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US 5,966,687 AGranted
Vocal pitch corrector
AssigneeC-Cube Microsystems, Inc.
InventorEric Ojard
Life of this patent
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Abstract
A method and system are provided for correcting a pitch of a human generated vocal signal. A human vocal signal is received at a first input. A reference signal having correct pitch is received at a second input. The pitch of the human vocal signal is then corrected by shifting the pitch of the human vocal signal to match the pitch of the reference signal, e.g., using pitch shifter circuitry.
Claims12
A method for correcting a pitch of a to-be-corrected human generated vocal signal comprising the steps of:
- (a) receiving a to-be-corrected human vocal signal;
- (b) determining an unknown pitch of the received to-be-corrected human vocal signal and generating a dynamically varying pitch signal which indicates the dynamically varying determined pitch of the to-be-corrected human vocal signal;
- (c) receiving a dynamically varying reference pitch signal which depends on the dynamically varying pitch of a reference signal with correct pitch;
- (d) generating an error signal between the pitch signal and the reference pitch signal;
- and
- (e) correcting a pitch of the received to-be-corrected human vocal signal by shifting only the pitch of the to-be-corrected human vocal signal based on the error signal to match a pitch of the reference signal while preserving a formant of the to-be-corrected human vocal signal.
3 more elements
Apparatus for correcting a pitch of a to-be-corrected human generated vocal signal comprising:
- (a) a first input for receiving a to-be-corrected human vocal signal;
- (b) a second input for receiving a dynamically varying reference pitch signal which depends on the dynamically varying pitch of a reference signal with correct pitch;
- (c) tracker circuitry for determining an unknown pitch of the received to-be-corrected human vocal signal and generating a dynamically varying pitch signal which indicates the dynamically varying determined pitch of the to-be-corrected human vocal signal;
- (d) an adder connected to the tracker circuitry for generating an error between the pitch signal and the reference pitch signal;
- and
- (e) circuitry connected to the first and second inputs for correcting a pitch of the to-be-corrected human vocal signal by shifting only the pitch of the to-be-corrected human vocal signal to match a pitch of the reference signal while preserving a formant of the to-be-corrected human vocal signal.
3 more elements
Dependencies are inferred from the claim text.