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Autoprogramming tuner apparatus
| Details |
Inventors: Mengel, William H.;
Assignee: General Electric Company (Fairfield, CT)
Primary Examiner: Griffin; Robert L.
Assistant Examiner: Kuntz; Curtis
Attorney, Agent or Firm: Whitacre; E. M., Emanuel; P. M., Lenihan; T. F.
A system for automatically programming an inexpensive volatile memory in an RF tuner with data relating to receivable active channels, upon activation of the receiver by a user after a power failure. Since the system is responsive to the application of standby power after a power failure, an automatic autoprogramming sequence does not occur each time the receiver is turned on by a user. |
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DETAILED DESCRIPTION OF THE DRAWING Referring to the sole FIGURE, a user operable tuner control keyboard 100 is coupled via a four wire bus 110 to a tuner 300.
Tuner 300 is responsive to key commands entered by the user via keyboard 100 to tune selected channels.
Keyboard 100 may include, for example, keys which when operated generate the codes representative of the numerals 0-9, and the functions volume up, volume down, channel up, channel down, and ON/OFF.
Tuner 300 is also coupled to a programming keyboard 200 having ADD 202, ERASE 204 and autoprogramming (AUTO) 210 keys for programming channel selection data into a memory 340 included within tuner 300.
Tuner 300 communicates over and is powered via a multiwire bus 310 coupled between tuner 300 and a chassis 400.
Chassis 400 derives video and audio signals from an IF signal produced by tuner 300 for ultimate display of the video signals on a picture tube (not shown), and ultimate application of the audio signals to a speaker (not shown) Tuner 300 also includes an autoprogramming control circuit 320 which controls tuner 300 to scan the full range of memory and stores active channel data in an inexpensive volatile memory 340.
Programming control keyboard 200 is coupled to tuner 300 via wires W.
sub.
1, W.
sub.
2, W.
sub.
3, W.
sub.
4, W.
sub.
5, and W.
sub.
6, and, as stated above, includes an autoprogramming key (AUTO) 210 which when operated by a user signals tuner 300 to begin an autoprogramming channel scanning operation.
Specifically, when AUTO key 210 is pressed a short circuit is caused to appear between wires W.
sub.
5 and W.
sub.
6 signalling tuner 300 that the user desires that the autoprogram function be activated.
Wires W.
sub.
1 -W.
sub.
4 convey encoded data from ADD key 202, and ERASE key 204, included within programming keyboard 200, to tuner 300.
In order for the remote control circuitry (not shown) and the ON/OFF key of keyboard 100 to function, they must be powered by a standby power supply V.
sub.
SB 420 (located on chassis 400) during the period when the receiver is turned off and the source of operating power V
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