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Scalable encoding device, scalable decoding device, method thereof, and scalable coding device

A technology for expanding encoding and decoding devices, which is applied in the field of scalable encoding devices, can solve problems such as inability to obtain high conversion efficiency, and achieve the effect of improving conversion performance and high performance

Active Publication Date: 2012-03-14
III HLDG 12 LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the transformation represented by (Equation 1) cannot obtain high transformation efficiency (if it is regarded as predicting wideband LSP from narrowband LSP, it can also be said to be prediction accuracy), and the wideband LSP encoder designed based on (Equation 1) has a significant impact on coding performance. a lot of room for improvement

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  • Scalable encoding device, scalable decoding device, method thereof, and scalable coding device
  • Scalable encoding device, scalable decoding device, method thereof, and scalable coding device
  • Scalable encoding device, scalable decoding device, method thereof, and scalable coding device

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Embodiment approach 1

[0049] Fig. 4 is a block diagram showing the main configuration of the scalable coding apparatus according to Embodiment 1 of the present invention.

[0050] The scalable encoding device in this embodiment includes: a downsampling unit 101, an LSP analysis unit (for narrowband) 102, a narrowband LSP encoding unit 103, a sound source encoding unit (for narrowband) 104, a phase correction unit 105, an LSP analysis unit (for wideband) (for wideband) 106 , wideband LSP coding section 107 , sound source coding section (for wideband) 108 , transform coefficient calculation section 109 , upsampling section 110 , adder 111 , and multiplexing section 112 .

[0051] Each part of the scalable encoding device of this embodiment performs the following operations.

[0052] Downsampling section 101 performs downsampling processing on an input speech signal, and outputs the narrowband signal to LSP analysis section (for narrowband) 102 and sound source coding section (for narrowband) 104 . I...

Embodiment approach 2

[0120] In Embodiment 1, when the calculated transform coefficient fluctuates greatly, correction is performed so that the transform coefficient falls within a certain range, thereby stably performing prediction when predicting the wideband LSP from the narrowband LSP. In this embodiment, focusing on the quantized LSP parameters, by observing the changes of the quantized LSP parameters, it is judged whether there is a change in the LSP parameters, and the transform coefficients used for transform are switched.

[0121] Specifically, focusing on the narrowband quantized LSP parameters obtained by the narrowband LSP encoding unit at the encoding end or the narrowband LSP decoding unit at the decoding end, when the narrowband quantized LSP parameters do not change, it is determined as a stable mode, and the narrowband quantized LSP parameters When there is a change, it is judged as an unstable mode, and according to the judgment result of this mode, the LSP codebook and the weighti...

Embodiment approach 3

[0138] In Embodiment 2, changes in narrowband quantized LSP parameters are observed, and the presence or absence of changes in LSP parameters is determined (mode determination). However, sometimes the wideband quantized LSP parameters fluctuate when the narrowband quantized LSP parameters do not fluctuate.

[0139] Furthermore, since the current frame is decoded on the basis of the previous mode determination result at the decoding end, in the method of Embodiment 2, if the previous mode determination makes an error, the error will be propagated to subsequent processing.

[0140] Therefore, in this embodiment, a new mode determination unit that uses broadband LSP parameters for mode determination is newly installed at the encoding end, and the obtained mode determination result is sent to the decoding end. A mode decoding unit for decoding the mode determination result is newly provided at the decoding end.

[0141] Hereinafter, this embodiment will be specifically described ...

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Abstract

There is disclosed a scalable encoding device capable of increasing the conversion performance from a narrow-band LSP to a wide-band LSP (prediction accuracy when predicting the wide-band LSP from the narrow-band LSP) and realizing a high-performance band scalable LSP encoding. The device includes a conversion coefficient calculation unit (109) for calculating a conversion coefficient by using a narrow-band quantization LSP which has been outputted from a narrow-band LSP encoding unit (103) and a wide-band quantization LSP which has been outputted from a wide-band LSP encoding unit (107). Thewide-band LSP encoding unit (107) multiplies the narrow-band quantization LSP with the conversion coefficient inputted from the conversion coefficient calculation unit (109) so as to convert it into a wide-band LSP. The wide-band LSP is multiplied by a weight coefficient to calculate a prediction wide-band LSP. The wide-band LSP encoding unit (107) encodes an error signal between the obtained prediction wide-band LSP and the wide-band LSP so as to obtain a wide-band quantization LSP.

Description

technical field [0001] The present invention relates to a scalable encoding device, a scalable decoding device, a scalable encoding method, and a scalable decoding method used for speech communication in a mobile communication system or a packet communication system using the Internet protocol. Background technique [0002] In voice communication using packets such as VoIP (Voice over IP), a coding method that is resistant to frame loss is desired in coding voice data. This is because, in packet communication typified by Internet communication, packets may be lost on the transmission path due to congestion or the like. [0003] As one of methods of improving frame loss resistance, there is a method of minimizing the influence of frame loss by performing decoding processing on other part even if a part of transmission information is lost (for example, refer to Patent Document 1). Patent Document 1 discloses a method of transmitting core layer coded information and enhancemen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/14G10L19/16G10L19/02
CPCG10L19/07G10L19/24H04L25/49H04L25/20
Inventor 江原宏幸吉田幸司
Owner III HLDG 12 LLC
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