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7577566 |
Method for encoding sound source of probabilistic code book
A stochastic codebook associates a pulse position of a predetermined channel with a pulse position of another channel, searches for a pulse position by means of a predetermined algorithm, and...
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7472057 |
Detector for use in voice communications systems
One or more methods and systems of detecting or identifying one or more types of algorithms used in the encoding of a voice or speech waveform is presented. The system and method may be used as a...
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7471776 |
System and method for communication with an interactive voice response system
Described is a system and method for communicating using a telecommunications device which includes an automatic speech recognition (ASR) system. The ASR system which is capable of recognizing at...
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7451078 |
Methods and apparatus for identifying media objects
A method, apparatus and computer memory are provided for generating an audio fingerprint of an audio recording. A memory stores stable frequency family data corresponding to a plurality of stable...
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7391813 |
Digital wireless communications device
A digital wireless communications device enabling call distance to be increased while avoiding mute processing as far as possible, even if code error occurs in an ADPCM code. The digital wireless...
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7343282 |
Method for transcoding audio signals, transcoder, network element, wireless communications network and communications system
The invention relates to a method for transcoding audio signals in a communications system. In order to improve the inter-operability between units ( 2,40 ) capable of handling wideband audio...
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7336713 |
Method and apparatus for encoding and decoding data
A DPCM operation which can reduce the size of differential data and a method and an apparatus for encoding data using the DPCM operation are provided. A method for generating differential data...
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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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7298783 |
Method of compressing sounds in mobile terminals
A method of compressing sounds in mobile terminals according to the present invention transforms pulse code modulations (PCM) codes, which are source data of bell sounds using recorded sounds or...
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7289461 |
Communications using wideband terminals
A call setup procedure is presented to permit vocoder bypass, which will allow the transmission of wideband speech packets between wideband terminals over narrowband transmission constraints. In...
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7269551 |
Apparatus including an error detector and a limiter for decoding an adaptive differential pulse code modulation receiving signal
An apparatus for decoding encoded voice data comprises a demodulator ( 101 ) which demodulates the encoded voice data (RF) and provides a demodulated encoded voice data (APO, RD), an adaptive...
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7260520 |
Enhancing source coding systems by adaptive transposition
The present invention relates to a new method for enhancement of source coding systems using high-frequency reconstruction. The invention teaches that tonal signals can be classified as either...
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7240000 |
Control of speech code in mobile communications system
There is disclosed a method of controlling a speech code of speech communications between mobile terminals via an IP network, between mobile switching centers which are interconnected through the...
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7206739 |
Excitation codebook search method in a speech coding system
A method for searching an excitation (or fixed) codebook in a speech coding system. In a speech coding system including a synthesis filter for synthesizing a speech signal, a fixed codebook...
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7203637 |
Transmission of compressed information with real time requirement in a packet oriented information network
The present invention relates to packet-distributed data transmission of compressed data. According to the invention, parity bits are supplied to the compressed data. The parity bits are used in...
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7197093 |
Digital signal processing apparatus and digital signal processing method
A digital signal of which input data has been segmented as block each having a predetermined data amount and highly efficiently encoded along with an adjacent block is decoded, edited, and then...
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7155384 |
Speech coding and decoding apparatus and method with number of bits determination
An audio signal coding device, an audio signal decoding device and a method to improve audio quality. The audio signal coding device and method include a quantizer that quantizes a given signal...
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7126501 |
Floating point type digital signal reversible encoding method, decoding method, devices for them, and programs for them
Digital signal samples X in a floating-point format, each of which is composed of 1 bit of sign, 8 bits of exponent E and 23 bits of mantissa M, are converted through rounding by an integer...
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7113907 |
Circuits and methods for reducing pin count in multiple-mode integrated circuit devices
A method of controlling a terminal of an integrated circuit includes determining a frequency ratio between a frequency of a signal and a frequency of another signal received by an integrated...
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7107208 |
Dual mode radio mobile terminal in which an analog or digital mode is determined by request of a voice function
A method for operating a voice function of a dual-mode mobile communication apparatus including a speaker's voice recognition function and a voice output function of stored information while the...
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7096180 |
Method and apparatuses for improving quality of digitally encoded speech in the presence of interference
Methods and apparatuses for encoding speech signals in the presence of interference that accurately establishes a speech signal value subsequent to lost transmission packets. For one embodiment of...
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7076260 |
Unbalanced coding for cordless telephony
In a digital cordless telephone system, a different speech coding scheme is used in the audio path from the base unit to its remote handset than that which is used in the audio path in the opposite...
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7057539 |
Systems and methods for clock mode determination utilizing explicit formulae and lookup tables
A system for determining a data converter operating mode includes measurement circuitry operable to measure a master clock frequency of a master clock signal and measure a frequency ratio between a...
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6917913 |
Digital filter for sub-band synthesis
In a MPEG audio decoding process, an IDCT (Inverse Discrete Cosine Transform) process that generates time domain samples from frequency domain samples using a very limited number of prestored...
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6917654 |
Increased digital bandwidth carried on an analog signal cycle using a data structure
A communication system is disclosed that encodes multiple bits of digital data on a single analog signal cycle. The communication system includes a digital data encoding system that receives the...
