JPH077682A - Television receiver - Google Patents

Abstract

PURPOSE:To provide a television receiver equipped with the BS antenna of automatic tracking capable of stably obtaining a bearing fluctuation amount due to the travelling of a mobile object and smoothly performing the automatic tracking of the BS antenna. CONSTITUTION:The BS antenna 42 connected to the main body 11 of this television receiver mounted to the mobile object is rotatably supported by an antenna base 41. The bearing fluctuation amount theta is obtained by a controller 44 by a steering angle theta' (t) detected in a steering angle detection circuit 46 and a velocity v (t) detected in a vehicle speed detection circuit 47 and the BS antenna 42 is rotated in a direction opposite to a rotation direction corresponding to the bearing fluctuation amount theta of the mobile object for the bearing fluctuation amount theta by the antenna base 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver equipped with a BS antenna for automatic tracking, which is used for vehicles such as automobiles.

[0002]

2. Description of the Related Art Recently, small-sized television receivers are often used for vehicles mounted on vehicles such as automobiles.
A built-in S tuner that can receive satellite TV broadcasts is being put to practical use.

A television receiver mounted on a vehicle is equipped with an automatic tracking BS antenna so as to stably receive broadcast radio waves from satellites. FIG. 5 shows an example of a television receiver equipped with a conventional BS antenna for automatic tracking, in which a BS antenna 3 attached to an antenna stand 2 is connected to a television receiver main body 1. Antenna stand 2
Causes the satellite to track the BS antenna 3,
The BS antenna 3 can be rotated by the motor 4. On the other hand, reference numeral 5 denotes a controller, and the controller 5 includes an electric field level signal of the BS antenna 3 detected by the electric field level detection circuit 6 and an output of the angular velocity sensor 7 associated with the movement of the automobile, etc. θ is given. The output of the controller 5 according to the electric field level signal and the direction change amount θ is given to the motor drive circuit 9 to control the motor 4.

However, in the flowchart shown in FIG. 6, first, the antenna 3 is rotated until an electric field is detected and the electric field is detected (step 601). And the position of the antenna where the peak electric field is detected is recognized, the movement of the antenna 3 is stopped and the direction change amount θ and the non-magnetic field detection counter are reset (step 60).
2). In addition, the output detected by the angular velocity sensor 7 is used as an integrator 8
Azimuth change amount θ obtained by integration at (steps 603 to 6)
05), the direction of the antenna 3 is corrected (step 6).
06). Then, it is judged whether or not an electric field is detected from the output of the antenna 3 (step 607), and if YES, it is judged whether or not the electric field level is attenuated from the previous electric field level (step 608).
If it is attenuated to 6, the process returns to step 602, and the above operation is repeated. If NO in step 607, the no-electric-field time is incremented while the counter value n is incremented by 1 (step 609), it is determined that the count value n is equal to or greater than the predetermined value x (step 610), and if NO, step 601. , YES, the process returns to step 606 to repeat the above operation.

[0005]

In the television receiver equipped with the BS antenna for automatic tracking configured as described above, the angular velocity sensor 7 is used to detect the change in direction when the vehicle is running. A gyro is generally used for. However, since this type of gyro is vulnerable to vibration due to its nature and it takes a relatively long time to stabilize its operation, it may not be possible to obtain a stable azimuth change amount due to traveling by a moving body. There was a problem that the automatic tracking of the antenna was not performed smoothly and lacked a sense of stability.

The present invention has been made in view of the above circumstances, and it is possible to obtain a stable azimuth change amount due to traveling of a moving body.
An object of the present invention is to provide a television receiver equipped with a BS antenna for automatic tracking that can perform automatic tracking of the S antenna stably and smoothly.

[0007]

According to the present invention, there is provided a television receiver main body mounted on a mobile body, a BS antenna connected to the television receiver main body, and an antenna base rotatably supporting the BS antenna. Steering angle detecting means for detecting a steering angle of the moving body, speed detecting means for detecting a moving speed of the moving body, steering angle detected by the steering angle detecting means, and movement detected by the speed detecting means The azimuth change amount is obtained from the speed, and the control unit is configured to rotate the BS antenna by the amount corresponding to the azimuth change amount in a direction opposite to the rotation direction of the moving body according to the azimuth change amount.

