KR930006893Y1 - Radio monitor circuit of car audio machine with built-in microcomputer - Google Patents

Abstract

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Description

Radio monitor circuit of car audio machine with built-in microcomputer

1 is a circuit diagram of the present invention.

2 is a mutual connection diagram of the present invention.

* Explanation of symbols for the main parts of the drawings.

10: microcomputer 15: display

SW1: first switch SW2: second switch

Q1 to Q4: Transistors D1 to D4: Diodes

20: mute circuit unit 25: lute control unit

B +: Power supply 30: Audio selector

40: AM / FM selector 45: radio control

60: APC circuit section 65: APC control section

R1 to R10: resistance

The present invention relates to a radio monitor circuit of a car audio machine with a built-in microcomputer.If you press a music selection button and then press the FF / REW button while listening to music on the tape, the music on the tape is muted, and the music on the tape is listened to FF / When the REW button is pressed, the tape monitor is muted and the radio monitor circuit is selected instead.

In general, audio devices display a variety of functions by embedding a microcomputer, and nowadays, most of the tape intermission detection functions (hereinafter referred to as APCs) are modified. On the other hand, if the tape is attached to the deck mechanism and the FF / REW button is activated, most audio outputs are muted and the output cannot be heard. For this purpose, a separate radio selection button must be turned on to hear the radio output when the FF / REW button is activated. Therefore, there is an inconvenience that must be given to press a separate radio selection button.

The present invention compensates for this. When the FF / REW button is operated, the radio signal is automatically output without a separate button operation. However, when the APC circuit part is activated, the radio signal is not output and only the muting operation is automatically selected.

That is, the microcomputer detects the tape signal and the radio signal according to the switching operation of the third transistor and controls the AM / FM selection unit and the APC circuit unit, the first switch which is grounded when the FF / REW button is pressed, and the tape is mounted. Mute control unit including a second transistor and a mute circuit that is switched in conjunction with the first switch when the tape contact (TB) of the second switch (SW2) is turned on when the tape contact (TB) is turned on, and the power supply is the second switch A fourth transistor connected via a nomarion radio contact, a resistor, and a second diode, the output terminal of which is connected to the base of the third transistor, and a radio controller for driving an AM / FW selector through a diode at the microcomputer output; The microcomputer output is biased as a signal for driving the APC control unit and the APC control unit driving the APC circuit unit through a diode and a resistor. Connected to a second transistor output terminal connected to the mute control unit via a term, and the collector output is provided to a first transistor for providing a bias to the fourth transistor via a first diode, and to a fixed terminal of the second switch, and It is composed of a DC power supply for supplying power to the audio selection unit via a medium, and a third diode connected to block the DC power applied to the APC control unit.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Tape and tape by mutual selection of the microcomputer 10, display 15, mute circuit unit 20, AM / FM selector 40, audio selector 30, APC circuit 60, APC button 61 In the circuit of the car audio machine that can select the muting and radio music, the tape signal and the radio signal are sensed according to the switching operation of the transistor Q3, and the AM / FM selector 40 and the APC circuit unit 60 are detected. At the tape contact TB of the microcomputer 10 to control, the first switch SW1 grounded by pressing the FF / REW button, and the second switch SW2 on which the tape contact TB is turned on when the tape is mounted. The mute control unit 25 including the transistor Q2 and the mute circuit unit 20 switched in conjunction with the first switch SW1, and the power source B + are connected to the nomarion radio contact RB of the second switch SW2. Is biased through resistors R4 and R9 and diode D2, and the output terminal is connected to resistor Q3 via resistor R8. The transistor Q4 connected to the base, the radio control unit 45 whose output of the microcomputer 10 drives the AM / FM selection unit 40 through the diode D4, and the signal passing through the diode D4 are resistors. The APC control unit 65 driving the APC circuit unit 60 through R7 and R6, a signal through the resistor R7 is provided via a resistor R10, and the collector output terminal is connected to the mute control unit 25. The resistor R3 is connected to the transistor Q1 and the fixed terminal of the second switch SW2 which are simultaneously provided in parallel to the anode terminal of the diode D1 forming the common cathode terminal and the diode D2. A total unwinder B + for providing a bias to the transistor Q3 through R5 and R8 and for supplying power to the audio selector 30 that selects an audio output through a resistor R5, and a power source. A diode D3 for blocking (B +) from being applied to the APC controller 65 through the resistor R5.

