System for time compression and expansion of audio signals

Details System for time compression and expansion of audio signals System for time compression and expansion of audio signals

1975-08-20

1977-04-26

Lucas, Jay P.

Dynamic magnetic information storage or retrieval

Head

Core

360 8, H04B 166, G11B 500

Patent

active

040202917

ABSTRACT:
A system for time compression and expansion of audio signals comprises a filter for filtering the fundamental frequency component of an input signal reproduced at a speed differing from that at the time of recording, first and second memory devices for carrying out writing in or memorizing and reading out at speeds in accordance with the frequency of applied clock pulses, a control signal forming circuit for forming gate control signals and clock pulse signals of different frequency from the output fundamental frequency component of the filter in synchronism with the pitch period thereof, and gates controlled by the gate control signals to pass or not pass the output signals of the first and second memory devices. A time compressed or expanded signal synchronized with the pitch period of the fundamental frequency component of the input signal is led out through these gates.

REFERENCES:
patent: 3831192 (1974-08-01), Gross et al.
patent: 3855424 (1974-12-01), Tharmaratnam
patent: 3860760 (1975-01-01), Rittenbach
patent: 3873778 (1975-03-01), Mutsuura
patent: 3878560 (1975-04-01), Ramage

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