JPH11220416A - Onboard audio system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the on-vehicle audio system where damage to its antenna due to the antenna left unhoused is prevented. SOLUTION: The system is provided with a radio broadcast reception means 11 that is mounted on a vehicle and receives a radio broadcast including multiplex information multiplexed on an FM signal and an audio signal of an FM broadcast and with an antenna extract means 21 that extracts an antenna contained in the vehicle body in the case of receiving a radio broadcast and also with a multiplex broadcast reception means 11a that is contained in the radio broadcast reception means 11 and receives multiplex information multiplexed on the audio signal of the FM broadcast program and with an inhibit means 18 that inhibits the extraction of the antenna extract means 21 when the multiplex broadcast reception means 11a is instructed to receive the multiplexed information at a background position during the operation of other audio sources than that for the radio broadcast reception means 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-vehicle audio system for preventing damage to an antenna which is caused by forgetting to store a pulled-out rod antenna.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a configuration of a conventional car audio system. Hereinafter, description will be made with reference to the drawings. In-car audio systems include radio (FM,
AM), compact discs (CD), mini discs (MD), and other audio sources, as well as those capable of receiving multiplexed information transmitted by FM multiplex broadcasting. In such an audio system, general radio broadcasting (A
M, FM broadcasts), while playing CDs and MDs, you can receive multiplex information such as road traffic information in the background,
The received multiplex information is displayed in characters on a display unit such as a liquid crystal display.

[0003] Reference numeral 8 denotes an audio unit capable of receiving FM multiplex broadcasting, which is an FM / AM radio tuner 81 provided with an FM multiplex receiving circuit 81a for receiving radio broadcasting, a CD (compact disk) player 82, and an MD (mini disk) player. 83, an amplifier 84 for amplifying an audio signal from each audio source, a speaker 85 for converting the amplified audio signal into audio, a display unit 86 made of liquid crystal or the like for displaying multiplexed reception data, and an operation instruction to a control unit 88. An operation unit 87 such as a push button switch, a control unit 88 composed of a microcomputer or the like for selecting an audio source and controlling an antenna according to an instruction from the operation unit 87,
A voltage converter 89 including a transistor switch for converting the V power to a 12 V power for driving the power antenna 2 is provided. Reference numeral 2 denotes a power antenna unit for receiving a broadcast by projecting a rod-shaped antenna 22 from the surface of the vehicle, and driving the antenna driving unit 21 composed of a motor, a cam, and the like by the ANT + B signal from the voltage conversion unit 89 to thereby obtain a rod-shaped antenna. 22 is projected.

Next, the operation of the antenna will be described. CD player 82, MD as audio source by listener
When the player 83 is selected, the control unit 88 does not need to operate the power antenna 2;
L (low level) is output as the B signal. On the other hand, when the FM / AM radio tuner 81 is selected as the audio source, the control unit 82 instructs the FM / AM radio tuner 81 to receive the signal, and the ANT + B to the voltage conversion unit 89 to increase the reception sensitivity. H (high level) is output as a signal to drive the antenna driving unit 21 to cause the antenna 22 to protrude.

[0005] When a listener selects and listens to an audio source other than the radio (for example, CD player 82), the multiplexed information of the FM multiplex broadcast (in the background) is instructed in advance by an instruction from the operation unit 87 in the background. When it is instructed to receive character information, etc.), the FM multiplex receiving circuit 8
1a, the control unit 88 controls the voltage conversion unit 89 so that only multiplexed information such as characters can be immediately displayed on the display unit 86 without outputting FM sound.
H (high level) is output as a T + B signal to drive the antenna driving unit 21 to make the antenna 22 protrude.

[0006]

SUMMARY OF THE INVENTION In a conventional audio system capable of receiving FM multiplex broadcasts, a listener needs
When an instruction to receive a multiplex broadcast in the background is given even when an audio source other than the FM / AM radio tuner 81 such as the D player 82 is selected, the control unit 88 transmits the FM / AM radio tuner 81 and the FM multiplex. Receiving circuit 8
In order to operate 1a, H (high level) is output to these, so that H (high level) is inevitably output as an ANT + B signal to the voltage conversion unit 89, and the antenna driving unit 21 is driven to drive the antenna 22 Protrude.

However, since the listener is actually listening to a CD or the like and is not conscious of receiving a radio, the antenna 22 is protruded even though FM multiplex reception is selected in the background in advance. I do not notice that there is.
For this reason, there is a problem that the antenna 22 which is not stored in the antenna 22 and which enters a drive-through car wash or a garage having a limited height to damage the antenna 22 protruding from the vehicle body occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an in-vehicle audio system in which antenna damage due to forgetting to store the antenna is prevented.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a radio broadcast receiving means which is installed in a vehicle and receives a radio broadcast including multiplexed information multiplexed with FM and FM broadcast audio signals. And a vehicle-mounted audio system having an antenna extracting means for extracting an antenna housed in the vehicle at the time of the operation of receiving the radio broadcast, wherein the audio broadcast signal is included in the radio broadcast receiving means and multiplexed with an audio signal of the FM broadcast. Multiplex broadcast receiving means for receiving the multiplexed information, and the antenna when the multiplex broadcast receiving means is instructed to receive the multiplexed information in the background during operation of an audio source other than the radio broadcast receiving means. A prohibiting means for prohibiting the drawing operation of the drawing means is provided.

