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| Number | Title | Issue Date |
| 8405532 | Asynchronous sample rate converter Systems and methods for asynchronous sample rate conversion are provided that allow time-varying arbitrary sample ratios. An uncorrected ratio between two arbitrary sample rates is corrected and subsequently used to perform an efficient sample rate conversion on the... | 03/26/2013 |
| 8289195 | Fractional rate resampling filter on FPGA A programmable logic device can be configured as a fractional rate resampling filter capable of performing downsampling prior to upsampling without modifying the overall filter response. Input data may be received at a first sample rate and may be downsampled to gen... | 10/16/2012 |
| 8253610 | Systems and methods for variable rate conversion Poly-phase filters are used to offer an efficient and low complexity solution to rate conversion. However, they suffer from inflexibility and are not easily reconfigured. A novel design for rate converters employ poly-phase filters but utilize interpolation between ... | 08/28/2012 |
| 8217812 | Adjustable sampling rate converter Techniques of this disclosure provide for adjustment of a conversion rate of a sampling rate converter (SRC) in real-time. The SRC determines relative timing of generated output samples based on non-approximated integer components that are recursively updated. The S... | 07/10/2012 |
| RE43489 | Systems and methods for implementing a sample rate converter using hardware and software to maximize speed and flexibility Systems and methods for converting a digital input data stream from a first sample rate to a second, fixed sample rate using a combination of hardware and software components. In one embodiment, a system includes a rate estimator configured to estimate the sample ra... | 06/26/2012 |
| 8169345 | Methods and systems for processing digital data rate and directional playback changes Various methods and systems permit digital data, such as video data, audio/video data, audio/video/subpicture data and the like, to be processed in a manner that permits playback at different speeds in both forward and reverse directions. Various embodiments are als... | 05/01/2012 |
| 8154430 | Digital recording apparatus and method, digital reproduction apparatus and method, and digital data conversion apparatus A digital recording apparatus for recording 1-bit digital audio data of a first sampling frequency on a recording medium in accordance with the recording format of multi-bit PCM data of a second sampling frequency includes a storage section to which input 1-bit digi... | 04/10/2012 |
| 8149146 | Automatic power control system for optical disc drive and method thereof An automatic power control system, an automatic power control method, a down sampling circuit and a down sampling method. The automatic power control system is incorporated in an optical disc drive comprising a laser diode for receiving a control signal to generate ... | 04/03/2012 |
| 8094046 | Signal processing apparatus and signal processing method Disclosed herein is a signal processing apparatus including: a first decimation processing section for generating, based on a digital signal in a first form, a digital signal in a second form; a second decimation processing section for generating, based on the digit... | 01/10/2012 |
| 8089377 | Method and apparatus of performing sample rate conversion of a multi-channel audio signal A method and apparatus are disclosed for performing sampling rate conversion of an audio signal from a first sampling rate to any of a plurality of higher sampling rates using a single set of low-pass filter coefficients. Sampling rate conversion is accomplished by ... | 01/03/2012 |
| 8089378 | Synchronous multi-clock protocol converter Some of the embodiments of the present disclosure provide a method of transferring data from a fast clock domain associated with a fast clock signal to a slow clock domain associated with a slow clock signal, the method comprising receiving first fast data from the ... | 01/03/2012 |
| 7994947 | Method and apparatus for generating a target frequency having an over-sampled data rate using a system clock having a different frequency Method and apparatus for generating a target frequency having an over-sampled data rate using a system clock having a different frequency are disclosed. In one aspect of the present disclosure, the circuit includes, a digital phase locked loop coupled to the system ... | 08/09/2011 |
| 7948405 | Sample rate converter A sample rate converter circuit receives a first signal at a first sampling frequency and for outputs a second signal, representative of the first signal, having a second sampling frequency. The sample rate converter comprises: a buffer, for storing data samples rec... | 05/24/2011 |
| 7920078 | Systems and methods for variable rate conversion Poly-phase filters are used to offer an efficient and low complexity solution to rate conversion. However, they suffer from inflexibility and are not easily reconfigured. A novel design for rate converters employ poly-phase filters but utilize interpolation between ... | 04/05/2011 |
| 7864080 | Sample rate conversion by controlled selection of filter outputs A sample rate converter in which filtering is decomposed into phases as permitted by zero padding is described. The outputs of the phases are issued in the correct sequence to provide the resampled sequence. ... | 01/04/2011 |
| 7859435 | Method for rate increase and method for rate reduction A method for a rate increase and a method for a rate reduction of a sampling input sequence into a sampling output sequence is provided. The sampling input sequence is subjected to signal processing. Signal processing maps a spreading with a first factor and an inte... | 12/28/2010 |
| 7852239 | Method and system for processing multi-rate audio from a plurality of audio processing sources One or more circuits in a mobile phone may be utilized for up sampling two or more audio signals to a same data sampling rate. Each audio signal, such as digital audio, voice, and polyringer, for example, may be received at one of a plurality of data sampling rates ... | 12/14/2010 |
| 7834780 | Waveform compression and display A waveform compression and display technique saves both a peak detected version (background version) and a decimated/lowpass filtered version (foreground version) of a sampled electrical signal. The two versions are displayed simultaneously overlaid together in a co... | 11/16/2010 |
| 7804429 | Multiple stream multiple rate resampling A method of resampling a digital signal involves serially receiving a plurality of samples of said digital signal and applying a plurality of filter coefficients to a first subset of the plurality of samples to generate a first plurality of intermediate results and ... | 09/28/2010 |
| 7791508 | Enhanced control for compression and decompression of sampled signals Control of signal compression is coordinated by selectively modifying control parameters affecting the bit rate, sample rate, dynamic range and compression operations. Selected control parameters are modified according to a control function. The control function can... | 09/07/2010 |
