Systems and methods of performing noise modulation and gain adjustment
First Claim
1. A method of synthesizing a high-band signal in an electronic device, the method comprising:
- receiving a first value of a mixing factor, the first value corresponding to a first portion of an audio signal received at an audio coder of the electronic device;
receiving a second value of the mixing factor, the second value corresponding to a second portion of the audio signal;
generating a third value of the mixing factor at least partially based on the first value, the second value, and an indication of a coding type corresponding to the audio signal; and
generating a high-band excitation signal based on an excitation signal, modulated noise, and the third value of the mixing factor, wherein a gain value corresponding to at least a portion of the audio signal is used to generate a synthesized high-band signal based on the high-band excitation signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A method includes receiving a first value of a mixing factor. The first value corresponds to a first portion of an audio signal received at an audio encoder. The method includes receiving a second value of the mixing factor. The second value corresponds to a second portion of the audio signal. The method also includes generating a third value of the mixing factor at least partially based on the first value and the second value and mixing an excitation signal with modulated noise based on the third value. Another method includes determining a first set of spectral frequency values corresponding to an audio signal and determining a second set of spectral frequency values that approximates the first set of spectral frequency values. A gain value corresponding to at least a portion of the audio signal is adjusted based on a difference between the first set and the second set.
13 Citations
49 Claims
-
1. A method of synthesizing a high-band signal in an electronic device, the method comprising:
-
receiving a first value of a mixing factor, the first value corresponding to a first portion of an audio signal received at an audio coder of the electronic device; receiving a second value of the mixing factor, the second value corresponding to a second portion of the audio signal; generating a third value of the mixing factor at least partially based on the first value, the second value, and an indication of a coding type corresponding to the audio signal; and generating a high-band excitation signal based on an excitation signal, modulated noise, and the third value of the mixing factor, wherein a gain value corresponding to at least a portion of the audio signal is used to generate a synthesized high-band signal based on the high-band excitation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. An apparatus for synthesizing a high-band signal in an electronic device, the apparatus comprising:
-
a filter configured to generate a third value of a mixing factor at least partially based on a first value of the mixing factor, a second value of the mixing factor, and an indication of a coding type corresponding to an audio signal received at the electronic device, wherein the first value corresponds to a first portion of the audio signal and wherein the second value corresponds to a second portion of the audio signal; a mixer configured to receive the third value and to generate a high-band excitation signal corresponding to a high-band portion of the audio signal by generating modulated noise and combining the modulated noise and a transformed version of a low-band excitation signal, the low-band excitation signal corresponding to a low-band portion of the audio signal, wherein the mixer is configured to combine the modulated noise and the transformed version of the low-band excitation signal based on the third value; and a gain circuit configured to determine a gain value corresponding to at least a portion of the audio signal, the gain value usable to generate a synthesized high-band signal based on the high-band excitation signal. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
-
-
40. An apparatus for synthesizing a high-band signal in an electronic device, the apparatus comprising:
-
means for generating a third value of a mixing factor at least partially based on a first value of the mixing factor, a second value of the mixing factor, and an indication of a coding type corresponding to an audio signal, wherein the first value corresponds to a first portion of the audio signal received at an audio coder of the electronic device and wherein the second value corresponds to a second portion of the audio signal; means for generating a high-band excitation signal corresponding to a high-band portion of the audio signal by combining modulated noise and a transformed version of a low-band excitation signal, the low-band excitation signal corresponding to a low-band portion of the audio signal, wherein the means for generating is configured to combine the modulated noise and the transformed version of the low-band excitation signal based on the third value; and means for determining a gain value corresponding to at least a portion of the audio signal, the gain value usable to generate a synthesized high-band signal based on the high-band excitation signal. - View Dependent Claims (41, 42, 43, 44, 45)
-
-
46. A non-transitory computer-readable medium comprising instructions that, when executed by a computer in an electronic device configured to synthesize a high-band signal, cause the computer to:
-
receive a first value of a mixing factor, the first value corresponding to a first portion of an audio signal received at an audio coder of the electronic device; receive a second value of the mixing factor, the second value corresponding to a second portion of the audio signal; generate a third value of the mixing factor at least partially based on the first value, the second value, and an indication of a coding type corresponding to the audio signal; and generate a high-band excitation signal based on an excitation signal, modulated noise, and the third value of the mixing factor, wherein a gain value corresponding to at least a portion of the audio signal is usable to generate a synthesized high-band signal based on the high-band excitation signal. - View Dependent Claims (47, 48, 49)
-
Specification