Analog and digital signal apparatus

Details Analog and digital signal apparatus Analog and digital signal apparatus

1982-05-05

1985-01-08

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

333 14, 340347AD, 381 31, 381106, H04B 1202, H03G 700

Patent

active

044930917

ABSTRACT:
In order to reduce the effect of modulation of the quantizing error (noise) by the signal in an adaptive digital audio system and to increase the dynamic range of the system, the adaptive analog to digital converter is preceded by a frequency dependent network that changes the shape of its characteristic in response to a control signal. The control signal is derived from the variable scaling factor in the adaptive converter. After transmission via a transmission channel or record/playback process, complementary operations are performed by a digital to analog converter followed by a further frequency dependent variable response network.

REFERENCES:
patent: 3026375 (1962-03-01), Graham
patent: 3729678 (1973-04-01), Glasberger et al.
patent: 3795876 (1974-03-01), Takahashi et al.
patent: 4008435 (1977-02-01), Oshima et al.
patent: 4271332 (1981-06-01), Anderson

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