Speech bandwidth extension
First Claim
1. A method of generating a wide-band speech signal from a first narrow-band speech signal, the method comprising:
- analyzing the first narrow-band speech signal to generate one or more parameters;
synthesizing a lower frequency-band signal based on at least one of the one or more parameters; and
combining the synthesized lower frequency-band signal with a second narrow-band speech signal that is derived from the first narrow-band speech signal, wherein;
the one or more parameters include a pitch frequency parameter; and
synthesizing the lower frequency-band signal based on at least one of the one or more parameters comprises generating continuous sine tones that are based on the pitch frequency parameter.
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Abstract
A common narrow-band speech signal is expanded into a wide-band speech signal. The expanded speech signal gives the impression of a wide-band speech signal regardless of what type of vocoder is used. Extending the narrow-band speech signal into a lower range involves analyzing the narrow-band speech signal to generate one or more parameters, and synthesizing a lower frequency-band signal based on at least one of the one or more parameters. The synthesized lower frequency-band signal is then combined with a signal that is derived from (e.g., via up-sampling) the narrow-band speech signal. In preferred embodiments, a pitch frequency parameter is generated, and generation of the lower frequency-band signal includes generating continuous sine tones that are frequency shifted with the pitch frequency parameter.
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Citations
20 Claims
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1. A method of generating a wide-band speech signal from a first narrow-band speech signal, the method comprising:
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analyzing the first narrow-band speech signal to generate one or more parameters;
synthesizing a lower frequency-band signal based on at least one of the one or more parameters; and
combining the synthesized lower frequency-band signal with a second narrow-band speech signal that is derived from the first narrow-band speech signal, wherein;
the one or more parameters include a pitch frequency parameter; and
synthesizing the lower frequency-band signal based on at least one of the one or more parameters comprises generating continuous sine tones that are based on the pitch frequency parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for generating a wide-band speech signal from a first narrow-band speech signal, the apparatus comprising:
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logic that analyzes the first narrow-band speech signal to generate one or more parameters;
logic that synthesizes a lower frequency-band signal based on at least one of the one or more parameters; and
logic that combines the synthesized lower frequency-band signal with a second narrow-band speech signal that is derived from the first narrow-band speech signal, wherein;
the one or more parameters include a pitch frequency parameter; and
the logic that synthesizes the lower frequency-band signal based on at least one of the one or more parameters comprises logic that generates continuous sine tones that are based on the pitch frequency parameter. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification