JPS6347081Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement to a channel selection display device for a tuner of a television receiver used in a CATV system in a hotel or the like.

Previously, some TV receivers used in CATV terminals in hotels etc. could only receive broadcasts and general commercial broadcasts, but in recent years hotels etc. Increasingly, multiple independent broadcasting channels are being set up to broadcast hotel information and special movies for a fee. However, in such a situation, the channel selection display device of conventional TV receivers could only display the operated channel selection switch, so it was difficult to select the channel in a dark room. It was difficult to operate the station switch accurately, and if the channel selection switch for a pay television channel was operated by mistake, troubles related to charges would occur, which was very inconvenient.

The present invention was made to solve the inconveniences of conventional channel selection display devices.
A switch row 1 consisting of channel selection switches 11, 11, . . . that can specify and select a desired broadcast channel; A signal train 2 consisting of light-emitting indicators 21, 21, etc. for visually recognizing the broadcast channel relationships specified by an inactive channel discrimination circuit 3 that separately outputs a discrimination signal indicating the presence or absence of broadcasting;
It is connected to the electric circuits of both the switch row 1 leading to the signal row 2 and the idle channel detection circuit 3, and in the waiting state for tuning, the idle channel detection circuit 3 emits light related to the broadcasting channel that has been determined to be broadcasting. All the display devices 21 are made to emit light with the same contrast, and all the light emitting display devices 21 related to the broadcast channel determined to be inactive are made to extinguish. station switch 11,
When any one of 11... is activated and a specific broadcasting channel is selected, only the light-emitting display 21 corresponding to the operated channel selection switch is set to be different from the other light-emitting indicators 21, 21... It is an object of the present invention to provide a light emission visual recognition type channel selection channel display device characterized by including a signal drive circuit 4 that causes light to be emitted in a distinguishable manner based on contrast.

More specifically, regarding the display device of the present invention, the switch row 1 is arranged in a predetermined order on the front surface of a cabinet (not shown). As the channel selection switches 11, 11, . . . constituting the switch row 1, conventionally known push button switches are employed. Light-emitting indicators 21, 21, . . . are symmetrically arranged in the vicinity of the channel selection switches 11, 11, . The light emitting indicators 21, 21, . . . adopted here are usually light emitting diodes, but it goes without saying that well-known pilot lamps may also be used.

The idle channel discrimination circuit 3 can be constructed by combining a well-known tuning circuit 31, a detection circuit 32, an integrating circuit 33, and a comparator 34 as shown in FIG.
A broadcast wave sent through a transmission line is input to a tuning circuit 31, and a carrier wave obtained by tuning is detected by a detection circuit 32 to obtain a DC voltage. By adding it to the circuit 33,
For broadcast channels where broadcast waves are being sent from CATV, the integrating circuit 33 generates a DC voltage and causes the comparator 34 to output a signal of 1; for broadcast channels where broadcast waves are not being sent, the integrating circuit 33 comparator 3 without generating DC current.
4 will be forced to output a 0 signal.

The signal drive circuit 4 is composed of a switch self-holding circuit 41 and a luminance control circuit 42 in the illustrated example of FIG. The switch self-holding circuit 41 includes a read-only memory ROM, a readable and writable memory RAM, a parallel input circuit section I that interfaces with an input signal source, and a data holding circuit section O that holds output data, all in one semiconductor. A 1-chip microcomputer built on a board (manufactured by Mitsubishi Electric Corporation:
"M58840-XXXP" is used, and the read-only memory ROM is programmed with an instruction to output the changed data to the data holding circuit section O when the input data of the parallel input circuit section I changes.

Parallel input circuit section I of switch self-holding circuit 41
are the channel selection switches 11, 1 that constitute the switch row.
1... and the idle channel discrimination circuit 3, and when any of the tuning switches 11 is turned on, the data of this parallel input circuit section I changes so that the data of the tuning switch 11 that was turned on is connected to the central tuning switch 11. It is given to the processing circuit unit CPU. Then, when the idle channel discriminating circuit 3 corresponding to the tuning switch 11 is 1, the processing circuit unit CPU outputs the data of the turned-on tuning switch 11 to the data holding circuit unit O, where it is held. Ru.

