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Digital Limit Monitor for Speech Recording

IP.com Disclosure Number: IPCOM000085750D
Original Publication Date: 1976-May-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Dixon, NR: AUTHOR [+3]

Abstract

This apparatus produces a visual digital count of the amplitude distribution of a time variant waveform. As such, it is useful for analyzing the distribution of any variable parameter that can be represented by a variable voltage. It is particularly useful for analyzing acoustic signals.

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Digital Limit Monitor for Speech Recording

This apparatus produces a visual digital count of the amplitude distribution of a time variant waveform. As such, it is useful for analyzing the distribution of any variable parameter that can be represented by a variable voltage. It is particularly useful for analyzing acoustic signals.

By suitable selection of the circuit parameters, the apparatus provides great flexibility in the choice of voltage ranges and thresholds for display, as well as variations in duration of the sampling period, the number of samples per period, and the system granularity.

The waveform to be analyzed appears as a variable voltage on line 10 entering the analog-to-digital converter 11, wherein it is converted to a binary- coded output of the requisite number of bits to cover the voltage range of the input signal. As shown, the converter 11 produces coded outputs for both positive and negative voltage levels, although there is nothing to preclude biasing the input with a fixed DC voltage to produce only positive voltages.

The coded outputs appearing on the lines 12 are converted to decimal values in the positive and negative demultiplexors 13 and 14, which effectively commutate the successive decimal lines to produce a pulse whose time position manifests the voltage level. The demultiplexor outputs are individually gated by switches 15 to the multiinput OR gate 16. Thus, every time a voltage level corresponding to one or more of the closed swi...