RECEIVER FOR ANALOG AND DIGITAL TELEVISION SIGNALS

摘要

A receiver (100) requiring only a single IF SAW filter (120) and IF amplifier (126) receives signals in both analog format and in digital format, such as the NTSC, PAL and SECAM analog television signal formats and the ATSC and DVB digital television signal formats. IF signals from the IF amplifier (126) are sub-sampled to digital signal form (130) and are processed by respective analog format (140) and digital format (150) processors. Control circuitry (160) responsive to the presence of certain unique components of the signals in analog format and digital format determine which of the analog format and digital format processors is producing valid data and selects the valid data to be utilized. In a television receiver (100), the unique components of the signals may include carrier signals, synchronization signals, pilot signals and symbol timing, and valid data is applied to a television display.