JPH0212420B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an audio device equipped with a radio receiver and a magnetic tape playback device.

BACKGROUND TECHNOLOGY Conventionally, LMU (Long wave,
Middle wave, Frequency modulation) band
Radio receivers with VF (traffic information broadcasting) used three interlocking switches to change the broadcast frequency band. Since such an interlock switch has a low degree of freedom in device design, the operation surface of the radio receiver is limited and operation is time-consuming.

Purpose The purpose of the present invention is to solve the above-mentioned technical problem,
It is an object of the present invention to provide an audio device equipped with an operation switch that can simplify operation and increase the degree of freedom in device design.

Composition of the Invention The present invention is an audio device including a radio receiver having at least first and second receiving sections provided according to the frequency band of a broadcast signal, and a magnetic tape playback device, which comprises: a power source; a cassette power switch circuit that connects the magnetic tape playback device to the power source by inserting a cassette tape into the magnetic tape playback device and outputs a first control signal indicating an operating mode of the playback device; a manual radio power switch circuit that outputs a second control signal indicating an operating mode of the radio receiver; a radio power supply circuit provided between the power source and the radio receiver; and the radio power supply circuit. a selector switch that selectively supplies the output of the radio power supply circuit to the first receiving section or the second receiving section; a specific broadcast reception switch circuit that supplies the first control signal to a first reception unit, cuts off the first control signal, and outputs a third control signal indicating a reception mode of the specific broadcast; When the first control signal is not detected by detecting the second control signal, the radio power supply circuit is controlled in response to the detection of the second control signal to connect the power supply and the radio receiver. selectively connecting the third
The audio equipment is characterized by comprising a control means for setting a reception state of a specific broadcast in response to detection of a control signal.

Embodiment FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention. Power from the power supply 61 is applied to the amplifier circuit 66, the microcomputer 58, the display 70, and the mode switching circuit M. The mode switching circuit M includes an amplitude modulation (AM) broadcast reception section 63, a frequency modulation (FM) broadcast reception section 64, an FM
This circuit switches the power from the power source 61 to the traffic information broadcast means included in the broadcast receiving section 64 and to the cassette tape recorder section 65, respectively. The traffic information broadcast receiving means 68 also controls the output of the cassette. The audio signal from any one of the AM broadcast receiving section 63, FM broadcast receiving section 64, traffic information broadcast receiving means 68, and cassette tape recorder section 65 powered by the mode switching circuit M is transmitted to the amplifier circuit 66. The signal is amplified by the speaker 67 and audible by the speaker 67. The microcomputer 58 operates in response to information specifying power energization by the mode switching circuit M, and displays the information on the display unit 70.

FIG. 2 is an electrical circuit diagram of one embodiment of the present invention. The positive terminal of the power supply 61 is connected to the common contact 16c of the switch 16 and the relay switch 1 via the switch 62.
The contact 1a of the relay coil 2 is connected to one terminal of the relay coil 2 and the cathode of the diode 3. The other terminal of the relay coil 2 is connected to the anode of the diode 3. Contact 1a of relay switch 1
is connected to the cathode of the Zener diode 13 via the resistor 12. The anode of the Zener diode 13 is grounded. The cathode of the Zener diode 13 is connected to the positive electrode of a capacitor 15 via a resistor 14. The negative electrode of capacitor 15 is grounded. The positive terminal of capacitor 15 is connected to line l1. Line l1 is connected to the base of transistor 29 via resistor 25 and resistor 28. Also, line l1 is connected to resistor 26 and resistor 2.
7 to the base of the transistor 30.

Contact point 1b of relay switch 1 is connected to capacitor 4
is grounded via a resistor 8 and a Zener diode 9. Contact 1b of relay switch 1 is connected to the collector of transistor 11. The base of the transistor 11 is grounded via the cathode of the Zener diode 9 and the capacitor 10. The emitter of transistor 11 is grounded via resistor 41 and capacitor 57, and connected to the emitter of transistor 40. A resistor 31 is connected between the emitter and base of the transistor 33. transistor 33
The base of transistor 37 is connected via resistor 34 to
connected to the collector of The emitter of transistor 33 is connected to the base of transistor 37 via resistor 35 and resistor 36. A resistor 38 is connected between the emitter and base of the transistor 37. The emitter of transistor 37 is grounded. A connection point between the resistor 35 and the resistor 36 is connected to the anode of the diode 44. The cathode of the diode 44 is the cathode of the diode 43,
It is connected to the contact 45b of the switch 45, the cathode of the diode 46, the cathode of the diode 51, and the cathode of the diode 23. The collector of the transistor 33 is connected to the common contact 3 of the switch 39.
Connected to 9c. The AM broadcast receiving section 63 is connected to the contact 39a of the switch 39. A contact 39b of the switch 39 is connected to the FM broadcast receiving section 64 and the base of the transistor 49 via a resistor 47. The base of transistor 49 is grounded via resistor 48 . The emitter of transistor 49 is grounded, and its collector is connected via resistor 50 to line l1. Further, the collector of the transistor 49 is connected to the anode of the diode 51,
and the base of a transistor 56 via a resistor 55, respectively.