[0008]

As a result, according to the present invention, the azimuth change amount is obtained from the steering angle and the moving speed of the moving body, and the BS antenna is moved in the rotational direction corresponding to the azimuth change amount of the moving body by the azimuth change amount. I am trying to rotate it in the opposite direction, and compared to the one using a conventional angular velocity sensor,
Stable operation can be obtained in a short time without being affected by vibration, and the amount of azimuth change due to traveling of the moving body can be stably obtained.
Automatic tracking of the S antenna can be performed stably and smoothly.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration when the present invention is applied to a liquid crystal television receiver mounted on an automobile. In the figure, 11 is a television receiver main body, and a BS antenna automatic tracking control unit 12 is connected to the television receiver main body 11.

The television receiver main body 11 has a terrestrial tuner 21 and a BS tuner 22.
Captures broadcast radio waves received by the terrestrial antenna 231, selects a designated channel according to a tuning signal from the control circuit 29, and converts the selected channel into an intermediate frequency signal. Further, the BS tuner 22 uses the BS antenna 42, which will be described later, via the BS antenna automatic tracking control unit 12.
The broadcast radio wave received in step 3 is taken in, a designated channel is selected according to the tuning signal from the control circuit 29, and is converted into an intermediate frequency signal.

The terrestrial tuner 21 and the BS
The output from the tuner 22 is sent to the TV via the switch 23.
It is sent to the linear circuit 24. The TV linear circuit 24 includes an intermediate frequency amplification circuit, a video detection circuit, a video amplification circuit, and an AFT.
It has a detection circuit and the like, amplifies an intermediate frequency signal given from the terrestrial tuner 21 or the BS tuner 22, detects a video signal, extracts an audio signal from the output signal, and outputs it to the audio circuit 25. I am trying to give.

The audio circuit 25 has an audio detection circuit and an audio amplification circuit, detects an audio signal supplied from the TV linear circuit 24 and converts it into a low frequency signal, and amplifies the audio to drive the speaker 26. I am trying.

The TV linear circuit 24 amplifies the output signal of the video detection circuit by the video amplification circuit, and then the chroma circuit 27,
The period separation circuit 28 is supplied. Also TV
The linear circuit 24 outputs the output signal of the intermediate frequency amplification circuit to the AF circuit.
AFT detection is performed by the T detection circuit, and an S-shaped AFT signal is extracted and given to the control circuit 29.

The cycle separation circuit 28 separates the horizontal and vertical sync signals contained in the video signal into a composite sync signal C-SY.
NC is given to the control circuit 29, and the horizontal synchronizing signal H
-SYNC and the vertical synchronizing signal V-SYNC are applied to the timing control circuit 30.

The control circuit 29 receives key input data such as key setting data and tuning up / down instruction from the key input unit 311, and the key setting data and tuning up / down instruction and the AFT from the TV linear circuit 24. A tuning signal is generated based on the signal and given to the terrestrial tuner 21 or the BS tuner 22. Further, the control circuit 29 uses the key input unit 311.
The switching signal of the switch 23 is output according to the key setting data.

The timing control circuit 30 has a sampling signal φ based on the horizontal sync signal H-SYNC and the vertical sync signal V-SYNC provided from the sync separation circuit 28.
s is created and given to the A / D conversion circuit 31.

The A / D conversion circuit 31 samples the chroma signal output from the chroma circuit 27 based on the sampling signal φs, converts the chroma signal into 3 to 4 bit digital data, and supplies it to the segment driver 32. There is. Further, the timing control circuit 30 generates a timing signal for display control based on the synchronization signal supplied from the synchronization separation circuit 28, and controls the operation of the segment driver 32 and the common driver 33.

In this case, the common driver 33 generates a scanning signal according to the timing signal from the timing control circuit 30 and sequentially drives the common electrodes of the LC panel 34, and the segment driver 32 supplies it from the A / D conversion circuit 31. 3 to 4 bits of video data are sequentially read by the timing signal of the timing control circuit 30 and one line of video image data is read, then a gradation signal is created according to the video data, and the segment of the LC panel 34 is created. The electrodes are driven for display.

FIG. 2 shows a BS antenna automatic tracking control unit 12
Shows a schematic configuration of. In this case, the BS antenna 22 attached to the antenna base 41 is connected to the BS tuner 22 of the television receiver body 11 described above. Antenna stand 4
1 is a BS antenna 42 rotatably supported,
The BS antenna 4 is connected to the satellite by connecting the motor 43.
2 is tracked and rotated.

On the other hand, 44 is a controller, to which an electric field level detection circuit 45, a steering angle detection circuit 46, a vehicle speed detection circuit 47 and a motor drive circuit 48 are connected.

