US3662115A — Audio response apparatus using partial autocorrel…

Claim 1

Independent Claim 158 words

An audio response apparatus comprising means for previously storing speech parameters including partial autocorrelation coefficients between two closely adjacent time instants of a speech signal required for answering and excitation source informations, said coefficients being determined by calculating, with respect to a plurality of sampling instants, partial autocorrelation coefficients of said two instants representing the correlation of the difference between the error value predicted by the least squares method from sampled values at said two instants and the actual values of the speech signal at said two points, said excitation source informations being obtained by determining the autocorrelation between remotely separated sampled values; an electronic computer for supplying a command signal for designating the speech parameters of a speech signal to be synthesized; means to read out said speech parameters designated by said command signal from said memory means; and a speech synthesizer response to the output from said read out means to synthesize a desired speech signal.

Claim 2

Dependent Claim 158 words

An audio response apparatus comprising means for previously storing speech parameters including partial autocorrelation coefficients between two closely adjacent time instants of a speech signal required for answering and excitation source informations, said coefficients being determined by calculating, with respect to a plurality of sampling instants, partial autocorrelation coefficients of said two instants representing the correlation of the difference between the error value predicted by the least squares method from sampled values at said two instants and the actual values of the speech signal at said two points, said excitation source informations being obtained by determining the autocorrelation between remotely separated sampled values; an electronic computer for supplying a command signal for designating the speech parameters of a speech signal to be synthesized; means to read out said speech parameters designated by said command signal from said memory means; and a speech synthesizer response to the output from said read out means to synthesize a desired speech signal.

Claim 3

Dependent Claim 195 words

The audio response apparatus according to claim 1 which further includes a speech parameter extractor comprising an autocorrelation coefficient extractor having a plurality of cascade connected partial autocorrelation coefficient detector stages, each of said stages including a delay network connected to receive an speech signal, a correlation coefficient calculator receiving the output from said delay network and for directly receiving said speech signal, a first multiplier connected to receive the output from said delay network and the output from said correlation calculator, a second multiplier connected to directly receive the output from said correlation coefficient calculator and said speech signal, a first adder for adding the output from said delay network and the output from said second multiplier, a second adder for adding the output from said first multiplier and said speech signal, and a quantizer to quantize the output from said correlation coefficient calculator to provide a partial autocorrelation coefficient between said two instants; an autocorrelator connected to one output terminal of the last detector stage of said extractor; and a maximum value selecting means for determining the period and amplitude of an excitation source signal from a group of outputs from said autocorrelator.

Claim 4

Dependent Claim 88 words

The audio response apparatus according to claim 1 wherein said speech signal synthesizer comprises a pulse generator and a white noise generator which are controlled by the fundamental pitch period of the speech, an amplitude controller connected to said generators and controlled by the fundamental amplitude information of the excitation source, and means for controlling the output from said amplitude controller in accordance with the partial autocorrelation coefficient designated by said electronic computer for reconstructing the speech signal by the correlation between a group of said correlation coefficients.

Claim 5

Dependent Claim 189 words

An audio response apparatus comprising means for deriving speech parameters from partial autocorrelation coefficients and an excitation source information of respective speech signals regarding a plurality of speech signals required for answering; memory means for storing said speech parameters; an electronic computer for sending a command signal designating the speech parameters for respective output channels to send answers to a plurality of output channels; a plurality of read out means to read out speech parameters designated by said electronic computer from said memory means, a single speech synthesizer connected to receive a plurality of sets of the speech parameters from said reAd out means on the time division basis to form a group of digital codes representing respective sets of designated speech wave from the excitation source signals corresponding to the excitation source informations and said partial autocorrelation coefficients of respective sets of speech parameter; means to read out on the time division basis a group of digital codes from said speech synthesizer and to convert said digital codes into pulse amplitude modulated signals; and timing gate means for distributing said modulated signals among a plurality of output channels.

Claim 6

Dependent Claim 189 words

An audio response apparatus comprising means for deriving speech parameters from partial autocorrelation coefficients and an excitation source information of respective speech signals regarding a plurality of speech signals required for answering; memory means for storing said speech parameters; an electronic computer for sending a command signal designating the speech parameters for respective output channels to send answers to a plurality of output channels; a plurality of read out means to read out speech parameters designated by said electronic computer from said memory means, a single speech synthesizer connected to receive a plurality of sets of the speech parameters from said reAd out means on the time division basis to form a group of digital codes representing respective sets of designated speech wave from the excitation source signals corresponding to the excitation source informations and said partial autocorrelation coefficients of respective sets of speech parameter; means to read out on the time division basis a group of digital codes from said speech synthesizer and to convert said digital codes into pulse amplitude modulated signals; and timing gate means for distributing said modulated signals among a plurality of output channels.

Claim 7

Dependent Claim 196 words

The audio response apparatus according to claim 4 comprising cyclic memory means for storing speech parameters including excitation source informations and said partial autocorrelation coefficients regarding a plurality of speech units of a predetermined constant length to be required to send an answer, in a plurality of cyclic store arrangements each divided into a plurality of frames, a parameter buffer memory for temporally storing the speech parameters in respective frames of the speech unit read out from said cyclic memory means; a speech synthesizer including a purely digital logic means response to the speech units designated by the electronic computer and to be answered to a plurality of output channels for correlating the excitation source signals corresponding to the speech informations of the speech parameters selectively read out by said parameter buffer memory means under the control of said partial autocorrelation coefficients whereby to convert said speech parameters into a group of digital codes representing the waveforms of respective speech signals designated; an output buffer memory for temporally storing the group of said digital codes from said speech synthesizer; and means for converting said digital codes read out from said output buffer memory into analogue signals.

Claim 8

Dependent Claim 115 words

The audio response apparatus according to claim 4 which comprises means for successively storing vacant addresses of a memory speech parameters each including an excitation source information and a partial autocorrelation coefficient regarding a plurality of speech units required for sending an answer of a predetermined length; a parameter buffer memory for temporally storing the speech parameters of a speech unit read out from an address in said memory corresponding to the speech unit designated by said electronic computer and to be answered to a plurality of output channels; and means for successively reading out said speech parameters from said parameter buffer memory and to apply said read out speech parameters to said speech synthesizer.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-05-09	1975-11-08	1976-05-09	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-05-09	1979-11-08	1980-05-09	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-05-09	1983-11-08	1984-05-09	$7700.00	Window Closed / Lapsed

Audio response apparatus using partial autocorrelation techniques

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag