JPS58205194A - Automatic rhythm performer - 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 automatic rhythm performance device, and more particularly to a device that produces various rhythm instrument sounds by shifting each rhythm instrument sound from a predetermined sound production timing.

Generally, an automatic rhythm performance device stores rhythm patterns for each rhythm instrument in a pattern memory, and
A desired rhythm pattern is selected by a rhythm selection signal from a rhythm selection switch, and a tempo counter driven by a tempo pulse is used as an address generator to correspond to the rhythm selected from the pattern memory. According to the read rhythm pattern, various rhythm sound source devices are controlled to generate automatic rhythm sounds.

By the way, in such a conventional automatic rhythm performance device, when there are multiple rhythm instrument sounds that are sounded at a predetermined sound generation timing, these multiple instrument sounds are sounded at the same time, so compared to a live rhythm performance, It was unnatural.

This is because, in live rhythm performance, the sound timing of each 1['J rhythm instrument sound physically shifts slightly for each instrument sound, and may also be intentionally shifted slightly depending on the type of instrument. be.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an automatic rhythm performance device that can produce various rhythm instrument sounds by shifting the timing of each rhythm instrument sound from a predetermined sound generation timing.

According to the present invention, a rhythm instrument sound memory is provided which stores waveform data corresponding to various rhythm instrument sounds, preceded by silence data of an arbitrary storage length, and the rhythm instrument sounds are stored based on the rhythm pattern read from the pattern memory. By selecting appropriate waveform data from the memory and sequentially reading out the selected waveform data, the timing of the automatic rhythm tones produced based on the waveform data is shifted as appropriate for each rhythm instrument sound. .

Further, a rhythm instrument sound memory stores a plurality of waveform data corresponding to various rhythm instrument sounds preceded by silent data of an arbitrary storage length, and a plurality of waveform data for each of the various rhythm instrument sounds. Random selection means for randomly selecting one of the waveform data for each of the various rhythm instrument sounds is provided, and appropriate waveform data is selected from the rhythm instrument sound memory based on the rhythm pattern read from the pattern memory and the output of the random selection means. At the same time, by sequentially reading out the selected waveform data, the generation timing of automatic rhythm sounds generated based on the waveform data is appropriately shifted for each rhythm instrument sound and for each generation timing.

The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an embodiment of an automatic rhythm performance device according to the present invention. In FIG. 1, a rhythm selection switch 1 is used to select the type of rhythm, and consists of a group of switches corresponding to rhythms such as march, waltz, and jazz waltz, and in this group of switches, the switch corresponding to the desired rhythm is turned on. Then, rhythm selection signals indicating the desired rhythm are output to the pattern memory 2 and the instrument name memory 3, respectively.

The pattern memory 2 is a book that stores rhythm patterns corresponding to various rhythms for automatic rhythm performance. This pattern memory 2 uses the rhythm selection signal applied from the rhythm selection switch 1 as a static address signal, and uses the tempo pulse TM of a predetermined frequency output from the tempo generator 4.
The output of the tempo counter 5 that counts P is used as a dynamic address signal, and pattern pulses based on the rhythm pattern corresponding to the rhythm selected by the rhythm selection switch 1 are sequentially read out based on the output of the tempo counter 5. In addition,
From this pattern memory 2, various rhythm instruments (for example, 8
A pattern pulse consisting of 8 bits indicating the sound generation timing of the various rhythm instruments is output.

The pattern pulse read out from the pattern memory 2 is applied to the differentiating circuit 6. The differentiating circuit 6 differentiates the input pattern pulse by a predetermined output from the channel counter 7 (for example, the output of the upper bit of the channel counter 7), forms a pulse with a width of one cycle of the channel counter 7, and sends this pulse to the multiplexer 8. In addition, the channel counter 7 outputs channel information from channel 1 to channel 8 to the multiplexer 8 and the instrument name memory 3 by counting high-speed clock pulses φ. A pulse with a width of 1 cycle and a pattern pulse to be input from 1 to 1 are input to channel color/7 or 1. This is assigned to each channel based on the channel information of the key-on pulse signal KO.
As NP, selector 9's i person select terminal S
B and address counter control circuit IO.

The output of the 8-stage, 2-bit 7-foot register 11 is added to the selector 9flA input, the output of the 7-dam data generator 12 is added to the B input, and the key-on pulse signal KONP is applied to the B input select terminal. The B input is selected only when it is applied to the SB, and otherwise the A input is selected and output to the 2-bit data transfer register 11 that is added to the selection input.

