Analog and digital signal apparatus

Details Analog and digital signal apparatus Analog and digital signal apparatus

1982-09-07

1985-03-26

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

333 14, 381101, 381106, H04B 162

Patent

active

045077916

ABSTRACT:
Apparatus for reducing unmasked quantizing noise modulation in adapting differential digital coding systems. In the digital encoder low frequency signals are boosted in the presence of dominating high frequency signals that are controlling the quantizing step size. The decoder has complementary cutting of low frequency signals. Optionally, unmasked high frequency noise modulation is reduced by variable pre- and de-emphasis.

REFERENCES:
patent: 2606972 (1952-08-01), Scott
patent: 4072914 (1978-02-01), Haramoto et al.
patent: 4140876 (1979-02-01), Gagnon
patent: 4363006 (1982-12-01), Ishigaki et al.

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