Altera Corporation

Lawrence Rigby

Benjamin J Esposito

Suleyman Sirri Demirsoy

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.

Sample rate conversion by controlled selection of filter outputs

A quantizer can be used to adjust the number of bits representing each sample value in a signal. Then, each received sample is allocated to one of a number of bins, with each bin corresponding to one of the possible quantizer output values. The quantizer can be used for providing a digital signal with a required number of bits, and the quantization interval can be adjusted. The quantization is performed in multiple stages. In a first stage, a received signal is compared with a first threshold value. In subsequent stages, the received signal is compared with respective threshold values, with the threshold value for each stage being calculated on the basis of the comparison result of the previous stage, and on the basis of an adjustable quantization interval. The quantized value is formed from the one-bit results from the comparison operations.

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Lawrence Rigby