JPH03224190A - Acoustic device for automobile - Google Patents

Abstract

PURPOSE:To automatically receive the broadcasting of a roadside zone by providing a tuner dedicated to receiving the broadcasting of the roadeside zone and switching it to the reception of the broadcasting of the roadside zone with the aid of the control of a control microcomputer when the receiving level thereof becomes equal to or exceeds a prescribed level. CONSTITUTION:A switch 5a executes the switching of connection between the outputs of an AM/FM stereo tuner 2, a cassette tape player 3 and a CD player 4 and an power amplifier 7 at a first stage and executes the switching of the connection between the outputs of the tuner 2 and the tuner 9 dedicated to receiving the broadcasting of the roadside zone and the amplifier 7 at a second stage. Such switching is executed by the control of the microcomputer for controlling 6a. By the switching with the aid of a operation key at the first stage, the tuner 2 is connected to the amplifier 7. Then, since the receiving level of the dedicated tuner 9 becomes equal to or exceeds the prescribed level when an automobile enters the broadcasting area of the roadside zone, the switching on the second stage is executed. Thus, the broadcasting of the roadside zone is automatically received.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides AM/F
The present invention relates to an audio device for a car that can receive M stereo broadcasts, receive roadside broadcasts of specific frequencies, playback from a cassette tape player, playback from a CD player, etc.

[Conventional technology]

FIG. 3 shows the configuration of an example of a conventional automobile acoustic device of this type.

In the figure, I is an antenna, 2 is an AM/FM stereo tuner, 3 is a cassette tape player, 4 is a CD player, 5 is a switch, 6 is a control microcomputer, 7 is a power amplifier, and 8 is a speaker.

When a switching command is input to the control microcomputer 6 using an operation key, the switch 5 is controlled by the control microcomputer 6 to switch between the output of the AM/FM stereo tuner 2°, the output of the cassette tape player 3, and the output of the CD player 4. The connection with the power amplifier 7 is switched.

With the conventional automobile audio system configured as above,
When receiving specific area roadside broadcasts on automobile roads, etc., after switching the switch 5 to broadcast reception connection within the broadcast area, if you do not further set the frequency,
If you are unable to receive the broadcast, or if the reception of the broadcast ends,
It was necessary to operate the device again and switch to AM/FM stereo broadcast reception mode.

[Problem to be solved by the invention]

The conventional automobile audio device as described above has a problem in that in order to receive roadside broadcasts, the device must be operated while driving the vehicle.

The present invention was made to solve the above problems,
To provide an audio device capable of automatically receiving roadside broadcasting when a car enters a roadside broadcasting area.

[Means to solve the problem]

In addition to an AM/FM stereo tuner for receiving AM/FM stereo broadcasts, the automotive audio device of the present invention includes a dedicated tuner for receiving roadside broadcasts of specific frequencies,
The reception level of this dedicated tuner is detected, and when the reception level exceeds a certain level, the control microcomputer controls the switch to switch to roadside broadcast reception, and when the reception level falls below a certain level, the control microcomputer controls the switch. The configuration is such that the mode is switched to a mode before broadcast reception, such as AM/FM broadcast reception.

〔Example〕

FIG. 1 shows the configuration of an embodiment of the present invention.

In the figure, 1, 2, 3, 4, 7.8 are the same as or equivalent to the same reference numerals in Figure 3, 5a is a switch, and 6
Reference numeral a indicates a control microcomputer, and reference numeral 9 indicates a dedicated tuner 10 dedicated to receiving roadside broadcasting at a specific frequency, which is a switch control.

FIG. 2 shows the detailed configuration of the portion surrounded by broken lines in FIG. 1.

The switch 5a has a two-stage structure, and the first stage is A.
The output of the M/FM stereo tuner 2, the output of the cassette tape player 3, the output of the CD player, and the connection to the power amplifier 7 are switched, and in the second step, the AM/F
The connection between the output of the M stereo tuner 2 and the output of the dedicated tuner 9 with the power amplifier 7 is switched.

These switchings are performed under the control of the control microcomputer 6a, and the switching is performed in the first stage in response to input commands using the operation keys, and the switch control 1
The switching in the second stage is performed in response to the input signal from 0.

The switch control 10 detects the reception level of the dedicated tuner 9, and when the reception level exceeds a certain level, sends a signal to the control microcomputer 6a to switch the connection to the power amplifier 7 to the output side of the dedicated tuner 9, and adjusts the reception level. When the level drops below a certain level, a signal is sent to switch the connection to the power amplifier 7 to the output side of the AM/FM stereo tuner 2.

When receiving roadside broadcasting, manually set the frequency of the dedicated tuner 9 in advance and set it to automatic reception mode.

AM/F by switching in the first stage of switch 5a
If the M stereo tuner 2 is connected to the power amplifier 7, when entering the roadside broadcasting area, the reception level of the dedicated tuner 9 will exceed a certain level, and the switch 5a will automatically switch to the second stage. The roadside broadcast is received.

When going outside the roadside broadcasting area, the reception level of the dedicated tuner 9 drops below a certain level, and the switch 5a is automatically switched to the second stage, and the AM/FM stereo tuner 2 side is connected to the power amplifier 7. be done.

Switch S3 shown in FIG. 2 is an automatic reception selection switch, and by turning off switch S3, automatic reception can be disabled.

Furthermore, in order to save power consumption, it is an effective means to have the dedicated tuner 9 repeat 0N10FF at regular intervals under the control of the microcomputer 6a.

〔Effect of the invention〕

As explained above, according to the present invention, when a car enters a roadside broadcasting area, roadside broadcasting can be automatically received;
Unlike conventional audio devices, there is no need to operate the device while driving, which has the effect of improving safety.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the detailed configuration of the part surrounded by the broken line in Fig. 1, and Fig. 3 is an example of a conventional automobile acoustic device of this type. FIG. 2 is a block diagram showing the configuration of FIG. 5.5a...Switch 1.6.6a...Control microcomputer, 7...Power amplifier, 8...Speaker 9...Dedicated tuner 10...Switch control Same symbols in each figure indicates the same or equivalent.

Claims (1)

[Scope of Claims] An automotive audio device that can receive AM/FM stereo broadcasts, receive roadside broadcasts of specific frequencies, play cassette tape players, play CD players, etc. by switching a switch, An AM/FM stereo tuner for receiving stereo broadcasts, a dedicated tuner for receiving roadside broadcasts of specific frequencies, and in the first stage, the output of the AM/FM stereo tuner, the output of the cassette tape player, the output of the CD player, etc. A switch that switches the connection between the output of the AM/FM stereo tuner and the output of the dedicated tuner with the power amplifier in the second stage, and commands from the operation keys. A control microcomputer that controls the first stage switching of the above switch and controls the second stage switching of the above switch according to a signal from an external circuit, and a control microcomputer that detects the reception level of the dedicated tuner and detects the reception level. When the reception level exceeds a certain level, the control microcomputer switches the second stage of the switch to the output side of the dedicated tuner, and when the reception level falls below a certain level, the control microcomputer switches the second stage of the switch to AM. /F
An automotive audio device characterized by comprising a switch control for switching to an output side connection of an M stereo tuner.