The mute control unit 25 is turned on by a first switch SW1 having one side grounded, a first switch SW1, and a second switch SW2. The transistor Q2 is turned off, a resistor R1 (R2) for providing a bias to the transistor Q2, and a mute circuit portion 20 connected to the output terminal of the transistor Q2. A resistor R3 connected to the transistor Q1 collector is connected to an output terminal of the transistor Q2. The audio selector 30 automatically configures the tape output signal to the radio output signal when the first switch SW1 is turned on and the contact TB of the second switch SW2 is turned on.

The first switch SW1 is a micro switch mounted on a deck (not shown) and is turned on when the FF / REW button is pressed. The second switch SW2 is a micro switch mounted on the deck, and when the tape is mounted on the deck, the second switch SW2 is connected to the contact TB to configure the mute circuit unit 20 to be selectively operated. The audio selector 30 selectively outputs a type signal when a high level is input and a radio signal when a low level is input. The microcomputer 10 outputs a high level to the output terminal A when the APC button 61 is turned on, and the display 15 when the transistor Q3 of the input terminals B and C of the microcomputer 10 is turned on. Display radio mode and output high level to output A. The AM / FM selector 40 selects AM at low level, and FM at high level. The operation of the configuration will be described with reference to the first diagram of FIG. 2 as follows.

When the tape is mounted on the deck, the contact TB of the second switch SW2 is turned on to provide the power supply B + to the resistor R1, thereby providing a bias to the transistor Q2 by the resistor R1. Since the transistor Q2 is turned on, the mute circuit unit 20 is provided with a low level so that the mute circuit unit 20 is inoperative. That is, as the transistor Q2 is turned on, no bias is provided to the muting transistors Q20 and Q21 shown in FIG. 2 of the muting circuit unit 20, and thus the muting circuit unit 20 does not operate. Meanwhile, since the power supply B + is applied to the base of the transistor Q3 through the resistors R5 and R8, the PNP transistor Q3 is turned off. Accordingly, the microcomputer 10 senses that the tape mode is in the display 15. Indicates that you are in tape mode. At the same time, since the power supply B + is provided to the audio selector 30 in a high level state through the resistor R5, the tape signal becomes an audio output by the selection action of the audio selector 30.

In this state, when the APC button 61 is turned on, the microcomputer 10 senses this and outputs a high level to the output terminal A to operate the APC circuit unit 60 through the resistors R6 and R7. Turn on 65) to stand by. That is, as shown in FIG. 2, when the APC circuit unit 60 is turned on, the intermission signal is detected, and when the desired music order is reached, the transistor Q60 is driven and the solenoid SL is driven accordingly to operate normally at the selected tape position. The output of the microcomputer 10 is 5V or less, but the diode D3 is provided with 5V or more by the power supply B + as shown in FIG. 1, so that the diode D3 is turned off and the transistor Q3 is turned on. It can be kept as it is, and the selected tape output signal becomes audio output.

In this state (during selection), when the first switch SW1, which is turned on when the FF / REW button is pressed, the transistor Q2 is turned off because the base is grounded, so that the output terminal of the collector is connected via the resistor R2. The mute circuit section 20 is turned on at a high level by the power supply B +. At this time, since the APC button 61 is already turned on and the output terminal A of the microcomputer 10 is high, the collector of the transistor Q1 is at the low level, but the collector of the transistor Q2 is at the high level through the resistor R3. The mute of the tape signal is maintained by holding.

On the other hand, while the tape is playing, the contact TB of the second switch SW2 is turned on to cut off the function of the mute controller 25. However, when the FF / REW button is pressed, the first switch SW1 is turned on, and the first switch SW1 is turned on. As the switch SW1 is turned on, the transistor Q2 is turned off and accordingly a high level is applied to the mute circuit unit 20 to operate the mute circuit unit 20. That is, as shown in FIG. 2, the transistor Q2 of the mute control unit 25 is turned on to drive the mute circuit unit 20 so that the audio signal of the tape is muted. At this time, the microcomputer 10 outputs the low level in the tape mode, and accordingly, the transistor Q1 is turned off. Therefore, the high level provided to the collector of transistor Q2 causes transistor Q4 to turn on through resistor R3, diode D1, and resistor R9, thereby applying a low level to the base of transistor Q3. Since the microcomputer 10 is turned on, the display 15 switches to the radio mode and appears.

