Multi-picture tuning scheme of television receiver

• US 4,259,690 A
• Filed: 10/03/1978
• Issued: 03/31/1981
• Est. Priority Date: 10/06/1977
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Nakanishi, Kaoru, Kanchi, Masahiro
• Primary Examiner(s): Martin, John C.
• Application Number:
  US05/948,632
• Time in Patent Office: 910 Days
• Field of Search: 358/182, 358/183, 358/188, 358/191, 358/192, 325/465, 325/396, 334/1, 334/15, 334/14, 455/184-187
• US Class Current: 348/565
• CPC Class Codes: H04N 5/45 Picture in picture , e.g. displaying simultaneously another television channel in a region of the screen

Abstract

A multi-picture tuning scheme suitable for a television receiver of the type which displays at least two kinds of television pictures simultaneously on a same screen tube employed therein includes a series of channel selection switches, a control switch, a storage device responsive to the series of channel selection switches to store two series of channel selection information according to the series of channel selection switches, a selection circuit responsive to the control switch to select the storage of the channel selection information into the storage device so that one of the two series of channel selection information is allocated in the storage device, and a tuning device responsive to the storage device for receiving a channel in accordance with the channel selection information.

Claims

1. A channel selection device for use in a television receiver of the type which provides at least two kinds of television pictures simultaneously on the same screen tube employed therein, the channel selection device comprising:

a channel selection switch assembly for generating channel selection information;

a control switch;

first and second storage means responsive to the channel selection switch assembly, each of said storage means storing channel selection information derived from said channel selection switch assembly;

selection means responsive to said control switch for controlling the application of said channel selection information to one of said first and second storage means; and

first and second tuning means responsive to the first and second storage means respectively for receiving a channel in accordance with the channel selection information.

2. The channel selection device according to claim 1, which further comprises switching means for selectively interchanging the channel selection information from said first storage means to said second tuning means and from said second storage means to said first tuning means.

3. The channel selection device according to claim 2, which further comprises a second control switch for controlling said switching means.

4. The channel selection device according to claims 1 or 2, wherein said selection means comprises a flip-flop.

5. The channel selection device according to claims 1 or 2, which further comprises:

an OR gate responsive to said channel selection switch assembly;

enabling means responsive to said OR gate for allowing said selection means to be brought to a condition where said selection means enables said second storage means to store the channel selection information when said channel selection switch is depressed following the actuation of said control switch.

6. The channel selection device of claims 1 or 2 wherein said first and second tuning means each include a plurality of preset channel tuning voltage generators.

7. The channel selection device according to claim 6, wherein each of said preset channel tuners includes an indication lamp, said indication lamp being energized when its respective preset channel tuner is energized.

8. A channel selection device for use in a television receiver of the type which provides at least two kinds of television pictures from two different television signals simultaneously displayed on the same screen tube employed therein, comprising:

a channel selection switch assembly for generating channel selection information;

first and second tuning means responsive to said channel selection information, each of said tuning means for receiving a selected television signal; and

switching means for selectively interchanging the channel selection information from said channel selector switch assembly to either of said first or second tuning means.

9. The channel selection device of claim 8 further comprising:

first and second storage means responsive to said channel selection information for retaining said channel selection information and constantly supplying said information to said tuning means;

said switching means selectively interchanging the channel selection information presented to said storage means.

10. A channel selection device for use in a receiver capable of tuning in at least two different frequencies simultaneously, comprising:

a single channel selection switch assembly for supplying all of the channel selection frequency information in said device;

first and second memory means for storing said channel selection frequency information;

first and second tuners responsive to said first and second memory means respectively; and

means responsive to said channel selection switch assembly for loading said channel selection frequency information into said first and second memories.