JP2000165267A - Car radio adaptor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a car radio adaptor where a sound of a car audio unit does not give any hindrance onto a speech by a portable telephone set or the like and that is simply set to even an existing car radio unit. SOLUTION: The car radio adaptor is provided with an adaptor body 10 that incorporates a carrier detection circuit 1 capable of detecting a transmitted carrier of a mobile telephone set placed in a cabin and with a sound volume controller 20 that is engaged removably with a sound volume knob of a car audio unit mounted in a car body. Further, the adaptor body 10 includes a control circuit CPU that provides a signal to reduce a sound volume to the sound volume controller 20 when detecting the transmitted carrier.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a car audio system mounted on a vehicle, and more particularly to an adapter for a car audio system.

[0002]

2. Description of the Related Art As is well known, with the recent development of inter-mobile communication, communication between a mobile body such as a running car and a telephone on a general telephone line has been performed relatively frequently. By the way, if the occupant is carrying a call signal while listening to car audio, if the mobile phone or car phone that the occupant is carrying receives the call signal, the sound of the car audio will interfere with the call. It is necessary to lower the volume of the car audio and operate the hook button of the mobile phone to set the reception state.

[0003] However, the order operation at the time of such an incoming call,
It is very troublesome for unfamiliar people, and after starting a call, they often find that the sound of the car audio interferes with the call, and the volume knob of the car audio is located far from the caller's hand. In some cases, it was necessary to ask the passenger to operate the same volume knob. Of course, when the caller is a driver, the operation of the volume knob and the hook button described above is an operation during driving that requires attention, so that these operations are distracted and required for driving the vehicle. There was a danger of neglect.

[0004] At the end of a telephone call with a car or mobile phone, the volume of the car audio is manually returned to the original level and listening is continued. However, this restoration work is also very troublesome. In addition, even in the case of making an outgoing call using a mobile phone or the like from a running vehicle, the same troublesome operation as described above is required.

For this reason, a device for incorporating a band cut filter into a car audio and passing an audio signal of the car audio through the same band cut filter during a call of a car telephone has been proposed in Japanese Patent Laid-Open No. Hei 5-191305. . That is, according to this vehicle acoustic device, during a car phone call, only the sound of the sound range other than the real voice band is loaded on the speaker of the car audio, so that the sound of the car audio is disturbed. And there is an advantage that a call can be made.

[0006]

However, since this vehicle audio system is designed for a vehicle equipped with an automobile telephone, it is ineffective for a telephone call carried by a passenger or the like. At the same time, there are drawbacks that cannot be incorporated into existing car audio and car telephone facilities.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention in view of the current state of the conventional car audio described above to prevent the sound of the car audio from being disturbed during a telephone call with a portable telephone or the like, and to reduce the existing car audio. There is also a car audio adapter that can be easily set.

[0008]

SUMMARY OF THE INVENTION To achieve this object, the present invention provides an adapter body having a built-in carrier detection circuit capable of detecting a carrier wave transmitted from a mobile telephone in a passenger compartment.
A volume controller detachably engaged with a volume knob of a car audio mounted on the vehicle, wherein the adapter main body gives a signal for reducing the volume to the volume controller when the transmitted carrier wave is detected. A car audio adapter incorporating a control circuit is proposed.

In the following description of a preferred embodiment of the present invention, 1) a structure in which the adapter main body includes a manual volume set switch capable of forcibly increasing or decreasing the volume of car audio via the volume controller; A structure will be described in which the control circuit provides a signal for increasing the volume to the volume controller when the transmission carrier is no longer detected.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. As can be understood from FIG. 1, the car audio adapter according to the present invention includes a resin molded adapter body 10 that can be mounted on an instrument panel or a center sole of a vehicle, and is supplied with a power supply voltage from a cigarette lighter socket. A carrier detection circuit 11 and a control circuit CPU, which will be described in detail later with reference to FIG.

A power switch 12 for turning on the power and a volume set switch 13 which can be operated by a fingertip are arranged on the surface of the adapter body 10. Forcibly operating the volume knob of the car audio by manually operating the volume set switch 13. The output code of the adapter body 10 is connected to a volume controller 20 controlled by an output signal of a control circuit CPU (described later).

The volume controller 20 has a geared motor 21 which is rotated forward and backward by an output signal of a control circuit CPU.
A resin clutch member 23 that can be elastically fitted to a volume knob 31 of a car audio 30 is fixed to the deceleration output shaft 22 of the geared motor 21. That is, the illustrated volume controller 20 includes a ferromagnetic fixed cap 24 surrounding the deceleration output shaft 22 of the geared motor 21, and a base flange 24 a of the fixed cap 24 is fixed to the surface of the car audio 30 with a double-sided adhesive tape or the like. Since the clutch member 23 at the center of the fixed cap 24 is elastically fitted to the volume knob 31 of the car audio 30 and the fixed cap 24 is fixed to the magnet ring 25, the geared motor 21 Can be used to rotate the volume knob 31 in any direction.
When the volume knob 31 is rotated by the geared motor 21, if there is a possibility that the volume knob 31 reaches the movable limit and an excessive force may be applied between the geared motor 21 and the volume knob 31, the volume knob may be used. This prevents slippage between the clutch member 31 and the clutch member 23, thereby preventing an excessive force from acting on the volume knob 31.

