M-derived filter (original) (raw)
m-derived filters or m-type filters are a type of electronic filter designed using the image method. They were invented by Otto Zobel in the early 1920s. This filter type was originally intended for use with telephone multiplexing and was an improvement on the existing constant k type filter. The main problem being addressed was the need to achieve a better match of the filter into the terminating impedances. In general, all filters designed by the image method fail to give an exact match, but the m-type filter is a big improvement with suitable choice of the parameter m. The m-type filter section has a further advantage in that there is a rapid transition from the cut-off frequency of the passband to a pole of attenuation just inside the stopband. Despite these advantages, there is a draw
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| dbo:abstract | m-derived filters or m-type filters are a type of electronic filter designed using the image method. They were invented by Otto Zobel in the early 1920s. This filter type was originally intended for use with telephone multiplexing and was an improvement on the existing constant k type filter. The main problem being addressed was the need to achieve a better match of the filter into the terminating impedances. In general, all filters designed by the image method fail to give an exact match, but the m-type filter is a big improvement with suitable choice of the parameter m. The m-type filter section has a further advantage in that there is a rapid transition from the cut-off frequency of the passband to a pole of attenuation just inside the stopband. Despite these advantages, there is a drawback with m-type filters; at frequencies past the pole of attenuation, the response starts to rise again, and m-types have poor stopband rejection. For this reason, filters designed using m-type sections are often designed as composite filters with a mixture of k-type and m-type sections and different values of m at different points to get the optimum performance from both types. (en) I filtri m-derivati o filtri di tipo m sono un tipo di filtri elettronici progettati utilizzando il metodo delle impedenze immagine. Essi sono stati ideati da Otto Zobel nei primi anni 1920. Questo tipo di filtri, in origine, era destinato per l'uso con la multiplazione telefonica ed era un miglioramento dell'esistente filtro di tipo a costante k. Il problema principale da affrontare era la necessità di ottenere un migliore adattamento del filtro nelle impedenze di terminazione. In generale, tutti i filtri progettato con il metodo delle impedenze immagine non riescono a dare un adattamento esatto, ma il filtro di tipo m, con un'opportuna scelta del parametro m, rappresenta un grande miglioramento. La sezione del filtro di tipo m ha un ulteriore vantaggio in quanto c'è una transizione rapida dalla frequenza di taglio della banda passante a un polo di attenuazione appena dentro la banda da eliminare. Nonostante questi vantaggi, c'è un inconveniente con i filtri di tipo m; alle frequenze oltre il polo di attenuazione, la risposta riprende a crescere e i filtri di tipo m ha una scarsa reiezione della banda da eliminare. Per questa ragione, i filtri progettati utilizzando sezioni di tipo m sono spesso progettati come filtri composti con una miscela di sezioni di tipo k e di tipo m e valori diversi di m in punti diversi per ottenere le prestazioni ottimali da entrambi i tipi. (it) |
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| rdfs:comment | m-derived filters or m-type filters are a type of electronic filter designed using the image method. They were invented by Otto Zobel in the early 1920s. This filter type was originally intended for use with telephone multiplexing and was an improvement on the existing constant k type filter. The main problem being addressed was the need to achieve a better match of the filter into the terminating impedances. In general, all filters designed by the image method fail to give an exact match, but the m-type filter is a big improvement with suitable choice of the parameter m. The m-type filter section has a further advantage in that there is a rapid transition from the cut-off frequency of the passband to a pole of attenuation just inside the stopband. Despite these advantages, there is a draw (en) I filtri m-derivati o filtri di tipo m sono un tipo di filtri elettronici progettati utilizzando il metodo delle impedenze immagine. Essi sono stati ideati da Otto Zobel nei primi anni 1920. Questo tipo di filtri, in origine, era destinato per l'uso con la multiplazione telefonica ed era un miglioramento dell'esistente filtro di tipo a costante k. Il problema principale da affrontare era la necessità di ottenere un migliore adattamento del filtro nelle impedenze di terminazione. In generale, tutti i filtri progettato con il metodo delle impedenze immagine non riescono a dare un adattamento esatto, ma il filtro di tipo m, con un'opportuna scelta del parametro m, rappresenta un grande miglioramento. La sezione del filtro di tipo m ha un ulteriore vantaggio in quanto c'è una transizione rapid (it) |
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