Music – Instruments
Patent
1988-10-03
1989-06-27
Witkowski, Stanley J.
Music
Instruments
84 116, 84 128, 84DIG10, G10H 318, G10H 700
Patent
active
048418277
ABSTRACT:
An input waveform signal is converted into a digital peak value signal by an A/D converter, and the digital peak value signal is input to one input terminal A of a comparator. The other input terminal B of the comparator receives a preset digital peak value signal from a memory. These input signals are compared by the comparator. The content of the memory is reduced at a predetermined rate. If the comparator detects that the currently input waveform level is larger than the continuously reduced level of the memory, i.e., if A>B, a new waveform level is loaded in the memory. As a result, the output from the comparator is inverted. That is, condition A>B is changed into condition A<B. The timing of this change in condition serves as a peak timing of the input waveform signal.
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patent: 4785706 (1988-11-01), Toshifumi
patent: 4785707 (1988-11-01), Suzuki
Casio Computer Co. Ltd.
Witkowski Stanley J.
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