System for transferring wideband sound signals

Details System for transferring wideband sound signals System for transferring wideband sound signals

1974-05-17

1976-03-23

Claffy, Kathleen H.

179 1555T, 179 1SA, H04J 300, G10L 100

Patent

active

039461629

ABSTRACT:
A system for transmitting wideband signals, for example speech, over a narrow band is proposed. Lower frequency range signals are directly transmitted and amplitude information of partial upper frequency ranges is transmitted on pilot frequencies. At a receiver, "equivalent" signals from oscillators having frequencies approximately equal to the mid range frequencies of the partial upper frequency ranges are modulated with the amplitude information of the corresponding partial upper frequency ranges to produce "synthetic" signals. The synthetic signals are modulated with narrow band noise to crreate a more pleasing and realistic sound. Means are provided for controlling at the pick-up end the "modulation factor" of the noise modulation at the reproducing end. This is achieved by controlling the level of the third harmonic of a sync signal transmitted from the pick-up end. The level of the third harmonic may be automatically or manually adjusted to conform to the type of sound being transmitted.

REFERENCES:
patent: 3030450 (1962-04-01), Schroeder
patent: 3102929 (1963-08-01), De Jager
patent: 3116374 (1963-12-01), Franco
patent: 3321582 (1967-05-01), Schroeder

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