[0010] Further, the present invention is characterized in that there is provided a selection means for preliminarily selecting a prohibited operation or a non-prohibited operation in the prohibiting means.

[0011]

FIG. 1 is a block diagram showing the configuration of an on-vehicle audio system according to an embodiment of the present invention. FIG. 2 is a flowchart for explaining the antenna control processing of the vehicle-mounted audio system according to one embodiment of the present invention. Hereinafter, description will be made with reference to the drawings. Reference numeral 1 denotes an audio unit capable of receiving FM multiplex broadcasting, and an FM multiplex receiving circuit 1 for receiving radio broadcasting.
1a, an FM / AM radio tuner 11, a CD (compact disc) player 12, an MD (mini disc) player 13, an amplifier 14 for amplifying audio signals from respective audio sources, and converting the amplified audio signals to audio. A speaker 15, a display unit 16 made of liquid crystal or the like for displaying multiplexed data, an operation unit 17 such as a push button switch for giving an operation instruction to the control unit 18, and an audio source selection and antenna control are performed by instructions from the operation unit 17. The control unit 18 includes a microcomputer and the like, and a voltage conversion unit 19 including a transistor switch for converting a 5V power output from the control unit 18 into a 12V power for driving the power antenna 2.

An FM radio tuner that receives FM broadcasts includes a PLL that forms a local oscillator that outputs a signal of a predetermined frequency in order to select a broadcast of a specific reception frequency.
F that mixes local signals to generate an intermediate frequency and demodulate
It comprises an M detection circuit and an FM stereo demodulation circuit for reproducing the FM detection output into left and right stereo signals. The FM multiplex receiving circuit 11a is a circuit for separating the multiplexed signal multiplexed in the FM broadcast wave and displaying the multiplexed signal on the display unit 16, a multiplex detection circuit for demodulating the coded multiplexed signal, and a block for determining the presence or absence of multiplexed information. Synchronization circuit, error correction circuit for correcting errors in received data, F for storing received data as character strings
It comprises an M-multiplex character string memory, a character string font conversion circuit for converting to a character font, and the like. An AM radio tuner that receives an AM broadcast has substantially the same configuration as an FM radio tuner.

Reference numeral 2 denotes a power antenna unit which receives a broadcast by projecting a rod-shaped antenna 22 from the surface of the vehicle, and drives an antenna driving unit 21 composed of a motor, a cam and the like by an ANT + B signal from a voltage conversion unit 19 to drive the rod. The antenna 22 is projected or housed. next,
The operation of the power antenna will be described with reference to the flowchart of FIG. In step S1, it is determined whether or not the FM / AM radio tuner 11 has been selected. If the FM / AM radio tuner 11 has been selected, the process proceeds to step S7. If not, the process proceeds to step S2. This is determined from the state of the operation switch 19 for selecting the audio source (radio, CD, MD) operated by the user. When the FM / AM radio tuner 11 is selected as the audio source, the process proceeds to step S7 to receive the signal with the antenna 22 put out.
However, in this case, since the listener recognizes that the radio is being received, appropriate processing such as storing the antenna can be performed at the time of car washing or the like, and damage to the antenna can be prevented.

In step S2, FM is executed in the background.
It is determined whether or not to receive a multiplex broadcast, and if so, the process proceeds to step S3, and if not, the process is terminated. That is, in a state where the CD player 12 or the MD player 13 is operated and the sound is reproduced by the speaker 15, it is determined whether or not the FM multiplex information is received in the background. This is determined from the state of the multiplex reception selection operation switch 19 operated by the listener. When instructed to receive FM multiplex information in the background, F
The received data of the M multiplex broadcast is immediately displayed on the display unit 16.

In step S3, "Do you want to put out an antenna?" Is displayed on the display section, and the flow advances to step S4. That is,
CD player 12 and MD player 1 as audio sources
When 3 is selected, the antenna 22 is not required, so that the antenna 22 is set in advance so as not to be emitted. However, in this state, the receiving sensitivity is low. Therefore, when traveling in an area where the electric field strength is weak, the listener is asked whether to put out the antenna 22 in order to increase the receiving sensitivity.
The control unit 18 displays "Do you want to put out the antenna?"
And wait for the instructions of the listener.

