| 摘要 |
A polyphonic digital synthesizer which will generate a plurality of periodic signals in real time with independent control of amplitudes. A set of digital memories are at least equal in number to the periodic signals to be produced, the address of each memory determining the frequency of a signal and the content of said memory determining at least the amplitude of said signal. Digital to analog conversion means produce positive or negative analog voltage or current steps whose amplitude is proportional to a data item read in a memory and in response to control signals. These reading and transfer of the data from the memories to the conversion means and conversion control signals are provided in accordance with the transitions of pulsed signals whose repetition frequencies are distributed over a predetermined musical range. Complex output signals can be obtained by writing data in the memories according to an additive synthesis method.
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