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Data Detection With Automatic Clipping Adjust

IP.com Disclosure Number: IPCOM000094205D
Original Publication Date: 1966-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Aziz, RA: AUTHOR

Abstract

This peak detecting circuit has automatic clipping level control.

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Data Detection With Automatic Clipping Adjust

This peak detecting circuit has automatic clipping level control.

When detecting data pulses are read from a magnetic recording, baseline clipping is employed to eliminate extra pulses produced by background noise, etc. Since the amplitude of the read-back signal can vary over a wide range, an automatic gain control amplifier is employed with a fixed clipping level. To change the response time and reduce the distortion and noise problems of such a system, a fixed gain amplifier is employed. The clipping level of the detection system is adjusted as a function of read-back signal amplitude.

Data detector circuitry and waveforms at different stages of the circuit are shown. An amplified read signal A is supplied to positive rectifier 1 and negative rectifier 2 which produce waveforms B and C, respectively. Rectified signal B is used to store amplitude information in capacitor memory 3. DC amplifier 4 senses memory 3 and provides an input to voltage comparator 5 to control the clipping level. The clipping level, waveform D, is adjusted and maintained at a selected fixed percentage of the input signal amplitude.

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