Device for automatic application of tuning voltage to tunable components of the intermediate frequency amplifier for television receivers

摘要

In known television receivers, an automatic calibration of the tunable components of the IF amplifier is carried out following the production process and the calibration voltages determined during this process are stored in digital form. In normal operation of the receiver, the stored calibration voltages are read out of the memory under control of a control circuit and applied to the tunable components. The novel device is intended to ensure that the calibration voltages are correctly applied even with multi-standard operation. For this purpose, the control circuit is supplied with an identification signal for the standard of the currently received television signal, in normal operation of the receiver. After evaluating the identification signal, the control circuit addresses the memory in such a manner that the calibration voltages corresponding to the received standard are read out. IMAGE