Ess Technology, Inc.

Csr Technology Inc.

Zoran Corporation

Microtune (texas), Inc.

Fortemedia, Inc.

Ping Dong

Jordan C Cookman

Tao Yu

Kuo-Yu Lin

Sriram Mudulodu

Wan-Chieh Pai

Qing-Guang Liu

Junjie Qu

An audio apparatus is provided. The audio apparatus includes at most one electroacoustic transducer; and an audio controller, coupled to the electroacoustic transducer, for actively controlling the electroacoustic transducer to function as a loudspeaker or a microphone, wherein the loudspeaker converts output electrical signals to output sounds, and the microphone converts input sounds to input electrical signals.

Audio apparatus and audio controller thereof

An adaptive known signal canceller comprising of a known signal canceller filter responsive to a known signal including a known portion of a transmitted signal, the known signal canceller filter operative to generate a filtered known signal, and a subtractor unit responsive to an input signal and operative to generate an output signal, the subtractor unit configured to subtract the filtered known signal from the input signal to generate an output signal, such that the known portion of the transmitted signal is substantially removed from the input signal. The adaptive known signal canceller further comprising of a known signal canceller update unit, responsive to a desired signal and an output signal and operative to continually adjust the coefficients of the known signal canceller filter based on the difference between the output signal and the desired signal, so that the filter coefficients substantially reflect the impulse response of a channel.

Adaptive known signal canceller

A method and apparatus for deinterleaving in a communication system is disclosed. The method and apparatus deinterleave data units using a data deinterleaver; compressed deinterleave input symbol quality information (SQI) units using a compressed deinterleaver, wherein at least one of the input SQI units deinterleaved by the compressed deinterleaver corresponds to at least one of the plurality of data units deinterleaved by the data deinterleaver; and apply the deinterleaved SQI units to the corresponding deinterleaved data units.

Method and apparatus for deinterleaving in a digital communication system

An extended deinterleaver the extended deinterleaver being responsive to at least one input signal, comprised of codewords, and operative to generate a deinterleaved output signal. The extended deinterleaver comprising a storage space organized into B number of appended storage branches, at least one appended storage branch having a storage branch and at least one element N, the received codewords being deinterleaved and buffered by the extended deinterleaver prior to being provided to the variable iteration decoder. Each appended storage branch further having a length that is extended by the length of N, N being at least one element, wherein as a codeword is provided to the variable iteration decoder, other codewords are provided to subsequent appended storage branches, and further wherein each appended storage branch, indexed by 'b', has a length of L+N, wherein Lis the length of the storage branch prior to appending N.

Extended deinterleaver for an iterative decoder

An iterative decoder circuit includes an N number of sub-decoders, N&#x2212;1 of the sub-decoders each being responsive to a baseband signal from one of M number of signal processing circuits. Each of the N&#x2212;1 number of sub-decoders includes, an inner delay responsive to a baseband signal provided by a corresponding signal processing circuit for generating an inner delayed signal, a modified decoder that receives the inner delayed signal and generates a set partition signal, some of which have less errors than previous set partition signals. An Nth inner delay is responsive to the baseband signal and provides an Nth inner delayed signal. An Nth modified decoder is responsive to the Nth inner delayed signal and to the set partition signal and provides an output signal, wherein the probability of error of the output signal is reduced by correcting errors in some of the set partition signals.

Diversity combining iterative decoder

In one embodiment of the present invention, a segmented equalizer includes a plurality of feedforward equalizer segments, each feedforward equalizer segment responsive to delayed samples of an input signal {v}, wherein n is the index of samples, and including a filter block for filtering the delayed samples by using coefficients which are updated based on a step size generated for each equalizer segment.

Segmented equalizer

In accordance with a method and apparatus of the present invention, a timing recovery device is disclosed to include a timing correction module responsive to a sampled input signal and adapted to generate a time-corrected signal and to further include a linear predictor coupled to the timing correction module for filtering the time-corrected signal to generate a whitened output signal and to further include a timing update module responsive to the whitened output signal for updating at least one parameter in the timing correction module.

Optimized timing recovery device and method using linear predictor

In one embodiment of the present invention, a dynamic multi-path detection device is disclosed to include at least one narrow-band signal metric estimator responsive to input signal. Each of the at least one estimators measures a particular characteristic of the input signal in a frequency band that is narrower than the overall signal bandwidth and is operative to generate a signal parameter estimate signal. The dynamic multi-path detection device is further disclosed to include a signal metric comparison device responsive to the signal parameter estimate signal(s) and operative to generate a dynamic multi-path indication signal for detecting dynamic multi-path.

Dynamic multi-path detection device and method

An electrical isolation barrier for use in a Data Access Arrangement uses a high frequency (HF) transformer 24 to provide isolation. An input signal, which may be analog or digital, is connected to a modulator. The analog output of the modulator is connected to the input of the HF transformer. The output of the HF transformer is connected to the input of a demodulator. Simple amplitude modulation can be used in the modulator to modulate the input signal to the frequency range of operation of the HF transformer. A simple low pass filter may be incorporated in the demodulator to remove harmonic distortion caused by the HF transformer. The output signal of the demodulator is substantially the same as input signal.

Data access arrangement using a high frequency transformer for electrical isolation

A device and method are provided for implementing digital baseband separation of composite video signals with reduced memory requirements. The method and device require that only the composite signal be stored in a large delay element. Multiple quadrature demodulators are employed to generate multiple delayed complex baseband signals. Therefore, no large complex baseband delay element is required.

Optimized structure for digital separation of composite video signals

A device for use in a modem configuration that enables the transfer of data from a host signal processor (HSP) to an A/D-D/A converter or CODEC with less data loss, with low noise and that can send data at varying carrier frequencies without changing the size of the buffers. The device further allows for data transfer that is flexible with any given modulation scheme, carrier frequency or baud frequency to conform with the V.34, V90, as well as prior and subsequent recommendations. The device further includes a counter for counting the number of data samples transferred between the CODEC and the HSP and for alerting the HSP to avoid an overflow condition. The counter is further configured to count beyond the physical size of the buffer in order to simplify operation in an overflow condition. A transmit buffer is included for transferring data from the HSP to the CODEC. Communicating with the HSP and the CODEC is another counter that, similar to the first counter, counts the data sent from the HSP to the CODEC. A threshold is established to activate a null signal generator connected to the output of the transmit buffer by a switch to send a null signal to the CODEC when there is no data in the transmit buffer to help maintain the communication link between the CODEC and the data transfer system at lower power. Once data is again available in the transmit buffer, the switch resumes communication between the transmit buffer and the CODEC. Furthermore, the transmit buffer is synchronized with the receive buffer to allow seamless echo cancellation procedures to be performed by the HSP. The echo cancellation performed by the HSP can now be consistent both during normal operation as well as while the receive buffer is in an overflow condition.

Data communication device

A method and device are provided that allow computation of multiple modulus conversion (MMC) outputs using little or no division operations. Instead of division operations, multiplication and logical shift operations are used to produce pseudo-quotients and pseudo-remainders, which may be corrected in a final step to produce correct MMC outputs. This allows for more efficient implementation, since division is typically less efficient than multiplication and logical shift. The method and device operate on MMC inputs that may be partitioned into sub-quotients of varying numbers of digits in any numbering system. The multiplication and logical shift operations are performed on each of the sub-quotients according to a procedure derived from long-division techniques.

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Cupertino, CA, United States of America

Ping Dong