System for bandwidth extension of narrow-band speech
View Patent ↗A system, computer-readable medium and generated signal are disclosed for extending the bandwidth of a first signal (i.e., a narrowband signal) such as a speech signal. The system produces a second signal from a first signal by computing first area coefficients from a first signal, generating second area coefficients from the first area coefficients and generating a second signal using the second area coefficients. The first signal may be a narrowband signal and second signal may be a wideband signal. The first area coefficients may be narrowband coefficients and the second area coefficients may be wideband area coefficients.
1. A system for producing a second signal from a first signal in a telephone communications network, the system comprising:
a module that computes first area coefficients from a first signal;
a module that generates second area coefficients from the first area coefficients; and
a module that generates a second signal using the second area coefficients.
2. The system of claim 1 , wherein the first signal is a narrowband signal and second signal is a wideband signal.
3. The system of claim 2 , wherein first area coefficients are narrowband coefficients and the second area coefficients are wideband area coefficients.
4. The system of claim 1 , wherein the module that generates the second signal further generates the second signal by combining the second signal with the first signal interpolated to a second signal sampling rate.
5. The system of claim 4 , wherein the first signal is a narrowband signal and second signal is a wideband signal.
6. The system of claim 1 , wherein the module that generates second area coefficients from the first area coefficients generates the second area coefficients using interpolation.
7. The system of claim 1 , wherein the module that computes first area coefficients from a first signal computes the first area coefficients using partial correlation coefficients (parcors) from the first signal.
8. A computer-readable medium storing instructions for controlling a computer device to produce a second signal from a first signal in a telephone communications network according to the following method;
computing first area coefficients from a first signal;
generating a second signal area coefficients from the first area coefficients; and
generating a second signal using the second area coefficients.
9. The computer-readable medium of claim 8 , wherein the first signal is a narrowband signal and second signal is a wideband signal.
10. The computer-readable medium of claim 9 , wherein first coefficients are narrowband coefficient sand the second area coefficients are wideband area coefficients.
11. The computer-readable medium of claim 8 , wherein generating the second signal further comprises generating the second signal by combining the second signal; with the first signal interpolated to a second signal sampling rate.
12. The computer-readable medium of claim 11 , wherein the first signal is a narrowband and signal and second signal is a wideband signal.
13. The computer-readable medium of claim 8 , wherein generating second area coefficients from the first area coefficients further comprises generating the second area coefficients using interpolation.
14. The computer-readable medium of claim 8 , wherein computing first area coefficients from signal further comprises computing the first area coefficients using partial correlation coefficients (parcors) from the first signal.
15. A method of processing a first signal in a telephone communications network, the method comprising:
computing first area coefficients from a first signal;
generating second area coefficients from the first area coefficients; and
generating a second signal using the second area coefficients.
16. The method of claim 15 , wherein the first signal is a narrowband signal and second signal is a wideband signal.
17. The method of claim 16 , wherein first area coefficients are narrowband coefficients and the second area coefficients are wideband area coefficients.
18. The method of claim 15 , wherein generating the second signal further comprises generating the second signal by combining the second signal with the first signal interpolated to a second signal sampling rate.
19. The method of claim 15 , wherein generating second area coefficients from the first area coefficients further comprises generating the second area coefficients using interpolation.
20. The method of claim 15 , wherein computing first area coefficients from a first signal further comprises computing the first area coefficients using partial correlation coefficients (parcors) from the first signal.