Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1987-09-14
1992-10-20
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
G10L 500
Patent
active
051577275
ABSTRACT:
A process is disclosed for digitizing (more precisely encoding) speech for the purpose of reducing information rate and bandwidth relative to that of prior art means to digitize speech, while enjoying a high signal to noise ratio. Using the the same encoding techniques the process can be used for storage of speech and machine recognition of speech. The process depends on detecting audio waveform zero crossings and generating uniform pulses at the time of the zero crossings. The uniform pulses are created through a regenerative process and are independent of the actual waveform shape save the time of zero crossing. Transmission (or storage) of these uniform pulses permits reconstruction of highly intelligible speech. Ratios of times between zero crossings is used in a new technique for machine word recognition; said ratios allowing recognition regardless of the speakers actual speech rate.
REFERENCES:
patent: 3553372 (1971-01-01), Wright
patent: 4070550 (1978-01-01), Miller
Fawe, "Interpretation of Infinite Clipped Speech", IEEB Trans. on Audio and EA, Dec. 1966, pp. 178-183.
Electronics Review, "Phone Setup . . . ", Electronics, Mar. 17, 1977, pp. 9E-10E.
McGraw-Hill Dictionary of Scientific and Technical Terms (Zd ed. 1978), pp. 1289-1291.
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