4800 BPS interoperable relp system

Details 4800 BPS interoperable relp system 4800 BPS interoperable relp system

1984-09-17

1988-05-03

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

G10L 500

Patent

active

047425504

ABSTRACT:
An apparatus and method is disclosed of providing higher quality speech transmission and reproduction. The present invention consists of a standard 2400 BPS transmitter with the addition of an additional 2400 BPS through a residual signal combined with the standard 2400 BPS signal. The addition of the residual signal gives more information about the speech signal being transmitted and allows more accurate reconstruction of the speech based on the received digital signal. The residual signal is adjusted to phase-align all frequency components to zero, then quantizing only the positive half of the residual signal now symmetric about zero time.

REFERENCES:
patent: 4330689 (1982-05-01), Kang et al.
patent: 4378469 (1983-03-01), Fette
patent: 4392018 (1983-07-01), Fette
MIT, "The Lincoln Digital Voice Terminal System", Electronics Systems Division, Aug. 25, 1975.
Tempest Voice Digitizer, ILEX Systems (Jun. 1984).
Vopac, ILEX Systems (Mar., 1984).

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