Dynamic information storage or retrieval – Dynamic mechanism subsystem – Having power driven transducer assembly
Patent
1978-03-27
1982-03-16
Phillips, Charles E.
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Having power driven transducer assembly
G11B 1706
Patent
active
043204953
ABSTRACT:
A first generator 1 produces a continuously increasing signal corresponding to the tone arm pick-up stylus position, and a second generator 2 produces a synchronizing signal comprising a pulse for each turntable rotation. The synchronizing pulses alternately gate the position signal between a pair of parallel peak holding circuits 5a, 5b whose differential output S is compared with a reference signal T, and when the former exceeds the latter the tone arm is returned. Any cyclical variations in the position signal due to the eccentricity of the record spindle hole are self-cancelling during the differential comparison because their magnitudes are substantially the same when sampled during the same relative periods of the turntable rotation cycle. The high pitch of the lead-out groove at the end of the record play produces a large differential output signal, to thereby trigger the tone arm return.
REFERENCES:
patent: 3599984 (1971-08-01), Tatsuo
patent: 3717818 (1973-02-01), Herbst
patent: 3820033 (1974-06-01), Iwata
patent: 3937903 (1976-02-01), Osann
patent: 3976947 (1976-08-01), Goyot et al.
patent: 4041404 (1977-08-01), Lewis
Phillips Charles E.
Pioneer Electronic Corporation
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