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6904403 |
Audio transmitting apparatus and audio receiving apparatus
In transmission of digital audio data usingIEEE1394, for example, when the audio data is changed from linear PCM to nonlinear PCM, identifier adding means of the transmitting apparatus inserts a...
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6856954 |
Flexible variable rate vocoder for wireless communication systems
A flexible variable rate vocoder and related method of operation. The vocoder selects a target average data rate responsive to at least one network parameter and at least one external parameter.
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6850883 |
Decoding method, speech coding processing unit and a network element
This invention is related to tandem free operation (TFO) in mobile cellular systems. The present invention implements a tandem free operation by using a special feedback loop which makes the...
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6785557 |
Method of transmitting data, in particular GSM data
The data stream between the transcoders (TCE 1 , TCE 2 ) of a mobile wireless system is subdivided into a first data stream with samples for transmission and a second data stream with signal...
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6768978 |
Speech coding/decoding method and apparatus
An input speech signal to an input terminal is supplied to a speech synthesizer section through a speech analyzer section and frequency parameter quantizer section to form a synthesis filter, and...
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6766289 |
Fast code-vector searching
Methods and apparatus for quickly selecting an optimal excitation waveform from a codebook are presented herein. In encoding schemes that use forward and backward pitch enhancement, storage and...
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6721711 |
Audio waveform reproduction apparatus
The present invention relates to an audio waveform reproduction apparatus for reproducing a recorded audio waveform at a reproduction tempo that can be specified as desired, and its object is to...
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6714907 |
Codebook structure and search for speech coding
A speech compression system with a special fixed codebook structure and a new search routine is proposed for speech coding. The system is capable of encoding a speech signal into a bitstream for...
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6625574 |
Method and apparatus for sub-band coding and decoding
An input digital audio signal is divided into sub-band signals in respective sub-bands. Scale factors of the respective sub-bands are determined on the basis of the sub-band signals for every...
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6556966 |
Codebook structure for changeable pulse multimode speech coding
A speech compression system with a special fixed codebook structure and a new search routine is proposed for speech coding. The system is capable of encoding a speech signal into a bitstream for...
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6556844 |
Process for transmitting data, in particular GSM data
A data stream between transcoders of a mobile wireless system is subdivided into a first data stream with samples for transmission and a second data stream with signal parameters for reconstruction...
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6553061 |
Method and apparatus for detecting a waveform
A device for detecting a predetermined waveform in a received signal and synchronizing the detected waveform to the predetermined waveform is disclosed. The device includes a memory element for...
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6490704 |
Method for correcting synchronization error and radio system
The invention relates to a digital radio system and to a method for correcting a synchronization error in a digital radio system comprising at least one base station ( 100 ) communicating with...
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6456966 |
Apparatus and method for decoding audio signal coding in a DSR system having memory
A deciding apparatus and method for deciding an audio signal coding system. A digital signal processor receives a coded audio signal, selects a specific coding system for the coded audio signal...
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6453286 |
Computer system for processing image and sound data using ADPCM stereo coding
A computer system having a PSG, a volume control circuit, a sound data output unit containing two channels of an ADPCM decoder each using a 32 kHz sampling frequency, a 32 bits CPU, an output...
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6434139 |
Method for optimizing mobile wireless communications routed across plural interconnected networks
A telecommunication system routs real-time information traffic from an originating digital radio unit served by an originating network to a terminating unit served by a terminating network via an...
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6311161 |
System and method for merging multiple audio streams
A device and method are provided for merging one or more secondary audio channels, received from either a streaming application or from memory, with a primary stream of audio data output from a...
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6289306 |
Data processing of a bitstream signal
A data processing apparatus includes an input terminal for receiving an audio signal, a 1-bit A/D converter for A/D converting the audio signal so as to obtain a bitstream signal, and a prediction...
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6256353 |
Method and apparatus for generating a probing signal for a system having non-linear network and codec distortion
The present invention provides a method of generating a signal that may be used to determine the characteristic response of a communication channel that utilizes the public Digital Telephone...
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6230136 |
Voice control system and navigation system using same
To decode voice data coded in a coding system on a specific standard (for example, ADPCM or a different standard), the voice data is previously sorted by a data sorter 102 and is stored in a second...
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6188884 |
Telephony device comprising a digital processing element for speech signals and method implemented in such a device
A telephony device includes a base station and a wireless handset. The base station has a responder with a memory. A processor of base station processes digital speech signals having a first code...
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6173254 |
Recorded message playback system for a variable bit rate system
A greeting message is recorded and stored at a first rate for use in a system. The system includes a command indicating the desired rate to be used in coding on the system. The greeting message is...
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6138090 |
Encoded-sound-code decoding methods and sound-data coding/decoding systems
A encoded-sound-code decoding method comprises a first step of performing a decoding process on a predetermined number of sample codes starting from a sound-reproduction start position at some...
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6134242 |
Method of reverting to tandem operation between transcoders of a communication system
To facilitate the reversion of a communication to tandem operation (200), a first transcoder (20), having previously changed back to tandem operation (206), inverts bits (208) of a double-encoded...
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6122607 |
Method and arrangement for reconstruction of a received speech signal
The present invention relates to a method and an arrangement for reconstruction of a received speech signal (r), which has been transmitted over a radio channel that has been subjected to...
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