Bandwidth extension of narrowband speech
First Claim
Patent Images
1. A system that extends the bandwidth of a narrowband speech signal comprising:
- a high-band generator that generates a high frequency spectrum based on a narrowband spectrum;
a background noise generator that generates a high frequency background noise spectrum based on a background noise within the narrowband spectrum; and
a summer coupled to the high-band generator and background noise generator that combines the high frequency band and narrowband spectrum with high frequency background noise spectrum.
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Abstract
A system extends the bandwidth of a narrowband speech signal into a wideband spectrum. The system includes a high-band generator that generates a high frequency spectrum based on a narrowband spectrum. A background noise generator generates a high frequency background noise spectrum based on a background noise within the narrowband spectrum. A summing circuit linked to the high-band generator and the background noise generator combines the high frequency spectrum and narrowband spectrum and the high frequency background noise spectrum.
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Citations
27 Claims
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1. A system that extends the bandwidth of a narrowband speech signal comprising:
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a high-band generator that generates a high frequency spectrum based on a narrowband spectrum; a background noise generator that generates a high frequency background noise spectrum based on a background noise within the narrowband spectrum; and a summer coupled to the high-band generator and background noise generator that combines the high frequency band and narrowband spectrum with high frequency background noise spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system that extends the bandwidth of a narrowband speech signal comprising:
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a spectrum extractor that obtains a narrowband speech spectrum from a narrowband spectrum; a convolver configured to generate a high frequency spectrum by convolving the narrowband speech spectrum with itself; a high frequency envelope generator configured to generate a high frequency spectral envelope from the narrowband spectrum; a spectral envelope extender that estimates a high frequency background noise based on the narrowband spectrum; and a summer configured to combine the narrowband spectrum, the high frequency spectrum, and the high frequency background noise. - View Dependent Claims (16, 17, 18, 19)
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20. A method of extending a narrowband speech signal into a wideband signal comprising:
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extracting a narrowband spectrum that lies above a background noise band spectrum; extending the narrowband spectrum into a high frequency band spectrum; generating a high frequency band spectral envelope; adjusting a portion of the energy of the high frequency band spectrum to a portion of the energy in the narrowband spectrum; generating a high frequency background noise spectrum; and adding the adjusted high frequency band spectrum to the narrowband spectrum and the generated background noise spectrum. - View Dependent Claims (22, 23, 24, 25)
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21. The method of 20 where the act of extending the narrowband spectrum comprises convolving the narrowband spectrum with itself.
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26. A system that extends the bandwidth of a narrowband speech signal comprising:
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a high-band generator that generates a high frequency spectrum based on a narrowband spectrum; a background noise envelope extractor that determines a background noise envelope of the narrowband spectrum; a background noise envelope extender that generates a high frequency background noise spectrum from the background noise envelope of the narrowband spectrum; and a summer configured to combine the high frequency spectrum, the narrowband spectrum, and the high frequency background noise spectrum. - View Dependent Claims (27)
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Specification