Pitch control apparatus for sound reproducing system

Details Pitch control apparatus for sound reproducing system Pitch control apparatus for sound reproducing system

1995-01-25

1996-11-05

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 8, 360 32, 360 65, 360 7308, 369 54, 369124, G11B 2736, G11B 700

Patent

active

055723772

ABSTRACT:
In a recording medium playback device, such as a tape recorder, the playback speed is changed from the speed used during recording but the sounds and voices being reproduced can be listened to at the normal pitch, as if the playback tape speed was the same as the recording speed. A frequency generator (FG) system is not required and the playback signal is converted in pitch based on a capstan motor drive signal that is converted to a voltage value and that controls a pitch converting circuit. Alternatively, the pitch converting circuit is controlled by a signal derived from a speed control system, whereby the capstan motor speed is controlled by the user of the tape recorder. By converting the pitch of the playback signal in this way a recording of a conference, for example, can be scanned at high speed yet the reproduced voices are provided with a normal pitch.

REFERENCES:
patent: 4020291 (1977-04-01), Kitamura et al.
patent: 4348699 (1982-09-01), Tsuchiya et al.
patent: 4406001 (1983-09-01), Klasco et al.
patent: 4418366 (1983-11-01), Moriya
patent: 4734795 (1988-03-01), Fukami et al.
patent: 4831466 (1989-05-01), Murakami et al.
patent: 5392163 (1995-02-01), Higuchi et al.

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