In step S4, the mode is set to the FM multiplex background reception mode, and the flow advances to step S5. That is, even when the audio source is the CD player 12 or the MD player 13, the FM multiplexing circuit 11a is operated so that the FM multiplexing information can be received in the background. In step S5, a process of receiving radio is performed, and the process proceeds to step S6.
That is, the receiving frequency of the FM radio tuner is set to the frequency at which the multiplex information is transmitted. An operation constant necessary for the PLL for setting the reception frequency is set, and a local transmission signal of a frequency corresponding to the reception frequency is output to the FM detection circuit. After FM reception is amplified in high frequency, PL
The signal is mixed with the local signal of a specific frequency from L and converted to an intermediate frequency which is the frequency of the difference.

In step S6, it is determined whether or not the power antenna may be turned on, and if it is OK, the process proceeds to step S7. If not, step S8 is performed.
Move on to This determination is made based on whether or not the listener sees the content "Do you want to put out the antenna?" Displayed on the display unit 16 in step S3 and operates the operation unit 19 (antenna-on switch). When the listener instructs to operate the power antenna 2 (Y determination), the control unit 18
Outputs H (high level) as an ANT + B signal to the voltage converter 19. On the other hand, when the listener instructs not to operate the power antenna 2 (N judgment)
The controller 18 outputs L (low level) as an ANT + B signal to the voltage converter 19.

In step S7, the power antenna is turned on, and the process proceeds to step S8. That is, the antenna driving unit 21
Receives the power supply of 12 V from the voltage converter 19 and causes the antenna 22 to protrude. FM multiplex broadcasting is received with the antenna 22 out, so that high reception sensitivity can be obtained.
In step S8, FM multiplex reception is performed in the background during reception or performance of the audio source, and the process ends. That is, even when the audio source is operating, the FM multiplexing circuit 11a operates to enable FM multiplex reception, and displays the received FM multiplex information on the display unit 16 such as a liquid crystal display. The received multiplexed data is corrected for error by an error correction circuit, converted to a character string font by a character string font conversion circuit, sent to the display unit 16, and displayed as characters. If the listener instructs not to operate the power antenna 2 (N in step S6), the FM multiplex broadcast is received in a state where the antenna is not output, and the reception sensitivity of the multiplex broadcast is reduced. . However, in the case of FM multiplexed information (character information, etc.), error correction and the like are performed on received data, so that it is not affected as much as FM voice reception.

As described above, when the listener instructs to operate the power antenna 2 (step S6)
Is determined as Y), the antenna 22 is protruding, but since the antenna is put out according to the radio reception state or the listener's judgment,
It is possible to take measures such as storing the antenna 22 without forgetting to prevent the antenna 22 from being damaged. The antenna is stored when the ACC switch of the vehicle is off (or the power of the audio device is off).

As described above, in the present embodiment, when FM multiplex broadcasting is received in the background, a power antenna on / off instruction is issued according to the judgment of the listener, so that antenna damage due to forgetting to store the antenna can be prevented. . still,
In this example, the power antenna is turned on and off as in step S6.
Although off can be selected in advance, the present invention is not limited to this, and when an instruction is given to receive in the background, the power antenna may be fixedly set to be turned off without any choice as in step S6.

When the power of the audio equipment is turned on, the power antenna 2 can be set to be always on or off. In this case, since the antenna is always in either the protruding state or the stowed state, the listener can respond appropriately.

[0022]

As described above, according to the present invention, it is possible to provide an in-vehicle audio system in which antenna damage due to forgetting to store the antenna is prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a vehicle-mounted audio system according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an antenna control process of the on-vehicle audio system according to the embodiment of the present invention;

FIG. 3 is a block diagram showing a configuration of a conventional in-vehicle audio system.

[Explanation of symbols]

1 ... Audio section, 16 ...
Display unit, 11 ... FM / AM radio tuner, 17
.... operation unit, 11a ... FM multiplex receiving circuit,
18 control unit, 12 CD player,
19 ··· Voltage converter, 13 ··· M
D player, 2 ... Power antenna section, 14 ... Amplifier, 21 ...
..Antenna driving unit, 15...
22 ··· Antenna.

Claims (2)

[Claims] 1. A radio broadcast receiving means installed in a vehicle for receiving a radio broadcast including multiplexed information multiplexed into FM and an audio signal of an FM broadcast, wherein the radio broadcast receiving means is housed in the vehicle when receiving the radio broadcast. An in-vehicle audio system including an antenna extracting means for extracting an antenna, wherein the multiplex broadcasting receiving means is included in the radio broadcast receiving means and receives multiplexed information multiplexed on the FM broadcast audio signal; Prohibiting means for prohibiting the extraction operation of the antenna extraction means when the multiplex broadcast reception means is instructed to receive the multiplex information in the background during the operation of the audio source other than the reception means. Features a car audio system. 2. The in-vehicle audio system according to claim 1, further comprising a selection unit for previously selecting a prohibited operation or a non-prohibited operation in said prohibiting unit.