Patent ID: 8208365

Claim:
A Digital Radio Mondiale (DRM) receiver comprising: an analog-to-digital converter (ADC) configured to sample a received composite RF signal at a first sampling rate, the composite RF signal comprising a DRM-encoded signal and a non DRM-encoded signal; a downsampler configured to downsample the received composite signal at a downsampling rate x, where x equals the first sampling rate divided by a positive integer greater than 1; an analog and digital separation filter configured to receive the downsampled composite signal and separate the DRM-encoded signal from the non DRM-encoded signal; a mode identifier coupled to the output of the downsampler and configured to determine a predetermined DRM parameter mode of the received DRM-encoded signal and output a signal indicative of the determined DRM mode; and a demodulator coupled to the downsampler and configured to receive and demodulate the downsampled DRM-encoded signal into a plurality of cells, the demodulator further comprising a programmable N-point Fast Fourier Transform (FFT), where N is an integer number equal to a power of two, and N is determined in response to the signal indicative of the determined DRM mode.