The luminance control circuit 42 is provided corresponding to the all-emission display devices 21, 21, . . . of the signal line 2.
It is composed of OR gates 42a, 42a..., a monostable multivibrator 42b, an astable multivibrator 42c, and a counter 42d. Two of the OR gates 42a, 42a...
One of the two input sections is connected to the data holding circuit section I, and the other input section is connected to the monostable multivibrator 42b, and a light emission display is performed by the output of the monostable multivibrator 42b. The vessels 21, 21... emit light at the same time. On the other hand, monostable multivibrator 42
b is linked to an astable multivibrator 42c via a counter 42d. The pulses oscillated by the astable multivibrator 42c are frequency-divided by a counter 42d and triggered at regular intervals to output pulses with a constant cycle, such as a monostable multi-output, as shown in FIG.
Therefore, when the entire circuit is in the energized state in FIG. 2, that is, in the tuning waiting state, for each trigger pulse obtained by dividing the pulse of the astable multivibrator 42c by the counter 42d, The monostable multivibrator 42a gives output pulses to the OR gates 42a, 42a..., and the light emitting indicators 21, 21 of the signal train 2
...blinks over a certain period of time. When the light emitting indicators 21, 21... flicker quickly (30 times or more per second) until the flickering disappears due to the afterimage phenomenon of the naked eye, the illuminance is averaged to a low level and the light emitting state becomes somewhat dim. It is visible. If a specific channel selection switch 21 is turned on in such a state, this fact is confirmed by the central processing circuit CPU of the switch self-holding circuit 31, and the CPU
The data corresponding to the channel selection switch 21 that is turned on is outputted to the data holding circuit section O, and as shown in FIG.
Only the APL is in a continuous power supply state, and the lines corresponding to the other light emitting indicators 21, 21... are still blinking and energized, so the light emitting indicators 21 connected to the line APL and the other light emitting indicators 21, 21... A contrast in brightness appears between the light emitting indicators 21, 21..., and the light emitting indicators 2 connected to the lines BPL and DPL where the idle channel discrimination circuit 3 is 0.
1, 21... are in the extinction state.

Although the display device of the present invention is generally constructed as described above, the present invention is by no means limited to the above-mentioned embodiments, and various modifications can be made within the scope of the "claims for registration of a utility model." For example, as for a mechanism for selectively discriminating only a specific light-emitting display among the light-emitting displays 21, 21, . Of course, we also plan to create one. That is, in FIG. 5,
The light-emitting display 21 is constantly supplied with current and is in a light-emitting state when the transistor Tr ₂ is in the ON state via the resistor R ₁ , that is, when the pause channel ₃ outputs a signal of 1 to the base side of Tr 2. However,
In this state, when an additional current is applied from the switch self-holding circuit 41 to the base side of the transistor Tr ₁ of the luminous control circuit 42 and also applied to Tr ₂ , the transistor Tr ₁ becomes conductive, so that the resistance R ₂ The input current to the light emitting display 21 increases through the light emitting display 21, and the illuminance level increases.
When the output of the inactive channel discrimination circuit 3 is 0, the transistor Tr ₂ becomes non-conductive and the light emitting display 21 is turned off.

As explained above, in the present invention, the light-emitting display corresponding to the non-tuning switch is turned off during non-broadcasting, and illuminates in the tuning standby state during broadcasting, so it can be installed in a dark room. Even in such a case, it is easy to recognize the position of each channel selection switch, and there are no inconveniences such as accidentally selecting a channel, and many other advantages can be obtained in practical terms.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an outline of the present invention, Fig. 2 is a mechanical wiring diagram showing an embodiment of the display device of the invention, Fig. 3 is a block diagram of a suspension channel discriminating circuit, and Fig. 4 is a block diagram showing an embodiment of the display device of the present invention. FIG. 2 is a time chart of the light emitting display corresponding to FIG. 2, and FIG. 5 is a circuit diagram showing another embodiment of the contrast generating mechanism in the light emitting display of the present invention. 1...Switch row, 11...Tuition selection switch, 2
. . . Signal string, 21 . . . Light emitting indicator, 3 .

Claims (1)

[Scope of utility model registration request] A switch row 1 consisting of channel selection switches 11, 11, . . . that can specify and select a desired broadcast channel; Light emitting indicators 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21...
a signal train 2 consisting of a signal train 2; and an inactive channel discriminating circuit 3 that selects between broadcasting channels that are currently broadcasting and broadcasting channels that are inactive, and separately outputs the presence or absence of broadcasting for each broadcasting channel as a discriminating signal.
and; connected to the electrical circuits of both the switch train 1 leading to the signal train 2 and the idle channel detection circuit 3, and in the waiting state for tuning, is related to the broadcasting channel determined by the idle channel detection circuit 3 to be broadcasting. All the light-emitting indicators 21 related to the broadcast channel determined to be inactive are made to emit light with the same contrast, and all the light-emitting indicators 21 related to the broadcasting channel determined to be inactive are extinguished, while corresponding to the indicators 21, 21, . . . which are emitting light with the same contrast. Channel selection switch 1
1, 11... is operated to select a specific broadcast channel, only the light emitting display 21 corresponding to the operated channel selection switch is set apart from the other light emitting indicators 21, 21... A light emitting visual recognition type channel selection channel display device comprising a signal drive circuit 4 that emits light in a distinguishable manner with different contrasts.