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Varying the Duration of Spoken Utterances

IP.com Disclosure Number: IPCOM000091638D
Original Publication Date: 1968-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 3 page(s) / 41K

Publishing Venue

IBM

Related People

Beetle, DH: AUTHOR [+2]

Abstract

This device is used in a method for decreasing the duration of spoken words or short phrases in vocabulary preparation for computer speech output devices. The device consists of a magnetic tape loop, a three-speed drive assembly, and ten magnetic heads. Two of the heads, one erase and one record-playback, are mounted to operate on the upper track of the tape and are used for timing information. The remaining eight heads operate on the lower, or audio, track. Six are used for playback alone, one for both recording and playback and one for erase. The seven audio heads used for playback are mounted on sliders on a track such that they can be moved and positioned at various points on the track.

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Varying the Duration of Spoken Utterances

This device is used in a method for decreasing the duration of spoken words or short phrases in vocabulary preparation for computer speech output devices. The device consists of a magnetic tape loop, a three-speed drive assembly, and ten magnetic heads. Two of the heads, one erase and one record-playback, are mounted to operate on the upper track of the tape and are used for timing information. The remaining eight heads operate on the lower, or audio, track. Six are used for playback alone, one for both recording and playback and one for erase. The seven audio heads used for playback are mounted on sliders on a track such that they can be moved and positioned at various points on the track. The device has circuitry, not shown, for erasing and recording, as well as playback of the signal from the loop using the playback heads one-by-one in a controllable sequence. In addition, circuitry, not shown, operates an idler solenoid, thus starting the loop at the proper time to synchronize with the drum of an audio response unit. The seven movable playback heads are the key to the function of time compression. The electrically operated idler is the key to the function of synchronizing the compressed word with a drum time slot not shown. This is termed time-slotting.

After a word or phrase is recorded on the loop in a normal manner, it can be reproduced by amplifying the signal from any one of the seven playback heads. The heads all read the same signal but at different times. The delay is proportional to the distance between the heads. The playback heads are 1...7, 1 being that head which the signal passes last. In the case of time compression, the system is initiated by reproducing from head 1 until a point in the utterance is reached where the beginning of a deletion is desired. At this point, the reproduce amplifier is switched rapidly from head 1 to head 2, thus deleting the portion of the utterance between those two heads at the instant of switching. The deleted portion consists of the signal which has already passed head 2 but has not yet reached head 1. Reproduction continues from head 2 until the beginning of a second deletion is desired. At this time, the reproduce amplifier is switched rapidly from head 2 to head 3, thus deleting the portion of the utterance between these two heads. The process is repeated until the desired number of deletions has taken place. The last head to be connected reproduces the remainder of the utterance. Time expansion is performed in a similar manner by sequencing the heads in rev...