Television signal receiver with a universal output for surface-acoustic wave filters of different types

Abstract

The invention relates to a television signal receiver comprising a radio-frequency tuner () and at least one subsequent surface-acoustic wave filter (), in which the radio-frequency tuner () filters a RF television signal applied to its input and converts it to an intermediate-frequency television signal which is coupled to the surface-acoustic wave filter (). The RF tuner () has at least one output stage () which supplies the IF television signal converted to the intermediate frequency. The output stage () is directly connected to an output () of the RF tuner (), while a switch () is associated with it, by means of which switch the IF television signal is supplied to a second output (). A further switch () is associated with the second output (), by means of which switch the associated output () is switchable to a fixed reference potential. The RF tuner () precedes at least one surface-acoustic wave filter (), in which each time a first input () of the surface-acoustic wave filter () is coupled to a first output () of the RF tuner (), and a second input () of the surface-acoustic wave filter () is coupled to the second output () of the RF tuner () via the first switch (), and, for switching the filter characteristic of the television signal receiver, alternately the second input () of the surface-acoustic wave filter () can be coupled to the same IF television signal by means of the associated switch ().