Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1975-05-12
1976-12-28
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
1791001PS, 360 63, 360 72, G11B 1518, G11B 1506, G11B 2722, G11B 1552
Patent
active
040005186
ABSTRACT:
A signal detection arrangement is disclosed for detecting signals during variable speed tape movements such as during tape rewinding or fast forward speeds. To elaborate, information encoded as multifrequency information tones is grouped in exercises on a recording tape, and at least two low frequency tones are provided at the beginning of each exercise. Each of these low frequency tones has a frequency which is related to the frequency of a different one of the information tones by a multiple of the ratio of the rewind speed to the normal forward speed times a predetermined factor. Accordingly, during normal playback these low frequency tones will not be detected. However, during fast forward or rewind, each of these tones will be multiplied up to a detectable frequency. Moreover, even over wide variations in these "fast" speeds, at least one of these low frequency tones will be detected.
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J. A. Calder et al., Automatic Electric Technical Journal, An Automatic Call Simulator for Training TSPS Operators, July 1971, pp. 286-292.
Bell Telephone Laboratories Incorporated
Eddleman Alfred H.
Landis Martin S.
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