Method and Apparatus for Processing Audio Frames to Transition Between Different Codecs
First Claim
1. A method for processing audio frames comprising:
- producing, using a first coding method, a first frame of coded output audio samples by coding a first audio frame in a sequence of frames wherein the coded output audio samples are sampled at a first sampling rate;
forming an overlap-add portion of the first frame using the first coding method;
generating a combination first frame of coded audio samples based on combining the first frame of coded output audio samples with the overlap-add portion of the first frame;
initializing a state of a second coding method based on the combination first frame of coded audio samples; and
constructing an output signal based on the initialized state of the second coding method.
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Accused Products
Abstract
A method (700, 800) and apparatus (100, 200) processes audio frames to transition between different codecs. The method can include producing (720), using a first coding method, a first frame of coded output audio samples by coding a first audio frame in a sequence of frames. The method can include forming (730) an overlap-add portion of the first frame using the first coding method. The method can include generating (740) a combination first frame of coded audio samples based on combining the first frame of coded output audio samples with the overlap-add portion of the first frame. The method can include initializing (760) a state of a second coding method based on the combination first frame of coded audio samples. The method can include constructing (770) an output signal based on the initialized state of the second coding method.
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Citations
26 Claims
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1. A method for processing audio frames comprising:
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producing, using a first coding method, a first frame of coded output audio samples by coding a first audio frame in a sequence of frames wherein the coded output audio samples are sampled at a first sampling rate; forming an overlap-add portion of the first frame using the first coding method; generating a combination first frame of coded audio samples based on combining the first frame of coded output audio samples with the overlap-add portion of the first frame; initializing a state of a second coding method based on the combination first frame of coded audio samples; and constructing an output signal based on the initialized state of the second coding method. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for processing audio frames comprising:
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producing, using a first decoding method, a first frame of decoded output audio samples by decoding a bitstream frame in a sequence of frames wherein the decoded output audio samples are sampled at a first sampling rate; forming an overlap-add portion of the first frame using the first decoding method; generating a combination first frame of decoded audio samples based on combining the first frame of decoded output audio samples with the overlap-add portion of the first frame; initializing a state of a second decoding method based on the combination first frame of decoded audio samples; and constructing an output signal based on the initialized state of the second decoding method. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus for processing audio frames comprising:
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a first coder configured to produce, using a first coding method, a first frame of coded output audio samples by coding a first audio frame in a sequence of frames wherein the coded output audio samples are sampled at a first sampling rate, the first coder also configured to form an overlap-add portion of the first frame using the first coding method; a transition audio combiner configured to generate a combination first frame of coded audio samples based on combining the first frame of coded output audio samples with the overlap-add portion of the first frame; a second coder state generator configured to initialize a state of a second coding method based on the combination first frame of coded audio samples; and a second coder configured to construct an output signal based on the initialized state of the second coding method. - View Dependent Claims (20, 21, 22)
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23. An apparatus for processing audio frames comprising:
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a first decoder configured to produce, using a first decoding method, a first frame of decoded output audio samples by decoding a bitstream frame in a sequence of frames wherein the decoded output audio samples are sampled at a first sampling rate, the first decoder also configured to form an overlap-add portion of the first frame using the first decoding method; a transition audio combiner configured to generate a combination first frame of decoded audio samples based on combining the first frame of decoded output audio samples with the overlap-add portion of the first frame; a second decoder state generator configured to initialize a state of a second decoding method based on the combination first frame of decoded audio samples; and a second decoder configured to construct an output signal based on the initialized state of the second decoding method. - View Dependent Claims (24, 25, 26)
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Specification