Here, the electric field level detection circuit 45 is
The electric field level of the antenna 42 is detected and output as an electric field level signal. The steering angle detection circuit 46 outputs the steering angle θ ′ (t) of the vehicle, and the vehicle speed detection circuit 47 outputs the speed v (t) from the rotation speed of the wheels of the vehicle. Controller 4
4 is the steering angle θ ′ (t) of the automobile and the speed v
The azimuth change amount θ is obtained from (t) based on the following equation.

[0022]

[Equation 1]

In this case, the steering angle θ'of the vehicle body
The relationship between (t), the speed v (t) and the direction change amount θ is as shown in FIG. In the figure, f
(Θ ′ (t)) = r (t) is the steering angle θ ′
It is a turning radius with respect to (t), and varies depending on the vehicle body of the automobile.

The controller 44 also generates a control signal for the motor drive circuit 48 based on the direction change amount θ obtained by the above equation and the electric field level detected by the electric field level detection circuit 45. The motor drive circuit 48 outputs the control signal from the controller 44. The motor 43 is controlled by the control signal supplied.
Are trying to control.

That is, the controller 44 in this case is
The BS antenna 42 is rotated by the antenna base 41 in the direction opposite to the rotation direction corresponding to the direction change amount θ of the automobile by the direction change amount θ obtained by the above formula (in this case, the elevation angle is always fixed and only the horizontal direction rotation is performed). In addition, the angle of the BS antenna 42 is finely adjusted by the electric field level detected by the electric field level detection circuit 45.

In such a television receiver, however, the BS tuner 22 is currently selected via the switch 23 according to the instruction of the control circuit 17 in accordance with the key setting data of the key input unit 311. And

In this state, the radio waves received by the BS antenna 42 are taken into the BS tuner 22 and the designated channel is selected. Then, the intermediate frequency signal of the designated channel is sent to the TV linear circuit 24, an audio signal is given from the TV linear circuit 24 to the audio circuit 25, and an audio is output from the speaker 26. Also, the TV linear circuit 24
The image detection signal is a chroma circuit 27 and a cycle separation circuit 28.
Given to. The chroma signal from the chroma circuit 27 is given to the A / D conversion circuit 31, converted into a digital signal by the sampling signal φs of the timing control circuit 30, and given to the segment driver 32. Also,
A timing signal for display control is sent from the timing control circuit 30 to the segment driver 32 and the common driver 33.
, The common electrode of the LC panel 34 is driven by the common driver 33, and the digital signal from the A / D conversion circuit 31 is read by the segment driver 32 and the video data for one line is read. The segment electrodes of the LC panel 34 are driven to display the received image on the LC panel 34.

In this state, as the automobile equipped with such a liquid crystal television receiver runs, in the BS antenna automatic tracking control unit 12, the antenna base 41 with the BS antenna 42 attached is rotated by the motor 43, and the satellite 43 is rotated. Then, the BS antenna 42 controls the tracking.

In this case, in the flow chart shown in FIG. 4, the BS antenna 42 is first rotated until the electric field is detected. Then, when the electric field is detected (step 40)
1) From this position, the antenna 42 is swung left and right at low speed to detect the peak electric field, and when the antenna position where the peak electric field is detected is recognized, the movement of the antenna 42 is stopped, and the azimuth change amount θ and the absence The magnetic field detection counter is reset (step 402).

Next, the steering angle detection circuit 46 detects the steering angle θ '(t) of the vehicle, and the vehicle speed detection circuit 47 detects the speed v (t) from the rotational speed of the wheels of the vehicle (step 403, Step 404). Then, the detected steering angle θ ′ (t) and speed v (t) are given to the controller 44,
The direction change amount θ is calculated from the above equation (1) (step 4
05). Then, the direction of the BS antenna 42 is corrected by the direction change amount θ (step 406). in this case,
The BS antenna 42 is rotated by the antenna base 41 in the direction opposite to the rotation direction corresponding to the direction change amount θ of the automobile by the amount of the direction change amount θ (in this case, the elevation angle is always fixed and only the horizontal direction is rotated).

Next, it is judged whether an electric field is detected from the output of the BS antenna 42 (step 407). Here, if the electric field is detected and if YES, it is determined whether the electric field level is attenuated from the previous electric field level (step 40).
8). If it is not attenuated, the process returns to step 406 to repeat the above operation, and if it is attenuated, the process returns to step 402 to repeat the above operation.
The angle of the BS antenna 42 is finely adjusted. .

If no electric field is detected in step 407 and the result is NO, the no-electric-field time is incremented by 1 for the counter value n.
While counting (step 409), count value n
Is determined to be equal to or greater than the predetermined value x (step 410), and if NO, returns to step 401, and if YES, returns to step 406 to repeat the above-described operation.

