Audio signal time-duration converter

Details Audio signal time-duration converter Audio signal time-duration converter

1974-09-25

1976-04-06

Claffy, Kathleen H.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340173R, G11B 1300

Patent

active

039491757

ABSTRACT:
An audio signal time-duration converter comprises a random access memory. The compression and expansion of input signals is effected by designating an address in the random access memory and assigning the designated address to a write mode or read mode. The address designation is effected either from an output from a write address counter which serves to count write clock pulses or an output from a read address counter which serves to count read clock pulses. However, in the event of overlap of the read and write clock pulses, the outputs are controlled exclusively by the write clock pulses. In addition, the time duration of the read and write clock pulses is made to be different so that both operations are ensured in a sequential manner in case of such overlap.

REFERENCES:
patent: 3104284 (1963-09-01), French et al.
patent: 3621150 (1971-11-01), Pappas
patent: 3752912 (1973-08-01), Oshawa et al.
patent: 3803363 (1974-04-01), Lee
patent: B262287 (1975-01-01), Yoshino et al.

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