JP2000252847A - Video and audio device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain tuner characteristics a simple constitution, without wiring an antenna around by making it possible to operate a tuner part provided separately from a device main body, from the device main body. SOLUTION: With a control data signal that the microcomputer interface signal 6 from the control microcomputer of a system stereo device main body gives, a tuner block 12 is controlled to perform AM/FM switching, a program is selected, and with a microcomputer interface signal 35, its response is detected to receive demodulated character data of RDS communication included in a composite signal output 30. Boscially, an FM antenna terminal is connected to an FM simple antenna and to an FM external antenna terminal. Consequently, the reception sensitivity is improved by placing the tuner block 12 at a distance from the device main body at a place where the antenna sensitivity is high, for example, at the window. Furthermore, only the cable is wired between the tuner block 12 and device main body, and the device can be laid out according to the user preference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video / audio device, and more particularly to a video / audio device having a tuner.

[0002]

2. Description of the Related Art Recently, in a system stereo apparatus or a video / audio apparatus such as a television receiver in which a tuner portion is built in a main body, an increase in high-frequency digital noise from a digital circuit incorporated in a set has been increased. The demand for smaller sets has made it increasingly difficult to improve and maintain tuner characteristics.

In order to maintain and improve the tuner characteristics,
For example, there are methods to shield the entire tuner block, put various noise traps in the signal line, shield the antenna cable itself, and increase the selectivity in the circuit so as not to be disturbed by noise. Has been taken. In particular, models that can play digital media such as mini-discs with a small microcomponent take extremely long time and cost to take measures against noise.

From another viewpoint, the lead of the attached antenna is lengthened in order to increase the degree of freedom of wiring in order to improve the usability of the user, and to extend the attached simple antenna close to the window to increase the sensitivity. And other measures have been taken.

FIG. 8 shows an example of an antenna terminal of a conventional video / audio device with a built-in tuner. In such a conventional example, the AM antenna terminal 51, the AM / FM ground terminal 5
2, 75Ω FM antenna terminal 53 and 300Ω FM antenna terminal 54 are arranged in this manner. As described above, in the conventional video / audio device, the antennas 55 and 56 for AM are used.
Since the antennas 57 for FM and FM are separate from each other, it is necessary to take measures to lengthen each wiring as needed. However, increasing the length of the lead of the antenna leads to an increase in cost, and there is a problem that the wiring portion becomes difficult to see because separate wires are drawn around from the set body for a long time.

On the other hand, in the case of a system stereo apparatus or the like, a tuner portion having a single structure including an independent housing and an independent power circuit has been conventionally seen, but such a structure increases the size of the entire apparatus. At the same time, it is necessary to provide an independent commercial power supply connector and a commercial power supply, and thus there is a problem that the tuner cannot always be set up freely.

[0007]

As described above, there are many problems in the countermeasures against noise for maintaining the tuner characteristics in conventional video / audio devices such as system stereos and television receivers. There were also many problems that came from routing. SUMMARY OF THE INVENTION The present invention solves this problem, and has a relatively simple configuration, can maintain the tuner characteristics without arranging a wiring such as an antenna, and can be spatially easily and easily viewed. Video with
The objective is to realize an acoustic device.

[0008]

To achieve the above object, the present invention relates to a video / audio apparatus comprising a tuner section for receiving a high frequency signal, selecting a target signal from the high frequency signal, and demodulating the selected signal. The tuner section is provided separately from the apparatus main body, and the operation of the tuner section is performed from the apparatus main body.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a video / audio device according to the present invention.

FIG. 1 is an external view showing the configuration of an embodiment of a video / audio device according to the present invention. In this embodiment, a system stereo device will be described as an example of a video / audio device. In FIG. 1, reference numeral 11 denotes a system stereo device main body, reference numeral 12 denotes a tuner block,
Reference numeral 13 is a connection cable, reference numeral 14 is an FM simple antenna, and reference numeral 15 is an FM external antenna terminal. The tuner block 12 is formed separately from the main body 11 of the system stereo, and includes an AM antenna, an AM / FM tuner circuit, a demodulation circuit, and the like.

With such a configuration, the tuner block 12 can be placed in a place with high antenna sensitivity, such as near a window, away from the system stereo apparatus main body 11, thereby improving the reception sensitivity. In addition, since the routing of the wiring can be accommodated only by the connection cable 13, the wiring can be neat and the layout can be adjusted to the user's preference.

FIG. 2 is an external view showing the configuration of another embodiment of the video / audio apparatus of the present invention, and is an example of a wall-mounted stereo apparatus. In FIG. 2, reference numeral 11 denotes a wall-mounted stereo device main body, reference numeral 12 denotes a tuner block, and reference numeral 13 denotes a connection cable. As described above, even in the case of the wall-mounted stereo device, the tuner block 12 is formed separately from the device main body 11 of the wall-mounted stereo, and the tuner block 12 is arranged at a location having a high antenna sensitivity such as a window away from the device main body 11 in accordance with the user's preference. It can improve the reception sensitivity, improve the layout of the equipment, and clean the wiring.

