Telephone and Signal Line Filters

This paper will discuss the uses and design consideration of telephone line filters and signal line filters. Differentiation will be made between "telephone line filters", which serve telephones and other audio equipment, and "signal line filters" where the signals may be pulse trains or digital data feeding computers. The frequency response requirements of this type of filter and the measurements necessary to check response will be discussed. Such design consideration will be discussed as: allowable pass band ripple, group delay, voltage and current ratings, and attenuation in the stop bands as it relates to the number of components.