Magnetic recorder/reproducer

Details Magnetic recorder/reproducer Magnetic recorder/reproducer

1985-01-29

1987-06-23

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Converting an analog signal to digital form for recording;...

360 381, 360 48, G11B 500, G11B 509, H04N 578

Patent

active

046757546

ABSTRACT:
A magnetic recorder/reproducer converts two-channel analog signals into digital signals by a sample-and-hold/A-D converter circuit (3) and controls addresses in a memory circuit (4) by a memory address control circuit (5), to distribute the digital signals into odd sample groups and even sample groups per each channel for arraying the odd sample groups and the even sample groups of the same channel in alternate scanning intervals, thereby to write the same in the memory circuit so that the odd samples and the even samples of the same channel are arrayed in positions separated from each other along the direction of scanning by rotary heads (10, 11). The digital signals thus permutated are modulated by a modulation circuit (7), to be recorded in a magnetic tape by the rotary heads. The digital signals reproduced by the rotary heads are demodulated by a demodulation circuit (14), to be stored in a memory circuit (15). A memory address control circuit (16) controls addresses so as to permute samples of the reproduced digital signals stored in the memory circuit to be in the original array thereof. The reproduced digital signals read from the memory circuit are converted into analog signals by a D-A converter (18), to be outputted through a low-pass filter (19).

REFERENCES:
patent: 4224642 (1980-09-01), Mawatari et al.
patent: 4506306 (1985-03-01), Veilard
patent: 4544958 (1985-10-01), Odaka
"On the System Design and the Signal Processing of a Rota Head Dat", Yoshinobu Ishida et al., Consumer electronics Devel. Lab. Mitsubishi.
"On the Development of a Rotary-Head Digital Audio Tape Recorder", Yoshinobu Ishida et al., 79th Convention, Audio Engineering Society.

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