System for analog-digital-analog conversion

Details System for analog-digital-analog conversion System for analog-digital-analog conversion

1987-08-10

1989-06-27

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341110, 341 77, 341 76, 341 73, 341 63, 375 28, 375 30, H03M 302

Patent

active

048433918

ABSTRACT:
The invention is applicable to delta modulation. A method of codifying the bit-stream for more efficient storage and transmission is disclosed. The number of pulses from the a-to-d converter is counted, per batch of B clock beats. The count, or tally value T of the batch, may be issued as an N-bit group, e.g. a 4-bit nibble. The order and spacing of the pulses within the batch is ignored. When the signal is rebuilt, a batch of B clock beats are counted out, T of which are pulses. One value which the nibble can take is reserved and used to indicate a period of silence, by replacing a whole frame of silent nibbles. Both a fixed frame length and a variable frame length are disclosed. For greater sensitivity, the extreme tally values may be utilized to signal a change in the gain or response of the system. A median tally value may be used to cancel the gain change.

REFERENCES:
patent: 3727005 (1973-04-01), Franaszer
patent: 3763433 (1973-10-01), Nicholas
patent: 3806806 (1974-04-01), Brolin

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