Scalable encoding device, and scalable encoding method
一种扩展编码、编码的技术，应用在可扩展编码装置领域，能够解决丢失通信数据等问题，达到削减电路规模的效果
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Embodiment approach 1
[0028] FIG. 1 is a block diagram showing the main configuration of a scalable coding apparatus 100 according to Embodiment 1 of the present invention. In addition, here, the case of encoding a stereo audio signal composed of two channels is taken as an example for description, and the first channel and the second channel shown below represent L channel and R channel respectively, or other Opposite channel.
[0029] Scalable encoding device 100 includes: adder 101, multiplier 102, monophonic encoding unit 103 and stereophonic encoding unit 104, and adder 101, multiplier 102 and monophonic encoding unit 103 constitute the basic layer, stereo encoding unit 104 constitute the extension layer.
[0030] Each part of the scalable encoding device 100 performs the following operations.
[0031] The adder 101 adds the first channel signal CH1 and the second channel signal CH2 input to the scalable encoding device 100 to generate a sum signal. The multiplier 102 multiplies the sum sig...
Embodiment approach 2
[0073] The "first channel" and "second channel" used in Embodiment 1 are specifically R channel or L channel in a stereo signal. In Embodiment 1, the case where the first channel and the second channel correspond to either the R channel or the L channel is not particularly limited, and may correspond to either one. However, if the first channel is limited to a specific channel by the method described below, that is, one of the R channel and the L channel is selected as the first channel, the encoding performance of the scalable encoding device can be further improved .
[0074] Fig. 6 is a block diagram showing a main configuration of an extension layer of a scalable encoding device according to Embodiment 2 of the present invention. In addition, the same components as those of the scalable coding apparatus shown in Embodiment 1 are given the same reference numerals, and their descriptions are omitted.
[0075] For the first channel signal, LPC analysis is performed in the L...
Embodiment approach 3
[0085] Embodiment 3 of the present invention discloses a method of changing bit allocation in the scalable encoding device of the present invention.
[0086] In general, the more coding bits are allocated to the coding process, the more coding distortion is reduced. For example, since the scalable encoding device of the present invention performs encoding of the first channel signal and encoding of the second channel signal, if the encoding bits allocated to both the first channel and the second channel can be increased, the Both the encoding distortion of the first channel and the encoding distortion of the second channel. However, in reality, there is an upper limit to the sum of the number of bits allocated to the first channel and the number of bits allocated to the second channel. Therefore, if the number of bits allocated to the first channel increases, although the encoding distortion of the first channel signal decreases, the encoding distortion of the second channel ...
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