Electrical audio signal processing systems and devices – Feedback suppression
Patent
1982-10-14
1985-01-08
George, Keith E.
Electrical audio signal processing systems and devices
Feedback suppression
H04B 1500
Patent
active
044931018
ABSTRACT:
An anti-howl back device which includes various devices and a CPU that controls these devices, their decisions, and their processings in order to output the signals which are fed into a selector circuit upon the removal of acoustic feedback components in a manner that makes a decision on presence of a synchronous signal and an address signal in combination in the output from the selector circuit. Upon the affirmative result of such a decision, an A-D converter carries out an A-D conversion of the sample obtained by a sampling performed in synchronism with a synchronous signal and then subtracts the data which has been fetched from an address in a memory system corresponding to the address signal in combination with the synchronous signal from the data derived as a result of the A-D conversion. The new data thus obtained is then stored in the memory system while being concurrently delivered to a D-A converter. A multiplexer then carries out an addition to the output from the D-A converter of the synchronous signal and the address signal corresponding to the address of the new data that has been stored in the memory system. Upon a negative result of the decision, the A-D converter carries out an A-D conversion of the sample obtained by a sampling performed by a given timing and then stores the new data thus obtained in the memory system while concurrently delivering such new data to the D-A converter. A multiplexer adds to the output from the D-A converter the synchronous signal and the address signal corresponding to the address of said new datum that has been planted in the memory system.
REFERENCES:
patent: 3894200 (1975-08-01), Campanella et al.
patent: 4153815 (1979-05-01), Chaplin et al.
Muraoka Shigetaro
Sakamoto Mineo
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