| 摘要 |
In a process for recognising a channel to which a video signal receiver (1, 10), which can be freely adjusted to several channels, is set, the selectable channels are set in succession by a reference tuner (20) and the corresponding video signals are found using a demodulator (21). At least one reference signal component is extracted from each video signal. A line or image frame synchronisation signal or its phase and possibly its frequency is eminently suitable as a reference signal component. A measuring signal component is tapped, e.g. by means of inductive sensors (34, 35) or extracted from a composite signal output (17 to 12). According to the invention, all selectable reference signal components are temporarily stored in a memory (23) and renewed cyclically and repetitively. In order to identify the corresponding channel, the measuring signal components are compared with all temporarily stored reference signal components. The comparison is made using a correlator (31). The image signals are correlated in the event of the correspondence between the measuring signal component and several reference signal components. Because of the temporary storage and continuous updating, the process can be very rapidly and flexibly used. |