Note that the random data generation circuit 12 outputs random 2-bit data every time a high-speed clock pulse φ is input, and can be constructed from a well-known circuit using a shift register and an exclusive OR circuit. Each time a high-speed clock pulse φ is input, the 2-bit data from the selector 9 is input, and the data of each stage is shifted.
Transfer the bit data to the rhythm instrument sound memory port and selector 9.
Output to 0A input.

Accordingly, the shift register 11 takes in random 2-bit data from the random data generator circuit every time the key-on pulse signal KONP is supplied from the multiplexer 8, and outputs the key-on pulse signal KONP of the same channel again. memorize until

Rhythm instrument sound memo IJ13F1 has four chi2 pulls, and each table is further composed of first to eighth storage sections that respectively store waveform data corresponding to eight rhythm instrument sounds. Figure 2 shows this rhythm instrument sound memory 13.
An example of waveform data stored for each table and for each storage section of each table is shown. Although this waveform data is stored as digital data, it is shown here as an analog waveform for corporate convenience. Further, on each of the above-mentioned storage sections, start address STI to end address EDI, start address ST2 to end address ED2 . -.This is a storage section divided into 8 parts from the start address ST8 to the end address ED8. The same storage section of each table stores waveform data corresponding to the same rhythm instrument sound, but as shown in FIG. In each table, silent data of different storage lengths are stored from the start address of the table. Note that waveform data may be stored with different lengths within the range corresponding to the same rhythm instrument sound.

Next, we will explain the readout control of waveform data from this rhythm instrument sound memo 913 using the 6 shift register uII.
i As mentioned above, 2-bit data is output to the rhythm instrument sound memo IJ 13 every time a high-speed clock pulse φ is input. This 2-bit data is table designation data for designating a table for each storage section. Note that the relationship between the table designation data and the designation table is as shown in FIG.

Therefore, there are 4@=65536 combinations of waveform data of various rhythm instrument sounds based on the table designation data from the shift register 11. As a result, since the memory length of silent data from the start address corresponding to various rhythm instrument sounds differs for each rhythm instrument or some rhythm instruments, waveform data corresponding to various rhythm instrument sounds can be stored. When reading from each start address and generating rhythm sounds based on this waveform data, the timing of the generation of each rhythm instrument sound will be shifted.

On the other hand, addressing of the musical instrument sound memory 13 is performed by the musical instrument name memory 3, address counter control circuit 10, address counter 14, start/end address memory 15, adder 16 and comparator 17.

The instrument name memory 3Fi changes the sound source type assigned to each channel for each rhythm type, and stores instrument number information corresponding to the rhythm instrument name in a predetermined order for each rhythm. This instrument name memory 3 uses the rhythm selection signal applied from the rhythm selection switch 1 as a static address signal,
The channel information added from the channel counter 7 is used as a dynamic address signal, and the instrument number information in a predetermined order corresponding to the rhythm selected by the rhythm selection switch 1 is sequentially read out based on the output of the channel counter 7.

The instrument number information read from the instrument name memory 3 is
Added to start/end address memory 15 and digital global filter 18. Start/end address memory 15Fi The above-mentioned rhythm instrument sound memory 13
It stores the start address and end address of each storage section that stores waveform data corresponding to various rhythm instrument sounds, and indicates the instrument number information based on the instrument number information read from the instrument name memory 3. A start address ST and an end address ED of a storage section storing waveform data of rhythm instrument sounds are output. This start address ST is applied to an adder 16, and the end address ED is applied to a comparator 17.

The output of the address counter 14 is added to the other input of the adder 16. This address counter 14 consists of eight counters corresponding to each channel, and is controlled by the U address counter control circuit 10 when each counter starts counting and when it is reset. That is, based on the key-on pulse signal KONF applied from the multiplexer 8, the address counter control circuit 10 enables the counter of the address counter 14 corresponding to the channel to which the key-on pulse signal KONP is assigned to count. The countable counter is counted up by a clock pulse of a predetermined frequency, for example, a clock pulse whose period is eight times that of the high speed clock pulse φ. This address counter 1
The count values of the counters corresponding to each of the four channels are outputted to the adder 16 in a time-division manner. The adder 16 adds this counted value and the start address ST time-divisionally outputted from the start/end address memory 15, and uses this added value as an address signal for the rhythm instrument sound memory 13 and the comparator 17. Output to.

The rhythm instrument sound memory 13 reads out waveform data based on the table designation data added from the shift register 11 and the address signal added from the adder 16.

The comparator 17 compares the end address ED applied from the start/work/address memory 15 with the address signal applied from the adder 16, and when reading of the waveform data in the rhythm instrument sound memory 13 is completed, the address signal becomes the end address. When the match signal 'EQ is added to the address counter control circuit 10t1, the match signal EQ is output to the address counter control circuit 10 when the match signal 'EQ is applied to the address counter control circuit 10. , and makes the counter inactive until a key-on pulse KONP of the same channel is applied from the multiplexer 8.

