High-frequency bandwidth extension in the time domain
First Claim
Patent Images
1. A system that extends the high-frequency spectrum of a narrowband audio signal in the time domain:
- an interface configured to receive a narrowband audio signal;
a controller that extends the harmonics of vowels by introducing a non linearity in the received narrowband audio signal in the time domain; and
a random noise generator that generates consonants by introducing random-noise in the received narrowband audio signal in the time domain.
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Abstract
A system extends the high-frequency spectrum of a narrow band audio signal in the time domain. The system extends the harmonics of vowels by introducing a non linearity in a narrow band signal. Extended consonants are generated by a random-noise generator. The system differentiates the vowels from the consonants by exploiting predetermined features of a speech signal.
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Citations
20 Claims
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1. A system that extends the high-frequency spectrum of a narrowband audio signal in the time domain:
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an interface configured to receive a narrowband audio signal; a controller that extends the harmonics of vowels by introducing a non linearity in the received narrowband audio signal in the time domain; and a random noise generator that generates consonants by introducing random-noise in the received narrowband audio signal in the time domain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system that extends the high-frequency spectrum of an audio signal in the time domain:
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an interface configured to receive a narrowband audio signal; means that extends the harmonics of vowels by introducing a non linearity in the received narrowband audio signal in the time domain; means that generates consonants by introducing random-noise in the received narrowband audio signal in the time domain; and means for summing the non linearity, the random noise, and the narrowband audio signal.
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14. A method that extends a high-frequency spectrum of a narrowband signal comprising:
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determining if a portion of a signal represents a vowel or a consonant; generating a first portion of a high frequency spectrum in a time domain by squaring a portion of a narrow band signal if the that portion of the narrowband signal represents the vowel; generating a second portion of the high frequency spectrum in the time domain by generating a random signal if the portion of the narrowband signal represents the consonant; and filtering the generated high frequency signals to adjust spectral shapes and magnitude. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification