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7620545 |
Scale factor based bit shifting in fine granularity scalability audio coding
One embodiment of the present invention provides a method coding audio signals in a base layer and an enhancement layer comprising the steps of quantizing the audio signals in spectral lines into...
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7620543 |
Method, medium, and apparatus for converting audio data
A method, medium, and apparatus for converting compressed audio data, including decoding compressed audio input data, in accordance with a corresponding compression format, coding a result of the...
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7613609 |
Apparatus and method for encoding a multi-channel signal and a program pertaining thereto
To encode multi-channel digital data by adjusting the number of bits allocated to each channel to perform entropy coding of the multi-channel data, there is provided a multi-channel encoder...
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7613606 |
Speech codecs
A method of encoding a frame in a communication network using multiple codec modes, wherein the frame encoded by each codec mode is represented by multiple parameters. The method includes at least...
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7613605 |
Audio signal encoding apparatus and method
An audio signal encoding apparatus includes a frame dividing unit ( 1 ), an auditory psychological arithmetic unit ( 2 ), a filter bank unit ( 3 ), a scale factor calculation unit ( 4 ) which...
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7613603 |
Audio coding device with fast algorithm for determining quantization step sizes based on psycho-acoustic model
An efficient audio coding device that quantizes and encodes digital audio signals with a reduced amount of computation. A spatial transform unit subjects samples of a given audio signal to a...
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7606711 |
Audio signal processing device, signal recovering device, audio signal processing method and signal recovering method
The pitch extracting part generates a pitch waveform signal in a manner making the time interval of the pitch of the input audio sound data to be the same. After the number of samples in each...
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7606705 |
Speech data receiver with detection of channel-coding rate
Disclosed is a system and method for channel decoding speech frames in a receiver capable of multiple (M) codec modes, wherein channel encoded speech frames include an inband bit portion and a...
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7599835 |
Digital signal encoding method, decoding method, encoding device, decoding device, digital signal encoding program, and decoding program
A down sampler 13 down samples a digital signal in the sampling frequency thereof from 96 kHz to 48 kHz on a frame-by-frame basis. The converted signal is compression encoded and output as a main...
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7590543 |
Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks
The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels...
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7577570 |
Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks
The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels...
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7565289 |
Echo avoidance in audio time stretching
A transient echo can be avoided during time stretching of a digital audio signal by detecting a transient in a frame of a digital audio signal, identifying another occurrence of the transient in a...
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7543212 |
Low-density parity-check (LDPC) encoder
The encoder chip of the present invention uses LDPC codes to encode input message data at a transmitting end, thereby generating a series of codewords. The encoder chip implements two low-density...
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7498959 |
Apparatus and method of wideband decoding to synthesize a decoded excitation signal with a generated high frequency band signal
Encoding and/or decoding a wideband signal produces high frequency band spectra from low frequency band spectral information. Linear prediction filter coefficients are determined for the entire...
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7496517 |
Method and device for generating a scalable data stream and method and device for decoding a scalable data stream with provision for a bit saving bank function
In a method for generating a scalable data stream from one or several blocks of output data of a first encoder and from one or several blocks of output data of a second encoder a determining data...
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7469209 |
Method and apparatus for frame classification and rate determination in voice transcoders for telecommunications
A method and apparatus for frame classification and rate determination in voice transcoders. The apparatus includes a classifier input parameter preparation module that unpacks the bitstream from...
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7451080 |
Controlling apparatus and method for bit rate
An apparatus and a method for controlling a bit rate are provided. The apparatus and method includes a buffer for storing information as to a bit rate of a frame immediately preceding a frame to be...
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7437299 |
Coding of stereo signals
A method of encoding a multichannel signal, such as a stereophonic audio signal, including at least first and second signal components includes transforming at least the first and second signal...
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7437285 |
Adaptive media encoding and decoding equipment
An encoding unit encodes data at a first rate during an initial predetermined section of uncompressed data (a), and encodes data at a second rate after the initial predetermined section (where the...
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7433817 |
Apparatus and method applying adaptive spectral whitening in a high-frequency reconstruction coding system
The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilising high frequency reconstruction (HFR). It utilises adaptive filtering to...
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7421376 |
Comparison of data signals using characteristic electronic thumbprints
A characteristic thumbprint is extracted from a data signal, the thumbprint based on statistics relating to the data signal. The data signal can be compared indirectly by matching this thumbprint...
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7409338 |
Softbit speech decoder and related method for performing speech loss concealment
A softbit speech decoder includes a speech loss concealment circuit receiving bit information, bit error probability data, and a speech information flag from an equivalent channel based on a...
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7406412 |
Reduced computational complexity of bit allocation for perceptual coding
A process that allocates bits for quantizing spectral components in a perceptual coding system is performed more efficiently by obtaining an accurate estimate of the optimal value for one or more...
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7383180 |
Constant bitrate media encoding techniques
CBR control strategies provide constant or relatively constant bitrate output with variable quality. The control strategies include various techniques and tools, which can be used in combination or...
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7373293 |
Quantization noise shaping method and apparatus
A method and apparatus for shaping quantization noise generated when compressing audio data at a low bit rate is disclosed. A predetermined quantization noise threshold allowed during quantization...