| 7764204 | Digital-to-analog converting system with sampling rate conversions and sampling rate converting method thereof A digital-to-analog converting system with sampling rate conversions includes an interpolator, S orders of operating and filtering units, an up-converting and down-converting circuit, and a signal processing circuit. The interpolator performs an N-times interpolatio... | 07/27/2010 |
| 7728743 | Device and method for polyphase resampling A methods and devices for polyphase resampling are presented which may comprise a coefficient generator which provides a plurality of coefficients and an interpolation arrangement used to carry out the resampling by means of the coefficients applied to input data pr... | 06/01/2010 |
| 7724162 | Circuit for sample rate conversion The present invention is related to a circuit for converting the sample rate of a digital signal, comprising an input for applying the digital signal, a conversion filter having either a symmetrical or anti-symmetr... | 05/25/2010 |
| 7719446 | Method and apparatus for computing interpolation factors in sample rate conversion systems The invention allows the interpolation factor, a critical parameter in sample rate conversion systems, to be computed in a real-time system where there is a complex relationship between a DSP clock and the data clocks. Typically, two or three of the clocks in such a... | 05/18/2010 |
| 7714751 | Transcoder controlling generated codes of an output stream to a target bit rate A transcoder calculates a reference conversion factor on the basis of a ratio between a total target bit rate of a whole second stream and an total input bit rate of a whole first stream and calculates a coefficient of variation from the total target bit rate of the... | 05/11/2010 |
| 7714750 | Audio processing circuit and method An audio processing circuit includes a clock synthesizer, a clock divider, a digital interpolator module, a sampling rate converter and a digital-to-analog converter. The clock synthesizer generates a base clock signal according to a sampling clock signal and a firs... | 05/11/2010 |
| 7619546 | Asynchronous sample rate conversion using a digital simulation of an analog filter The sample rate of a digital signal is converted by a digital simulation of an analog filter. The simulation can update the states of complex poles in the analog filter at arbitrary times using different techniques. One technique updates the states at variable rates... | 11/17/2009 |
| 7609181 | Sampling frequency conversion apparatus In a sampling frequency conversion apparatus, an input sample register stores a predetermined number of input samples as an original sequence of input samples for an interpolative operation. A coefficient generating part prepares a first sequence of interpolative co... | 10/27/2009 |
| 7605724 | Method and apparatus for a transmission signal up-converting filter A digital up-sampling converter (DUSC) employs a signal input provided by a digital signal process (DSP) at a first rate feeding a Square Root Raised Cosine (SRRC) filter which provides for table look up of filter coefficients for a multiple symbol span and provides... | 10/20/2009 |
| 7592932 | Method and device for interpolating or decimating a signal A method and a device for interpolating or decimating a signal is provided, the signal being processed by a plurality of signal processing means connected in series, which at least comprise means for increasing or reducing a clock rate of the signal and filtering me... | 09/22/2009 |
| 7592933 | Techniques for 9B10B and 7B8B coding and decoding A technique for encoding 9-binary symbol (9B) source vectors into 10-binary symbol (10B) encoded vectors include the steps of obtaining a plurality of 9B source vectors, and encoding the 9B source vectors into a plurality of 10B encoded vectors according to an encod... | 09/22/2009 |
| 7561077 | Multiple stream multiple rate resampling component A method of resampling a digital signal involves serially receiving a plurality of samples of said digital signal and applying a plurality of filter coefficients to a first subset of the plurality of samples to generate a first plurality of intermediate results and ... | 07/14/2009 |
| 7561076 | Front-end method for NICAM encoding A NICAM encoding method comprises performing NICAM processing and coupling a front-end to the NICAM processing. The front-end processing operates with a system clock that is integer divisible such that the system clock can be used by both the NICAM processing and th... | 07/14/2009 |
| 7554465 | Sampling rate conversion system A sampling rate conversion system reduces the signal processing burdens carried by cellular phones, headsets, and other electronic devices. Because the system consumes fewer resources to convert between signal sampling rates, the system may significantly reduce proc... | 06/30/2009 |
| 7535385 | Time base adjustment in a data processing device A data processing device and adjusting method for adjusting the timing of a higher-rate stream of second data samples derived from a lower-rate stream of first data samples are described. A predetermined one of the first data samples is stored and first predetermine... | 05/19/2009 |
| 7528745 | Digital domain sampling rate converter Techniques are described for sampling rate conversion in the digital domain by up-sampling and down-sampling a digital signal according to a selected intermediate sampling frequency. A prototype anti-aliasing filter that has a bandwidth with multiple factors is stor... | 05/05/2009 |
| 7522074 | Enhanced control for compression and decompression of sampled signals Control of signal compression is coordinated by selectively modifying control parameters affecting the bit rate, sample rate, dynamic range and compression operations. Selected control parameters are modified according to a control function. The control function can... | 04/21/2009 |
| 7515073 | Digital sample rate conversion Embodiments of an apparatus for sample rate conversion are described. Various embodiments include an interpolator configured to interpolate a digital input data stream by using values of an interpolation phase shift control quantity to generate a digital output data... | 04/07/2009 |
| 7508327 | Integer representation of relative timing between desired output samples and corresponding input samples In general, this disclosure describes techniques for changing a sampling frequency of a digital signal. In particular, the techniques provide a more accurate way to determining a relative timing between a desired output sample and a corresponding input sample using ... | 03/24/2009 |
| 7498957 | Jitter-free sample rate conversion A method and apparatus are described for asynchronous sample rate conversion, in particular those which use an interpolating filter, especially a polyphase interpolating filter (FB4). The input and output signals have jitter but the polyphase branch signals h... | 03/03/2009 |
