Sampling rate converter data flow control mechanism

A mobile communication device comprising a transmission circuit wherein the transmission circuit comprises sampling rate converter adapted to perform a sampling rate conversion of an incoming data stream clocked at a first frequency and an output stream of data clocked at a second frequency;

• the converter comprising:
• an up-sampling circuit adapted to up-sample the incoming data stream;
• a filter adapted to filter the up-sampled incoming data stream;
• an interpolation filter adapted to interpolate the filtered up-sampled incoming data stream data;
• a FIFO adapted to store the interpolated filtered up-sampled incoming data stream (the IFUI data stream), the FIFO being adapted to store the IFUI data stream at the first frequency and being further adapted to enable reading of the IFUI data stream from the FIFO at the second frequency so as to output the stored IFUI data stream at a second corresponding rate;
• a control block comprising a numerically controlled oscillator (NCO) wherein the NCO is adapted to generate the first frequency;
• and wherein control of the NCO is based on information representative of FIFO status, representative of the modulation of the data stream, and representative of a sampling rate ratio of the sampling rate of the incoming data stream and the output data stream.

A process of performing a sampling rate conversion of an incoming data stream clocked at a first frequency and then output as an output data stream at a second frequency;

• the process comprising:
• up-sampling the incoming data stream;
• filtering the up-sampled incoming data stream;
• interpolating the filtered up-sampled incoming data stream;
• storing, into a FIFO, the interpolated filtered up-sampled incoming data stream (IFUI data stream), said storing being performed at the first frequency and the reading of said FIFO being performed at the second frequency so as to output the stored data at a second corresponding rate;
• controlling a numerically controlled oscillator (NCO) used to generate the first frequency based on information representative of a status of said FIFO, a modulation of the incoming data stream, and a ratio of the incoming data stream and the output data stream sampling rate change.