In the microcomputer 58, the terminal 58
The emitter of the transistor 29 is at a, the collector of the transistor 29 is at the terminal 58b, the emitter of the transistor 30 is at the terminal 58c, the collector of the transistor 30 is at the terminal 58d, one end of the resistor 7 is at the terminal 58e, the emitter of the transistor 56 is at the terminal 58f,
The collector of the transistor 56 is connected to the terminal 58g, the emitter of the transistor 54 is connected to the terminal 58h, and the terminal 58
The collector of the transistor 54 is connected to each terminal i.

The base of transistor 40 is connected to the anode of diode 43 via resistor 42. A contact 45a of the switch 45 is grounded. The base of transistor 54 is connected to line l1 via resistors 53 and 52. Further, the base of the transistor 54 is connected to the anode of the diode 46 via the resistor 53. The base of transistor 60 is connected to the anode of diode 17 via resistors 24 and 21. Further, the anode of the diode 17 is connected to the cassette tape recorder section 65 and the terminal 16b of the switch 16.

The operation of the circuit shown in FIG. 2 will be explained below. First, the microcomputer 58 will be explained. When terminal 58c and terminal 58d are off, switch 1
Once it is detected that the terminal 58e is turned on, a high level signal p1 is sent from the terminal 58e, and the radio power transmitted through the line 13 is turned on. When the on operation of the switch 18 is detected again, the microcomputer 58 performs an operation to turn off the radio power. When the signal p1 is high level, the terminals 58c and 58d
When the terminal 58c and the terminal 58d are turned on, the signal p1 becomes low level, and when the terminal 58c and the terminal 58d are turned off again, the signal P1 returns to the original high level. terminal 58
When the terminal 58d and terminal 58d are on, the switch 18 is turned on.
The terminal 58e is at a low level regardless of whether it is off or not. Further, when the terminals 58d and 58c are off, the cassette mode is canceled. Terminal 58f and terminal 58g
is on, and the receiving frequency band is FM broadcasting.
Terminal 58f and terminal 58g are off, and the receiving frequency band is AM broadcasting. Terminal 58h and terminal 58i
is on, the traffic information broadcast mode is activated. terminal 5
8h and terminal 58i are turned off, and the traffic information broadcast mode is canceled.

Here, the operation of the circuit including the mode switching circuit M will be explained. When the switch 62 is turned on, the power supply 61
power is applied to line l2. When a cassette tape is removed from the cassette tape recorder section 65, the common contact 16c of the switch 16 is switched to the contact 16a, and when the switch 18 is turned on, the transistors 59 and 29 are turned on. As a result, the terminals 58a and 58b of the microcomputer 58 are turned on, and at this time, the signal p from the terminal 58e of the microcomputer 58 is turned on.
1 becomes high level, and the signal p1 makes the transistor 5 conductive. As a result, the relay coil 2 is energized and the relay switch 1 is turned on. The power of the power supply 61 is therefore supplied to line l3 of the radio power supply. As a result, transistor 11 and transistor 33 are turned on, and a high level voltage is applied to common contact 39c of switch 39.

When the common contact 39c of the switch 39 is switched to the contact 39b, the FM broadcast receiving section 64 is activated.
Further, transistor 49 and transistor 56 are turned on. Terminal 58 of microcomputer 58
f and the terminal 58g are turned on by turning on the transistor 56. As a result, the microcomputer 58 causes the display 70 to display information for listening to FM broadcasting, and also causes the FM mode to be set.

On the other hand, connect the common contact 39c of the switch 39 to the contact 3
When switched to 9a, the AM broadcast receiving section 63 is operated. At this time, the transistor 56 is turned off as the transistor 49 is turned off, and the terminals 58f and 58g of the microcomputer 58 are turned off. As a result, the microcomputer 58
operates to receive AM broadcasting, and the display 70
Information for listening to AM broadcasting is displayed on the display 70.

Next, when switch 45 is turned on, transistor 40 is turned on and transistor 33 and transistor 37 are turned off. The switching operation of switch 39 is not accepted by turning on switch 45. Further, when the switch 45 is turned on, the transistor 54 is turned on, and the terminals 58h and 58i of the microcomputer 58 are turned on. As a result, the microcomputer 58 performs operations for receiving the traffic information broadcast. The microcomputer 58 also causes the display 70 to display information for listening to traffic information. Next, when a cassette tape is inserted into the cassette tape recorder section 65, the common contact 16c of the switch 16 switches to the contact 16b, and the power supply 61 is connected to the cassette tape recorder section 65.
power is supplied to the cassette tape recorder section 6.
5 works. Also, transistor 60 and transistor 30 are turned on, and microcomputer 5
The terminals 58c and 58d of the microcomputer 58 are turned on, and the microcomputer 58 performs operations for the cassette tape recorder section 65. The microcomputer 58 also causes the display 70 to display information for operating the cassette tape recorder section 65. The microcomputer 58 changes the signal p1 from the terminal 58e to a low level by turning on the terminal 58c and the terminal 58d. As a result, the mode switching circuit M enters the listening state of the cassette tape recorder section 65.

