Patent application number | Description | Published |
20120226505 | HIERARCHICAL AUDIO CODING, DECODING METHOD AND SYSTEM - A hierarchical audio coding, decoding method and system are provided. The method includes dividing frequency domain coefficients of an audio signal after MDCT into a plurality of coding sub-bands, quantizing and coding amplitude envelope values of coding sub-bands; allocating bits to each coding sub-band of the core layer, quantizing and coding core layer frequency domain coefficients to obtain coded bits of core layer frequency domain coefficients; calculating the amplitude envelope value of each coding sub-band of the core layer residual signal; allocating bits to each coding sub-band of the extended layer, quantizing and coding the extended layer coding signal to obtain coded bits of the extended layer coding signal; multiplexing and packing amplitude value envelope coded bits of each coding sub-band composed by core layer and extended layer frequency domain coefficients, core layer frequency coefficients coded bits, and extended layer coding signal coded bits, then transmitting to the decoding end. | 09-06-2012 |
20120259644 | Audio-Encoding/Decoding Method and System of Lattice-Type Vector Quantizing - The audio coding method and system of lattice vector quantization is provided in the invention. The method comprises: dividing frequency domain coefficients of an audio signal for which a modified discrete cosine transform (MDCT) has been performed into a plurality of coding sub-bands, and quantizing and coding an amplitude envelope value of each coding sub-band to obtain coded bits of amplitude envelopes; performing bit allocation on each coding sub-band, and performing normalization, quantization and coding respectively on vectors in a low bit coding sub-band with pyramid lattice vector quantization and on vectors in a high bit coding sub-band with sphere lattice vector quantization to obtain coded bits of the frequency domain coefficients; multiplexing and packing the coded bits of the amplitude envelope and the coded bits of the frequency domain coefficients of each coding sub-band, then sending them to a decoding side. | 10-11-2012 |
20120323582 | Hierarchical Audio Frequency Encoding and Decoding Method and System, Hierarchical Frequency Encoding and Decoding Method for Transient Signal - Hierarchical audio coding and decoding method and system and hierarchical audio coding and decoding method for transient signals are provided. In the present invention, by introducing a processing method for transient signal frames in the hierarchical audio coding and decoding methods, a segmented time-frequency transform is performed on the transient signal frames, and then the frequency-domain coefficients obtained by transformation are rearranged respectively within the core layer and within the extended layer, so as to perform the same subsequent coding processes, such as bit allocation, frequency-domain coefficient coding, etc., as those on the steady-state signal frames, thus enhancing the coding efficiency of the transient signal frames and improving the quality of the hierarchical audio coding and decoding. | 12-20-2012 |
20130006644 | METHOD AND DEVICE FOR SPECTRAL BAND REPLICATION, AND METHOD AND SYSTEM FOR AUDIO DECODING - The present invention relates to a method and device for spectral band replication, and a method and system for audio decoding, and the method for spectral band replication comprises: A. searching for the position of a certain tone of an audio signal in MDCT frequency domain coefficients; B. according to the tone position, determining a spectral band replication period which is a bandwidth from a 0 frequency point to a frequency point of tone position, and a source frequency segment which is a frequency segment from a frequency point of the 0 frequency point shifting copyband_offset frequency points backwards to a frequency point of the frequency point of the tone position shifting the copyband_offset frequency points backwards, wherein said offset copyband_offset is greater than or equal to 0; and C. according to the spectral band replication period, carrying out spectral band replication on zero bit encoding subbands. | 01-03-2013 |
20130006645 | METHOD AND SYSTEM FOR AUDIO ENCODING AND DECODING AND METHOD FOR ESTIMATING NOISE LEVEL - The present invention relates to a method and system for audio encoding and decoding and a method for estimating a noise level, and the method for estimating a noise level in the present invention comprises: estimating a power spectrum of an audio signal to be encoded according to a frequency domain coefficient of the audio signal to be encoded; and estimating a noise level of a zero bit encoding subband audio signal according to the power spectrum obtained by calculating, and this noise level for controlling an energy proportion of noise filling to spectral band replication during decoding; wherein a zero bit encoding subband refers to an encoding subband of which allocated bit number is zero. The present invention can well reconstruct the uncoded frequency domain coefficients. | 01-03-2013 |
Patent application number | Description | Published |
20120169306 | VOLTAGE REGULATOR STRUCTURES AND METHODS WITH BOOTSTRAPPED BIAS CAPACITOR - Voltage regulator structures and methods embodiments are provided which employ a high-side N-type switching transistor to thereby enhance system efficiency and also reduce the die area required by these regulator structures. This structure and its advantages, however, require a gate drive signal higher than the input voltage of the voltage regulator. The embodiments resolve this need with a bias capacitor in a bootstrapped arrangement and a control loop arranged to maintain a bias voltage across the capacitor sufficient to always insure rapid switching of the high-side switching transistor during a pulse-width modulation (PWM) operational mode. The embodiments further include a second control loop arranged to insure sufficient voltage across the capacitor during a pulse-frequency modulation (PFM) operational mode. | 07-05-2012 |
20120249106 | STABILITY METHODS AND STRUCTURES FOR CURRENT-MODE DC-DC VOLTAGE CONVERTERS - DC-DC voltage converter structures and methods are provided that employ first and second transistors which are switched to control currents through an inductor and a capacitor to thereby provide an output voltage substantially equal to a predetermined reference voltage. Preferably included is a voltage feedback loop in which an error voltage is fed back to a loop comparator and further included is a current feedback loop that provides to the comparator a first voltage ramp whose amplitude is proportional to the amplitude of the converter's input current. The output signal of the comparator sets the duty cycles of the first and second transistors. In each converter period, the first and second transistors of the voltage converter respectively control, through the inductor, a first current with a rising slope and a second current with a falling slope. Finally, converter stability is enhanced by providing a second voltage ramp having a slope related to a fraction (e.g., ½) of the falling slope and then comparing the error voltage of the voltage feedback loop to the sum of the first and second voltage ramps. | 10-04-2012 |
20120268095 | DC-DC VOLTAGE CONVERTER SYSTEM WITH A HIGH-EFFICIENCY PULSE-SKIP OPERATIONAL MODE - DC-DC voltage converter systems are provided in which a switching voltage converter is arranged with an inductor to switch first and second currents with duty cycles D and D′ determined by an error voltage V | 10-25-2012 |
20140253061 | SKIP MODE METHOD AND SYSTEM FOR A CURRENT MODE SWITCHING CONVERTER - A method and system to inhibit the switching of a current mode switching converter having high and low side switching elements coupled to an output inductor, the other end of which is coupled to an output node, and operated with respective modulated switching signals to regulate an output voltage Vout produced at the node. A current I | 09-11-2014 |