Patent application number | Description | Published |
20090018825 | LOW-COMPLEXITY, NON-INTRUSIVE SPEECH QUALITY ASSESSMENT - A non-intrusive signal quality assessment apparatus includes a feature vector calculator that determines parameters representing frames of a signal and extracts a collection of per-frame feature vectors (φ;(n)) representing structural information of the signal from the parameters. A frame selector preferably selects only frames (Ω\with a feature vector (φ;(n)) lying within a predetermined multi-dimensional window (⊖). Means determine a global feature set (ψ) over the collection of feature vectors (φ;(n)) from statistical moments of selected feature vector components ((1̂,01, . . . O11). A quality predictor predicts a signal quality measure (Qj from the global feature set (ψ)). | 01-15-2009 |
20090043567 | VARIABLE FRAME OFFSET CODING - The present invention relates to an improvement in frame based codecs and in particular to a en encoding/decoding method, an coder/decoder (codec) and a radio communication device. The signal provided at the output of the improved frame based codec comprises frames of regular duration though the start of a frame is time offset in relation to the end of the preceding frame. The time offset varies from frame to frame. The output signal from the improved codec has no fixed framing grid. Time offsets may be positive, in which case two successive frames are separated with a gap in which substitution signals are inserted, or negative in which case two successive frames are overlapping. As substitution signals an extrapolation of the signal in a preceding frame, an interpolation of signals from a preceding frame and a following frame or a directly coded signal may be used. Negative offset makes it possible to capture transients in the signal to be encoded. The present invention relates to an improvement in frame based codecs and in particular to a en encoding/decoding method, an coder/decoder (codec) and a radio communication device. The signal provided at the output of the improved frame based codec comprises frames of regular duration though the start of a frame is time offset in relation to the end of the preceding frame. The time offset varies from frame to frame. The output signal from the improved codec has no fixed framing grid. Time offsets may be positive, in which case two successive frames are separated with a gap in which substitution signals are inserted, or negative in which case two successive frames are overlapping. As substitution signals an extrapolation of the signal in a preceding frame, an interpolation of signals from a preceding frame and a following frame or a directly coded signal may be used. Negative offset makes it possible to capture transients in the signal to be encoded. | 02-12-2009 |
20100063801 | Postfilter For Layered Codecs - A scalable decoder device ( | 03-11-2010 |
20100063805 | NON-CAUSAL POSTFILTER - A decoder arrangement comprising a receiver input for parameters of frame-based coded signals and a decoder arranged to provide frames of decoded audio signals based on the parameters. The receiver input and/or the decoder is arranged to establish a time difference between the occasion when parameters of a first frame is available at the receiver input and the occasion when a decoded audio signal of the first frame is available at an output of the decoder, which time difference corresponds to at least one frame. A postfilter is connected to the output of the decoder and to the receiver input. The postfilter is arranged to provide a filtering of the frames of decoded audio signals into an output signal in response to parameters of a respective subsequent frame. | 03-11-2010 |
20100088092 | Method and Arrangement for Controlling Smoothing of Stationary Background Noise - In a method of smoothing stationary background noise in a telecommunication speech session, initially receiving and decoding S | 04-08-2010 |
20100114567 | Method And Arrangement For Smoothing Of Stationary Background Noise - In a method of smoothing background noise in a telecommunication speech session; receiving and decoding S | 05-06-2010 |
20100324918 | Continued Telecommunication with Weak Links - According to the invention a receiving end terminal (RET) enters a delay mode based on the detecting of the quality of the link being lower than a threshold. In this delay mode, the receiving end terminal provides a reception delay indicator (RDI) for a sending end terminal (SET). The sending end terminal (SET) receives the reception delay indicator (RDI) and provides an end of speech indicator (ESI) for the receiving end terminal (RET) at an end of a speech coding interval (SC). The receiving end terminal (RET) uses the reception delay indicator (RDI) and end of speech indicator (ESI) to define a first time interval (AL | 12-23-2010 |
20110153336 | MULTI-MODE SCHEME FOR IMPROVED CODING OF AUDIO - The present invention relates to an improved scheme for coding of audio. In particular, the present invention relates to an encoder device and a method for coding an input signal in an encoder system. The method comprises applying a first mode to the input signal to form a first output and applying a second mode to the input signal to form a second output. A first processed output is then formed from at least a part of the first output, and a second processed output is formed from at least a part of the second output. Forming a second processed output comprises estimating a part of the input signal from at least a part of the second output. Then, an optimum mode is determined based on the firstprocessedoutput and the secondprocessedoutput, and the output according to the optimum mode is selected. | 06-23-2011 |
20120035918 | METHOD AND ARRANGEMENT FOR PROVIDING A BACKWARDS COMPATIBLE PAYLOAD FORMAT - In a method of providing a backward and forward compatible speech codec payload format, the following steps are included: providing S | 02-09-2012 |
20120106451 | Method and Arrangement for Session Negotiation - In a method of improved session negotiation between first and second clients in a cellular telecommunication system, the two clients negotiating S | 05-03-2012 |
20120140650 | BANDWIDTH EFFICIENCY IN A WIRELESS COMMUNICATIONS NETWORK - A method of processing a signal for transmission, the method comprising: determining a quality of a first portion of the signal; and if the quality satisfies a threshold criterion then aggregating a representation of the first portion of the signal with a representation of a subsequent portion of the signal. | 06-07-2012 |
20120230515 | BANDWIDTH EXTENSION OF A LOW BAND AUDIO SIGNAL - Estimation of a high band extension of a low band audio signal includes the following steps: extracting (S | 09-13-2012 |
20120239388 | EXCITATION SIGNAL BANDWIDTH EXTENSION - An apparatus for generating a high band extension of a low band excitation signal (e | 09-20-2012 |
20120323568 | Source Code Adaption Based on Communication Link Quality and Source Coding Delay - Method and arrangement in a network node for adapting a property of source coding to the quality of a communication link in packet switched conversational services in a communication system. The method comprises obtaining ( | 12-20-2012 |
20130066641 | Encoder Adaption in Teleconferencing System - The invention relates to a method and an arrangement for encoding of signals in teleconferencing. The method involves receiving ( | 03-14-2013 |
20130096913 | METHOD AND APPARATUS FOR ADAPTIVE MULTI RATE CODEC - There is provided an apparatus and method for encoding a speech signal. The encoding comprises: receiving a plurality of current samples of the speech signals; extrapolating a plurality of look-ahead samples from the current samples; and performing linear prediction analysis using the current samples and the extrapolated look-ahead samples. | 04-18-2013 |
20130110506 | Audio Encoder and Decoder and Methods for Encoding and Decoding an Audio Signal | 05-02-2013 |