KR910000555Y1 - Multi-lateral auto converting circuit - Google Patents

Abstract

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Description

Voice multiple switching circuit

1 is a circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

1: Mode control unit 2: Switching voltage generating unit

3: voice signal control unit 4: mode switching unit

D ₁ -D ₃ : Diodes Q ₁ -Q ₈ : Transistors

R _1- R ₁₄ : Resistor F _1, F ₂ : Filter

The present invention relates to a voice multiple switching circuit applicable to color television, videotape recorders, and audio equipment.

In voice multiple broadcasting, in order to listen to Korean, foreign language or Korean and foreign language at the same time, each mode is set to listen to the corresponding broadcast. However, in the conventional voice multiple switching circuit, when a broadcast is received, a foreign language signal and a Korean signal are received. At the same time, it is input to the voice multiple mode switching IC so that foreign languages are mixed with each other when listening to Korean, and Koreans are mixed with each other.

In view of the above problems, the present invention completely separates these input signals so that a foreign language signal is not used when listening to Korean and a Korean signal is not input when listening to a foreign language. In order to be able to devise, it will be described in detail based on the accompanying drawings.

The present invention is a diode (D ₁ -D ₃ ) connected to the mode control unit 1, the mode terminals (P _1- P ₃ ), as shown in FIG. Switching voltage generation section 2 consisting of resistors R ₁ -R ₈ , transistors Q ₁ -Q ₄ , switches SW ₁ (SW ₂ ), resistors R ₉ -R ₁₄ , transistors Q ₅ -Q ₈ ), consisting of a voice signal control unit 3 and a mode switching unit 4, in the drawing, reference numeral F ₁ is a filter for filtering mono or Korean signals, F ₂ is a filter for filtering foreign language signals It is a filter, P _S indicates a foreign language signal input terminal, Pm indicates a mono or Korean signal input terminal, and P _V indicates a voltage input terminal.

Prior to explaining the operation of the present invention configured as described above will be defined the state of the mode control unit (1).

TABLE 1

First, in the case of mono broadcasting, when a user presses a mono broadcasting key using a key matrix in a remote control transmitter (not shown), the corresponding signal is input to the input terminal IN of the voice multiple mode control unit 1. At this time, the voice multiple mode control unit 1 recognizes and outputs the output terminals P ₁ , P ₂ , and P ₃ in a low state ″ L ″ as shown in Table 1.

At this time, and the transistor (Q1-Q ₂₎ are all off and the transistor (Q ₄₎ is turned on by a resistor (R _4, R ₅₎ a voltage (+ Vcc) via a. Therefore, the OV is applied to the control terminal P _{V by the} mode switching unit 4. In this case, since there is no voltage applied to the bias resistors R ₄ and R ₅ regardless of the state of the switches SW ₁ and SW ₂ configured inside the voice signal control unit 3, the transistors Q ₅ -Q ₈ . Are all off, so that only the Korean signal is applied to the input terminal Pm at the time of mono broadcasting to the mode switching unit 4 and then output through the output terminal OUT.

On the other hand, in the voice dual broadcasting, in the case of foreign language broadcasting, when the user operates the key metrics of the remote control transmitter, the high signal is output from the output terminal P ₁ of the mode control unit 1 as shown in Table 1 above. The terminals P ₂ and P ₃ output low signals. At this time, a high bias voltage is applied to the base of the transistor Q ₁ via the diode D ₁ and the resistor R ₁ so that the transistor Q ₁ is turned on and the transistors Q ₂ and Q ₃ are turned on. Since the bias voltage is not applied to the base, the transistors Q ₂ and Q ₃ are turned off. Since the transistor Q ₄ is also turned off as the transistor Q ₁ is turned on, a resistor R ₆ is applied to the control terminal Pv of the mode switching unit 4 with a transverse voltage (for example, + 12V).

At this time, switch SW ₁ of voice signal control unit 3 to contact point a. When the switch SW ₂ is positioned at each of the contacts d, the transistor Q ₅ is turned on because the +12 V generated by the switching voltage generator 2 is applied to the bias resistor R ₉ . The transistor Q ₇ is also turned on by the voltage via R ₁₃ ). On the other hand, in this case, since the switch SW ₂ is located at the contact point d, the transistors Q ₆ and Q ₈ remain in the off state. As the transistor Q ₇ is turned on and the transistor Q ₈ is turned off, the Korean language signal in the voice multiple broadcast is filtered by the filter F ₂ , and the foreign language signal filtered by the transistor Q ₈ is turned off as the transistor Q ₈ is turned off. It is inputted to the input terminal Ps of (4) and then supplied to an output amplifier not shown through its output terminal OUT.

