1977-06-29
1978-10-17
Brown, Thomas W.
G10L 100
Patent
active
041210514
ABSTRACT:
Upon operating a key on a phonetic keyboard, the clock circuit gate is opened to permit the counters, normally held in reset condition, to begin counting. Each of the memories (organized in 2048 .times. 8 bits) that are connected in parallel to the counters begin to emit the digital representation in CVSD (Controlled Variable Slope Delta Modulation) form of the repertoire of phonetic sounds with each memory containing the entire phonetic alphabet. The keyboard switch selects the desired data stream output from an addressed memory which represents the chosen phonetic sound, and guides this data stream to a CVSD demodulator, thus producing an analog representation of the desired sound. This sound may be amplified and reproduced by means of a loudspeaker or alternatively, it may be amplified and placed on a telephone line. A feature of the invention is a stop decode gate which automatically stops the counting for a short phonetic sound.
REFERENCES:
patent: 3575555 (1971-04-01), Schanne
patent: 3631520 (1971-12-01), Atal
patent: 3641496 (1972-02-01), Slavin
patent: 3870818 (1975-03-01), Barton et al.
patent: 3908288 (1975-09-01), Brown
patent: 3928722 (1975-12-01), Nakata et al.
patent: 4047108 (1977-09-01), Bijker
Master Specialties Corp. Brochure, "Expandable Voice Annunciator", 1976.
W. Buckholz, "Computer Controlled Audio Output," IBM Tech. Discl. Bull., Oct., 1960.
Brown Thomas W.
Hill Alfred C.
International Telephone & Telegraph Corporation
Kemeny E. S.
O'Halloran John T.
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