초록 ▼

A formant tracker for receiving an analog speech signal and generating indicia representative of the formant. A pitch tracker determines the fundamental frequency of the analog speech input. The fundamental frequency is used to control a sinusoidal oscillator in the generation of a sinusoidal signal

A formant tracker for receiving an analog speech signal and generating indicia representative of the formant. A pitch tracker determines the fundamental frequency of the analog speech input. The fundamental frequency is used to control a sinusoidal oscillator in the generation of a sinusoidal signal which when combined with the analog speech input generates a convolution over the chosen formant frequency. The process is repeated for each integer multiple of the fundamental frequency, thereby changing the sinusoidal oscillator. The optimal integer multiple is chosen which generates the formant identification. The optimal integer is also used to generate an appropriate bandwidth. Three formant frequency ranges are used to define human speech. The optimal integers for the other two formant identifications and the appropriate bandwidths are similarly determined. The three optimal integer values are combined with the fundamental frequency to get the three formant values and their associated bandwidths. These formant values and their bandwidths together with the fundamental frequency are communicated as output so as to identify in formant form the analog signal.

대표청구항 ▼

A formant tracker for receiving an analog signal, said formant tracker comprising: means for tracking a pitch associated with the analog signal and generating a fundamental frequency therefrom; and means operably coupled to the output of said pitch tracking means for receiving the fundamental freque

A formant tracker for receiving an analog signal, said formant tracker comprising: means for tracking a pitch associated with the analog signal and generating a fundamental frequency therefrom; and means operably coupled to the output of said pitch tracking means for receiving the fundamental frequency of the analog signal to determine at least one formant within a frequency spectrum in which the analog signal is found, said formant determining means including means establishing an integer set including a plurality of integers associated with at least a selected frequency range containing said at least one formant and within said frequency spectrum in which the analog signal is found, and means for establishing within said integer set over the plurality of integers contained therein an optimal integer for said selected frequency range within said frequency spectrum from said integer set and a bandwidth associated with said optimal integer; said formant determining means generating said at least one formant in response to the product of said optimal integer and said fundamental frequency.