 is turned off, and the fourth and higher pulses of the key data generation circuit 12 are ignored. In this case, since the four keys are arranged in pitch order, the time-division output signal of the key data generation circuit 12 is output from the counting circuit 12 regardless of the order of key presses.
1, the highest (low) note is excluded and only the sounds of the three keys on the low (high) side are preferentially transmitted to the circuit 30 ₁ to 30 ₃
sent to.

For example, for a bass priority circuit, first C ₃ ,
If you press the key for the three notes E ₃ and G ₃ and then press the key for the _second note G, the function of the counting circuit 41 described above will cause the numbers G ₂ ,
The fourth G 3 among C ₃ , E ₃ , _and G ₃ is ignored, and G ₂ ,
Three tones C ₃ and E ₃ are sent to circuits 30 ₁ to 30 ₃ . Since each memory circuit stores the three tones C ₃ , E ₃ , and G ₃ , the operation of the proposed example described above allows C ₃ ,
Since E ₃ matches the input data, it will continue to be stored, but since there is no match for the G ₃ sound, the G ₂ sound will be loaded into this memory circuit.
A new combined signal of G ₂ , C ₃ , and E ₃ is sent to the tone waveform forming circuit 25 . On the other hand, instead of G ₂ note, G ₃
When the treble side of the note, for example the _G4 note, is pressed,
No change occurs in the original pronunciation of C ₃ , E ₃ , and G ₃ . In this way, the bass priority sound is always selected. That is, while the proposed example selects a predetermined number of tones in the order of key presses, the additional circuit of the present invention selects a predetermined number of tones in the order of pitches; in other words, it can be called a priority conversion circuit.

As explained above, according to the present invention, there is provided a counting circuit that generates an output signal after counting the number of time-division key press signals from the key data generation circuit to a desired value, and the output signal of the counting circuit By controlling the passage of time-division key press signals through the key data generation circuit, as mentioned above, it is now possible to select a predetermined number of notes in pitch order, whereas previously it was possible to select a predetermined number of notes only in the order of key presses. Matches treble priority,
Even when a performer presses a key exceeding a predetermined number of notes, it is possible to obtain almost the intended sound. Furthermore, the present invention is generally regarded as a priority conversion circuit that converts the priority order from the order of key presses to the order of pitches, and may be applied to other fields.

[Brief explanation of the drawing]

The figure is an explanatory diagram showing the configuration of an embodiment of the present invention. In the figure, 10 is a frequency divider, 11 is a clock pulse generation circuit, 12 is a key data generation circuit, 13, 23
is a counter, 14 ₁ to 14 ₃ are memory circuits, 16 ₁
is a D/A converter, 17 ₁ is a gate circuit, 18 ₁ is a key press detection circuit, 19 ₁ , 20 ₁ ′, 20 ₁ ″, 22,
42 is an AND circuit, 21 is an inverter, 24 is a decoder, 25 is a tone waveform forming circuit, 31 is a data multiplexer, 32 is a comparison circuit, and 41 is a counting circuit.

Claims (1)

[Claims] 1. Key data that converts the output clock pulse of a clock pulse generator into a time-division pulse, sequentially scans each key from the low (or treble) side, and outputs a time-division signal of a key press as a key press signal. a generating circuit 12; a counter 13 that counts the output clock pulses of the clock pulse generator; and N memory circuits 1 that write and store the counted value of the counter 13 using the key press signal as a write signal.
4, a comparison circuit 32 that compares the contents of each storage circuit 14 and the counted value of the counter 13, and a musical waveform forming unit that converts the contents of the storage circuit 14 into a musical tone based on the output signal of the comparison circuit 32. means 16, 17, 18 leading to the circuit 25, and outputting a control signal when the number of key press signals from the key data generation circuit 12 exceeds N within one scan of each key. A counting circuit 41 is provided, and a means 42 for blocking N or more key press signals from passing through by means of a control signal from the counting circuit 41 is provided, so that a low tone (or high tone) is generated even in response to N or more key presses. A multitone electronic musical instrument characterized by generating only N musical tones on the side.