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US 10,686,466 B2Granted
System and methods for data compression and nonuniform quantizers
AssigneeCable Television Laboratories, Inc.
InventorsMu Xu, Zhensheng Jia, Jing Wang, Luis Alberto Campos
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Abstract
A method for differentiator-based compression of digital data includes (a) using a subtraction module, subtracting a predicted signal from a sample of an original signal to obtain an error signal, (b) using a quantization module, quantizing the error signal to obtain a quantized error signal, and (c) generating the predicted signal using a least means square (LMS)-based filtering method.
Claims17
A method for differentiator-based compression of digital data, comprising:
- generating a predicted signal using an adaptive filtering method, wherein generating the predicted signal using the adaptive filtering method comprises multiplying a tap-weight vector by an original data vector to generate the predicted signal, the original data vector comprising N sequential samples of an original signal, N being an integer greater than or equal to one;
- using a subtraction module, subtracting the predicted signal from a sample of the original signal to obtain an error signal;
- using a non-uniform quantizer, quantizing the error signal to obtain a quantized error signal;
- and
- updating the tap-weight vector by adding to the tap-weight vector a product of (a) a step size, (b) the error signal, and (c) a complex conjugate of the original data vector.
2 more elements
A method for receiving a signal, comprising:
- receiving a transmission signal from a transmission medium;
- demodulating the transmission signal to obtain a demodulated signal;
- mapping the demodulated signal from V to U bits to obtain a quantized error signal, U and V each being respective integers, and U being greater than V;
- decompressing the quantized error signal to obtain a quantized original signal by:
- generating a predicted signal using an adaptive filtering method, and
- using an addition module, adding the predicted signal to a quantized error signal to obtain the quantized original signal;
- and
- converting the quantized original signal into an analog output signal.
5 more elements
A method for transmitting data, comprising:
- sampling an analog original signal to obtain a sample of the original signal;
- generating a first predicted signal using a first least means square (LMS)-based filtering method;
- subtracting the first predicted signal from the sample of the original signal to obtain an error signal;
- quantizing the error signal to obtain a quantized error signal;
- mapping the quantized error signal from U bits to V bits to obtain a mapped error signal, U and V each being respective integers, and U being greater than V;
- modulating a carrier signal according to mapped error signal to obtain a transmission signal;
- transmitting the transmission signal from a first location to a second location using a transmission medium;
- demodulating the transmission signal to obtain a demodulated signal;
- mapping the demodulated signal from V to U bits to obtain the quantized error signal;
- generating a second predicted signal using a second LMS-based filtering method;
- using an addition module, adding the second predicted signal to the quantized error signal to obtain a quantized original signal;
- and
- converting the quantized original signal into an analog output signal.
10 more elements
Dependencies are inferred from the claim text.