PCM data throttle

Details PCM data throttle PCM data throttle

1977-08-30

1978-12-12

Stewart, David L.

179 15AW, H04J 318

Patent

active

041297512

ABSTRACT:
A data throttling arrangement is advantageously incorporated in a pulse width modulated (PWM) to pulse code modulated (PCM) signal converter for controlling the output rate of the PCM data stream. PWM data is converted to PCM data and stored in a memory. New PCM data is received and compared with the stored PCM data. The difference between the stored and the new PCM data is compared to a preselected threshold value. If the difference between the new and stored data is greater than the threshold value, the new PCM data is permitted to output; otherwise, the new data is disregarded as redundant or insignificant. Circuitry is provided to adjust the values of incoming PCM data by comparing it to predetermined zero offset values. Additional circuitry is provided to permit adjustment of the preselected threshold values in response to the rate of the PCM output data stream.

REFERENCES:
patent: 3588364 (1971-06-01), Wallingford
patent: 3927268 (1975-12-01), Sciulli

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