POLYPHONIC MUSIC UNIT EMPLOYING DIGITAL MUSIC SYNTHESIS

摘要

Electronic polyphonic music apparatus employing digital music synthesis circuitry. A preferred embodiment of the apparatus includes three digitally-controlled tone generators (200, 300, 400) which simultaneously produce three signals of independently selected frequencies. The generators (200, 300, 400) operate in response to a tone generator controller (150) which produces digital signals for controlling the rest or off period of each of the generators and frequency control circuitry for producing digital signals for controlling the tone or frequency of each of the generators. The output of each of three tone generators is coupled to a single digitally-controlled variable attenuator bank (205) by way of multiplexer circuitry (201, 202, 203). The tone generators are controlled so that only one generator is coupled to a given attenuator at any given time. The output of the attenuator bank is connected to an audio transducer (700) through a conventional audio amplifier (600). Also disclosed is a structure bonding the circuitry in LSI format to the transducer.