Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1981-06-04
1984-04-10
Kemeny, E. S. Matt
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
370 691, 179 84VF, G10L 100
Patent
active
044425406
ABSTRACT:
A system for interpolating digital data signals to a frequency band above analog speech signals in a common transmission channel is disclosed. The system utilizes short time frequency analysis techniques to determine the cutoff frequency of the speech signal. Data signals temporarily held in storage within the system are thereafter modulated into an unused frequency band of the transmission channel above that needed for speech signals. The combined speech and data signals in the system are sent to a receiver which relays the respective speech and data signals to their appropriate locations. This system is compatible with digital signal processing techniques using Fast Fourier Transform Technology in conjunction with solid state logic elements.
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Bell Telephone Laboratories Incorporated
Kearns J. P.
Kemeny E. S. Matt
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