17 results about "Comfort noise" patented technology

The invention relates to a video conference echo suppression method based on a low-delay adaptive learning model. The method comprises the following steps: acquiring acoustic scene noise features, and matching a lightweight LSTM neural network model by using the acoustic scene noise features; the method comprises the following steps: collecting real-time sound signals of a video conference, preprocessing and extracting multi-modal features of the real-time sound signals; performing adaptive filtering by using an NLMS algorithm to estimate an echo path between a near-end microphone signal and a far-end reference signal of the real-time sound signal, performing convolution on the echo path and the far-end reference signal to generate an echo estimation signal, and subtracting the echo estimation signal from the near-end microphone signal to obtain a preliminary residual signal; learning a gain by using the lightweight LSTM neural network model, and further suppressing the residual signal by using the gain to obtain a time domain enhanced signal; comfortable noise is introduced, and incremental learning is adaptively triggered. And efficient linear and nonlinear echo cancellation is supported.

Content aware audio processing includes receiving, by a digital signal processor, a frame of audio data. In response to detecting that the frame of audio data is a silent frame, the digital signal processor selects a light graph from a plurality of graphs including the light graph and a full graph. Comfort noise is generated that corresponds to the silent frame. The comfort noise frame is processed through the light graph in place of the silent frame. The light graph is dedicated for processing comfort noise frames.

A method for generation of comfort noise for at least two audio channels. The method comprises determining a spatial coherence between audio signals on the respective audio channels, wherein at least one spatial coherence value per frame and frequency band is determined to form a vector of spatial coherence values. A vector of predicted spatial coherence values is formed by a weighted combination of a first coherence prediction and a second coherence prediction that are combined using a weight factor α. The method comprises signaling information about the weight factor α to the receiving node, for enabling the generation of the comfort noise for the at least two audio channels at the receiving node.

The invention relates to an intelligent audio optimization method, and the method comprises the steps: inputting a voice signal and a network state parameter into a deep learning model for conjoint analysis, and generating a corresponding environment evaluation result; dynamically generating a voice activity detection threshold, and detecting the voice signal by using the voice activity detection threshold to determine whether the user is in a voice state; and if the user is not in the voice state, calling network state information to execute discontinuous transmission processing, and if the user is in the voice state and a voice gap exists in the voice signal, executing comfortable noise supplement processing, and outputting a target communication audio stream. Discontinuous transmission processing reduces bandwidth occupancy and energy consumption. The comfortable noise supplementary processing ensures the natural continuity and immersion of the communication process by inserting simulated background sound from a preset noise library or personalized configuration of a user into a voice gap. The stable voice communication quality is kept in a changeable environment, and the equipment power consumption is reduced.

A method and device are implemented in a multi-channel sound decoder for injecting multi-channel comfort noise in a decoded multi-channel sound signal. Background noise in a decoded mono down-mixed signal is estimated, and comfort noise for each of a plurality of channels of the decoded multi-channel sound signal is calculated in response to the estimated background noise. The calculated comfort noise is injected in the respective channels of the decoded multi-channel sound signal.

A method for generating a comfort noise (CN) parameter is provided. The method includes receiving an audio input; detecting, with a Voice Activity Detector (VAD), a current inactive segment in the audio input; as a result of detecting, with the VAD, the current inactive segment in the audio input, calculating a CN parameter CNused; and providing the CN parameter CNused to a decoder. The CN parameter CNused is calculated based at least in part on the current inactive segment and a previous inactive segment.

Transmitting node and receiving node for audio coding and methods therein. The nodes being operable to encode / decode speech and to apply a discontinuous transmission (DTX) scheme comprising transmission / reception of Silence Insertion Descriptor (SID) frames during speech inactivity. The method in the transmitting node comprising determining, from amongst a number N of hangover frames, a set Y of frames being representative of background noise, and further transmitting the N hangover frames, comprising at least said set Y of frames, to the receiving node. The method further comprises transmitting a first SID frame to the receiving node in association with the transmission of the N hangover frames, where the SID frame comprises information indicating the determined set Y of hangover frames to the receiving node. The method enables the receiving node to generate comfort noise based on the hangover frames most adequate for the purpose.

A method for generating a comfort noise (CN) parameter is provided. The method includes receiving an audio input; detecting, with a Voice Activity Detector (VAD), a current inactive segment in the audio input; as a result of detecting, with the VAD, the current inactive segment in the audio input, calculating a CN parameter CNused; and providing the CN parameter CNused to a decoder. The CN parameter CNused is calculated based at least in part on the current inactive segment and a previous inactive segment.

A method for generation of comfort noise for at least two audio channels. The method comprises determining a spatial coherence between audio signals on the respective audio channels, wherein at least one spatial coherence value per frame and frequency band is determined to form a vector of spatial coherence values. A vector of predicted spatial coherence values is formed by a weighted combination of a first coherence prediction and a second coherence prediction that are combined using a weight factor α. The method comprises signaling information about the weight factor α to the receiving node, for enabling the generation of the comfort noise for the at least two audio channels at the receiving node.

