Analog Devices Global

Anthony Evan O'Shaughnessy

Colin Gerard Lyden

Claire Croke

Michael Hennessy

Miguel Usach Merino

Joseph Peter Canning

A device having a sample-rate converter that may be programmed to generate samples at different rates is synchronized to an external synchronization pulse by temporarily changing the sample rate to a temporary sample rate and then changing the sample rate back to the original sample rate. Synchronization in a reduced amount of time is achieved by determining the interval between the synchronization pulse and one of the output samples and determining a processing time of the device for generating the output samples at a new rate. The system calculates a temporary sample rate based on these calculations that tends to reduce an amount of time to achieve synchronization.

Resynchronization of sample rate converters

It is known to perform sample rate conversion. A sample rate converter is arranged to receive digital data at an input sample rate Fand to output data at an output sample rate F, where F=F/N, and N is decimation factor greater than 1. A problem can arise with sample rate converters when a user wishes to change the decimation rate. Generally a sample rate converter needs to discard the samples in its filter when the decimation rate is changed, and the filter output is unusable until the filter has refilled with values taken at the new decimation rate. The sample rate converter provided here does not suffer from this problem. The sample rate converter includes at least Q channels. Each channel comprises a Qth order filter arranged to select input signals at predetermined intervals from a run of P input signals, and to form a weighted sum of the selected input signals to generate an output value, and where the runs of P input signals of one channel are offset from the runs of P signals of the other channels.

Sample rate converter, an analog to digital converter including a sample rate converter and a method of converting a data stream from one data rate to another data rate

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Glounthaune, Ireland

Anthony Evan O'Shaughnessy