A pitch synchronized helium speech unscrambler is disclosed as including a air of bucket brigade analog delay lines which are timely and rapidly loaded with the electrical signal equivalents of human voice signals that are effectively supplied thereto by a receiving transducer. Said voice signal equivalents are then respectively unloaded more slowly from said pair of bucket brigade delay lines than they were loaded therein by a pair of different frequency clock generators driven in alternate suc...

Synthesized speech is produced by a vocal tract model corresponding functionally to the human vocal tract and constructed of a linear digital filter. The parameter of the synthesis vocal tract model are determined by an analysis operation on an original speech signal using an identical vocal tract model, which may be the same model as used for synthesis. The analysis vocal tract model has its parameters adjusted according to a comparison between the original speech signal and the output signal o...

A helium speech decoder of the type that may be used to an advantage by drs living, working, and communicating in and from deep water habitats is disclosed as including a microphone, a digital-to-analog converter, a battery of pairs of shift registers, a like battery of select gate circuits, an analog-to-digital converter, and earphones. A programmable generator produces a plurality of control signals which are timely supplied to the aforementioned components as necessary to effect the concerted...

A device having an analog storage for storing in real time an electric analogue signal proportional to vocal tract resonance periods within speech pitch periods of speech in gas in deep sea diving. A clock is used for providing clock pulses proportional to the depth at which the speech is being made for clocking the analog signal into the analog storage device. A second clock is used for clocking the speech out of the analog storage device at that frequency corresponding to normal voice.

Identification of complex signals such as a phonetic sound in speech is accomplished by the combination of ratio values both between the amplitudes and frequencies of the resonances in the complex sound wave. The amplitude ratio between the signals detected from two resonances (e.g. formants) is derived as a null signal when they match a pair of signal-gain preadjustments during a given time period. This null-signal is also obtained when both input signals are absent during that time period. In ...

A method and system of speech compression by baseband vocal regeneration wherein a baseband signal including the first formant, approximately between 300 and 700 Hz, is transmitted to a receiver and supplied to a signal combining network along with a second formant regenerated from the baseband signal to provide a reconstructed speech signal including the first and second formants. An unvoice or fricative parameter can be transmitted along with the baseband signal and utilized at the receiver to...

A voice synthesizer of the type set forth in U.S. Pat. No. 3,836,717 wherein the control signals applied to the devices in the vocal track model take the form of variable pulse width "duty cycle" waveforms. A novel system for producing the duty cycle signals is disclosed. Variable speech rate is provided.

In an articulated phonetic sound wherein the information bearing group of format resonances varies within different frequency regions in the sound spectrum, such as a phonome by diffferently-pitched speakers the filter-separated signals derived from said group of resonances are regrouped (shifted) in prearranged combinations sequentially until a reference regrouping is established for neutralizing (normalizing) the undesired effect of said variations for adaptation to standard analysis. A specif...

An apparatus which receives coded input data representative of speech feature sequences associated with selected words as spoken by an individual. The coded data is typically formulated beforehand from speech samples of the individual and is entered when the individual is to operate the apparatus. The apparatus is "programmed" by the coded input data to recognize the selected words when they are subsequently spoken by the individual. In accordance with the invention there is provided a feature e...

A time domain speech recognition system is disclosed wherein a speech signal is infinitely clipped in order to derive its zero crossover pattern. A pitch pulse detector generates standardized marker pulses in synchronism with the glottal pressure pulses occurring during voiced sounds. Using these marker pulses as trigger signals, a sampling gate samples the infinitely clipped speech signal in synchronism with the glottal pulses. In the absence of a voiced signal, sampling is performed at a pseud...