Browse Prior Art Database

Lowest Bit Detector

IP.com Disclosure Number: IPCOM000079532D
Original Publication Date: 1973-Jul-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Cleveland, NG: AUTHOR [+2]

Abstract

The lowest amplitude signal in a series of signals is identified on a slow-speed recording device such as a paper tape recorder.

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Lowest Bit Detector

The lowest amplitude signal in a series of signals is identified on a slow- speed recording device such as a paper tape recorder.

Rectified and filtered samples of a series of input signals representing digital information, for example binary data recorded on a magnetic disc, are sampled and stored as a voltage value in a first storage circuit. The stored value is periodically compared against each subsequent value, the lowest value being entered into a second storage circuit. The output of this latter circuit identifies the lowest amplitude signal in the series.

Input signals A are integrated (in a half-wave rectifier and capacitive filter) and supplied to a clock. The first sample and hold circuit stores the voltage amplitude of the integrated signal B at time t(1). The contents of this circuit are subsequently transferred to a second sample and hold circuit at sample time t(3) if there is an output C<D from a comparator or, initially, when an external read gate signal supplies a nominal value. The rectifier-filter is reset (shorted) at time t(4).

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