The present invention teaches a new audio coding system that can code both general audio and speech signals well at low bit rates. A proposed audio coding system comprises linear prediction unit for filtering an input signal based on an adaptive filter; a transformation unit for transforming a frame of the filtered input signal into a transform domain; and a quantization unit for quantizing the transform domain signal. The quantization unit decides, based on input signal characteristics, to encode the transform domain signal with a model-based quantizer or a non-model-based quantizer. Preferably, the decision is based on the frame size applied by the transformation unit.

Audio encoder and decoder

[Problem] To allow appropriately carrying out automatic switching of shutter glasses modes when receiving and carrying out image display of a multiplexed stream wherein a first video stream wherein two-dimensional image data is inserted and a second video stream wherein three-dimensional image data is inserted are included in a time-division manner. [Solution] First-out information which is acquired from a transport stream is inserted on the transmission side with a margin of a time (T) for a timing of switching between the first video stream and the second video stream. A shutter mode switch command is transmitted from a shutter control unit to the shutter glasses on the basis of the first-out information and at a timing prior to a shutter mode switch timing. On the basis of the shutter mode switch command, the shutter mode is switched in the shutter glasses at the timing of a switch from a three-dimensional image display to a two-dimensional image display.

Transmission device, transmission method, receiving device, and receiving method

A quantizing apparatus is provided that includes a quantization path determiner that determines a path from a first path not using inter-frame prediction and a second path using the inter-frame prediction, as a quantization path of an input signal, based on a criterion before quantization of the input signal; a first quantizer that quantizes the input signal, if the first path is determined as the quantization path of the input signal; and a second quantizer that quantizes the input signal, if the second path is determined as the quantization path of the input signal.

Apparatus for quantizing linear predictive coding coefficients, sound encoding apparatus, apparatus for de-quantizing linear predictive coding coefficients, sound decoding apparatus, and electronic device therefore

The document relates to audio signal processing, in particular to a system and a corresponding method for improving an audio signal of an FM stereo radio receiver, in this context, one aspect relates to the estimation of noise in a received side signal and the compensation of such noise in parametric stereo parameters. A system for generating a parametric stereo parameter from a two-channel audio signal is described. The two-channel audio signal is presentable as a mid signal and side signal representative of a corresponding left and right audio signal. The system comprises a noise estimation stage configured to determine an impact factor characteristic for the noise of the side signal; and a parametric stereo parameter estimation stage configured to determine the parametric stereo parameter; wherein the determining is based on the two-channel audio signal and the impact factor.

Reduction of spurious uncorrelation in fm radio noise

In one aspect, the invention provides an audio encoding method characterized by a decision being made as to whether the device which will decode the resulting bit stream should apply post filtering including attenuation of interharmonic noise. Hence, the decision whether to use the post filter, which is encoded in the bit stream, is taken separately from the decision as to the most suitable coding mode. In another aspect, there is provided an audio decoding method with a decoding step followed by a post-filtering step, including interharmonic noise attenuation, and being characterized in a step of disabling the post filter in accordance with post filtering information encoded in the bit stream signal. Such a method is well suited for mixed-origin audio signals by virtue of its capability to deactivate the post filter in dependence of the post filtering information only, hence independently of factors such as the current coding mode.

Selective bass post filter

The embodiment of the invention provides an embedded coding method, an embedded decoding method, a coder, a decoder and a system, the decoding method comprises the following steps of: performing an algebraic code excitation linear prediction ACELP coding to a voice signal to obtain a code stream of an ACELP layer; performing transform domain coding to the voice signal to obtain the code stream of a transform domain layer. Because the ACELP coding excites the signal through gradual thinning, the coding signal with lower code rate is corresponding to the excitation signal comprising less algebraic pulses; along with the rise of the code rate, the manner increasing the algebraic pulses gradually thins the excitation signal ceaselessly, when the algebraic pulses are increased to a certain number, the thinning effect to the excitation signals is inconspicuous or weaker, therefore the embodiment of the invention uses the united coding manners of the ACELP and transform domain coding to obtain the embedded code stream, and uses the transform domain coding to compensate the ACELP coding, guaranteeing the quality of synthesis voice.

