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Hybrid audio signal encoder, hybrid audio signal decoder, method for encoding audio signal, and method for decoding audio signal
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A sound signal, mixed coding technology, applied in instruments, speech analysis, code conversion, etc., can solve the problems of increased switching frequency and increased frequency of AC signals.
Active Publication Date: 2014-01-29
PANASONIC CORP
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[0015] However, when the size of the frame is reduced, the switching frequency of the frame is relatively increased, and the frequency of occurrence of the AC signal is also naturally increased.
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Embodiment approach 1
[0182] In Embodiment 1, an audio signal hybrid encoder will be described.
[0183] Figure 4 It is a block diagram showing the configuration of the audio signal hybrid encoder according to the first embodiment.
[0184] The audio signal hybrid encoder 100 includes an LD (Low Delay) analysis filter bank 400 , an MPS encoder 401 , an SBR encoder 402 , an LD synthesis filter bank 403 , a signal analysis unit 404 , and a switching unit 405 . Furthermore, the audio signal hybrid encoder 100 includes an audio encoder 406 (hereinafter simply referred to as an MDCT encoder 406 ) using an MDCT filter bank, an LP encoder 408 , and a TCX encoder 410 . Furthermore, the audio signal hybrid encoder 100 includes a plurality of quantizers 407 , 409 , 411 , 414 , 416 , and 417 , a bit streammultiplexer (bit streammultiplexer) 415 , a local decoder 412 , and an AC signal generation unit 413 .
[0185] The LD analysis filter bank 400 generates an input subband signal represented by a mixed t...
Embodiment approach 2
[0266] In Embodiment 2, an audio signal hybrid decoder will be described.
[0267] Figure 10 It is a block diagram showing the configuration of the audio signal hybrid decoder according to the second embodiment.
[0268] The audio signal hybrid decoder 200 includes an LD analysis filter bank 503 , an LD synthesis filter bank 500 , an MPS decoder 501 , an SBR decoder 502 , and a switching unit 505 . In addition, the audio signal hybrid decoder 200 includes an audio decoder 506 using an IMDCT filter bank (hereinafter simply referred to as an IMDCT decoder 506 ), an LP decoder 508 , a TCX decoder 510 , inverse quantizers 507 , 509 , 511 , 514, 516, and 517, a bit streamdemultiplexer (bit stream demultiplexer) 515, and an AC output signal generation unit.
[0269] The bitstreamdemultiplexer 515 selects one of the IMDCT decoder 506, the LP decoder 508, and the TCX decoder, and the corresponding inverse quantizer 507 based on the core coder indicator of the bitstream , 1 inver...
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Abstract
A hybridaudio signalencoder (100) comprises: a signal analysis unit (404) for determining the encoding method for a frame included in an audio signal; LFD encoders (406, 410) for encoding a frame to generate an LFD frame; an LP encoder (408) for encoding a frame to generate an LP frame; a switching unit (405) for switching encoders in accordance with the determination result by the signal analysis unit (404); and an AC signal generation unit (413) for generating and outputting an AC signal in accordance with a method selected from a plurality of methods, and outputting an AC flag indicative of the selected method.
Description
technical field [0001] The present invention relates to an audio signalhybridencoder and an audio signal hybrid decoder capable of switching codecs. Background technique [0002] A hybrid codec (hybrid codec) is a codec that combines the advantages of an audio codec (audio codec) and a speech codec (speech codec). According to the mixed codec, it is possible to encode an audio signal obtained by mixing the content of the main body of the voice signal and the content of the main body of the audio signal by switching between the audio codec and the voice codec, and encoding it with an encoding method suitable for each . Therefore, according to the hybrid codec, stable audio signal compression coding can be realized at a low bit rate. [0003] Also, in hybrid codecs, in order to suppress aliasing (aliasing) that occurs in codec switching sections, a method of generating an AC (Aliasing Cancel) signal on the encoding side is known. [0004] prior art literature [0005] no...
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