Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1989-02-15
1991-04-16
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
375 37, 381 36, G10L 500
Patent
active
050089404
ABSTRACT:
The methods and apparatus disclose a signal processing system acquiring the half-period and magnitude of the highest frequency component at any one time of an analog signal. Two comparators compare positive and negative going slopes of the signal to respective out of phase versions of themselves. Maxima and minima are detected by the respective comparators to set and reset two timers. The timers time the lengths of the positive and negative going slopes between the maxima and minima. An analog to digital converter converts the magnitude of the signal at the maxima and minima. A microprocessor stores the times and magnitudes in a memory and is in a second embodiment adapted to determine the individual frequency components of the signal from the stored values. The acquired values may be transmitted in digital form or may be reconstructed for analog transmission. The signal may be reconstructed by a microprocessor downloading the positive and negative slope times to a pair of comparators and resetting the respective counters. The magnitude values are converted by digital to analog converter and output through a low-pass filter until the respective comparator values match the counter values. In a third embodiment a number of processing systems are linked to selectively determine the frequency components of the signal.
REFERENCES:
patent: 4382160 (1983-05-01), Gosling
patent: 4613974 (1986-09-01), Vokac
F. A. Marvasti, "A Unified approach to Zero Crossings and Non uniform Sampling", 1987, II. 6, pp. 8-19,22,23,28-33.
R. A. King and W. Gosling, "Time Encoded Speech," unpdated, pp. 140-143.
S. Kay "Zero Crossing Based Spectrum Analyzer", IEEE Transactions, ASSP-34, Feb. 1986, pp. 96-104.
A. Zakhor & A. Oppenheim, "Reconstruction of Two-dimensional Signals from Level Crossings," IEEE Proceedings, Jan. 1990, vol. 78, No. 1, pp. 31-55.
Integrated Circuit Technologies Ltd.
Kemeny Emanuel S.
Wilkes Robert H.
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