KR910001588Y1 - Mode display circuit for multi-audio television - Google Patents

Abstract

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Description

Broadcasting Mode Display Circuit of Voice Multiple TV

The accompanying drawings are circuit diagrams of the present invention.

* Explanation of symbols for main parts of the drawings

3a, 3b, 3c, 3d: Switching unit C ₁ -C ₅ : Capacitor

R ₁ -R ₁₂ : Resistor D ₁ -D ₅ : Diode

ZD: Zener Diode Q ₁ -Q ₆ : Transistor

The present invention relates to a broadcast mode display circuit of a voice multiple TV, and more particularly, to a broadcast mode display circuit for displaying the broadcast mode actually received regardless of the operation of the mode selection switch.

In conventional multi-television TVs, LED lamps corresponding to the mode of the selected switch are turned on by selecting each mode selector regardless of whether the stereo or duplex lamps are turned on according to the broadcast conditions received. As a result, users sometimes misunderstood the mode of the broadcast being received.

The purpose of the present invention is to solve such a problem, and only when the mode switch corresponding to the actual broadcast mode is selected among the mode selection switches, the corresponding mode display LED is turned on. When it is selected to the mode for displaying the LED for the mode is not to be turned on to accurately display the current broadcast status, the configuration and operation of the present invention will be described in detail by the accompanying drawings.

Dual and stereo lamps (E ₁ ) (E ₂ ), mono (MONO) mode selector switch (SW ₁ ), dual mode selector switch (SW ₂ ) for sub or SUB broadcasting (SW ₃ ), in the broadcast mode display circuit of voice multiple TVs consisting of a stereo mode selection switch (SW ₄ ) and each mode display LED (E ₃ -E ₆ ), the dual signal is a condenser (C ₃ ) (C ₄ ). ), Respectively, are applied to the dual mode selection switch SW ₂ (SW ₃ ) through the third switching unit 3c including the resistors R ₄ (R ₅ ) and the transistors Q ₄ (Q ₅ ). The stereo signal is configured to be applied to the stereo mode selection switch SW ₄ through the fourth switching unit 3d including the capacitor C ₅ , the resistor R ₆ , and the transistor Q6. , The dual and stereo signals are also condenser (C ₁ ) (C ₂ ). While being applied to the dual and stereo lamps E ₁ (E ₂ ), respectively, via the first switching unit 3a consisting of resistors R ₁ (R ₂ ) and transistors Q ₁ (Q ₂ ), It is applied to the mono mode selector switch SW1 through the second switching part 3b made of a diode D ₁ (D ₂ ), a resistor R ₃ , a transistor Q ₃ , and a zener diode ZD. In the description, B ⁺ is a DC power supply, 1 is a dual preferred input terminal, 2 is a stereo signal input terminal, and R ₇ -R ₁₂ are resistors.

First, during mono broadcast input, the base of the transistor Q _{3 in} the second switching unit 3b is brought to the 'low' level by the resistor R ₂ and the B ⁺ voltage 12V applied to the emitter is Zener. This transistor Q ₃ is 'turned on' because it is higher than the zener voltage 5V of the diode ZD. Therefore, B ⁺ power is applied to the mono mode selection switch (SW ₁ ), and when the switch (SW ₁ ) is 'on', the LED (E ₄ ) is turned on to indicate that the current is in the mono broadcasting mode.

On the other hand, since no dual or stereo signal is input to each terminal 1, 2, the transistors Q ₁ , Q ₂ , Q ₄ -Q _{6 in} each switching unit 3a, 3c, 3d are all and "off", and this dual stereo lamp (E ₁₎ (E ₂₎ is to be turned off while all the switches (SW ₂ -SW ₄₎ roneun B ⁺ since the power is not applied to the switches (SW ₂ -SW ₄ by ) LED (E ₄ -E ₆₎ pressing is not lit.

Here, the diode (D ₁ ) (D ₂ ) is to prevent the reverse current, the zener diode (ZD) is to not turn on the mono mode display LED (E ₃ ) when B ⁺ power is not applied.

In stereo broadcasting input, the stereo signal (approximately 5V) input to the terminal 2 is connected to the base of the transistor Q ₂ through the differential circuit of the capacitor 2 and the resistor R ₂ in the first switching unit 3a. Is turned on to turn on the transistor Q ₂ to turn on the stereo lamp E ₂ to indicate that the broadcast being received is stereo, while the capacitor C ₅ and resistor in the fourth switch section 3d Since the transistor Q ₆ is 'turned on' by the stereo signal applied to the base of the transistor Q ₆ through the differential circuit of (R ₆ ), when the switch SW ₄ is turned on, the LED (E ₆ ) lights up to indicate the current stereo broadcasting mode.

On the other hand, since the transistor Q _{3 in} the second switching unit 3b is always in a 'turn-on' state, when the user wants to listen to the stereo broadcast in mono, the switch SW ₁ may be turned on to switch to the mono broadcast mode. However, since each transistor Q ₄ (Q ₅ ) in the third switching unit 3c is in an 'off' state, the LED (E ₄ ) (even when the dual mode selection switch SW ₂ (SW ₃ ) is turned on. E ₅ ) does not light up.

Finally, during the dual broadcast input, the dual lamp E ₁ is turned on by the dual signal input to the terminal 1 to indicate that the dual broadcast is received, and the transistor Q _{4 in} the third switching unit 3c. (Q ₅ ) is all turned 'on' so that pressing Swipe (SW ₂ ) selects SUB broadcasting and pressing switch (SW ₃ ) selects MAIN + SUB broadcasting respectively. .

In this case, the switch SW ₁ may also be turned on to switch to the mono broadcast mode state. However, since the transistor Q _{6 in} the fourth switching unit 3d is turned off, the stereo mode selection switch SW ₄ is turned off. it does not work.

As described above, the present invention has only the mode selection switch corresponding to the currently received broadcast mode, and the corresponding LED for the mode display is turned on so that the user can recognize the broadcast state at the time even when watching TV. There is an advantage that can prevent the misunderstanding of the mode state and increase the reliability of the product.

Claims (1)

Dual and stereo lamps (E ₁ ) (E ₂ ), mono mode select switch (SW ₁ ), dual mode select switch (SW ₂ ) (SW ₃ ) for sub or station + sub station, stereo mode select switch (SW ₄₎ In the broadcasting mode display circuit of a voice multiple TV with each mode display LED (E ₃ -E ₆ ), dual signals are condenser (C ₃ ) (C ₄ ), resistor (R ₄ ) (R ₅ ) and The third mode switching unit 3c including the transistors Q ₄ and Q ₅ is configured to be applied to the dual mode selection switch SW ₂ and SW ₃ , respectively, and a stereo signal is condenser C ₅ . . And configured to be applied to the stereo mode selection switch SW ₄ via the fourth switching unit 3d composed of the resistor R ₆ and the transistor Q ₆ , wherein the dual and stereo signals are also condensed C. ₁ ) The diode D is applied to the dual and stereo lamps E ₁ and E ₂ , respectively, via the first switch part 3a including (C ₂ ) and transistors Q ₁ and Q ₂ . ₁ ) (D ₂ ), resistance (R ₃ ). A broadcast mode display circuit for an audio multiple television, characterized in that it is configured to be applied to the above mono mode selection switch SW ₁ via a second switching section 3b comprising a transistor Q ₃ and a zener diode ZD. .