Patent application number | Description | Published |
20080312914 | SYSTEMS, METHODS, AND APPARATUS FOR SIGNAL ENCODING USING PITCH-REGULARIZING AND NON-PITCH-REGULARIZING CODING - A time shift calculated during a pitch-regularizing (PR) encoding of a frame of an audio signal is used to time-shift a segment of another frame during a non-PR encoding. | 12-18-2008 |
20090187409 | METHOD AND APPARATUS FOR ENCODING AND DECODING AUDIO SIGNALS - Techniques for efficiently encoding an input signal are described. In one design, a generalized encoder encodes the input signal (e.g., an audio signal) based on at least one detector and multiple encoders. The at least one detector may include a signal activity detector, a noise-like signal detector, a sparseness detector, some other detector, or a combination thereof. The multiple encoders may include a silence encoder, a noise-like signal encoder, a time-domain encoder, a transform-domain encoder, some other encoder, or a combination thereof. The characteristics of the input signal may be determined based on the at least one detector. An encoder may be selected from among the multiple encoders based on the characteristics of the input signal. The input signal may be encoded based on the selected encoder. The input signal may include a sequence of frames, and detection and encoding may be performed for each frame. | 07-23-2009 |
20110294501 | CODEC DEPLOYMENT USING IN-BAND SIGNALS - After a call is established between two stations using a codec that has been negotiated during call setup, in-band signaling may be used between the two stations to change the codec that is to be used. The in-band signals are indicative that the station that is transmitting the in-band signals can operate with a second codec and are used to probe whether the receiving station can also operate with that second codec. If the receiving station detects and reacts to the in-band signals, then both stations change to communicate with the second codec. The second codec has compatible packet sizes of the deployed (originally negotiated) codec without any need of infrastructure upgrade and/or quality compromise to legacy phone users (i.e., stations that cannot operate with the second codec). | 12-01-2011 |
20120029923 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR CODING OF HARMONIC SIGNALS - A scheme for coding a set of transform coefficients that represent an audio-frequency range of a signal uses a harmonic model to parameterize a relationship between the locations of regions of significant energy in the frequency domain. | 02-02-2012 |
20120029924 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR MULTI-STAGE SHAPE VECTOR QUANTIZATION - A multistage shape vector quantizer architecture uses information from a selected first-stage codebook vector to generate a rotation matrix. The rotation matrix is used to rotate the direction of the input vector to support shape quantization of the first-stage quantization error. | 02-02-2012 |
20120029925 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR DYNAMIC BIT ALLOCATION - A dynamic bit allocation operation determines a bit allocation for each of a plurality of vectors, based on a corresponding plurality of gain factors, and compares each allocation to a threshold value that is based on a dimensionality of the vector. | 02-02-2012 |
20120029926 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR DEPENDENT-MODE CODING OF AUDIO SIGNALS - A scheme for coding a set of transform coefficients that represent an audio-frequency range of a signal uses information from a reference frame that describes a previous frame of the signal to determine frequency-domain locations of regions of significant energy in a target frame of the signal. | 02-02-2012 |
20120046955 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR NOISE INJECTION - A scheme for injecting noise at uncoded elements of a spectrum is controlled according to a measure of a distribution of energy of the original spectrum among the locations of the uncoded elements. | 02-23-2012 |
20120296641 | SYSTEMS, METHODS, AND APPARATUS FOR WIDEBAND ENCODING AND DECODING OF INACTIVE FRAMES - Speech encoders and methods of speech encoding are disclosed that encode inactive frames at different rates. Apparatus and methods for processing an encoded speech signal are disclosed that calculate a decoded frame based on a description of a spectral envelope over a first frequency band and the description of a spectral envelope over a second frequency band, in which the description for the first frequency band is based on information from a corresponding encoded frame and the description for the second frequency band is based on information from at least one preceding encoded frame. Calculation of the decoded frame may also be based on a description of temporal information for the second frequency band that is based on information from at least one preceding encoded frame. | 11-22-2012 |
20120303362 | NOISE-ROBUST SPEECH CODING MODE CLASSIFICATION - A method of noise-robust speech classification is disclosed. Classification parameters are input to a speech classifier from external components. Internal classification parameters are generated in the speech classifier from at least one of the input parameters. A Normalized Auto-correlation Coefficient Function threshold is set. A parameter analyzer is selected according to a signal environment. A speech mode classification is determined based on a noise estimate of multiple frames of input speech. | 11-29-2012 |
