Tonearm control system based on absolute tonearm position

Details Tonearm control system based on absolute tonearm position Tonearm control system based on absolute tonearm position

1979-02-26

1981-11-17

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 41, G11B 1722

Patent

active

043015263

ABSTRACT:
A tonearm control device in which tonearm position is detected by counting output pulses generated in response to a reversible electric motor output used for providing horizontal tonearm movement. A sensor is employed to detect non-recorded portions between recorded bands of music and also the initial position of a record disk. The sensor is supported on a supporting arm separate from the tonearm. The output pulses are counted in a counter of a RAM and the number of pulses corresponding to a distance between the sensor and the stylus of the cartridge is added in an adder in a CPU to the content of the counter. The output of the CPU is memorized in assigned positions of a memory in the RAM, the number of which corresponds to numbers of selected music. The contents of the memory are compared with the output pulses. When coincidence occurs, reproduction of the band of music is achieved. Hence, it is possible to change the cartridge independent of the sensor.

REFERENCES:
patent: 3662363 (1972-05-01), Chertok
patent: 3937903 (1976-02-01), Osann, Jr.
patent: 3993315 (1976-11-01), Hansen et al.
patent: 4093832 (1978-06-01), Isaacson et al.
patent: 4114893 (1978-09-01), Leach et al.
patent: 4135086 (1979-01-01), Baba
patent: 4166621 (1979-09-01), Isaacson et al.

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