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Interphrase Decision Clamp and Word Window

IP.com Disclosure Number: IPCOM000076911D
Original Publication Date: 1972-May-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Clapper, GL: AUTHOR

Abstract

In previous word recognition systems, a decision clamp was used to stop the sampling clock to avoid later spurious decisions after each word decision. However, a clock clamp is also required at the start of a word phrase to hold the clock off after the usual delay to reset the processor circuits has expired. The circuit provides a clock-clamping circuit which provides a clamp between phrases until two clock periods have elapsed after the start of voicing, and also provides a word window with a variable delay to allow a look at selected words in a phrase or the elision effects at word junctures.

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Interphrase Decision Clamp and Word Window

In previous word recognition systems, a decision clamp was used to stop the sampling clock to avoid later spurious decisions after each word decision. However, a clock clamp is also required at the start of a word phrase to hold the clock off after the usual delay to reset the processor circuits has expired. The circuit provides a clock-clamping circuit which provides a clamp between phrases until two clock periods have elapsed after the start of voicing, and also provides a word window with a variable delay to allow a look at selected words in a phrase or the elision effects at word junctures.

The voice controlled clock described in the IBM Technical Disclosure Bulletin Vol. 14 No. 12, May 1972, pages 3655 and 3656, is reset for synchronized clock starting by OR 1, which receives as input all bandpass filter outputs and energizes the inverting time delay 2. The resulting output will have short positive pulses for interword spaces and longer positive levels at phrase endings, as indicated by the graph on output line 3. The positive levels clamp the sampling clock to prevent sampling during quiet intervals. The positive levels on line 3 pass to a time delay 4, which provides an output on line 5 only a predetermined time after the start of a long silence and extends the normal word reset interval. A switch 6 can be set to OFF to pass this signal through an OR 7 and a delay timer 8 as the WORD END CLAMP signal. A clock sign...