FIG. 3 shows an example of a pull-out connector for pulling out the connecting cable 13 on the back panel side of the apparatus main body 11 in the embodiment of FIG. 1 or FIG. In the example of FIG. 3, a mini DIN connector is used for connection, and the tuner block 12 and the apparatus main body 11 are configured to be connected with one touch. A similar connector is provided on the tuner block 12 side.

FIG. 4 shows an example of a circuit block diagram of the tuner block 12 of the embodiment of FIG. 1 or 2 as an audio tuner. In FIG. 4, reference numeral 21 indicates F
M antenna terminal, reference numeral 22 is an FM front end, reference numeral 23 is an intermediate frequency amplifier, reference numeral 24 is a stereo demodulator, reference numeral 25 is a bar antenna having an AM built-in antenna, reference numeral 2
Reference numeral 6 denotes an AM high frequency circuit, reference numeral 27 denotes a phase-locked loop (PLL) circuit, reference numeral 28 denotes a low-pass filter, and reference numeral 29 denotes a 5 VDC-DC converter. The signals included in the 13-core cable include a composite signal output 30, a line output (2 cores) 31, a 12V power supply 32, and a ground (2 cores) 3.
3, a microcomputer interface signal input (6 cores) 34 and a microcomputer interface signal output 35.

In this example, the apparatus main body 11 is
The tuner block 12 is controlled by a control data signal given by a microcomputer interface signal from the control microcomputer, switching of AM / FM, program selection, and the like are performed. A response is detected by a microcomputer interface signal output 35, and a composite signal output is performed. RD included in 30
Receives demodulated character data of S (Radio Data System) communication. Further, in this example, basically, it is considered that the FM antenna terminal 21 is connected to the FM simple antenna or the FM external antenna terminal. However, for example, a headphone or an earphone wire of a portable radio is used for the FM antenna. Using a 13-core cable,
It is also possible to simply have the function of an antenna.

When the tuner block 12 shown in FIG. 4 is used, exactly the same software as in the case where the tuner block is built in the main body can be used. can do.

FIG. 5 is another example of a circuit block diagram of the tuner block 12 as an audio tuner.
In this example, the tuner block 12 includes an RDS decoder and a small-scale microcomputer such as a one-chip microcomputer to minimize the number of cable cores. In FIG. 5, reference numeral 41 denotes an RDS decoder, reference numeral 42 denotes a small-scale microcomputer, reference numeral 36 denotes a two-core bidirectional bus such as an audio bus, and the same parts as those in FIG. Numbered.

In this example, a control command signal from the apparatus main body 11 is given as serial data on a two-core bidirectional bus 36, and the small-scale microcomputer 42 decodes the serial data and sends a control data signal inside the tuner block 12. Output. The RDS decoder 41 decodes the composite output signal from the stereo demodulator 24 and sends the decoded contents to the small-scale microcomputer 42. The small-scale microcomputer 42 sends the contents as serial data to the main body 11 together with a control response signal through the two-core bidirectional bus 36. By adopting such a method, the number of cores of the cable between the apparatus main body 11 and the tuner block 12 can be suppressed to the minimum number of 7 cores.

FIG. 6 shows the tuner block 1 shown in FIG.
2 shows an example of a flowchart of control software in the case where No. 2 is adopted. Starting at step 100, step 10
In step 1, it is determined whether the current command is a tuner function. If it is not a tuner function, it is ignored. If it is a tuner function, the process proceeds to step 102, where it is determined whether to receive FM broadcast or AM broadcast.

In the case of FM reception, the tuner phase locked loop circuit 27 is switched to the FM side and the FM band in step 103, and the tuning frequency is set in step 104. Next, at step 105, the intermediate frequency is counted, and it is determined whether or not the tuning has been achieved with a predetermined count value. If not, the intermediate frequency is counted again. If a predetermined count value is obtained in step 105, step 1
At 06, a display indicating that synchronization has been taken is displayed, and at step 107, it is determined whether or not there is RDS communication in the composite signal output 30. If there is an RDS communication, an RDS process of decoding the contents of the RDS communication and sending it to the apparatus main body 11 is performed in step 108. When there is no RDS communication or after the RDS process is completed, the process proceeds to step 109, where the small-scale microcomputer 42 of the tuner block is set to the sleep mode, and the current process is completed.

In the case of AM reception, step 110
The tuner phase locked loop circuit 27 on the AM side,
Switching to the AM band, the tuning frequency is set in step 111. Next, at step 112, the intermediate frequency is counted, and it is determined whether or not tuning has been achieved with a predetermined count value.
If not, the intermediate frequency is counted again.
If a predetermined count value is obtained in step 112, a display indicating that synchronization has been obtained is made in step 113, and thereafter, the process proceeds to step 109, where the small-scale microcomputer 42 of the tuner block is set to the sleep mode and the current processing is performed. finish.

If a command from the apparatus main body 11 or any state change is detected during the sleep mode, step 1
In step 10, the sleep mode is released, and the process proceeds to step 102, where it is determined whether to receive the FM broadcast or the AM broadcast.

