JPS6031392B2 - Tuning device for multi-screen TV receivers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a system for viewing programs of different broadcast channels on the same television receiver by arranging a plurality of screens, that is, a plurality of picture tubes. The present invention relates to a channel selection device for a screen television receiver.

Conventionally, when a multi-screen television receiver has a plurality of channels, for example, two or more picture tubes, the tuning section and the output section have two or more systems corresponding to the number of picture tubes, and each tuning section has two or more channels corresponding to the number of picture tubes. Each had an associated tuning section, and each had an individual memory section in which tuning data was preset.

In such a case, when exchanging an image of one picture tube with an image of another picture tube, it is necessary to exchange the signals after the detection stage, which has the drawback of requiring a complicated configuration. Another drawback is that it requires as many memory sections as there are picture tubes to preset channel selection data.

The present invention was developed for the purpose of solving the above-mentioned drawbacks. First, an embodiment will be explained schematically based on FIG. 1. In the figure, 1 is an antenna for receiving television broadcast waves; , 3 are electronic tuners connected to the rear stages of the antennas, 4 and 5 are video intermediate frequency amplification and video detection amplification parts connected to the rear stages of each tuner 2 and 3, and 6 and 7 are respective electronic tuners. These are picture tubes connected to the rear stages of the intensifiers 4 and 5, respectively. Reference numeral 11 denotes a memory, in which channel selection data for channels to be displayed on the picture tubes 6 and 7, respectively, is preset.

12 is a control processing unit such as a microprocessor connected to the memory 11; 13 is a tuning operation unit such as a keyboard connected to the front stage of this control processing unit;
For example, it includes a diode matrix, etc., and is used to issue a channel selection command to the picture tube 6, a channel selection command to the picture tube 7, and a command to change the channel selection between the picture tubes 6 and 7. used.

Reference numerals 14 and 15 indicate latches connected to the subsequent stage of the control processing section 12, and these latches temporarily hold the channel selection data dA and dB signals from the control processing section 12, respectively.

Reference numerals 16 and 17 indicate selected channel number display sections connected to the latter stages of the latches 14 and 15, respectively.The display section 16 displays the channel number of the picture tube 6, and the display section 17 displays the channel number of the picture tube 7. Display each.

Reference numerals 18 and 19 designate tuning sections of the phase-locked loop PLL connected to the rear stages of the latches 14 and 15, respectively, and these tuning sections apply the tuning voltages sVA and SVB to the tuners 2 and 3, respectively.
Output to.

FIG. 2 is a block wiring diagram showing the control processing section 12 and its surroundings in FIG. This is an empty register connected to 121 for exchanging data, and consists of an accumulator, etc.

Reference numerals 123 and 124 are registers for designated channels, and these registers are connected between the control unit 121 and the memory 11, and the registers 23 and 124 are connected to the latches 14 and 15, respectively.

Reference numeral 125 denotes a register for channel selection data connected to the subsequent stage of the memory 11, and the channel selection section 18 is connected to the subsequent stage of this register.
, 19 are connected.

In the present invention having the above-described configuration, first, when a desired reception channel is received on the picture tube 6, the key group (not shown) of the channel selection operation section 13 is operated to specify the desired channel, and then the control section 121, for example, the register 123
The designated channel signal is held in the designated channel signal, and the tuning data corresponding to the designated channel in the memory 11 is read out, and this tuning data is stored in a predetermined location of the register 125. The data is sent to the channel selection section 18, and as a result, the designated channel broadcast is received by the picture tube 6.

Similarly, the picture tube 7 can also receive an image of a desired reception channel.

In this case, the channel signal specified by the operation of the channel selection operation section 13 is held in the register 124 via the control section 121, and the channel selection data read out from the memory 11 by this specified channel signal. is register 12
5 will be stored in a predetermined location. In addition, latch 1
4 holds the designated channel signal of the register 123, displays this designated channel number on the display section 16, and releases the latch 15.
The designated channel signal of the register 124 is held, and this designated channel number is displayed on the display section 17. When switching the receiving channel of the picture tube 6 and the receiving channel of the picture tube 7, when the key group (not shown) of the tuning operation section 13 is operated, a switching signal is sent from the tuning operation section 13 to the control section 1.
21, the designated channel signal in the register 123 is first passed through the control unit 121, and then sent to the empty register 122.
The designated channel signal in the register 124 is then stored in the vacant register 12 via the control unit 121.
3, and the specified channel signal in the register 122 is stored in the vacant register 1 via the control unit 121.
24, and as a result, register 1
The respective designated channel signals in 23 and 124 will be exchanged.

In this way, the receiving channels of the picture tubes 6 and 7 are also exchanged via the memory 11 and the register 125. The present invention as described above has a memory 1 for presetting image receiving channels regardless of the number of picture tubes 6 and 7.
is sufficient for one machine, therefore, the channel presetting of the memory 11 at the time of manufacturing only needs to be performed for one machine, which has the advantage that the number of manufacturing steps can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic block wiring diagram showing an embodiment of the present invention, and FIG. 2 is a block wiring diagram showing main parts of the same embodiment. 6, 7: Picture tube, 11: Memory, 18, 19: Tuning section,
122, 123, 124, 125: Register. Figure 1 Figure 2

Claims (1)

[Claims] 1. By installing multiple picture tubes in one television receiver,
In a multi-screen television receiver in which each of these picture tubes receives different broadcast channels, a group of channel data for channel selection corresponding to each of the receivable broadcast channels is
It consists of one memory set in advance and a number equal to the number of picture tubes, and holds a signal for specifying each of the broadcast channels to be received by each picture tube. , a group of channel designation registers for sending out the channel data for tuning corresponding to a designated broadcast channel, and the channel selection data sent out from the memory by these channel designation registers. maintains a group of channel data for
When replacing the channel data register that selects and sends these channel data to each broadcast channel selection section provided in each picture tube system, and each picture receiving channel of each picture tube, first, the predetermined A channel designation signal, which is the content of the first channel designation register, is stored, and a channel designation signal, which is the content of a predetermined second channel designation register, is stored in the first channel designation register. and an exchange register for moving the stored first channel designation signal to the second channel designation register after moving the designation signal. Tuning device for multi-screen TV receivers.