JPS60182492A - 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 Field of Industrial Application The present invention provides a method for reading out a part of the read waveform from a storage device that stores the rising part or all (the rising part and the falling part) of the musical sound waveform. The present invention relates to an electronic musical instrument that arbitrarily controls the envelope time (rise time change or total readout time) of a musical tone by removing the envelope time.

Conventional configuration and its problems Conventionally, in an electronic musical instrument, one cycle or a number of cycles of a musical sound waveform digitally displayed is stored in a memory circuit, and this is read out repeatedly at a predetermined speed and converted from digital to analog. In particular, a method of obtaining musical tones was proposed. In recent years, with advances in semiconductor integration technology, the memory capacity of semiconductor integrated circuits that make up memory circuits has increased, and they have also become cheaper. Therefore, a method of storing the rising edge or the entirety of a musical waveform and reading it out at a predetermined speed has been developed. was considered.

This method memorizes and reproduces the sounds of natural instruments as they are, resulting in musical sounds with extremely realistic tones.

A block diagram of a conventional example is shown in FIG. In Figure 1, 1
1 is a readout circuit, 12 is a storage circuit, and 13 is a digital-to-analog converter. The musical sound waveform of the rising part is stored in the memory circuit from address O to address N1, and the musical sound waveform of the steady part is stored from address N+1 to address N2t. When the musical tone starts to be produced, the readout circuit starts with the readout clock. Address 1 to Address N depending on speed
After reading up to 2, it returns to address N1+1 and repeatedly reads from address N1+1 to address N2.

This method has an excellent timbre because it stores the rising part of a musical tone as it is, which is a strong factor in determining the impression of a musical tone in terms of hearing. However, in electronic musical instruments, the memory circuit is read out using a readout clock that is proportional to the pitch of musical tones, so the rise time becomes significantly longer or shorter. For example, since a standard electronic organ has a six-octave range, there is a difference of 32 times (25) in the read clock between the highest note and the lowest note, and a difference of 32 times in rise time. In general, natural musical instrument sounds have 32
Since there is no twice as much difference in rise time, the realism of musical sounds tends to be lost in the high and low ranges. For this reason, if you memorize a standard musical sound waveform in the middle range, especially in the low range,
This had the disadvantage that the rise of musical tones was slow, and it was not possible to respond to fast keyboard operations.

Purpose of the Invention The present invention improves the realism of musical tones by arbitrarily controlling the rise time or the entire time by removing the waveform at a certain rate when reading the waveform from a memory circuit that stores the rising part or the entirety of the musical sound waveform. The purpose is to improve response in the bass range.

Structure of the Invention The present invention is composed of a first memory circuit that stores the rising part or all of the musical sound waveform, a readout circuit for reading out the memory circuit, a gate circuit, an opening/closing control circuit, and a second memory circuit. The rise time or the entire time can be controlled by removing part of the musical sound waveform.

DESCRIPTION OF EMBODIMENTS FIG. 2 shows an embodiment of the present invention. In Figure 2, 2
2 is a memory circuit that stores the rising edge of a musical waveform; 21 is a readout circuit for reading out the memory circuit; 23 is a programmable counter; 24 is a gate circuit; and 25 is a first-in-first-out memory (hereinafter referred to as F-IFO). ) 26 is a digital to analog converter. The first memory circuit corresponds to the memory circuit 22, the opening/closing control circuit corresponds to the programmable counter 23, and the second memory circuit corresponds to the FIFO 25.

The memory circuit 22 stores the rising edge of the musical waveform, and also uses one bit to store an "O" signal indicating the zero crossing point of each period of the waveform.

At the start of sound generation, the read clock φ1 is applied to the read circuit 21 via the AND gate 27. The read clock φ2 is a read clock proportional to the pitch of the musical tone, and the clock φ1 is set to a higher frequency than the clock φ2 (for example, twice the clock φ2). The reading circuit 21 sequentially reads out musical sound waveforms from address O in the memory circuit 22. The read musical sound waveform is sent to gate circuit 2.
4, it is input to PIF025 and stored. At the same time, the 0" signal read out from the memory circuit 22 is given to the programmable counter 23. The programmable counter 23 is given setting data M in advance, and every time M "○'" signals are input, a G signal is input. Output.

FIG. 3 is a time chart when M=6. ′
0” signals are M in number, that is, 1 for each cycle/period of the musical sound waveform.
A G signal with a period length is output and sent to the gate circuit 24. The gate circuit 24 prevents the musical tone waveform from being input to the FIFO by the G signal.

Therefore, one period every M periods of the musical tone waveform read out from the storage circuit is removed and stored in the FIFO. The FIFO is read out by a read clock φ2 proportional to the pitch of the musical tone, and sent to the digital-to-analog converter 26, where it is converted into an analog signal. Also FIFO2
The AND gate is closed by the FULL signal indicating that the storage data of No. 5 is full, thereby preventing over-input to the FIFO 25.

In this way, it is possible to remove one period of the waveform every M period, and if M = s, the coefficient is 80, and if M = 4, it is 761)
You can control the rise time of the musical sound waveform.

In this embodiment, after the readout circuit specifies address N2, it repeatedly reads out address N2 from address N1+1 as in the conventional example.

For musical tones consisting of a rising part and a falling part, such as a percussion sound, the entirety (rising part and falling part) is stored in a memory circuit and read out in the same way as in this embodiment. . In that case, the address designation from the readout circuit 21 may end at address N2.

Effects of the Invention The present invention comprises a first memory circuit that stores the rising part or the entirety of a musical tone waveform, a readout circuit for reading out the memory circuit, a gate circuit, an opening/closing control circuit, and a second memory circuit that temporarily stores the musical waveform. The envelope time of musical tones (
Since it controls the rise time or the entire time (rise and fall parts), it is possible to improve the realism of musical tones and the key response especially in the bass range.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional example, FIG. 2 is a 7022 diagram of an embodiment of the present invention, and FIG. 3 is a time chart in the case of M25 in this embodiment. 11...-Reading circuit, 12-...Storage circuit, 1
3... Digital-to-analog converter, 21...
Readout circuit, 22...Storage circuit, 23...
Programmable counter, 24...gate circuit,
25...FIFO126...Digital analog converter, 27...AND gate.

Claims (3)

[Claims] (1) A first storage circuit that stores a musical tone waveform, a readout circuit that reads out a musical tone waveform from the first memory circuit, and a gate circuit that controls passing or blocking of the musical tone waveform from the first memory circuit. , an opening/closing control circuit that controls opening and closing of the gate circuit at a settable rate, and a second opening/closing control circuit that temporarily stores musical sound waveforms.
An electronic musical instrument characterized in that it is equipped with a memory circuit and is capable of controlling the envelope time of a musical tone. (2) The electronic musical instrument according to claim 1, wherein the first storage circuit stores a musical sound waveform of a rising portion of a musical tone, thereby making it possible to control the rising time of a musical tone. (3) The first storage circuit stores the musical sound waveforms of the rising and falling parts of musical tones, thereby making it possible to control both the rising and falling times of musical tones.
Electronic musical instruments listed in section