50 results about "Bandwidth extension" patented technology

The invention belongs to the technical field of integrated circuits, and particularly relates to a radio frequency amplifier bandwidth expansion circuit based on resistor-capacitor series feedback. The bandwidth expansion circuit comprises a first-stage common-gate amplifier, a second-stage common-source amplifier, a transformer-based inter-stage matching network between the two stages of amplifiers, and two resistor-capacitor series feedback paths, and a resistor-capacitor series feedback path is bridged at two sides of the interstage matching network, and feedback is introduced from the output end of the common source amplifier to the output end of the common gate amplifier, so that the quality factors of two resonant cavities of the interstage matching transformer are adjusted, and the targets of adjusting the gain of the amplifier and expanding the bandwidth of the radio frequency amplifier are further realized.

There is provided a system, apparatus and a method for audio processing. The operations include obtaining an input audio waveform, obtaining a mel-spectrogram by performing a short-time Fourier transform (STFT) operation on the input audio waveform, obtaining an updated mel-spectrogram by at least one or removing noise from the mel-spectrogram or restoring high frequency components by applying two-dimensional Unet convolutional blocks to the mel-spectrogram, converting the updated mel-spectrogram to a converted audio waveform in a waveform domain, correcting the converted audio waveform in a time domain, correcting the converted audio waveform in a frequency domain to remove artifacts or noise, processing the corrected audio waveform corrected in the time domain and corrected in the frequency domain with an one-dimensional convolutional layer, and outputting the processed audio waveform in the time domain and in the frequency domain.

A station that wirelessly communicates is disclosed. The station comprises: a transceiving unit; and a processor. The processor determines whether a sub-channel not included in a frequency band of a transmit opportunity (TXOP) within the TXOP acquired by the station is in an extendable state, and performs frame exchange in the frequency band of the TXOP and a frequency band including the sub-channel when the sub-channel is in the extendable state.

Techniques for speech bandwidth extension and denoising. The techniques integrate data-driven artificial intelligence (AI) models specifically trained to be robust to myriad of distortions. The system is capable of producing high-fidelity wideband speech from real-life narrowband inputs. The output is consistently preferred by listeners over the narrowband input, as well as over denoising alone.

A method and system for bandwidth extension of a critical sampling circuit, belonging to the field of signal sampling technology. The implementation method is as follows: S1, estimating the model coefficients of the squared amplitude response of the simulated channel of the critical sampling circuit through ultra-relaxed primordial duality, constructing the simulated channel response matrix, and obtaining the system response matrix by row decimation; S2, establishing the high-dimensional response matrix of the critical sampling circuit and completing parameter initialization; S3, performing iterative calculation of the extension features through elastic network regression, checking the convergence of the extension residual or the number of iterations, if satisfied, proceeding to S4, otherwise continuing iteration; S4, reconstructing the high-dimensional signal using the extension features calculated in S3, and obtaining the reconstructed signal after bandwidth extension of the critical sampling circuit through sampling rate conversion. This invention, by iteratively calculating the spectral characteristics within the target extended bandwidth of the critical sampling circuit, can recover out-of-band lost spectral information without increasing the sampling clock frequency and analog input bandwidth, achieving low-cost high-frequency signal sampling.

A circuit for inductive peaking may include a driver, an inverter, a resistor between an output node of the driver and an input node of the inverter and a switch. For example, a first node of the resistor may be connected to the output node of the driver and a second node of the resistor may be connected to the input node of the inverter. The switch may be connected between an output node of the inverter and the first node of the resistor. An input node of the driver may correspond to an input node of the circuit and the output node of the driver may correspond to an output node of the circuit.

The application provides a high-balance active balun circuit, which comprises an RF signal input port, a signal input matching stage, a single-end to differential circuit and an output load stage, wherein the signal input matching stage comprises a first transistor, a second transistor, an input resistor and an input inductor, and the single-end to differential circuit comprises a third transistor, a fourth transistor, a fifth transistor and a capacitor. The application does not need to waste chip area to make a complex matching circuit. When the circuit is connected in the front stage, the circuit will not cause the problem that power cannot be transmitted due to high-frequency reflection. The phase adjusting inductor is introduced into the circuit, and the frequency phase characteristics of the inductor are used to compensate the phase imbalance of the differential output. The bandwidth extension technology is used in the load, so that the phase shifter maintains the flatness of the gain in a wide frequency. Meanwhile, the two-stage cascade transistor is used to realize the single-end input to differential output gain stage architecture, which is more suitable for low-voltage application.

