Fix in the README

README.md

@@ -116,7 +116,7 @@ The shaped biphase symbol is generated once and for all by a Python program call
 
 Internally, the program samples all signals at 228 kHz, four times the RDS subcarrier's 57 kHz.
 
-The FM multiplex signal (baseband signal) is generated by `fm_mpx.c`. This file handles the upsampling of the input audio file to 228 kHz, and the generation of the multiplex: unmodulated left+right signal (limited to 15 kHz), possibly the stereo pilot at 19 kHz, possibly the left-right signal, amplitude-modulated on 38 kHz (suppressed carrier) and RDS signal from `rds.c`. Upsampling is performed using a zero-order hold followed by an FIR low-pass filter of order 60. I use a sampled sinc windowed by a Hamming window. The filter coefficients are generated at startup so that the filter cuts frequencies above the minimum of:
+The FM multiplex signal (baseband signal) is generated by `fm_mpx.c`. This file handles the upsampling of the input audio file to 228 kHz, and the generation of the multiplex: unmodulated left+right signal (limited to 15 kHz), possibly the stereo pilot at 19 kHz, possibly the left-right signal, amplitude-modulated on 38 kHz (suppressed carrier) and RDS signal from `rds.c`. Upsampling is performed using a zero-order hold followed by an FIR low-pass filter of order 60. The filter is a sampled sinc windowed by a Hamming window. The filter coefficients are generated at startup so that the filter cuts frequencies above the minimum of:
 * the Nyquist frequency of the input audio file (half the sample rate) to avoid aliasing,
 * 15 kHz, the bandpass of the left+right and left-right channels, as per the FM broadcasting standards.