Method and apparatus for tuning channels for catv and television applications

摘要

A method of tuning channels for television and community antenna television (CATV) devices includes the step of receiving a radio frequency input (RFI) signal having at least one carrier signal at frequency fs associated with a selected broadcast channel. The RFI signal is up-converted by m to a first intermediate frequency wherein the carrier signal is located at fs+m. The first intermediate frequency is filtered. The filtered first intermediate frequency is down-converted by n to a second intermediate frequency wherein the second intermediate frequency includes the carrier signal at fs+m-n. Additional methods for improving the reception of the selected channel include the step of varying m and n in order to avoid frequency-dependent anomalies within the pass band of the filter. For digital communications, m and n are varied in accordance with an error rate of the digital communications in order to reduce the error rate of the digital communications.