Method and apparatus for estimating high-band energy in a bandwidth extension system
AssigneeMotorola Mobility LLC
InventorsMark A. Jasiuk, Tenkasi V. Ramabadran
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Abstract
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).
Claims3
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 Kmax 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 Kmax-th frame is reached if a voicing level of a frame within the sequence of Kmax frames is less than a threshold.
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 Kmax 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 Kmax-th frame is reached if a voicing level of a frame within the sequence of Kmax frames is less than a threshold.
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 Kmax 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 Kmax-th frame is reached if a voicing level of a frame within the sequence of Kmax frames is less than a threshold.
Dependencies are inferred from the claim text.