Audio signal decoding device and audio signal encoding device
A technology of audio signal and decoding device, which is applied in the field of coding device, and can solve problems such as inability to obtain sound quality
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Embodiment approach 1
[0082] The embodiments shown below are merely examples of various progressive principles of the present invention, and those in the industry can easily understand that various changes can be added to the detailed description shown below. Accordingly, the present invention is to be limited only by the scope of the appended claims, and not by the following detailed specific examples.
[0083] Also, although an example of binaural-mono is given here, the present invention is not limited to the above. This can be generalized with M original channels and N downmix channels.
[0084] FIG. 3 is a block diagram showing the configuration of an encoding device according to Embodiment 1. FIG. Fig. 3 shows the encoding process related to the present invention. The encoding device of this embodiment includes: a transform module 100, a downmix module 102, two energy envelope analyzers 104 for L(t, f) and R(t, f), and calculate the inter-channel Module 106 for phase sequence IPDL(b), modu...
Embodiment approach 2
[0144] Embodiment 2 relates to the energy envelope analysis module (104) shown in FIG. 3 . In the example of the segmentation method shown in FIG. 2 , the acoustic psychological characteristics of the ear cannot be utilized. Therefore, in this embodiment, as shown in FIG. 4 , the characteristic of the ear that is low in sensitivity to high-frequency sounds is used to finely segment low frequencies and lower the accuracy of segmentation for high frequencies.
[0145] To achieve this, the frequency band of L(t,f) is further divided into "bands" (402). FIG. 4 shows three frequency bands from frequency band 0 (402) to frequency band 2 (404). For example, the high-frequency segment can only have one boundary (404) at most, and the frequency segment is divided into two parts according to this. In order to further save the number of bits, it is not allowed to divide the frequency segment of the highest frequency. In such cases, the well-known "intensity stereo" of the prior art is...
Embodiment approach 3
[0149]In the case of a high bit rate, simply using the reverberation signal to derive a multi-channel signal cannot obtain the transparency expected at a high bit rate. Therefore, in Embodiment 3, the differential signals Llf(t) and Rlf(t) subjected to non-fine quantization and the downmix signal are encoded separately and then sent to the decoding device, and the audio channel signals and The deviation of the original sound channel signal is corrected by the decoding means. Fig. 6 is a block diagram showing the configuration of a decoding device according to Embodiment 3. In the same figure, the part surrounded by the dotted line is the signal separation part, which uses the Lreverb and Rreverb obtained by premixing in the mixer 1 (322, 324) to adjust the phase of the premixed channel signal in the reverberation generation The separation is performed from the downmix signal in a processor (302). This decoding device includes: the above-mentioned signal separation part, tran...
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