Signal conditioning apparatus
First Claim
1. An apparatus for producing a spectrally normalized human voice signal from a human voice input, said spectrally normalized human voice signal being sent to a voice recognition system, said apparatus comprising:
- a pitch altering circuit receiving said human voice input and producing an intermediate analog output;
a frequency bandwidth limiting circuit receiving said intermediate analog output and producing said spectrally normalized human voice signal; and
a means for receiving a control signal from the voice recognition system to control a characteristic of said normalized human voice signal.
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Abstract
An signal conditioning apparatus and method to condition a human voice signal for input to a time-domain voice recognition system. The signal conditioner normalizes sampled human voice inputs so that all inputs result in an output with substantially the same pitch and frequency bandwidth characteristics. The signal conditioner includes a pitch altering circuit that alters the pitch of the input human voice signal and a frequency band limiting circuit that limits the range of spectral information contained in a signal. The pitch altering circuit converts the input into a digital signal at a first conversion rate and converts the digital signal back to an analog signal at a second rate which is unequal to the first rate. The frequency band limit circuit is a plurality of filters at different points in the frequency spectrum.
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Citations
25 Claims
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1. An apparatus for producing a spectrally normalized human voice signal from a human voice input, said spectrally normalized human voice signal being sent to a voice recognition system, said apparatus comprising:
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a pitch altering circuit receiving said human voice input and producing an intermediate analog output; a frequency bandwidth limiting circuit receiving said intermediate analog output and producing said spectrally normalized human voice signal; and a means for receiving a control signal from the voice recognition system to control a characteristic of said normalized human voice signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for producing a conditioned human voice signal for input to a voice recognition system, said method comprising the steps of:
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converting a human voice input to an audio signal, said audio signal having a pitch characteristic and a frequency bandwidth characteristic; altering said pitch characteristic of said audio signal; narrowing said frequency bandwidth characteristic of said audio signal to produce said conditioned human voice signal; and receiving a signal from the voice recognition system to control a characteristic of the audio signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. An apparatus for normalizing a human voice signal for input into a voice recognition system, said apparatus comprising:
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an input device receiving said human voice input and producing a first intermediate analog signal; a pitch altering circuit receiving said first intermediate analog signal and producing a second intermediate analog signal; a frequency bandwidth limiting circuit receiving said second intermediate analog signal and producing said normalized human voice signal for input to said voice recognition system; and a means for receiving a control signal from said voice recognition system to control a characteristic of said normalized human voice signal. - View Dependent Claims (24, 25)
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Specification