20130179159 | SYSTEMS AND METHODS FOR DETECTING OVERFLOW - A method for detecting overflow on an electronic device is described. The method includes determining a linear predictive coding synthesis filter gain. The method further includes determining whether overflow is detected based on the linear predictive coding synthesis filter gain and a fixed codebook gain. The method further includes determining a scaling factor if overflow is detected. | 07-11-2013 |
20130185062 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR CRITICALITY THRESHOLD CONTROL - Systems, methods, and apparatus as disclosed herein may be implemented to adjust criticality thresholds for speech frames, based on channel conditions. Such a threshold may be used to control retransmission frequency in response to changes in channel state. | 07-18-2013 |
20130185084 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR BIT ALLOCATION FOR REDUNDANT TRANSMISSION - Compressibility-based reallocation of initial bit allocations for frames of an audio signal is described. Applications to redundancy-based retransmission of critical frames (e.g., for fixed-bit-rate modes of speech codec operation) are also described. | 07-18-2013 |
20130191121 | DEVICES FOR REDUNDANT FRAME CODING AND DECODING - A method for redundant frame coding by an electronic device is described. The method includes determining an adaptive codebook energy and a fixed codebook energy based on a frame. The method also includes coding a redundant version of the frame based on the adaptive codebook energy and the fixed codebook energy. The method further includes sending a subsequent frame. | 07-25-2013 |
20140214413 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR ADAPTIVE FORMANT SHARPENING IN LINEAR PREDICTION CODING - A method of processing an audio signal includes determining an average signal-to-noise ratio for the audio signal over time. The method includes, based on the determined average signal-to-noise ratio, a formant-sharpening factor is determined. The method also includes applying a filter that is based on the determined formant-sharpening factor to a codebook vector that is based on information from the audio signal. | 07-31-2014 |
20140236583 | SYSTEMS AND METHODS FOR DETERMINING AN INTERPOLATION FACTOR SET - A method for determining an interpolation factor set by an electronic device is described. The method includes determining a value based on a current frame property and a previous frame property. The method also includes determining whether the value is outside of a range. The method further includes determining an interpolation factor set based on the value and a prediction mode indicator if the value is outside of the range. The method additionally includes synthesizing a speech signal. | 08-21-2014 |
20140236584 | SYSTEMS AND METHODS FOR QUANTIZING AND DEQUANTIZING PHASE INFORMATION - A method for quantizing phase information on an electronic device is described. The method includes obtaining a speech signal. The method also includes determining a prototype pitch period signal based on the speech signal and transforming the prototype pitch period signal into a first frequency-domain signal. The method additionally includes mapping the first frequency-domain signal into a plurality of subbands. The method also includes determining a global alignment based on the first frequency-domain signal and quantizing the global alignment utilizing scalar quantization to obtain a quantized global alignment. The method additionally includes determining a plurality of band alignments corresponding to the plurality of subbands. The method also includes quantizing the plurality of band alignments utilizing vector quantization to obtain a quantized plurality of band alignments. The method further includes transmitting the quantized global alignment and the quantized plurality of band alignments. | 08-21-2014 |
20140236585 | SYSTEMS AND METHODS FOR DETERMINING PITCH PULSE PERIOD SIGNAL BOUNDARIES - A method for determining pitch pulse period signal boundaries by an electronic device is described. The method includes obtaining a signal. The method also includes determining a first averaged curve based on the signal. The method further includes determining at least one first averaged curve peak position based on the first averaged curve and a threshold. The method additionally includes determining pitch pulse period signal boundaries based on the at least one first averaged curve peak position. The method also includes synthesizing a speech signal. | 08-21-2014 |
20140236587 | SYSTEMS AND METHODS FOR CONTROLLING AN AVERAGE ENCODING RATE - A method for controlling an average encoding rate by an electronic device is described. The method includes obtaining a speech signal. The method also includes determining a first average rate. The method further includes determining a first threshold based on the first average rate. The method additionally includes controlling the average encoding rate by determining at least one other threshold based on the first threshold. The method also includes sending an encoded speech signal. | 08-21-2014 |
20140236588 | SYSTEMS AND METHODS FOR MITIGATING POTENTIAL FRAME INSTABILITY - A method for mitigating potential frame instability by an electronic device is described. The method includes obtaining a frame subsequent in time to an erased frame. The method also includes determining whether the frame is potentially unstable. The method further includes applying a substitute weighting value to generate a stable frame parameter if the frame is potentially unstable. | 08-21-2014 |