Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1981-06-03
1984-08-21
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347CC, 340347M, 375 94, H03K 1302
Patent
active
044673167
ABSTRACT:
A method for effecting digital to analog conversion of PCM signals by a generalized interpolative procedure, by sampling the PCM signals at a first sampling rate and supplying each sampled word in succession to a first input of a digital adder; dividing each word at the output of the adder into a first part representing the higher value portion of the adder output word and having a length shorter than that of the adder input word, and a second part representing the lower value part of the adder output word; conducting the second part of each adder output word through a digital, nonrecursive counter feedback filter having a degree greater than one at a clock pulse rate which is an integral multiple of the sampling rate, and supplying each resulting word at the filter output to a second input of the digital adder where it is added to the stored word at the first adder input; converting the first part of each adder output word into an analog signal in a digital/analog converter having a small number of available output values; and passing the analog signal at the output of the converter through an analog lowpass filter.
REFERENCES:
patent: 3843940 (1974-10-01), Ishiguro et al.
Ritchie et al., Interpolative Digital to Analog Converter, IEEE No. 11, 11/1974.
Korte Wilhelm W.
Musmann Hans-Georg
Licentia Patent-Verwaltungs-GmbH
Sloyan T. J.
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