FIG. 7 is an assembly diagram (a) when the tuner block 12 shown in FIG. 4 or FIG. 5 is configured to be the smallest by combining current elements, and an external view (b) after being housed in a housing. It is. In this configuration, the tuner block 12
The whole can be housed in a cubic housing having a size of about 100 × 80 to 90 × 20 (mm), and can be made relatively small and lightweight.

As described above, according to the present invention, the layout of the tuner block is largely free, it can be installed at a desired position and at the location with the best sensitivity, and it is unsightly even if the wiring is routed. Since the processing can be performed without any problems, the merit seen from the user is improved. Also,
Unlike the conventional one, there is no need to worry about the space layout for providing the tuner part in the device main body, and the device design can be freely performed, and the tuner block can be commonly used for several models, There are advantages in terms of design.

Further, as in the conventional antenna processing, the AM
AM is only connected to the DIN connector, and FM is the antenna, without troublesome processing such as connecting two antenna leads, two conductors of the FM coaxial cable and two shields to the terminal board. If an external FM antenna is used, it can be easily connected to the tuner block using an F connector or the like without using anything when the lead wire of the tuner block is used. Further, in the configuration of this tuner block, there are relatively few restrictions on the arrangement, and only the connector portion and the AM ferrite bar antenna need to be out of the shield, so that the tuner block can be made small and lightweight.

In the above description, the present invention has been described for a system stereo apparatus as an example of a video / audio apparatus.
It goes without saying that the same concept holds for video and audio devices such as television receivers.

Further, in the above embodiment, the operation has been described as being performed from the apparatus main body 11 of the video / audio apparatus. However, operation keys and switches are provided in the tuner block 12 so that the operation from the tuner block 12 can be performed. Can also be enabled. Further, the power supply to the tuner block 12 has been described as being performed from the apparatus main body 11, but a power supply device including a battery or the like may be provided in the tuner block 12 so that the power supply can be performed independently.

[0028]

As described above, according to the first aspect of the present invention, there is provided a video / video having a tuner section for receiving a high-frequency signal, selecting a target signal from the high-frequency signal and demodulating the selected signal.
The acoustic device is characterized in that the tuner section is provided separately from the apparatus main body, and the operation of the tuner section can be performed from the apparatus main body. This increases the degree of freedom of the tuner layout, allows the tuner to be installed at any position and at the location with the best sensitivity, and allows the tuner to be processed clearly and neatly even when the wiring is routed. A video / sound device having a unit can be realized.

According to a second aspect of the present invention, power is supplied to the tuner section from the apparatus main body. This eliminates the need to provide a unique power supply to the tuner unit, and allows the tuner unit to be small and lightweight. Further, it is possible to eliminate the routing of the AC power supply.

[Brief description of the drawings]

FIG. 1 is an external view showing the configuration of an embodiment of a video / audio device according to the present invention.

FIG. 2 is an external view showing the configuration of another embodiment of the video / audio device of the present invention.

FIG. 3 is a diagram showing an example of a connection cable pull-out connector on the back panel side of the apparatus main body in the embodiment shown in FIG. 1 or FIG. 2;

FIG. 4 is a circuit block diagram of an example of a tuner block in the embodiment of FIG. 1 or FIG. 2;

FIG. 5 is a circuit block diagram of another example of the tuner block in the embodiment of FIG. 1 or 2;

FIG. 6 is a flowchart of control software when the tuner block shown in FIG. 5 is employed.

FIG. 7 is an assembly view and an external view of the tuner block shown in FIG. 4 or FIG.

FIG. 8 shows a conventional example of an antenna terminal of a video / audio device with a built-in tuner.

[Explanation of symbols]

11: Device main body, 12: Tuner block, 13: Connection cable, 14: FM simple antenna, 15: FM external antenna terminal, 21: FM antenna terminal, 22: FM front end, 23: Intermediate frequency amplifier, 24: Stereo demodulation 25, AM bar antenna, 26, AM high frequency circuit, 27, phase locked loop (PLL) circuit, 2
8 ... Low-pass filter, 29 ... 5VDC-DC converter, 3
0: Composite signal output, 31: Line output, 32:
12V power supply, 33 ... ground, 34 ... microcomputer interface signal input, 35 ... microcomputer interface signal output,
36 ... 2-core bidirectional bus, 41 ... RDS decoder, 42 ...
Small microcomputer, 51 ... AM antenna terminal, 52 ... AM
・ FM ground terminal, 53… 75Ω FM antenna terminal, 5
4: 300Ω FM antenna terminal, 55, 56: AM antenna, 57: FM antenna

Claims (2)

[Claims] 1. An audio / video apparatus comprising a tuner section for receiving a high-frequency signal and selecting and demodulating a target signal from the high-frequency signal, wherein the tuner section is provided separately from a main body of the apparatus. The image / sound device can be operated from the device main body. 2. The video / audio device according to claim 1, wherein power supply to the tuner unit can be performed from the device main body.