Embedded type coding, decoding method, encoder, decoder as well as system

The embodiment of the invention provides a frame erasure hiding method and a frame erasure system for an embedded voice coding, the method uses a voice signal interpolation of the received frame before losing the frame to obtain each parameter of the losing frame comprising a line spectrum frequency parameter and an excitation, and obtains the synthesis voice of the losing frame according to the line spectrum frequency parameter and the excitation recovery, the step of obtaining a self-adaptive code book in the excitation is to, according to speed rate of the former non-losing frame of the losing frame, select different excitation interpolations to obtain the self-adaptive book of the losing frame When the frame erasure is hidden, the interpolation excitation used for recovering the self-adaptive book of the losing frame is selected according to the former non-losing frame so that the obtained self-adaptive book is more close to an initial coding signal of the losing frame, thus improving the quality of frame erasure hiding

Frame erase concealing method and system for embedded type speech encoding

The invention discloses a method and a device for encoding and decoding embedded voice or a voice-frequency signal, belonging to the encoding technology and aiming at solving the problem that a signalfrequency band processed by the prior embedded voice encoding is narrower. The method for encoding the embedded voice or the voice-frequency signal comprises the following steps: dividing the signalinto a low-frequency subband and a high-frequency subband according to a frequency band occupied by mono ultra wideband voice or a voice-frequency signal; carrying out embedded encoding for a low-frequency subband signal of the mono ultra wideband voice or the voice-frequency signal in a wideband embedded encoding layer; and carrying out the embedded encoding to a high-frequency subband single ofthe mono ultra wideband voice or the voice-frequency signal in a preset high-frequency signal encoding layer. The method and the device for encoding and decoding the embedded voice or the voice-frequency signal can be applied in the fields of audio/video frequency conferences, picturephone conferences, network communication, mobile communication, network congestion control, 3-G mobile communication and 4-G mobile communication.

Method and device for encoding and decoding embedded voice or voice-frequency signal

The embodiment of the invention discloses a stereo encoding and decoding method, a coder-decoder and an encoding and decoding system, which belong to the technical field of multimedia and can encode and decode an embedded stereo signal. The stereo encoding method comprises the following steps: judging the sampling rate of a stereo signal and selecting a corresponding encoding mode; calculating the average value and the difference value to a left channel and a right channel of the stereo signal to respectively obtain a median signal and a sideband signal of the stereo signal; and respectively encoding the median signal and the sideband signal to form a code steam with an embedded structure. Relevant to the encoding process, the stereo decoding method comprises the following steps: decoding the code stream with the embedded structure by selecting different code rate layers, respectively calculating a median signal and a sideband signal, and obtaining the stereo signal by the synthesis of the median signal and the sideband signal. The embodiment can process a wideband stereo signal sampled by 16 kHz and an ultra wideband stereo signal sampled by 32 kHz by building a plurality of code rate layers.

Stereo encoding and decoding method, a coder-decoder and encoding and decoding system

The invention discloses a vector quantization method of an immittance spectrum frequency (ISF) parameter and a vector quantization device of the ISF. The invention also closes a vector quantization coding end method of the ISF parameter, a vector quantization decoding end method of the ISF parameter, a vector quantization device of the ISF parameter, a vector quantization coding end device of the ISF parameter and a vector quantization decoding end device of the ISF parameter. The methods or devices utilize prediction coefficients of unequal coefficient interframe predictor in each dimension to compute the prediction vector of the ISF parameter. Applying the invention can equalize the quantization performances when losing the frame or not in the process of bandwidth voice coding and decoding, improving the quality of voice synthesis.

Rui Li

Papers

Embedded type coding, decoding method, encoder, decoder as well as system

Frame erase concealing method and system for embedded type speech encoding

Method and device for encoding and decoding embedded voice or voice-frequency signal

Stereo encoding and decoding method, a coder-decoder and encoding and decoding system

Method and device for vector quantifying of guide resistance spectrum frequency parameter