Digital transmission system for transmitting speech signals at a

Details Digital transmission system for transmitting speech signals at a Digital transmission system for transmitting speech signals at a

1975-07-10

1977-09-06

Pitts, Harold

179 15A, 179 1555R, 179 15BW, H04N 712, H04B 700

Patent

active

040471080

ABSTRACT:
In a digital transmission for low bit rate transfer of speech signals, the frequency information content of the speech signal is transferred via a first transmitter channel and the amplitude information content is transferred via a second transmitter channel. A particularly low bit rate of 4.8 to 7 kbits/second is made possible in that the transmission device in the first transmitter channel is in the form of a uniform delta modulator which is provided with an input circuit which so changes the shape of the speech signal that the input signal to the delta modulator has a constant slope.

REFERENCES:
patent: 2724740 (1955-11-01), Cutler
patent: 3521044 (1970-07-01), Costas
patent: 3573364 (1971-04-01), Shimamura
patent: 3750024 (1973-07-01), Dunn

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