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7373282 |
Fault severity check and source identification
A fault severity check and source identification method for a frequency domain instrument accesses acquired reflection data for a transmission line under test. From the acquired data reflection...
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RE40280 |
Rate loop processor for perceptual encoder/decoder
A method and apparatus for quantizing audio signals is disclosed which advantageously produces a quantized audio signal which can be encoded within an acceptable range. Advantageously, the...
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7363231 |
Coding device, decoding device, and methods thereof
A coding device capable of improving the coding efficiency and a decoding device for decoding a code sequence generated by the coding device are provided. In the coding device, for each of the...
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7349842 |
Rate-distortion control scheme in audio encoding
An initial number of bits associated with an initial common scale factor is determined, an initial increment is computed using the initial number of bits and a target number of bits, and the...
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7343287 |
Method and apparatus for scalable encoding and method and apparatus for scalable decoding
An apparatus for scalable encoding a spectrum of a signal including audio and/or video information, with the spectrum comprising binary spectral values, includes a means for generating a first...
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7343286 |
Method and apparatus for digital signal processing
A method and an apparatus analogically output low-resolution digital signals to achieve an equal analog output result of a high-resolution digital signal under a request of signal quality. The...
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7343285 |
Method to integrate user data into uncompressed audio data
Methods for encoding user data into an audio file, and for decoding of the same, are provided. Embodiments include preparing user data for encoding into the audio file including writing user data...
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7330812 |
Method and apparatus for transmitting an audio stream having additional payload in a hidden sub-channel
Methods and apparatus are provided for communicating an audio stream. A perceptual mask is estimated for an audio stream, based on the perceptual threshold of the human auditory system. A hidden...
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7330738 |
Apparatus and method for canceling residual echo in a mobile terminal of a mobile communication system
An apparatus for canceling an echo signal in a mobile terminal of a mobile communication system. A double talk detector (DTD) receives a first signal by canceling an estimated echo signal from a...
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7328152 |
Fast bit allocation method for audio coding
A fast bit allocation algorithm for audio coding is disclosed. A virtual Huffman codebook model is referred in a trellis-based optimization approach to obtain a set of optimized scale factors, and...
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7318027 |
Conversion of synthesized spectral components for encoding and low-complexity transcoding
In an audio coding system, an encoding transmitter represents encoded spectral components as normalized floating-point numbers. The transmitter provides first and second control parameters that may...
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7318026 |
Encoding apparatus and method, decoding apparatus and method, and recording medium recording apparatus and method
An encoding method comprising the steps of forming a difference signal which is the difference between a first channel signal and a second channel signal of an input PCM signal, encoding the...
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7315817 |
Sound encoder and sound decoder
An sound encoder accepts a sound signal and then produces a plurality of codes which represent the sound signal on a frame-by-frame basis. The sound encoder determines the order in which the...
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7315814 |
Method and apparatus providing adaptive multi-rate speech coding
A wireless telecommunications system comprises a mobile station (MS) and a network. The mobile station has a multi-rate speech encoder which produces an encoded speech signal which is transmitted...
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7313520 |
Adaptive variable bit rate audio compression encoding
An adaptive variable bit rate audio encoder and method that examines audio level information and detects various information in the audio data in a psychoacoustic model to create a quantization...
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7310596 |
Method and system for embedding and extracting data from encoded voice code
When a voice encoding apparatus embeds any data in encoded voice code, the apparatus determines whether data embedding condition is satisfied using a first element code from among element codes...
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7302386 |
Focused search method of fixed codebook and apparatus thereof
There are provided a search method of a fixed codebook, and more particularly, a focused search method and apparatus thereof, for being applied to a speech codec for Voice over Internet Protocol...
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7299172 |
Systems and methods for sound compression
Embodiments of the invention achieve increased compression of audio data in comparison to prior art ADPCM compression schemes using modest processing power and resources. For one embodiment, an...
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7295973 |
Quality control quantization loop and bitrate control quantization loop for quality and rate control for digital audio
An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and...
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7277849 |
Efficiency improvements in scalable audio coding
An audio encoding method of coding audio signals into a layered data stream having a first layer and a second layer is presented. The second layer serves as an enhancement of the first layer. The...
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7275031 |
Apparatus and method for encoding an audio signal and apparatus and method for decoding an encoded audio signal
When encoding an audio signal, the audio signal is first encoded with the first encoder to obtain a first encoder output signal. This first encoder output signal is written into a bit stream. It is...
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7272566 |
Reducing scale factor transmission cost for MPEG-2 advanced audio coding (AAC) using a lattice based post processing technique
A perceptual encoder divides an audio signal into successive time blocks, each time block is divided into frequency bands, and a scale factor is assigned to each of ones of the frequency bands....
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7269564 |
Method and apparatus to indicate an encoding status for digital content
A method of determining an encoding rate for digital content. According to the method, the a sample of the content data is encoded for a predetermined period of time. The encoding rate is...
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7269554 |
Method, apparatus, and system for efficient rate control in audio encoding
According to one aspect of the invention, a method is provided in which audio samples representing an input audio signal are received. The input audio samples are transformed into a vector of...
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7263481 |
Method and apparatus for improved quality voice transcoding
A method and apparatus for a voice transcoder that converts a bitstream representing frames of data encoded according to a first voice compression standard to a bitstream representing frames of...
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