Method and apparatus for estimating high-band energy in a bandwidth extension system
View Patent ↗A method ( 100 ) includes receiving ( 101 ) an input digital audio signal comprising a narrow-band signal. The input digital audio signal is processed ( 102 ) to generate a processed digital audio signal. An estimate of the high-band energy level corresponding to the input digital audio signal is determined ( 103 ). Modification of the estimated high-band energy level is done based on an estimation accuracy and/or narrow-band signal characteristics ( 104 ). A high-band digital audio signal is generated based on the modified estimate of the high-band energy level and an estimated high-band spectrum corresponding to the modified estimate of the high-band energy level ( 105 ).
1. A method comprising:
receiving, by a receiver, an input digital audio signal comprising a narrow-band signal;
determining, by a processor coupled to the receiver, an estimated high-band energy level corresponding to the input digital audio signal; and
modifying, by the processor, the estimated high-band energy level based on the narrow-band signal characteristics;
wherein the step of modifying the estimated high-band energy level comprises the step of modifying, by the processor, the estimated high-band energy level based on an occurrence of an onset;
wherein the estimated high-band energy levels of a sequence of K max frames starting at a frame at which the onset has been detected are modified; and
wherein the modifications of the estimated high-band energy levels are stopped before the K max -th frame is reached if a voicing level of a frame within the sequence of K max frames is less than a threshold.
2. An apparatus comprising:
a processor, and
an estimation and control module (ECM) coupled to the processor and receiving an input digital audio signal comprising a narrow-band signal, generating an estimated high-band energy level corresponding to the input digital audio signal, and modifying the estimated high-band energy level based on the narrow-band signal characteristics wherein the step of modifying the estimated high-band energy level comprises the step of modifying the estimated high-band energy level based on an occurrence of an onset, wherein the estimated his h-band energy levels of a sequence of K max frames starting at a frame at witch the onset has been detected are modified, and wherein the modification of the estimated high-band energy levels are stopped before the K max -th frame is reached if a voicing level of a frame within the sequence of K max frames is less than a threshold.
3. A method comprising:
receiving, by a receiver, an input digital audio signal comprising a narrow-band signal;
receiving, by a processor coupled to the receiver, an estimated high-band energy level corresponding to the input digital audio signal; and
modifying, by the processor, the estimated high-band energy level based on the narrow-band signal characteristics;
wherein the step of modifying the estimated high-band energy level comprises the step of modifying the estimated high-band energy level based on an occurrence of an onset;
wherein the estimated high-band energy levels of a sequence of K max frames starting at a frame at which the onset has been detected are modified; and
wherein the modifications of the estimated high-band energy levels are stopped before the K max -th frame is reached if a voicing level of a frame within the sequence of K max frames is less than a threshold.