208 results about "Sample rate conversion" patented technology

The image scaling memory system of the present invention eliminates the use of internal or external line memories by using an existing frame memory coupled with an input buffer and a plurality of output buffers for providing a vertical scalar with simultaneous parallel access to multiple lines of data. Additionally, the image scaling memory system of the present invention, including the frame memory, is embedded into an integrated circuit. Thus, the image scaling circuit of the present invention improves reliability, lowers cost, and improves silicon area usage. The frame memory is coupled to an input buffer at an input side and a plurality of output buffers at an output side. The plurality of output buffers is positioned between the frame memory and the vertical scalar. Each output buffer sequentially gains access to and transfers portions of image lines from the frame buffer. Each output buffer stores only a portion of an image line resulting in relatively small output buffers. The plurality of output buffers provides the vertical scalar with simultaneous parallel access to multiple lines of buffered digital image data. The frame memory preferably comprises DRAM that stores the image data such that row faults are minimized. The DRAM frame memory preferably includes at least two memory banks, each including a plurality of rows and a plurality of columns. The DRAM frame memory has multiple purposes including storing digital image data frames for sample rate conversion, as well as, storing bitmaps for access by an On Screen Display controller and storing microprocessor data for access by a microprocessor.

Methods for sample rate conversion are provided that use a polynomial interpolator with minimax stopband attenuation. A method for sample rate conversion of an input signal is provided that uses a time-varying polyphase filter having a discrete polyphase index m. Another method for sample rate conversion of an input signal is provided that uses a time-varying polyphase filter having a continuous polyphase index τ. In these methods, an output time index is mapped to an input sample index and the polyphase index, the polynomial coefficients of a polyphase filter are computed using the polyphase index, and the polyphase filter is applied to an input sample at the input sample index to generate the output sample at the output time index.

An embodiment of the present invention provides a phase locked loop that operates on clock signals derived from an RF clock signal generated by the phase locked loop. A frequency reference input provides a reference clock. A controllable oscillator generates the RF clock signal. A phase detection circuit operates on the reference clock to provide digital phase error samples indicative of a phase difference between the reference clock and the RF clock. An interpolator is coupled to the phase detection circuit for performing a sample rate conversion between the reference clock and the clock derived from the RF clock signal.

A receiver for a software defined radio system comprises an input stage for receiving a transmitted signal, an analogue-to-digital converter having a sample rate, a filter matched to the received transmitted signal, and a sample rate converter for converting the digital signal output from the filter from an input sequence having the sample rate of the analogue-to-digital converter to an output sequence having an output sample rate defined by the received transmitted signal. The input and output sequences comprise respectively a number of input samples and a number of output samples. A controller controls the output sample rate and a demodulator coupled to the output of the sample rate converter recovers the transmitted signal. The sample rate converter is implemented by a transposed Farrow structure. The controller is arranged to reset the output sequence from the sample rate converter when any one of said number of input samples and any one of said number of output samples pass through coincidence in time.

In one embodiment, an apparatus includes a first receiver path with a first digitizer to digitize an incoming signal obtained from a radio frequency signal including at least a first desired channel into samples, the first digitizer to operate at a first sampling frequency, a first sample rate converter coupled to an output of the first digitizer to receive the samples at the first sampling frequency and to output the samples at a fixed sampling frequency, and a first digital processor to receive and process the samples at the fixed sampling frequency. The apparatus may further include a controller to receive a frequency change indication and to dynamically control the first sample rate converter to accommodate a change in the first sampling frequency from a first rate to a second rate.

The architecture for a combined universal sample rate converter and a sample clock synchronizer is presented. The universal sample rate converter can be applied, for example, to audio samples created or mixed using any of the standard audio frequencies in the set H={8, 11.025, 22.05, 44.1, 48, 96, and 192} kHz and played back using any other frequency from the set H. The synchronizer can be used where audio data are streamed or otherwise broadcast from, for example, the Internet, along with a system timestamp, and where this timestamp needs to be matched to the local audio clock for proper play-back. The same synchronizer can also be used for audio/video or video only synchronization.

A sampling-rate conversion method receives N input channels which have been digitized at an input sampling rate, and converts the sampling rate of each input channel to produce N output channels at an output sampling rate. The method comprises computing a common FIR interpolating function which depends upon the input and output sample clocks and the instantaneous output time, and applying the common FIR interpolating function to all N input channels to compute all N output channels.

A digital audio system (2) including a digital audio amplifier (8) with reduced AM interference is disclosed. The digital audio amplifier (8) includes a pulse-width-modulation (PWM) processor (10) in which a digital datastream at a sampling frequency is upsampled by an interpolation filter (16) to a multiple of the sampling frequency. The upsampled datastream is applied to a sample rate converter (17) which resamples the upsampled datastream to produce a datastream at a converted sampling frequency, or PWM frame rate. The converted datastream is then applied to pulse-width-modulation circuitry (21) which generates a PWM signal at the PWM frame rate. Clock circuitry (25) generates clock signals, to the sample rate converter (17), responsive to a sample rate conversion ratio that is associated with the AM tuned frequency. For a given AM tuned frequency, the sample rate conversion ratio is selected so that the PWM frame rate and its lower harmonics avoid the AM tuned frequency, any intermediate frequency in the AM tuner (6), and also an image frequency in the tuner (6). The sample rate converter (17) can also be controlled to upsample digital audio from low sampling frequency sources.