At the same time, the low level by the collector of transistor Q4 is applied to the audio selector 30 at the low level to select the radio signal as the audio output. That is, when the tape is loaded and the audio output of the tape is heard and the first switch SW1 is turned on (pressing the FF / REW switch).

You will automatically switch from tape mode to radio mode to hear the audio output of the radio. Although the audio output of the radio has been described based on AM, in the case of FM, the microcomputer 10 outputs a high level so as to distinguish the AM from the AM, and the AM / FM selector 40 illustrated in FIG. Choose. That is, the transistors Q40 and Q41 are sequentially turned on through the high level diode D4, and accordingly, the power source B + is applied to the B + power supply terminal of the FM unit to drive the FM unit. However, in the case of AM, since the output terminal A of the microcomputer 10 is at the low level, the transistors Q40 and Q41 are turned off. Instead, the transistor Q42 is turned on to drive the AM unit. In this case, the transistor Q1 may be turned on by the high level, but the microcomputer 10 is connected to the collector of the transistor Q4 which is already turned on and grounded through the resistor R7 and the diode D3 of the APC controller 65. A high level by is applied and grounded. That is, since the high level applied to the transistor Q1 is turned off to the low level by the grounded transistor Q4, the door transistor Q1 is turned off so that the radio mode of the FM is maintained.

In this case, the high level output from the microcomputer 10 to select FM is greater than the voltage by the power supply B + provided to the cathode of the diode D3, thereby enabling the diode D3 to be turned on. That is, the high level for selecting FM is set higher than the high level for turning on the APC circuit unit 60. This means that the difference is made at a high level such that the diode D3 is turned off or on.

As described above, the present invention listens to the audio output of the tape when performing only the tape or the APC function. When the APC function is performed on the tape and the FF / REW button is pressed at the same time, the radio monitor function is muted and the tape is FF / REW. By pressing the button only, you can automatically listen to the audio output by the radio, so that you do not need to press the radio switch when you press the FF / REW button to listen to the radio. When the APC button and the FF / REW button are pressed together, the audio output is muted to prevent confusion of the output audio.

Claims (2)

The tape and the tape may be selected by the mutual selection of the microcomputer 10, the display 15, the mute circuit unit 20, the AM / FM selector 40, the audio selector 30, the APC circuit unit 60, and the APC button 61. In the circuit of the car audio machine that can select the muting and radio music, the tape signal and the radio signal are sensed according to the switching operation of the transistor Q3, and the AM / FM selector 40 and the APC circuit unit 60 are detected. On the tape contact TB of the microcomputer 10 to control, the first switch SW1 grounded by pressing the FF / REW button, and the second switch SW2 on which the tape contact TB is turned on when the tape is attached. The mute control unit 25 including the transistor Q2 and the mute circuit unit 20 switched in conjunction with the first switch SW1 and the power source B + are connected to the nomarion radio of the second switch SW2 ( Bias is provided through RB, resistors R4 and R9, and diode D2, with an output terminal via a resistor R8 of the bay of transistor Q3. The transistor Q4 connected to the switch, the radio control unit 45 for driving the AM / FM selector 40 through the output of the microcomputer 10 through the diode D4, and the signal passing through the diode D4 are the resistors R7. APC circuit section 65 for driving the APC circuit section 60 through R6 and a signal through the resistor R7 are biased through the resistor R10, and the collector output terminal is connected to the yute control section 25. The resistor R3, the diode D2 and the common cathode terminal are provided to the transistor Q1 and the fixed terminal of the second switch SW2 which are simultaneously provided in parallel to the anode terminal of the diode D1 and the resistor ( A power supply B + and a power supply B + which provide a bias to the transistor Q3 through R5 and R8 and respectively supply power to the audio selector 30 which selects the audio output through the resistor R5. It is applied to the APC controller 65 through the resistor R5 connected to block the application to the APC controller 65 through the resistor R5. Ever connected diodes (D3) as characterized by a built-in microcomputer of the car audio equipment of the radio monitor circuit configured block. According to claim 1, wherein the mute control unit 25 is the first switch (SW1) grounded on one side, the transistor (Q2) is turned on, off by the first switch (SW1) and the second switch (SW2), A radio monitor circuit with a built-in microcomputer, comprising a resistor (R1) (R2) for providing a bias to a transistor (Q2) and a mute circuit portion (20) connected to an output terminal of the transistor (Q2).