Also, in case of Korean broadcasting during voice multiple broadcasting. As shown in Table 1, only the terminal P ₂ of the mode control unit 1 goes high and the remaining terminals P ₁ and P _{3 go} low, in this case, the high state output from the terminal P ₂ . The signal of turns on the transistor Q ₂ via the resistor R ₂ and at the same time turns on the transistor Q ₁ through the diode D ₂ and the resistor R ₁ . As transistor Q ₁ is turned on, transistor Q ₄ is turned off as described above. In addition, since the low signal is output from the output terminal P ₃ of the mode controller 1, the transistor Q ₃ also maintains a turn-off state. As the transistors Q ₁ and Q ₂ are turned on and the transistors Q ₃ and Q ₄ are turned off, the voltage division by the resistors R ₆ and R ₇ is applied to the control terminal Pv of the mode switching unit 4. A voltage x Vcc (e.g., + 4V) is applied. At this time, if the switch SW ₁ of the audio signal control unit 3 is placed at the contact point b and the switch SW ₂ is placed at the contact point c, the transistors Q ₅ and Q ₆ are turned off while the transistor Q ₆ , Q ₈ ) is turned on. Therefore, the Korean language signal is input to the input terminal Pm of the mode switching unit 4 through the filter F ₁ , and the foreign language signal is grounded through the collector-emitter by the transistor Q ₈ so that the mode switching unit ( Since it is not applied to the input terminal Ps of 4), only the Korean voice signal is output from the output terminal OUT of the mode switching unit 4.

Finally, when simultaneously listening to Korean broadcasts and foreign language broadcasts, the signal in the high state is output only from the output terminal P ₃ of the mode control unit 1, as shown in Table 1, and the mode terminals P ₁ and P. ₂ ), the low signal is output.

In this case, similar to Korean broadcasting, the transistor Q ₁ is turned on by the signal via the diode D ₃ and the transistor Q ₃ is turned on in accordance with the bias voltage caused by the resistor R ₃ . However, it can be seen that transistors Q ₄ and Q ₂ remain in the off state. Accordingly, since the transistor Q ₂ .Q ₄ is turned off, the control terminal Pv of the mode switching unit 4 has a divided voltage due to the resistors R ₆ and R ₈ . X Vcc) (e.g., 8 V) is applied. At this time, if the switches SW ₁ and SW ₂ configured in the voice signal control unit 3 are positioned at the contacts b and d, respectively, the transistors Q _{5 to} Q ₈ are all turned off. Korean signals and foreign language signals are input to the input terminals Pm and Ps, respectively, and are then output to the outside through their output terminals OUT.

The present invention operating as described above has a feature of selectively separating and outputting desired Korean, foreign or Korean + foreign language signals by appropriately adjusting the state of the mode controller and the switch of the voice signal controller.

Claims (1)

In a color television audio multiple switching circuit having a mode switching unit (4) for selectively outputting audio signals required for mono broadcasting and audio multiple broadcasting by a key signal input from a remote control transmitter, the key signals are received. The voice multiple mode control unit 1 for generating a signal for controlling the mono broadcast and voice multiple broadcast modes, and when the control signal is in the first state, generates a first voltage necessary for mono broadcast, and generates the control signal. In the second state, a third voltage for listening to a foreign language during voice multiple broadcasting is generated, and when the control signal is in the fourth state, a fourth voltage for simultaneously listening to Korean and a foreign language is generated. A switching voltage generator 2 for supplying to the switch 4 and: inputting second to fourth voltages output from the switching voltage generator 2 during voice multiple broadcasting, When the first switch is turned on, a foreign language signal is selected, when the second switch is turned on, a Korean signal is selected, and when the first and second switches are turned on, a voice signal controller for generating a control signal for listening to both Korean and foreign languages simultaneously A voice multiple switching circuit, characterized by consisting of (3).