A multi-carrier receiver capable of receiving one or multiple frequency channels simultaneously is described. In one design, the multi-carrier receiver includes a single radio frequency (RF) receive chain, an analog-to-digital converter (ADC), and at least one processor. The RF receive chain processes a received RF signal and provides an analog baseband signal comprising multiple signals on multiple frequency channels. The ADC digitizes the analog baseband signal. The processor(s) digitally processes the samples from the ADC to obtain an input sample stream. This digital processing may include digital filtering, DC offset cancellation, I/Q mismatch compensation, coarse scaling, etc. The processor(s) digitally downconverts the input sample stream for each frequency channel to obtain a downconverted sample stream for that frequency channel. The processor(s) then digitally processes each downconverted sample stream to obtain a corresponding output sample stream. This digital processing may include digital filtering, downsampling, equalization filtering, upsampling, sample rate conversion, fine scaling, etc.

The invention provides a multi-gear code rate adaptive demodulation system and method based on a neural network so as to solve the technical problems of high complexity of realization of an existing multi-gear code rate adaptive demodulation system and large computation amount of a demodulation method. In the demodulation system, an ADC sampling module samples an analog modulation signal; a code element feature point extraction module carries out detection on phase jump points of the sampled signal by utilizing a one-dimensional convolution neural network trained by a neural network construction module; a code rate estimation module estimates code rate of the sampled signal according to the detection result; a signal-to-noise ratio estimation module estimates signal-to-noise ratio of the sampled signal; a controller module selects low-pass filter coefficients and an interpolation structure of a demodulation module according to the code rate estimation result and the signal-to-noise ratio estimation result, and calculates sampling rate conversion ratio of the demodulation module; and finally, the demodulation module carries out demodulation on the sampled signal according to the selected low-pass filter coefficients and the interpolation structure as well as the calculated sampling rate conversion ratio.

A method for generating speech packets and a communication apparatus implementing the method and functioning as a first node of a communication system. A first stream of digital speech samples having a first sample rate is provided (201). If the first sample rate is determined (202) as not matching a required sample rate, said speech packets are generated (204) based on a second stream of digital speech samples generated (203) by performing sample rate conversion of the first stream of digital speech samples.

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 samples in a data stream. Coefficients of a (polyphase) finite impulse response filter are interpolated based on a current time register value. Additional computational efficiency (and a smaller finite impulse response filter) may be used due to oversampling the input signal to the finite impulse response filter.

Disclosed is a sampling rate conversion apparatus for converting first data, sampled at a first sampling rate, into second data, sampled at a second sampling rate, includes a FIFO for storing the first data responsive to a first clock signal and for outputting the first data as second data responsive to the second clock signal. This FIFO stores the first data based on a write control signal indicating whether or not the first data written directly previously is to be updated to the first data, and outputs the second data read out based on a read control signal indicating whether or not the second data as read out is to be read out during the next time interval as well. The sampling rate conversion apparatus also includes a frequency detection unit for measuring the first clock signal during the current time interval to generate the value of the first current clock frequency, generating the value of a current predicted clock frequency from the value of the first current clock frequency and the value of the directly previously predicted clock frequency and for using the value of the current predicted clock frequency as the directly previously predicted clock frequency during the next time interval, and a calculating unit supplied with the first data to output the data to the FIFO. The calculating unit generates write control signal and read control signal from the value of a second current frequency, generated by measuring the second clock signal during the current time interval, and from the value of the current predicted clock frequency, to output the so generated write and read control signal to the FIFO.

A real-time sample rate converter having a non-polynomial convolution kernel provides reduction in die area and power for performing sample rate conversion in real-time. A non-polynomial convolution kernel, which may be a gaussian operator, is used to determine output sample values from values of an incoming stream of values. If the input sample rate is higher than the output sample rate, the input sample stream is convolved with the gaussian kernel and then decimated to yield the output stream. If the input sample rate is lower than the output sample rate, the input stream is resampled to a small multiple of the output sample rate and convolved with the gaussian kernel to produce the output sample stream directly.

The present invention relates to systems and methods that remove echo from a signal via a novel echo cancellation technique that supports arbitrary playback sampling rates. The novel echo cancellation technique transforms a playback signal to a frequency domain representation and converts its sampling rate to a sampling rate of a frequency domain transformed received signal for the appropriate number of frequency bins. This conversion is achieved via an exact or interpolated approached. The re-sampled playback signal transform is then utilized in connection with the received signal transform to remove echo associated with the playback signal from the received signal.

Digital to Analog Conversion and sample conversion blocks are combined in order to reduce hardware and/or computational complexity. A novel DSM design is used to perform sample rate conversion. The DSM may also be used to perform other digital filtering functions, thus providing a single hardware/software technique to perform both functions. The invention includes a method and apparatus for converting input data samples provided at a first sample rate to an analog output signal. Input data samples are converted by a Delta Sigma Modulator (DSM) in a Digital to Analog Converter (DAC) to output data samples, where internal states of the DSM are updated at a second sample rate unequal to the first sample rate. At least one internal state of the DSM s modified to account for the time difference in response to a new input sample arriving at a time different from an update of the internal states of the DSM.