Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Speech Digitizer and Synthesizer

IP.com Disclosure Number: IPCOM000094615D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Bandat, K: AUTHOR [+2]

Abstract

The apparatus digitizes a voice input and utilizes the digital information to synthesize a corresponding voice output. Thus, the digital information can be stored by a data processor and played back through the synthesizer at any time.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 71% of the total text.

Page 1 of 2

Speech Digitizer and Synthesizer

The apparatus digitizes a voice input and utilizes the digital information to synthesize a corresponding voice output. Thus, the digital information can be stored by a data processor and played back through the synthesizer at any time.

A speech signal supplied by microphone 10 is split up among the spectrum channels F1...Fn. This is effected by a plurality of band-pass filters 11...14, rectifiers 21...24 and low-pass filters 31...34. The outputs of these channels are voltage levels corresponding to the variation with time of the momentary energy of the speech signal for each frequency band. The signals are applied to rotary switch 40. This is rotated in the direction of arrow 41 at a constant rotational speed, thus sampling each of the channels. The results of the sampling operation are applied to digital-to-analog converter 42. This converts the analog signal into a digital value which is supplied to data processor 43.

Simultaneously, the glottal pulse period is detected by low-pass filter 50 and zero-crossing detector 51. This provides a number of pulses representative of the time between zero-crossings of the voice signal to delay circuit 52. Delay 52 supplies the resultant data to the processor 43.

To reconvert such data into artificial speech, rotary switch 60 is provided. This rotates in the direction of arrow 61 at a rate determined by the pulse periods detected by detector 51. The data from channels 11...14 is organized by...