Encoder for coding an audio signal comprising a band-limited signal portion and an extended-band signal portion, the encoder comprising: a baseband encoder configured to encode the band-limited signal portion, wherein the baseband encoder comprises at least one learnable layer; and a bandwidth extension encoder comprising a linear prediction entity for performing linear prediction on the extended band signal portion.

Encoder (10) for coding a signal comprising a band-limited signal and an extended-band signal, the encoder (10) comprising: a calculator (12) configured to perform energy prediction of the extended-band signal based on LPC coefficients; and a coder (14) configured to encode a residual of the signal using the energy prediction and an offset (o); wherein the offset (o) is dependent on a bit-rate.

Apparatus for processing an audio scene representing a sound field, the audio scene comprising information on a transport signal and a set of parameters. The apparatus comprising an output interface for generating a processed audio scene using the set of parameters and the information on the transport signal, wherein the output interface is configured to generate a raw representation of two or more channels using the set of parameters and the transport signal and a multichannel enhancer for generating an enhancement representation of the two or more channels using the transport signal, and a signal combiner for combining the raw representation of the two or more channels and the enhancement representation of the two or more channels to obtain the processed audio scene.

This application provides an audio encoding method and an encoding device. The method includes: obtaining a current frame includes a high frequency band signal and a low frequency band signal; performing first encoding on the high frequency band signal and the low frequency band signal, to obtain a first encoding parameter; performing second encoding on the high frequency band signal to obtain a second encoding parameter which indicates information about a tonal component of the high frequency band signal; adjusting, based on the information, a spectrum of a high frequency band signal obtained through bandwidth extension, to obtain an adjusted spectrum of the high frequency band signal; performing third encoding based on the adjusted spectrum of the high frequency band signal to obtain a third encoding parameter.

Encoder for coding an audio signal comprising a band-limited signal portion and an extended-band signal portion, the encoder comprising: a baseband encoder configured to encode the band-limited signal portion, wherein the baseband encoder comprises at least one learnable layer; and a bandwidth extension encoder comprising a linear prediction entity for performing linear prediction on the extended band signal portion.

An audio processing method includes: filtering an audio signal to obtain a low-frequency signal and a high-frequency signal; encoding the low-frequency signal to obtain a bitstream of the low-frequency signal; performing frequency domain transform on the low-frequency signal and the high-frequency signal respectively, to obtain a low-frequency spectrum and a high-frequency spectrum; performing spectral envelope extraction on the low-frequency spectrum and the high-frequency spectrum to obtain spectral envelope information, and performing spectral flatness extraction on the high-frequency spectrum to obtain spectral flatness information; and performing quantization encoding on the spectral flatness information and the spectral envelope information to obtain a bandwidth extension bitstream, and combining the bandwidth extension bitstream and the bitstream of low-frequency signal into an encoded bitstream.

A method for extending a frequency band of an audio signal, which is performed by a decoding device and includes: receiving a bit stream sent by an encoding device, and obtaining a decoded audio frequency domain signal by decoding the bit stream; and in response to a highest frequency point with a bit allocation in the audio frequency domain signal being lower than a starting frequency point of a preset bandwidth extension frequency band, or a frequency band with a bit allocation in the audio frequency domain signal being smaller than a preset bandwidth extension starting frequency band, predicting a frequency spectrum signal between the highest frequency point with the bit allocation and a highest frequency point of the preset bandwidth extension frequency band based on a frequency spectrum signal within a predetermined frequency band range or a predetermined frequency point range in the audio frequency domain signal.

An audio signal encoding method includes obtaining a current frame of an audio signal, where the current frame includes a high frequency band signal and a low frequency band signal; obtaining a parameter of bandwidth extension of the current frame based on the high frequency band signal, the low frequency band signal, and configuration information of the bandwidth extension; obtaining tile information, where the tile information indicates a first frequency range in which tonal component detection needs to be performed on the high frequency band signal; performing tonal component detection in the first frequency range to obtain information about a tonal component of the high frequency band signal; and performing bitstream multiplexing on the parameter of the bandwidth extension and the information of the tonal component to obtain a payload bitstream.

