Method and apparatus for reduction of fm interference for fm...

H - Electricity – 04 – B

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H04B 1/00 (2006.01) H04B 1/10 (2006.01) H04B 1/16 (2006.01) H04J 11/00 (2006.01) H04H 1/00 (2006.01) H04H 1/10 (2006.01)

Patent

CA 2348283

This invention provides a method for reducing FM interference in an in-band on-channel digital audio broadcasting system. The method includes the steps of receiving a composite signal including a signal of interest and an interfering signal and normalizing the composite signal to produce a normalized composite signal. The composite signal is then multiplied by the complex conjugate of the normalized composite signal to produce a real signal. Then the real signal is filtered and the resulting filtered signal is multiplied by the normalized composite signal to produce an output signal. The adverse effects of the interfering signal in the output signal are reduced with respect to the magnitude of the signal of interest reducing FM interference in an in-band on-channel digital audio broadcasting system, thereby making it easier to detect the signal of interest. The output signal and the composite can be blended in response to the power of the real and filtered signals. Radio receivers that utilize the above method are also included.

L'invention concerne un procédé de réduction des interférences en modulation de fréquence dans un système de radiodiffusion numérique intrabande sur le canal de réception. Le procédé consiste à recevoir un signal composite incluant un signal d'intérêt et un signal brouilleur, puis à normaliser le signal composite pour produire un signal composite normalisé. Le signal composite est ensuite multiplié par le conjugué complexe du signal composite normalisé pour produire un signal réel. Le signal réel est filtré et le signal réel filtré résultant est multiplié par le signal composite normalisé pour produire un signal de sortie. Les effets indésirables du signal brouilleur dans le signal de sortie sont réduits par rapport à l'ampleur du signal d'intérêt réduisant les interférences en modulation de fréquence dans un système de radiodiffusion numérique intrabande sur le canal de réception, ce qui permet de détecter plus facilement le signal d'intérêt. Le signal de sortie et le signal composite peuvent être mélangés en fonction de la puissance des signaux réel et filtré. L'invention concerne en outre des récepteurs radio mettant en oeuvre ledit procédé.

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