FIG. 2 shows the signal system of the adapter body 10 described above. Inside the adapter body 10, a carrier detection circuit 11 capable of detecting a carrier wave transmitted from a mobile telephone in a vehicle compartment.
The output signal of the carrier detection circuit 11 is input to a control circuit CPU that controls the volume controller 20 described above. Output signals from a power supply switch 12 for turning on a power supply voltage and a manually operated volume set switch 13 are input to the control circuit CPU, and the geared motor 21 of the volume controller 20 is driven by a calculation result according to a procedure described later. , Volume knob 3 of car audio 30
1 is rotationally controlled.

FIG. 3 shows a control flow of the above-described car audio adapter. When the power is turned on by the power switch 12, first, a mobile telephone (mobile telephone, PHF telephone, car telephone equipment, etc.) in the vehicle compartment is transmitted. Carrier,
That whether originating carrier of 800MHz _Z or 1,500MH _Z is present is checked (step S
₁ ). In other words, the hook button of the mobile phone is operated in the cabin, and the other party is specified by the dial button,
Alternatively, when the mobile phone in the vehicle cabin enters the receiving state after receiving the designation signal, a strong carrier wave is transmitted. Therefore, the presence signal of the transmitted carrier is input from the carrier detection circuit 11 to the control circuit CPU.

For this reason, the control circuit CPU sends an output signal to the volume controller 20 for a fixed time, applies an excitation voltage in the forward direction to the geared motor 21 of the volume controller 20 for a fixed time, and The volume knob 31 is rotated counterclockwise by a certain angle to reduce the sound pressure level output from the speaker of the car audio 30 (step S ₂ ). As a result, even when the car audio system 30 is in use, when the mobile telephone enters a calling state for a call, the car audio system 30 is automatically set.
Since the volume knob 31 is turned down, it is possible to talk in a quiet state with a low sound pressure level.

Further, since the monitoring of the transmitted carrier wave of the mobile telephone is performed even while the mobile telephone is being used, the call is terminated and the hook button of the mobile telephone is pressed, so that the transmission of the transmitted carrier wave is stopped. , at the waiting, then whether the volume setting switch 13 is manually operated is checked (step S _3). Then, when the same volume set switch 13 is not manually operated, the control circuit CPU outputs an output signal to the volume controller 20 again, reverses the geared motor 21 for a certain time, and returns the volume knob 31 clockwise by a certain angle, returning the sound pressure from the speaker of the car audio 30 to the original level (step S _4).

[0017] It should be noted that, during the check of the volume set switch 13 in the previous step S _3, the volume set switch 1
3 is manually operated, an output signal in the forward and reverse rotation direction is output from the control circuit CPU to the volume controller 20 for a time during which the same volume set switch 13 is operated.
Volume control 31 is forcibly turning operation, so that the volume of the car audio 30 is changed to a level to be listened (Step S _5).

Since the car audio adapter of the present invention can be used simply by detachably connecting the volume controller 20 to the position of the volume knob 31 of the car audio 30, it can be set to the existing car audio 30 as necessary. In the illustrated embodiment, the power is supplied from the cigarette lighter socket. However, the power supply of the car audio adapter may be a built-in power supply.

[0019]

As is apparent from the above description, according to the present invention, it is possible to simply set an existing car audio,
A car audio adapter according to the present invention, in which the volume of the car audio can be automatically reduced by automatically reducing the volume of the car audio during a call by the mobile phone, and the volume of the car audio can be automatically restored at the end of the call. It is possible to freely change the volume of the car audio even during use.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a relationship between a car audio adapter and a car audio according to the present invention.

FIG. 2 is a block diagram of the car audio adapter.

FIG. 3 is a control flow of the car audio adapter.

[Explanation of symbols]

 Reference Signs List 10 Adapter body 11 Carrier detection circuit 12 Power switch 13 Volume set switch 20 Volume controller 21 Geared motor 22 Reduction output shaft 23 Clutch member 24 Fixed cap 25 Magnet ring 30 Car audio 31 Volume knob

Claims (3)

[Claims] An adapter body having a carrier detection circuit capable of detecting a carrier wave transmitted from a mobile telephone in a vehicle compartment;
A volume controller removably engaged with a volume knob of a car audio mounted on the vehicle, wherein the adapter body provides a signal for reducing the volume to the volume controller when the transmitted carrier wave is detected. A car audio adapter having a built-in control circuit. 2. The car audio adapter according to claim 1, wherein the adapter main body includes a manual volume set switch capable of forcibly increasing or decreasing the volume of the car audio via the volume controller. 3. The control circuit according to claim 1, wherein the control circuit supplies a signal for increasing the volume to the volume controller when the transmission carrier is no longer detected.
Or the car audio adapter according to claim 2.