For a bandwidth extension of an audio signal, in a signal spreader the audio signal is temporally spread by a spread factor greater than 1. The temporally spread audio signal is then supplied to a decimator to decimate the temporally spread version by a decimation factor matched to the spread factor. The band generated by this decimation operation is extracted and distorted, and finally combined with the audio signal to obtain a bandwidth extended audio signal. A phase vocoder in the filterbank implementation or transformation implementation may be used for signal spreading.

An audio decoder for providing at least four bandwidth extended channel signals based on an encoded representation is configured to provide a first downmix signal and a second downmix signal based on a jointly encoded representation of the first downmix signal and the second downmix signal using multi-channel decoding. The audio decoder is configured to provide at least a first audio channel signal and a second audio channel signal based on the first downmix signal using multi-channel decoding. The audio decoder is configured to provide at least a third audio channel signal and a fourth audio channel signal based on the second downmix signal using multi-channel decoding. The audio decoder is configured to perform multi-channel bandwidth extension based on the first audio channel signal and the third audio channel signal to obtain a first bandwidth extended channel signal and a third bandwidth extended channel signal. The audio decoder is configured to perform multi-channel bandwidth extension based on the second audio channel signal and the fourth audio channel signal to obtain a second bandwidth extended channel signal and a fourth bandwidth extended channel signal. The audio encoder uses related concepts.

A method for personalized bandwidth extension in an audio device. The method comprises obtaining an input microphone signal with a first bandwidth, obtaining a first user parameter indicative of one or more characteristics of a user of the audio device, determining, based on the first user parameter, a bandwidth extension model, and generating an output signal with a second bandwidth by applying the determined bandwidth extension model to the input microphone signal.

For a bandwidth extension of an audio signal, in a signal spreader the audio signal is temporally spread by a spread factor greater than 1. The temporally spread audio signal is then supplied to a decimator to decimate the temporally spread version by a decimation factor matched to the spread factor. The band generated by this decimation operation is extracted and distorted, and finally combined with the audio signal to obtain a bandwidth extended audio signal. A phase vocoder in the filterbank implementation or transformation implementation may be used for signal spreading.

The technical scheme of the invention discloses a bandwidth expansion circuit applied to a high-speed interface equalizer. Aiming at the problem of insufficient compensation capability of the bandwidth expansion technology under the condition of relatively large input parasitic capacitance introduced by a load, an inductor is cascaded between a CTLE module and a VGA module, and the resonance effect of the series peaking inductor and the parasitic capacitance is utilized, so that the bandwidth expansion is realized; aiming at the bandwidth expansion requirement under the condition of high speed and large load, a series peaking inductor is combined with a parallel peaking inductor in the prior art, and the bandwidth of the CTLE module is pushed to higher frequency; in order to solve the problem that a passive inductor occupies a large area, an inverter composed of MOS tubes is designed to achieve an active inductor, the chip area is effectively reduced, and the system design requirement is met.

In one embodiment of the present invention, a method of decoding an encoded audio bitstream and generating frequency bandwidth extension includes decoding the audio bitstream to produce a decoded low band audio signal and generate a low band excitation spectrum corresponding to a low frequency band. A sub-band area is selected from within the low frequency band using a parameter which indicates energy information of a spectral envelope of the decoded low band audio signal. A high band excitation spectrum is generated for a high frequency band by copying a sub-band excitation spectrum from the selected sub-band area to a high sub-band area corresponding to the high frequency band. Using the generated high band excitation spectrum, an extended high band audio signal is generated by applying a high band spectral envelope. The extended high band audio signal is added to the decoded low band audio signal to generate an audio output signal having an extended frequency bandwidth.

For a bandwidth extension of an audio signal, in a signal spreader the audio signal is temporally spread by a spread factor greater than 1. The temporally spread audio signal is then supplied to a decimator to decimate the temporally spread version by a decimation factor matched to the spread factor. The band generated by this decimation operation is extracted and distorted, and finally combined with the audio signal to obtain a bandwidth extended audio signal. A phase vocoder in the filterbank implementation or transformation implementation may be used for signal spreading.

