JPS61162091A - 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 relates to a musical tone generation means for an electronic musical instrument that electronically creates the tone of a natural musical instrument.

[Conventional technology]

Conventionally, musical tone generators have been considered that switch between a closed loop consisting of an intermediate data memory and a digital filter, and an initial waveform memory.

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[Problem to be solved by the invention] In the method of providing a low-pass filter and an all-pass filter in a closed loop and controlling the timbre and volume using their constants, the change in timbre gradually attenuates from the high range, which is a limitation rLt. All I can expect is a change in tone. For example, if you are trying to create a tone in which the low-frequency components are strong only in the attack (rise) part and quickly decay, this cannot be achieved with a configuration consisting of a low-pass filter and an all-bus filter.

[Elaborate means of solving problems]

A low-pass filter and an all-bus filter are installed in the closed loop, and in addition to controlling the timbre and envelope using their constants, there is also a waveform memory that stores the characteristic waveform in the attack part, and the attenuation characteristics in the attack part are matched. An envelope generating means for generating an envelope is provided, and the waveform data from the waveform memory is further multiplied by the envelope data from the envelope generating means so that the result can be used as an output from the closed loop or added to a part of the closed loop. [Operation] In addition to the method of providing a low-pass filter and an all-bus filter in a closed loop and controlling the timbre and volume using their constants, the waveform data of the envelope generator and the waveform data of the envelope generator are multiplied by the envelope data. By adding it to the output or adding it within a closed loop, for example, a component that rises suddenly at attack and decays suddenly,
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〔Example〕

Embodiments of the invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the invention. Switching between read data from waveform memory 1 and read data from intermediate memory 2, 11-1 changeover switch 8
Then, the data is input to the counter balancer 9, and is again written to the intermediate memory via the low-pass filter 4 and the all-bus filter 5. On the other hand, the waveform data from the waveform memory 6 and the envelope data from the envelope generator 17 are multiplied by a multiplier 8 and input to an adder 9. The calculator 9 adds the two inputs t' and calculates D/A.
K output.

The length of the intermediate memory and the number of addresses. ] is determined by the pitch of the sound. The n7y data read from a certain address in the intermediate memory 2 according to the clock passes through the low-pass filter 4 and the all-bus filter 5, and is written into the same address in the intermediate memory 2 again. Switching between the initial waveform memory 1 and the intermediate memory 2 is performed depending on the length of the intermediate memory 2 [number of addresses].

In pianos and the like, a spectrum with large peaks at around 70111g and around 180 Hz is observed when the strings are struck. These two spectra are large only at the attack, and then disappear faster than the decay of the sound. Especially in the high-pitched and mid-high range of the piano, the fundamental wave of string vibration has the same frequency:
However, the frequency of this impact sound is lower. It is difficult to reproduce such characteristics in a conventional closed loop using only a low-pass filter and an all-bus filter. 70 rIZ
To reproduce the short-time peak gold of the same wave number near e 180 H2, the waveform memory 6 and envelope generator 7 are used.
Two sets of multipliers 8 are prepared, and sine waves with different numbers of addresses are input to the waveform mesori 6.Envelope data according to the attenuation characteristics of the n1 envelope generator 7 is input. Sine waves having different wave numbers and their respective n envelopes are multiplied separately by a multiplier 8 and then added together by an adder 9.

Incidentally, FIG. 2 shows the simplest embodiment, showing details of the low-pass filter 4 of FIG. 1. It goes without saying that by increasing the number of delays and multipliers, a low-pass filter with steeper characteristics can be realized.

FIG. 8 shows details of the all-bus filter 5 of FIG. 1. This is also just one example.

〔Effect of the invention〕

As shown in the embodiment, the present invention makes it possible to add percussion sounds, etc., which are difficult to produce with a damping-type musical sound generator having a low-pass filter and an all-bus filter in the closed loop.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the entire invention. FIG. 2 shows a detailed embodiment of the low-pass filter 4 of FIG. FIG. 3 shows a detailed embodiment of the all-bus filter 5 of FIG. 10. Initial waveform memory 20. Intermediate memory 81. Changeover switch 4°, low pass filter 5°. All-pass filter 6, waveform memory 7. Envelope generator 8°. Multiplier 9, . 7 JD calculator or above Applicant Seiko Electronics Co., Ltd. Figure 1 2t; '° Theory 3 Figure 3 Procedural amendment (method) % formula % Masterpiece electronic musical instrument of Z invention 3 Person making the amendment 5 Date of amendment order 1985 April 60th: “K a r
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Claims (2)

[Claims] (1) means for reading data from an initial waveform memory and storing the data in an intermediate data memory via a digital low-pass filter and a digital all-pass filter;
In an attenuation-based musical tone generation means that can read data from an intermediate data memory and return the data to the intermediate data memory via a digital low-pass filter and a digital all-pass filter, the closed-loop means can be switched with a changeover switch. An electronic musical instrument characterized in that waveform data from a waveform memory other than the waveform memory and envelope data from an envelope generator can be multiplied and added to the output from the attenuation-based musical tone generator. (2) Claim 1, which includes a plurality of waveform memories and envelope generation means, and also includes a plurality of means for multiplying the data, and the respective multiplication results are added to the attenuation type musical tone generation means. electronic musical instruments.