Variable speed digital reproduction system using a digital low-p

Details Variable speed digital reproduction system using a digital low-p Variable speed digital reproduction system using a digital low-p

1981-02-20

1982-12-28

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

179 1555T, 364572, H03K 1302

Patent

active

043664717

ABSTRACT:
A variable speed reproduction system includes a memory in which analog signal is stored as sampled digital data. A variable frequency digital low-pass filter is receptive of the data read out of the memory. A counter provides a binary representation of a count value of time base clock pulses to a comparator for detecting a coincidence with a variable speed setting of a variable resistor. The output of the comparator resets the counter and is used as a source of reading the data out of the memory. The cut-off frequency of the digital filter is controlled in response to the setting of the resistor so that the high frequency component of the analog equivalent of the input digital data which is higher than one-half of the data reading frequency is eliminated to prevent foldover distortion noise which might occur as a result of the difference between the recording and reproducing speeds. The data read out of the memory is fed to a digital-to-analog converter at a constant frequency and the quantum noise of the output data is filtered out by an analog low-pass filter.

REFERENCES:
patent: 3104284 (1963-09-01), French
patent: 3803358 (1974-04-01), Schirf
patent: 3982070 (1976-09-01), Flanagan
patent: 4093989 (1978-06-01), Flink
patent: 4216504 (1980-08-01), Boussina
patent: 4302776 (1981-11-01), Taylor

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