Apparatus for and method of noise-free detection of inter-featur

Details Apparatus for and method of noise-free detection of inter-featur Apparatus for and method of noise-free detection of inter-featur

1980-03-25

1981-09-15

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 744, G11B 1516, G11B 1552, G11B 1910

Patent

active

042900905

ABSTRACT:
Recorded features on a recording medium have inter-feature pauses which must be reliably detected in order to control the selective replay of the features. Certain noise signals located within an inter-feature pause complicate the detection of the latter. These noise signals include low-frequency signals which have high voltage levels at playback speed, and middle- and high-frequency signals which have high voltage levels at fast forward or rewind speed. These high voltage levels of the noise signals could be mistaken for audio signals. A signal-processing circuit filters the noise signals from the audio signals. A control circuit changes the impedance of the signal-processing circuit such that the signals are filtered according to a first predetermined filter characteristic when the recording medium advances at playback speed, and according to a different second predetermined filter characteristic when the recording medium advances at fast forward or rewind speed. The filter characteristics attenuate the high voltage levels of the noise signals to low voltage levels, thereby preventing the noise signals from being mistaken for audio signals at the playback or fast forward or rewind speeds.

REFERENCES:
patent: Re30416 (1980-10-01), Yasunaga
patent: 3723666 (1973-03-01), Ferrari
patent: 3893177 (1975-07-01), Takenaka
patent: 3918086 (1975-11-01), Blackie et al.
patent: 4195319 (1980-03-01), Ida
patent: 4228471 (1980-10-01), Shiga

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