| 摘要 |
<p>The present invention refers to an improved voltage synthesis tuning system with digital memory, in particular for a television transmissions receiver, wherein a plurality of digital codes, each respectively identifying a television channel, are memorised in a digital tuning memory, to a corresponding plurality of addresses, with an automatic tuning circuit, and with means for modifying the respective digital code, in the presence of frequency drift phenomenons, exceeding the pull-in range of such automatic tuning circuit; the main characteristic of the invention consists in that the system searches the television station modifying the digital tuning code and simultaneously verifying the presence of a station identification signal; and that the exact tuning is obtained verifying a high slope signal coming from the automatic tuning circuit. <IMAGE></p> |