When the mode switching circuit M is in the listening state of the cassette tape recorder section 65 and the switch 45 is turned on to listen to the traffic information broadcast, the transistor 60 and the transistor 30 are turned on.
is turned off. As a result, the terminals 58c and 58d of the microcomputer 58 are turned off.
The microcomputer 58 brings the signal p1 from the terminal 58e to the level before the cassette tape recorder listening condition. When signal p1 becomes high level,
Also, by turning on the switch 45, the transistor 5
4 is turned on, and terminal 5 of the microcomputer 58
Since 8h and 58i are turned on, the microcomputer 58 gives an indication on the display 70 that the traffic information broadcast is being received, and enters the traffic information mode.

The high level signal p1 from the terminal 58e of the microcomputer 58 causes the transistor 5 to
is turned on, and relay switch 1 is turned on. As a result, transistors 11, 40, 49, and 56 are turned on, and the traffic information broadcast reception state is established. When switch 18 is turned on in this state, transistors 59 and 29 are turned on, and microcomputer 5
The terminals 58a and 58b of the microcomputer 58 are turned on, and the microcomputer 58 sends out a low level signal p1 from the terminal 58e, so that the cassette is played back.
Next, when the switch 18 is turned on again, the microcomputer 58 sends out a high level signal p1 from the terminal 58e. Therefore, even if the cassette tape is removed from the cassette tape recorder section 65 next time, the mode will not change.

Next, the operation when a cassette tape is set in the cassette tape recorder section 65 will be explained. Common contact 16c of switch 16 switches to contact 16b, turning on transistor 60 and transistor 30. This causes the microcomputer 58 to put the cassette tape recorder section 65 into operation. When switch 45 is turned on in this state, transistor 60 and transistor 30 are turned off, and terminals 58c and 58d of microcomputer 58 are turned off. Further, when the switch 45 is turned on, the transistor 54 is turned on, and the terminal 58h of the microcomputer 58 is turned on.
and terminal 58i are turned on. At this point, the cassette tape recorder section 65 performs a reproduction operation.

Next, when switch 18 is turned on, transistors 59 and 29 are turned on, and microcomputer 5
The terminals 58a and 58b of the microcomputer 58 are turned on, and the microcomputer 58 sends out a high-level signal p1 from the terminal 58e. This signal turns on transistor 5, and an exciting current flows through relay coil 2. This turns on relay switch 1 and turns on transistors 11 and 40.
At this point, the vehicle is in the traffic information broadcast reception state. When the switch 45 is turned off, the transistor 54 is turned off, and the terminals 58h and 58i of the microcomputer 58 are turned off. Also, when switch 45 is turned off, transistors 60 and 3
0 is turned on, and the microcomputer 58 makes the cassette tape recorder section 65 ready for operation.

Through the above operations, the AM broadcast receiving section 6
3, the FM broadcast receiving section 64, and the cassette tape recorder section 65 can be switched.

In this embodiment, the power supplies of the AM broadcast receiving section 63, the FM broadcast receiving section 64, the cassette tape recorder section 65, and the traffic information broadcast receiving means 68 are switched, but the receiving sections of other frequency bands are also switched. It's okay.

Effects As described above, according to the present invention, by providing a mode switching circuit that switches the power supply of each receiving section, it is possible to simplify the operation and increase the degree of freedom in device design. Further, the number of switches on the operating surface of the audio equipment can be reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention, and FIG. 2 is an electric circuit diagram including a mode switching circuit M of the embodiment of the present invention. 61... Power supply, 63... Amplitude modulation broadcast receiving section, 64
...Frequency modulation broadcast receiving section, 65...Cassette tape recorder section, M...Mode switching circuit.

Claims (1)

[Claims] 1. An audio device comprising: a radio receiver having at least first and second receiving sections provided according to the frequency band of a broadcast signal; and a magnetic tape playback device, comprising: a power source; a cassette power switch circuit that connects the magnetic tape playback device to the power source by inserting a cassette tape into the magnetic tape playback device and outputs a first control signal indicating an operating mode of the playback device; a manual radio power switch circuit that outputs a second control signal indicating an operating mode of the radio receiver; a radio power supply circuit provided between the power source and the radio receiver; and the radio power supply circuit. a selector switch that selectively supplies the output of the radio power supply circuit to the first receiving section or the second receiving section; a specific broadcast reception switch circuit that supplies the first control signal to a first reception unit, cuts off the first control signal, and outputs a third control signal indicating a reception mode of the specific broadcast; When the first control signal is not detected by detecting the second control signal, the radio power supply circuit is controlled in response to the detection of the second control signal to connect the power supply and the radio receiver. selectively connecting the third
1. An audio device comprising: control means for setting a reception state of a specific broadcast in response to detection of a control signal.