JPH0160288U - - 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 detailed diagram of the interface/control unit, Figure 7 is a time chart of some of the signals generated by the timing signal generation circuit, and Figure 8 is the time chart of other signals generated by the timing signal generation circuit. Figure 9 is a detailed diagram of the timing signal generation circuit, Figure 10 is a detailed diagram of the instruction decoder, and Figure 11 is an interface diagram for a 1-byte length data transfer instruction.
A time chart showing the operation of the control unit. Figure 12 is a time chart showing the operation of the interface/control unit in response to a 2-byte data transfer instruction. Figure 13 is a time chart showing the operation of the interface/control unit in response to a flag set instruction. FIG. 14 is a time chart showing the operation of the interface/control section in response to a key-off instruction. FIG. 15 is an operation code instruction for controlling the generation of musical tones. FIG. 16 is a time chart showing the operation of the interface/control unit in response to an instruction to allocate an output line to a sound channel. FIG. 16 is a time chart showing the operation of the interface/control unit in response to a mode setting instruction. FIG. A detailed diagram of the waveform generation circuit, FIG. 18, shows the waveform generation circuit,
A waveform diagram showing a set of sine waves that are distorted by operation codes, Figure 19 is a time chart of the waveform generation circuit, Figure 20 is a detailed diagram of the OL control circuit, Figure 21 is a detailed diagram of the output register, and Figure 22 is a detailed diagram of the OL control circuit.
The figure is a time chart of the output section of the waveform generation circuit in the master sound source, FIG. 23 is a time chart of the output section of the waveform generation circuit in the slave sound source, and FIG. FIG. 25 is a configuration diagram of the sound system. 3... CPU, 6, 8... Sound source LSI, 10...
...Sound system, 15...Waveform generation circuit, 1
6...OL control circuit, 389...DAC, 390
...Analog switch.

Claims (1)

[Claims for Utility Model Registration] In an output device for an electronic musical instrument that outputs musical tones generated by a plurality of sound sources 6 and 8 that operate asynchronously to each other to an audio device 10, there is provided a device between the plurality of sound sources and the audio device. Common D/A conversion circuit means 389, 390 provided, and one of the plurality of sound sources as a master sound source, and each musical tone generated by the plurality of sound sources in accordance with a timing signal generated by the master sound source. An output device for an electronic musical instrument, comprising: time division conversion control means 16 for extracting data in a time division manner and converting it into an analog signal in the D/A conversion circuit means.