Device for reproduced sound pitch modification in a tape player

Details Device for reproduced sound pitch modification in a tape player Device for reproduced sound pitch modification in a tape player

1983-06-28

1985-12-31

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Recording for changing duration, frequency or redundant...

360 32, G11B 500

Patent

active

045624887

ABSTRACT:
A pitch modification system for signals received from a tape player converts analog signals received from the player to binary digital form and stores them in sequential addresses in a memory unit at a rate set by a first clock. Output signals are produced by sequentially reading the stored information at a different rate as set by the frequency of a second clock, the ratio between the two clock frequencies causing the desired change in pitch with respect to the original signal. The output signal is converted from digital binary representation to an analog signal by a D/A converter. A detecting means is employed to detect no-signal conditions and generates an automatic reset signal which equalizes the two clock frequencies to restore the system to a zero-shift condition attendant to the appearance of silent passages on the tape.

REFERENCES:
patent: 4301480 (1981-11-01), Kitamura
patent: 4365115 (1982-12-01), Nagata et al.

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