Audio data reproducing device for reproducing digital voice sign

Details Audio data reproducing device for reproducing digital voice sign Audio data reproducing device for reproducing digital voice sign

1993-03-26

1995-12-05

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Record editing

360 331, 360 361, H04N 578

Patent

active

054734770

ABSTRACT:
An audio data reproducing device for reproducing digital voice signals from slanted tracks formed on a magnetic tape which is run at a speed different from a speed used for writing, comprising a unit for running the magnetic tape at a predetermined speed, and a playback rotary magnetic head adapted to be moved by a head moving unit in a direction of crossing the slanted tracks to effect follow-up tracing of the slanted tracks for reproducing signals recorded on the slanted tracks even if the magnetic tape is run at a speed different from the writing speed. The device includes a memory for storing audio data read out from the slanted tracks and a digital signal processor (DSP) for generating, in the low-speed playback mode, write address data for causing audio data recorded on a slanted track traced by the magnetic head to be captured in the memory only when the slanted track traced by the magnetic head is new. The digital signal processor also transmits readout address data conforming to playback speed to the memory to process audio data read out from the memory in accordance with the readout address with Lagrange interpolation. A clear sound conforming to the low-speed playback is produced on the real-time basis during the low-speed playback mode, while no sound is produced during still playback.

REFERENCES:
patent: 4587573 (1986-05-01), Odaka
patent: 4647985 (1987-03-01), Yokosawa
patent: 4800447 (1989-01-01), Toba
patent: 5060077 (1991-10-01), Koya et al.
patent: 5223987 (1993-06-01), Muller

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