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Audio encoding apparatus and encoding and decoding apparatus

An audio coding and audio technology, which is applied in speech analysis, code conversion, speech synthesis, etc., and can solve problems such as large computational load and large computational load

Inactive Publication Date: 2004-05-26
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since a large amount of computation is required for linear prediction compounding, there is a problem that a considerable amount of computation must be processed for sound source retrieval.

Method used

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  • Audio encoding apparatus and encoding and decoding apparatus
  • Audio encoding apparatus and encoding and decoding apparatus
  • Audio encoding apparatus and encoding and decoding apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Fig. 1 is a block diagram showing the overall configuration of an audio encoding device and an audio decoding device according to Embodiment 1 of the present invention.

[0070] In Fig. 1, each label indicates respectively: 1 is the coder part; 2 is the decoder part; 3 is the multiplexing device; 4 is the separation device; The device part is composed of the following 8, 9 and 25-36 devices; wherein, 8 is a linear prediction parameter analysis device; 9 is a linear prediction parameter encoding device; 15 is a sound source signal generation device; 25 is a tone analysis device , used to extract the pitch period of the input audio; 26 is a delay parameter retrieval area determination device, which is used to determine the retrieval range of the delay parameter required when retrieving the adaptive sound source vector; 27 is an audio input up-sampling device, used for Raise the sampling input audio; 28 is the target audio generating device, which is used to produce a targ...

Embodiment 2

[0099] In the above-mentioned embodiment 1, in the frame sound source generating devices 32, 40 and the second frame sound source generating devices 36 and 43, each cycle L repeats and periodizes the adaptive sound source of the vector length corresponding to the delay parameter L Signal or drive sound source signal, produce the self-adaptive sound source signal of frame length or drive sound source signal; But, for example, can be used as waveform interpolation in every cycle L, for example, carry out waveform interpolation processing by every cycle L, between frames Interpolating the above-mentioned adaptive sound source signal or driving sound source signal with a vector length corresponding to the delay parameter L can also generate the adaptive sound source signal or driving sound source signal well.

[0100] According to the second embodiment of the present invention, by smoothing the change of the sound source signal between frames, the reproducibility of composite audio...

Embodiment 3

[0102] In the above-mentioned embodiments 1 and 2, according to the adaptive sound source signal and the driving sound source signal with a vector length corresponding to the delay parameter L, the frame sound source generating device and the second frame sound source generating device are used to generate a frame The adaptive sound source signal with length L and the driving sound source signal with frame length are added together to generate the sound source signal with frame length; however, the adaptive sound source signal with vector length corresponding to the delay parameter L can be The source signal and the driving sound source signal are added to produce a sound source signal with a vector length corresponding to the delay parameter L; this can be illustrated as follows: according to each cycle L, the above-mentioned signal is repeated and periodicized, Therefore, a sound source signal having a frame length can also be favorably generated.

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Abstract

A speech encoding apparatus capable of averting the deterioration of synthesis speech quality in encoding the input speech and of generating a high-quality synthesis output speech through small quantities of computation. The apparatus comprises: a target speech generation part for generating from the input speech a target speech vector of a vector length corresponding to a delay parameter; an adaptive codebook for generating from previously generated excitation signals an adaptive vector of the vector length corresponding to the delay parameter; an adaptive code search part for evaluating the distortion of a synthesis vector obtained from the adaptive vector with respect to the target speech vector so as to search for the adaptive vector conducive to the least distortion; and a frame code generation part for generating an excitation signal of a frame length from the adaptive vector conducive to the least distortion.

Description

technical field [0001] The invention relates to an audio encoding device and an audio encoding and decoding device, the set of devices can compress and encode audio signals into digital signals. Background technique [0002] Figure 9 It is a typical overall block diagram of an ordinary audio coding and decoding device, which divides the audio input signal into spectrum envelope information and sound source signal information, and encodes the sound source signal in units of frames. Figure 9 The device shown is the same as that disclosed in JP-A 64 / 40899. [0003] exist Figure 9 Here, the labels are: 1 Encoding device, 2 Decoding device, 3 Multiplexing device, 4 Separating device, 5 Audio input, 6 Transmission line, 7 Audio output. The coding device 1 is composed of a linear prediction parameter analysis device 8, a linear prediction parameter coding device 9, an adaptive sound source signal codebook 10, an adaptive sound source retrieval device 11, an error signal generati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/038G10L19/04G10L19/08G10L19/09G10L19/12H03M7/30
CPCG10L19/08G10L2019/0011G10L13/00
Inventor 山浦正田崎裕久高桥真哉
Owner MITSUBISHI ELECTRIC CORP
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