JPH0160291U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of an electronic musical instrument according to an embodiment of the present invention, Fig. 2 is a block diagram of the sound source LSI, and Fig. 3 is an external structure of the sound source LSI's interface/control section and envelope/key code generation circuit. R.A.
Time chart showing allocation of M occupancy, Figure 4 is C
A time chart of data and write control signals sent from the PU to the interface/control unit of the sound source LSI. Figure 5 is a time chart showing the low-speed calculation cycle for generating musical tone control signals and the high-speed calculation cycle for waveform generation. Figure 6 is a time chart of various timing signals generated by the timing signal generation circuit.
Fig. 7 is a block diagram of the envelope/key code generation circuit, Fig. 8 is a time chart of counter B, Fig. 9 is a flow chart showing the operation of the envelope/key code generation circuit, and Fig. 10 is a timing signal generation for calculation. Detailed diagram of the circuit, Figure 11 is a detailed diagram of the index conversion control circuit, Figure 12 is a block diagram of the index conversion/phase angle generation circuit, Figure 13 is a detailed diagram of the index conversion circuit, and Figure 14 is the index conversion circuit. Figure 15 is a detailed diagram of the envelope interpolation circuit, Figure 16 is a detailed diagram of the envelope V register, Figure 17 is a time chart of the envelope interpolation circuit, Figure 18 is a detailed diagram of the envelope D register, and Figure 19 is a detailed diagram of the envelope interpolation circuit. The figure shows a comparison of the envelope before interpolation and the envelope after interpolation, and FIG. 20 is a detailed diagram of the frequency information register. 12...Envelope/key code generation circuit,
13... Index conversion/phase angle generation circuit, 15... Waveform generation circuit, 76... Index conversion circuit, 77... Envelope interpolation circuit.

Claims (1)

[Claims for Utility Model Registration] (1) Musical tone control signal generation circuit means 12 having a general-purpose structure that generates a low-speed musical tone control signal by sequentially performing calculations, and generating a musical sound waveform based on the high-speed musical tone control signal. A musical tone synthesizing device comprising: a waveform generating circuit means 15 for generating the low-speed musical tone control signal; and an interpolating circuit means 13, 77 for closely interpolating samples before and after the low-speed musical tone control signal and converting the same into the high-speed musical tone control signal. (2) In the musical tone synthesis device according to claim 1 of the utility model registration claim, the musical tone control signal generation circuit means generates the low-speed musical tone control signal as linear data, and the linear data is stored in the interpolation circuit means. A musical tone synthesis device characterized in that it includes an index conversion circuit means 76 for performing index conversion, and interpolation is performed on the index-converted data.