Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1995-06-26
1997-12-16
Kuntz, Curtis
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
395 22, H04M 1100, G10L 302
Patent
active
056994044
ABSTRACT:
A communication system using voice compression includes a transmitter base station (113) and a selective call receiver (112). The transmitter base station (113) includes an input device (204) to receive an audio voice message which is stored in a memory (209). A processing device (208) digitizes the audio voice message to provide an input signal which is divided into a sequence of equivalent time frames, and differences in a short-term frequency spectrum between adjacent time frames is determined to derive distance measurements. A speed factor is computed as an average of the distance measurements, and the input signal is time-scales in accordance with the speed factor and then transmitted by a transmitter (102). The selective call receiver (112) includes a receiver (105) which receives the time-scaled signal, a processing device (115, 106) which demodulates and expands the time-scaled signal in accordance with the speed factor to provide a reconstructed signal which is amplified by an amplifier (108) into an audio signal.
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Lawrence R. Rabiner, On Creating Reference Templates for Speaker Independent Recognition of Isolated Words, IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-26, No. 1, Feb. 1978, pp. 34-41.
Atal and Schroeder, Predictive Coding of Speech Signals and Subjective Error Criteria, IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-27, No. 3, Jun. 1979, pp. 247-254.
Satyamurti Sunil
Sibecas Salvador
Kuntz Curtis
Macnak Philip P.
Meles Pablo
Motorola Inc.
Richardson Scott
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