A method for generating a comfort noise (CN) parameter for a multichannel audio signal is provided. The method includes detecting an inactive segment in the multichannel audio signal and calculating a weighted average of the CN parameter for a first silence descriptor, SID, frame of the inactive segment and providing the weighted average of CN parameter to a decoder.

The present application relates to the field of audio and live broadcast technology, and provides a method, apparatus, system, device and medium for estimating comfort noise. The present application improves the transmission bandwidth utilization rate without losing the voice continuity of the receiving end. It includes: the receiving end receives the current voice frame signal of the transmitting end and obtains its first power spectrum, if there is a first part in the first power spectrum that does not reach the amplitude threshold, the current amplitude of the first part in the second power spectrum is determined according to the historical or preset amplitude of the first part in the second power spectrum, if there is a second part in the first power spectrum that reaches the amplitude threshold, the current amplitude of the second part in the second power spectrum is determined according to the smaller amplitude and the lifting coefficient, the smaller amplitude being the smaller of the amplitude of the second part in the first power spectrum and the historical amplitude of the second part in the second power spectrum; the current comfort noise signal is obtained according to the second power spectrum determined by the current amplitude, and the comfort noise signal is filled into the silent frame output when a silent frame is detected.

Enabling generation of comfort noise in an encoder using an estimated coherence parameter in a network using a discontinuous transmission, DTX, includes receiving time domain audio input comprising audio input signals; and processing the input signals on a frame-by-frame basis by: encoding active content of each input signal at a first bit rate until an inactive period is detected in the input signals; switching the encoding from the active encoding to inactive encoding to encode background noise at a second bit rate during the inactive period; estimating coherence parameters during the inactive period based on a low-pass filtering or averaging of cross-spectra including reinitializing a low pass filter state of the cross-spectra based on a coherence parameter from a previous inactive period; encoding the coherence parameters estimated; and initiating transmitting of the encoded active content, background noise, and coherence parameters towards a decoder.

Transmitting node and receiving node for audio coding and methods therein. The nodes being operable to encode / decode speech and to apply a discontinuous transmission (DTX) scheme comprising transmission / reception of Silence Insertion Descriptor (SID) frames during speech inactivity. The method in the transmitting node comprising determining, from amongst a number N of hangover frames, a set Y of frames being representative of background noise, and further transmitting the N hangover frames, comprising at least said set Y of frames, to the receiving node. The method further comprises transmitting a first SID frame to the receiving node in association with the transmission of the N hangover frames, where the SID frame comprises information indicating the determined set Y of hangover frames to the receiving node. The method enables the receiving node to generate comfort noise based on the hangover frames most adequate for the purpose.

A method for generation of comfort noise for at least two audio channels. The method comprises determining a spatial coherence between audio signals on the respective audio channels, wherein at least one spatial coherence value per frame and frequency band is determined to form a vector of spatial coherence values. A vector of predicted spatial coherence values is formed by a weighted combination of a first coherence prediction and a second coherence prediction that are combined using a weight factor α. The method comprises signaling information about the weight factor α to the receiving node, for enabling the generation of the comfort noise for the at least two audio channels at the receiving node.

The present invention provides a method and system for eliminating noise in the channel switching of an analog telephone. By constructing this method and system in the analog telephone system, the state of platform playback (third-party playback) for the local telephone is identified, and the local default audio (such as comfort noise audio, etc.) is inserted during the gap of platform playback, so as to achieve that the local channel (audio source focus) of the analog telephone does not switch, and avoid the abnormal current noise during the channel switching process.

A decoder for generating comfort noise is provided. The decoder is configured to provide a first set of background noise parameters N1 for at least one audio signal in a first spatial audio coding mode and a second set of background noise parameters N2 for the at least one audio signal in a second spatial audio coding mode. The first spatial audio coding mode is used for active segments; the second spatial audio coding mode is used for inactive segments. The decoder is further configured to adapt the first set of background noise parameters N1 to the second spatial audio coding mode, thereby providing a first set of adapted background noise parameters N̂1. The decoder is further configured to generate comfort noise parameters by combining N̂1 and N2 over a transition period, and to generate comfort noise based on the comfort noise parameters.

A method and a transmitting node for supporting generation of comfort noise for at least two audio channels at a receiving node. The method is performed by a transmitting node. The method comprises determining spectral characteristics of audio signals on at least two input audio channels and determining a spatial coherence between the audio signals. The spatial coherence is associated with perceptual importance measures. A compressed representation of the spatial coherence is determined per frequency band by weighting the spatial coherence within each frequency band according to the perceptual importance measures. Information about the spectral characteristics and the compressed representation of the spatial coherence per frequency band is signaled to the receiving node for enabling the generation of the comfort noise at the receiving node.