In this way, each time the key-on pulse KONF is output from the multiplexer 8, the waveform data corresponding to the appropriate rhythm instrument sound is transferred from the rhythm instrument sound memory 13 (this waveform data includes silent data of an arbitrary storage length, and The memory length is changed appropriately each time the key-on pulse KONP is output).

The good data read from the rhythm instrument sound memory B is applied to the digital low-pass filter 18.

The digital low-pass filter 18c acts to remove noise components due to the sampling frequency with respect to waveform data corresponding to rhythm instrument sounds having low frequency components, for example, waveform data stored in the first storage section in FIG. , waveform data corresponding to rhythm instrument sounds having high frequency components are passed through as is. In order to identify the above waveform data, this digital low-pass filter 18Fi inputs the instrument number information from the instrument name memory 3.The digital low-pass filter 18Fi inputs the instrument number information, which is read from the rhythm instrument sound memory 13 and output via the digital low-pass filter 18 in a time-division manner. The waveform data corresponding to various rhythm instrument sounds are accumulated by an accumulator 19, and this accumulated data is converted into an analog signal by a digital/analog converter. speaker 2
2 and is pronounced here as a rhythm sound.

Note that the number of rhythm instruments and the number of tables in the rhythm instrument sound memory are not limited to this embodiment, and can be set as appropriate.

For example, the number of tables can be reduced to one. However, in this case, the storage section that stores waveform data corresponding to various rhythm instrument sounds stores silence data of different storage lengths from the start address, and then There is no need to store waveform data and no means for randomly selecting tables. In this case, the amount of deviation from the predetermined timing will always be constant for each rhythm instrument sound, which is not preferable in terms of bringing the rhythm performance closer to a live rhythm performance.

In addition, in this embodiment, the storage area of one memory is divided to store waveform data corresponding to each wandering rhythm instrument sound memory, but the present invention is not limited to this, and for each waveform data,
A memory may be provided for each table.

As explained above, according to the present invention, each rhythm instrument sound can be emitted with a shift from the predetermined sound timing for each rhythm instrument sound, so automatic rhythm performance is rich in variations similar to live rhythm performance. can be realized.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an automatic rhythm playing device according to the present invention, and FIG. 2 is an explanatory diagram showing an example of a rhythm instrument sound memory according to the present invention. 1. - Rhythm selection switch, 2 ...Pattern memory, 3.. Instrument name memory, 4.. Tempo oscillator, 5..
・Tempo counter, 6... Differentiation circuit, 7... Channel counter, 8... Multiplexer, 10... Address counter control circuit, 11... Shift register, L
- Random data generation circuit, 13... Rhythm instrument sound memory, 14... Address counter, 15... Start/end address counter, 16... Adder/unit,
17...Comparator, 18...Digital low-pass filter, 22...Shiker. Applicant's agent Takahisa Kimura

Claims (5)

[Claims] (1) A no-turn memory that stores a rhythm pattern t for each rhythm, a first reading means that selects a desired rhythm pattern from the pattern memory, and sequentially reads out the selected rhythm pattern, and an arbitrary memory length. a rhythm instrument sound memory that stores waveform data corresponding to various rhythm instrument sounds preceded by silent data; and a rhythm instrument sound memory that stores waveform data corresponding to various rhythm instrument sounds preceded by silent data; and appropriate waveforms from the rhythm instrument sound memory based on the rhythm pattern read by the first successive output means. An automatic rhythm performance device comprising second reading means for selecting data and sequentially reading out the selected waveform data. (2) The automatic rhythm performance device according to claim (1), wherein the rhythm pattern is a pattern pulse train indicating the sound generation timing of each rhythm instrument sound. (3) a pattern memory that stores a rhythm pattern for each rhythm; a first reading means that sequentially reads out the selected rhythm pattern when a desired rhythm pattern is selected from the pattern memory; a rhythm instrument sound memory that stores a plurality of waveform data corresponding to various rhythm instrument sounds preceded by silent data for each of the various rhythm instrument sounds; random selection means for randomly selecting each mIJ rhythm instrument sound; appropriate waveform data from the rhythm instrument sound memory based on the rhythm pattern read by the first reading means and the output of the random selection means; An automatic rhythm performance device comprising a second reading means for sequentially reading out the selected waveform data 1&:. (4) The automatic rhythm performance device according to claim (3), wherein the rhythm pattern is a pattern pulse train indicating sound generation timing for each rhythm instrument sound. (5) The automatic rhythm performance device according to claim (3), wherein the plurality of waveform data for each type of rhythm instrument sound stored in the rhythm instrument sound memory have different storage lengths of at least silent data.