Hybrid companding delta modulation system

Details Hybrid companding delta modulation system Hybrid companding delta modulation system

1980-05-19

1982-09-28

Swann, III, Glen R.

Pulse or digital communications

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Testing

332 11D, 375 26, H03K 1322

Patent

active

043521916

ABSTRACT:
A hybrid companding delta modulation system is an improvement of adaptive delta modulation and is particularly suitable for coding a speech signal. It employs both syllabic and instantaneous companding schemes. The syllabic compandor provides a long term step size of the quantizer which varies relatively slowly by estimating either the envelope of slope or amplitude variation of the input signal. On the other hand, the instantaneous compandor adjusts the step size instantaneously according to a predetermined control logic in response to variations of the input signal. With the hybrid companding delta modulation system the dynamic range of the system can be made as large as the range of the input signal level. The signal-to-quantization noise ratio is improved over presently known adaptive delta modulation systems. Finally, the effect of channel errors is minimized.

REFERENCES:
patent: 3569834 (1971-03-01), Debart
patent: 3727135 (1973-04-01), Holzer
patent: 3757252 (1973-09-01), Deschenes et al.
patent: 3973081 (1976-08-01), Hutchins
patent: 4042921 (1977-08-01), Smith
patent: 4215311 (1980-07-01), Kittel et al.

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