As a result, in the BS antenna automatic tracking control unit 12, the controller 44 uses the steering angle θ '(t) and the speed v (t) detected by the steering angle detection circuit 46 and the vehicle speed detection circuit 47 as the vehicle travels. The amount of change θ is obtained, and a control signal is generated based on this direction change amount θ and given to the motor drive circuit 48 to control the motor 43.
1 causes the BS antenna 42 to rotate in the direction opposite to the rotation direction of the automobile by the direction change amount θ, and the angle is finely adjusted using the detected electric field level.
The BS antenna 42 can be tracked and controlled with respect to the broadcasting satellite.

BS for such a broadcasting satellite
By controlling the tracking of the antenna 42, the input level given from the BS antenna 42 to the BS tuner 22 of the receiver main body 11 is always the highest level, so that the receiver main body 11 side has the best satellite broadcast radio wave. Will be able to receive and receive high-quality TV broadcasts.

Therefore, in this way, the direction change amount θ is obtained from the steering angle θ ′ (t) and the speed v (t) when the vehicle is traveling, and the BS antenna tracking control for the satellite is performed by this direction change amount θ. As the gyro is used as an angular velocity sensor to obtain the amount of heading change θ in the past, it is weak against vibration and takes a relatively long time to stabilize its operation. Since the BS antenna cannot be smoothly tracked because it cannot be obtained, there is a problem that stability is lacked, and stable operation can be obtained in a short time without being affected by vibration. By solving the conventional inconvenience, it is possible to obtain a stable azimuth change amount due to running of the vehicle, and it is possible to stably and smoothly carry out the automatic tracking of the BS antenna. In this way, it is possible to capture the radio waves from the broadcasting satellite and receive high-quality TV broadcasting.

The present invention is not limited to the above-mentioned embodiments, and can be carried out by appropriately modifying it without changing the gist.
For example, in the above-described embodiment, the portable liquid crystal television is explained, but the invention can be applied to television receivers of other systems.

[0037]

According to the present invention, the azimuth change amount is obtained from the steering angle and the moving speed of the moving body, and the BS antenna is moved in the rotating direction corresponding to the azimuth change amount of the moving body by the azimuth change amount. Compared with the one using a conventional angular velocity sensor, stable operation can be obtained in a short time without being affected by vibration, and the amount of azimuth change due to traveling of the moving body can be stabilized. Obtained by B
The S-antenna can be automatically tracked stably and smoothly, so that the radio waves from the broadcasting satellite can be always captured in the best condition, and the high-quality TV broadcasting can be received.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a BS antenna automatic tracking control unit.

[FIG. 3] Steering angle θ ′ (t) of vehicle body, speed v
The figure which shows the relationship between (t) and the direction change amount (theta).

FIG. 4 is a flowchart for explaining the operation of the embodiment.

FIG. 5 is a diagram showing an example of a television receiver equipped with a conventional automatic tracking BS antenna.

FIG. 6 is a flowchart for explaining the operation of the television receiver.

[Explanation of symbols]

11 ... Television receiver main body, 12 ... BS antenna automatic tracking control unit, 21 ... Terrestrial tuner, 22 ... BS tuner,
231 ... Terrestrial antenna, 23 ... Switching device, 24 ... T
V linear circuit, 25 ... voice circuit, 26 ... speaker, 27
... Chroma circuit, 28 ... Cycle separation circuit, 29 ... Control circuit,
30 ... Timing control circuit, 311 ... Key input section, 31
0 ... A / D conversion circuit, 32 ... Segment driver, 33
... common driver, 34 ... LC panel, 41 ... antenna stand, 42 ... BS antenna, 43 ... motor, 44 ... controller, 45 ... electric field level detection circuit, 46 ... steering angle detection circuit, 47 ... vehicle speed detection circuit, 48 ... motor Drive circuit.

Claims (1)

[Claims] 1. A television receiver main body mounted on a mobile body, a BS antenna connected to the television receiver main body, an antenna base rotatably supporting the BS antenna, and a steering angle of the mobile body. Steering angle detecting means for detecting and speed detecting means for detecting the moving speed of the moving body, and an azimuth change amount is obtained from the steering angle detected by the steering angle detecting means and the moving speed detected by the speed detecting means. A television receiver comprising: control means for rotating the BS antenna by the antenna change amount in the direction opposite to the rotation direction according to the azimuth change amount of the moving body.