For a bandwidth extension of an audio signal, in a signal spreader the audio signal is temporally spread by a spread factor greater than 1. The temporally spread audio signal is then supplied to a decimator to decimate the temporally spread version by a decimation factor matched to the spread factor. The band generated by this decimation operation is extracted and distorted, and finally combined with the audio signal to obtain a bandwidth extended audio signal. A phase vocoder in the filterbank implementation or transformation implementation may be used for signal spreading.

This application relates to the field of servo control technology, and in particular to a method, apparatus, and device for extending the bandwidth of a servo system. The method includes: acquiring speed data, current data, and panel gain data of the servo system; identifying speed loop parameters of the servo system based on the speed data, current data, and panel gain data; identifying low-frequency rigid body model parameters based on the speed data; identifying high-frequency flexible model parameters based on the speed data; constructing a speed loop controlled object model based on the low-frequency rigid body model parameters and the high-frequency flexible model parameters; and extending the bandwidth of the servo system based on the speed loop controlled object model and the speed loop parameters. This solves the problems of limited bandwidth extension and low control accuracy in related technologies for servo closed-loop systems.

This disclosure provides an audio processing method and apparatus, an electronic device, and a computer-readable storage medium. The audio processing method includes: determining flag bit data based on encoded data information of an audio frame, wherein the encoded data information comprises at least one of configuration information of Multiple Description Coding (MDC), configuration information of in-band Forward Error Correction (FEC) encoding or configuration information of Bandwidth Extension (BWE) data (S201); and writing the flag bit data into a bitstream (S202).

For a bandwidth extension of an audio signal, in a signal spreader the audio signal is temporally spread by a spread factor greater than 1. The temporally spread audio signal is then supplied to a decimator to decimate the temporally spread version by a decimation factor matched to the spread factor. The band generated by this decimation operation is extracted and distorted, and finally combined with the audio signal to obtain a bandwidth extended audio signal. A phase vocoder in the filterbank implementation or transformation implementation may be used for signal spreading.

The method for testing the frequency response parameters of a photodetector first involves constructing a testing device, which includes a dual-carrier light source module, a Mach-Zehnder modulator, the photodetector under test (DUT), a microwave signal source, a data acquisition module, and a control and data processing module. The dual-carrier light source module outputs a dual-carrier optical signal, which is fed into the Mach-Zehnder modulator biased at a specific operating point. The modulator is modulated by the output signal from the microwave signal source connected to the RF drive electrode. The optical signal output from the modulator then enters the DUT to generate a photocurrent signal. The control and data processing module keeps the microwave signal source in an on state. Under this condition, the spectrum analysis module obtains the amplitude information of a specific frequency signal in the output optical signal of the DUT. Analysis and calculation yield the frequency response of the DUT. To further extend the test frequency range, the control and data processing module controls the microwave signal source to be in both on and off states. The spectrum analysis module obtains the amplitude information of a specific frequency signal in the output optical signal of the DUT. Analysis and calculation yield the modulation coefficient of the Mach-Zehnder modulator. Subtracting the modulation response from the amplitude information of the specific frequency signal allows for bandwidth extension testing of the DUT's frequency response.

An audio signal, having first and second regions of frequency spectrum, is coded. Spectral peaks in the first region are encoded by a first coding method. For a segment of the audio signal, a relation between energy of bands in the first and second regions is determined. A relation between the energy of the band in the second region and energy of neighboring bands in the second region is determined. A determination is made whether available bits are sufficient for encoding at least one non-peak segment of the first region and the band in the second region. Responsive to first and second relations fulfilling a respective predetermined criterion and a sufficient number of bits, encoding the band in the second region using a second coding method different from the first coding method, and otherwise, subjecting the band in the second region to BandWidth Extension BWE or noise fill.

The present disclosure relates to an anti-aging bandwidth extension device. A circuit for inductive peaking can include a driver, an inverter, a resistor between an output node of the driver and an input node of the inverter, and a switch. For example, a first node of the resistor can be connected to the output node of the driver, and a second node of the resistor can be connected to the input node of the inverter. The switch can be connected between an output node of the inverter and the first node of the resistor. An input node of the driver can correspond to an input node of the circuit, and the output node of the driver can correspond to an output node of the circuit.