| 摘要 |
<p>The noise in a frequency demodulated audio signal is detected on basis of the characteristics of the stereo-multiplex signal to obtain a very reliable information that can be used for the sliding stereo-mono transition, noise blanking and a de-noising of the stereo-difference signal. A noise signal ( nu d,l(t)- nu d,u(t) or nu d.u(t)- nu d.l(t)) is calculated by subtracting one sideband of the stereo-difference signal from the other sideband of the stereo-difference signal and as a direct measure for the quality of the signal generating the variance ( sigma <2> nu d) of the noise signal by squaring and thereafter averaging the noise signal. <IMAGE></p> |
