Speech signal A/D converter using an instantaneously-variable ba

Details Speech signal A/D converter using an instantaneously-variable ba Speech signal A/D converter using an instantaneously-variable ba

1979-06-04

1981-06-02

Atkinson, Charles E.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

179 1555R, 330107, 330110, 333 14, G10L 100

Patent

active

042713323

ABSTRACT:
In a preferred embodiment of the invention the audio signal is bandwidth limited before being differentiated to provide either a positive or negative signal (depending on the slope of the audio signal) to a comparator which provides a corresponding logical one or zero at its output. A digital logic circuit connected to the comparator output is clocked to provide a digital output signal transition from a logical one to a zero or vice versa if its input has changed from a logical one to a zero or vice versa at least once during the clock period. The clocked digital output of the logic circuit is provided as an input to a computer where it is stored. The digital data is subsequently read out of the computer and provided to a filter and integrator to provide an audio signal replica of the filtered input audio signal.

REFERENCES:
patent: 2262846 (1941-11-01), Herold
patent: 3832536 (1974-08-01), Le Dily et al.
patent: 3937897 (1976-02-01), Song
J. Graeme et al., "Operational Amplifiers", McGraw Hill, 1971, p. 266.
J. Licklider et al., "Effects of Differentiation, etc., Upon Intelligibility of Speech", J. Ac. Soc. Am., Jan. 1948, pp. 42-51.
J. Licklider, "The Intelligibility of . . . Speech Waves", J. Ac. Soc. Am., Nov. 1950, pp. 820-823.
Catalog, "ECL 2 and ECL 10K", Signetics Corp., 1973, Nos. 10124, 10125 specs. only.

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