Amlogic Co., Limited

Amlogic (shanghai) Co., Ltd.

Other

Jinhong Zhang

Jin Niu

Chun Wang

Xiaotong Liu

Guogang Li

Shixi Bu

Jiye Ye

The present invention relates to the field of voice activity detection technologies, and more particularly, to a voice activity detection method. The method comprises: providing an acquisition unit for acquiring an external sound signal; providing a judgment unit for judging whether the sound signal is a voice signal; if the sound signal is a voice signal, starting a voice processing unit for processing the sound signal; if the sound signal is not a voice signal, the voice processing unit is kept in a sleep state. With the voice activity detection method, the voice processing unit with large power consumption is made to be in a sleep state for a long time, and therefore, the entire system can be kept in a low-power consumption state; the voice activity detection method is low in implementation cost and can obtain better performance with a small amount of calculation and less resource consumption.

Voice activity detection method

The invention relates to the field of channel coding and modulation technique, more specifically, to a single-carrier channel estimation method, comprising: equalizing a carrier of an input current-frame signal and of a channel of the current-frame signal, to obtain a sequence code of the current-frame signal, decision value of transmission sequence of the current-frame signal and estimated value of signal-to-noise ratio of the current-frame signal; calculating the current-frame signal, the sequence code and the estimated value of signal-to-noise ratio to obtain a initial channel estimation; calculating the current-frame signal, the decision value of transmission sequence and the estimated value of signal-to-noise ratio to obtain a reference channel; obtaining a filtered channel value after filtering the reference channel; and obtaining the estimated channel of the next-frame signal after implementing adaptive filtering on the estimated value of initial channel and filtered channel value, by reference to the reference channel.

Single-carrier channel estimation method

The invention relates to the field of the equalizer, more specifically, to a single carrier equalizer and a receiver system comprises the single carrier equalizer. It is used to gradually improve the performance of the frequency domain equalizer by the way of iterations. The present invention uses an iterative updater to conduct a first iteration based on the frequency domain value of the input signal and the frequency domain value of the channel of the input signal, and transmits the iteration result to the inverse fast Fourier transformer. And the signal decision device is used to judge the value of the output of the inverse fast Fourier transformer, and the output signal of the signal decision device is transmitted to the fast Fourier transformer and the iterative updater respectively.

Single carrier equalizer and a receiver system comprising the single carrier equalizer

The invention relates to the field of terrestrial broadcast transmission, more specifically, to a channel estimation method. A channel estimation method used for estimating a channel of a next carrier signal frame, the channel estimation method comprising: equalizing a carrier of the current signal frame and of the channel of the current signal frame, to obtain a transmission sequence of the current signal frame and a signal-to-noise ratio of the current signal frame, calculating the transmission sequence to get the reference channel, generating an initial channel estimation based on the signal-to-noise ratio of the signal frame, processing the estimated initial channel and the reference channel by an adaptive filtering method, to obtain an estimated channel of next signal frame.

Channel estimation method

A method and system for pseudorandom noise ('PN') phase detection in digital terrestrial multimedia broadcast ('DTMB') receivers. This method selects a detection range of symbols from a frame of the received signal; applies FFT to the PN portion of each of the symbols in the detection range to generate H(k); applies phase rotation to H(k) to obtain phase rotatedfor the PN portion of the symbols in the detection range; applies differential operations toto generate H; sums the Hto generated H; calculates a value Q as a function of H; and determines the PN phase offset as a function of Q and a predefined threshold.

Methods and systems for optimal PN phase detection in DTMB receivers

A method for demapping a multicarrier signal into soft bits by a receiver, comprises the steps of: calculating signal to noise ratio ('SNR') adjustment factors ('A[segidx]') for segments of the signal, wherein each of the segments has a predefined number of subcarriers of the signal; generating an adjusted SNR (&#x201c;SNR[segidx]&#x201d;) as a function of an average SNR over the subcarriers of the signal and of the calculated SNR adjustment factors; and determining the soft bits for the signal as a function of the signal, a channel estimation for the signal, and the adjusted SNR, wherein the receiver decodes the determined soft bits.

Methods and systems for demapping a multi-carrier signal

A method for determining timing synchronization for demodulating a signal by a receiver, comprises the steps of: generating a channel response for the signal; transforming the signal into the time domain using an inverse fast fourier transform ('IFFT'); determining a signal power for the transformed signal as a function of the generated channel response; and calculating the timing synchronization by the receiver as a function of the determined signal power.

Methods and systems for fine timing synchronization

A method for processing a signal by a receiver, comprises the steps of: receiving the signal by the receiver, calculating one or more symbols based on the received signal; determining a multipath delay spread from the received signal; rebuilding one or more of the calculated symbols as a function of the multipath delay spread; and processing the rebuilt symbols for decoding by the receiver.

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Shanghai, China

Jinhong Zhang