JPH11242877A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device that is capable of displaying a lot of information and that is also low in cost. SOLUTION: Relating to a car audio equipment consisting of a head unit 1 having at least an antenna input terminal 1a and a display unit 1c, an RF modulator 3 connected to the antenna input terminal 1a, and an input source unit 2 connected to the RF modulator 3; the RF modulator 3 is equipped with an FM multiplex modulation part 3a, and the head unit 1 is equipped with an FM multiplex demodulation part 1b, displaying information relating to the input source unit 2 in the display unit 1c of the head unit 1 through the RF modulator 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a display device.

[0002]

2. Description of the Related Art Conventional car audio devices include genuine products in addition to commercially available products. Here, the term "genuine" is a term for "commercially available", and in the case of commercially available car audio equipment, a car audio manufacturer uses a head unit (such as a receiver or a combination of a receiver and a cassette deck) to replace the manufacturer's disc changer. Although it can be controlled, genuine products are installed by vehicle manufacturers at factories and dealers, and may not be directly connected to car audio equipment of general car audio manufacturers.

Therefore, as shown in FIG. 2, for example, when it is desired to connect a commercially available CD or MD (mini-disc) disk changer 12 to the genuine head unit 11, an RF modulator 13 is used as a relay device. The input side of the RF modulator 13 is connected to the antenna 14 and the disc changer 12, and the output side is connected to the antenna input terminal 11 a of the genuine head unit 11. Further, a display device 15 including a remote control light receiving unit 15a that receives a remote control signal from a changer control remote control transmitter 16 is connected to the RF modulator 13. (Because the disc changer 12 is used by being stored in the trunk of the car, the remote control light receiving unit 15a is incorporated in the display device 15 that is placed in a place where the driver can see, not the disc changer.) The disc playback audio output from 12 is modulated by the RF modulator 13 to become an RF signal.

When it is desired to receive a broadcast such as an FM broadcast, the output of the antenna 14 is supplied to the antenna input terminal 11 a of the genuine head unit 11 through the RF modulator 13. When the disc changer 12 is to be used, the output of the antenna 14 is switched to an RF signal based on a disc playback audio output from the disc changer 12 and supplied. The genuine head unit 11 demodulates the RF signal supplied to the antenna input terminal 11a to obtain a disk reproduction audio signal.

[0005]

By the way, in the above configuration, the disc information obtained by the disc reproduction by the disc changer 12 is not displayed on the display section 11a of the genuine head unit 11, so that the RF modulator 1
3 is connected to a dedicated display device 15, and the image is displayed on the display device 15. Further, the display by the display device 15 is limited to the extent that the disk number and the track number in the disk information are displayed. Therefore, there is a problem in that the display of the disc information of this degree has a poor content, and requires a mounting space in order to use a dedicated display device.

An object of the present invention is to provide a display device which solves the above-mentioned conventional problems.

[0007]

According to a first aspect of the present invention, there is provided a display unit including a head unit having at least an antenna input terminal and a display unit, and an RF modulator connected to the antenna input terminal. And the RF
In a car audio device comprising an input source device connected to a modulator, the RF modulator comprises
An M multiplex modulation unit is provided, and the head unit is provided with an FM multiplex demodulation unit, and display information on the input source device is displayed on the display unit of the head unit via the RF modulator.

[0008] The display device according to the present invention is described in claim 2.
In the display device according to the first aspect, the input source device is a disc changer, and the display information is disc information.

[0009]

FIG. 1 is a block diagram showing one embodiment of a display device according to the present invention. In FIG. 1, reference numeral 1 denotes a genuine head unit, which includes an antenna input terminal 1a,
An M multiplex demodulation unit 1b and a display unit 1c are provided. (Note that the genuine head unit 1 has other essential components as a car audio device, but is omitted here for the sake of explanation of the present invention.) 2 is a commercially available disc changer that is an input source device Reference numeral 3 denotes an RF modulator, 4 denotes an FM antenna, 5 denotes a remote control light receiving unit, and 6 denotes a remote control transmitter. The RF modulator 3 includes an FM multiplex modulator 3a in addition to the conventional components. Also,
The RF modulator 3 is connected to a remote control light receiving unit 5 that receives a remote control signal from a changer control remote control transmitter 6.

In the above configuration, the output of the disc changer 2 (including audio output and disc information) is RF
The RF signal is subjected to FM multiplex modulation by the FM multiplex modulation section 3a of the modulator 3 and supplied to the antenna input terminal 1a of the genuine head unit 1. Here, the FM multiplex modulation unit 3
The FM multiplex modulation performed in a is, for example, DARC (DAt
a Radio Channel) and the like. For example, a disk reproduction audio signal is a main channel signal, and disk information is FM multiplexed as a sub channel signal.

When the FM multiplex modulation signal from the RF modulator 3 is input to the antenna input terminal 1a of the genuine head unit 1, it is demodulated by the FM multiplex demodulation unit 1b to obtain a disk reproduction audio signal and a disk information signal. The obtained disk reproduction audio signal is supplied to an audio signal processing system (not shown). On the other hand, the obtained disc information is supplied to the display unit 1c and displayed.

In addition to the disc number and the track number, the display section 1c displays a disc title preset by the user or a title originally recorded on the disc such as a CD-TEXT (including a track number and a time code, of course). Etc. can be displayed.

As described above, a large number of disc information can be displayed in addition to the conventional display of the disc number and track number, and the display is performed by the display unit built in the genuine head unit. It is not necessary to use such a dedicated display device, which leads to cost reduction.

In recent years, as a genuine head unit, F
Since there is already one that supports M multiplex broadcasting, it may be used as it is as the genuine head unit 1.

[0015]

In the above embodiment, a display device in which a disc changer is used as an input source device has been described. However, the present invention is not limited to this. For example, a retrofit TV receiver connected to an antenna input terminal or a car navigation system may be used. It is also applicable to information display of a device or the like.

[0016]

According to the present invention, a display device which can display a large amount of information and is inexpensive can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a display device according to the present invention.

FIG. 2 is a block diagram illustrating an example of a conventional display device.

[Explanation of symbols]

 Reference Signs List 1 genuine head unit 1a antenna input terminal 1b FM multiplex demodulation unit 1c display unit 2 disk changer 3 RF modulator 3a FM multiplex modulation unit 4 antenna 5 remote control light receiving unit 6 remote control transmitter

Claims (2)

[Claims] 1. A car audio apparatus comprising: a head unit having at least an antenna input terminal and a display unit; an RF modulator connected to the antenna input terminal; and an input source device connected to the RF modulator. The RF modulator includes an FM multiplex modulation unit, the head unit includes an FM multiplex demodulation unit, and display information on the input source device is displayed on the display unit of the head unit via the RF modulator. Display device. 2. The display device according to claim 1, wherein the input source device is a disc changer, and the display information is disc information.