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Musical-tone signal forming apparatus for an electronic musical instrument
| Details |
Inventors: Kugisawa, Toshio;
Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho (Hamamatsu, JA)
Primary Examiner: Schaefer; Robert K.
Assistant Examiner: Miska; Vit W.
Attorney, Agent or Firm:
A musical-tone signal forming apparatus for an electronic musical instrument is characterized by the use of a musical-tone waveform setting circuit by which repeatedly at least one cycle of a musical-tone waveform is sampled at n points so the amplitude thereof at each sampling point can be compared with the amplitude thereof at the preceding sampling point and an increase signal, an equal signal, or a decrease signal is generated as a digital signal. Also employed is an envelope setting circuit in which an envelope of a musical tone is sampled at m points and the analog amount thereof at each sampling point is generated as a corresponding digital signal. An integrating circuit is used in which the digital signals of the envelope setting circuit are accumulatively added or subtracted according to the digital signals of the musical-tone waveform setting circuit. The output signal of the integrating circuit is taken out through a D-A converter as a musical-tone signal. The integrating circuit comprises full adders connected in tandem and latch circuits provided on the output side thereof. AND circuits and exclusive OR circuits are interposed between the musical-tone waveform setting circuit and the envelope setting circuit and the full adders. The musical-tone waveform setting circuit is provided at its input side with a clock pulse generator, which generates a clock pulse signal corresponding to the frequency of a musical-scale tone by use of an order pulse generator and a counter. Each of the latch circuits is operated at the descending portion of each pulse generated by the clock pulse generator. |
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DETAILED DESCRIPTION In FIG.
1, a clock pulse oscillator or generator 1 is provided which generates a clock pulse signal of a frequency corresponding to a frequency of a musical-scale tone.
The output terminal of generator 1 is connected through a first counter 2 and an order pulse generator 3 to a musical-tone waveform setting circuit 4.
The musical-tone waveform setting circuit 4 comprises a matrix circuit having n input terminals connected to output terminals 1-n of the order pulse generator 3, two output terminals 4A and 4B and n sampling portions.
Each of the sampling portions comprises two setting points.
At each sampling point of a musical-tone waveform (FIG.
2(C)), which it is desired be finally obtained, the amplitude thereof is compared with the amplitude thereof at the preceding sampling point.
INCREASE is obtained when the amplitude is larger than the preceding amplitude, EQUAL is obtained when the amplitudes are equal or DECREASE is obtained when the later amplitude is smaller.
There is obtained at the output terminals 4A and 4B a signal according to the following table:
______________________________________
Terminal:
______________________________________
4B 4A
______________________________________
INCREASE 1 1
DECREASE 0 1
EQUAL 0 0
(1)
______________________________________
If, thus, the setting points at each sampling point are set according to a desired waveform as shown, for instance, in FIG.
2(C), there are obtained, at the output terminals 4A and 4B, output signals as shown in FIGS.
2(A) and 2(B), respectively by the order pulses applied, in order, to each input terminal of the musical-tone waveform setting circuit 4.
Circuit 5 is a clock pulse oscillator or generator for envelope forming.
An output terminal thereof is connected through a second counter 6 and an order pulse generator 7 to an envelope setting circuit 8.
The envelope setting circuit 8 comprises a matrix circuit having m output terminals connected to output terminals 1-m of the order pulse generator 7, k output terminals and m sampling portions
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Audio Signal Processing 
