JPH10206473A - Satellite broadcast signal strength meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate adjustment of an antenna direction by providing function for identifying radio wave reception from a digital broadcasting satellite. SOLUTION: A signal received by an antenna and converted by a down- converter is input from a terminal 1 into a tuner 2, dialed, converted into an intermediate frequency signal, and amplified in an IF amplification part 3. A signal from the IF amplification part is detected by a wave detection part 4, amplified in a level conversion part 5 and applied to a level meter 6 to cause an indicator to swing according to radio wave strength. In the case of a digitally modulated wave, an orthogonally modulated signal from the IF amplification part is input to an I/Q demodulation part 7 for demodulating I-axis components and Q-axis components, and is converted into a digital signal in an A/D- conversion part 8. Video and audio signals or the like are demodulated in a QPSK demodulation part 9, and a signal output from the QPSK demodulation part 9 is applied via a level conversion part 10 to a display part 11 (such as LED), wherein the display part is lit in the case of digital broadcasting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcast signal strength meter device, which identifies reception of satellite digital broadcast waves,
The present invention relates to an apparatus for easily adjusting the direction of an antenna.

[0002]

2. Description of the Related Art When a receiving antenna for a satellite broadcast or the like is installed, the antenna is directed in the direction of the satellite with reference to the pointer of a compass, and the intensity of the received signal is measured by a level meter or the like of a satellite broadcast receiving device. Make fine adjustments while checking, and correctly adjust the antenna direction to the satellite direction. For this reason, as shown in FIG. 4, a receiver for satellite broadcasting receives a signal received by an antenna, is frequency-converted by a down-converter, selects a signal input from a terminal 1 by a tuner 2, and outputs an intermediate signal by an IF amplifier 3. The signal is amplified in frequency, the output signal of the IF amplifier 3 is detected by the detector 4, and this signal is applied to the level meter 6 via the level converter 5, and the direction of the antenna is adjusted while observing the swing of the pointer. ing. However, when a large number of satellites are arranged close to each other, there may be a case where an adjustment is made by erroneously recognizing that the signal is from a satellite to receive radio waves from an unintended satellite.

[0003]

The satellite broadcasting includes a satellite digital broadcasting which has recently started in addition to the analog broadcasting. The present invention pays attention to this point, and makes it possible to distinguish whether a received radio wave is from a satellite for analog broadcasting or a satellite for digital broadcasting, and to easily adjust the direction of the antenna.

[0004]

According to the present invention, there is provided a tuner for selecting and receiving a satellite broadcast, an IF amplifier for amplifying an intermediate frequency signal from the tuner,
A detection unit for detecting an output signal of the F amplification unit, a first display unit for displaying according to a signal level from the detection unit, a digital signal demodulation unit for demodulating a digitally modulated signal from the IF amplification unit, A second display for displaying based on a signal from a digital signal demodulator, and a satellite broadcast signal strength meter device for adjusting the direction of an antenna based on the display on the first display and the second display. To provide.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a satellite broadcast signal strength meter according to the present invention, a satellite broadcast is selected and received by a tuner, an intermediate frequency signal from the tuner is amplified by an IF amplifier, and an output signal of the IF amplifier is output. The detection is performed by the detection unit, the pointer of the level meter is moved according to the signal level from the detection unit, and the I- and Q-axis components are demodulated by the I / Q demodulation unit from the quadrature modulated signal from the IF amplification unit. The demodulated signal is converted to a digital signal by an A / D converter and input to a QPSK demodulator,
The light emitting element is turned on based on the signal output from the QPSK demodulation unit. Thus, in the case of analog broadcasting reception, the direction of the antenna is adjusted so that the deflection of the pointer of the level meter becomes maximum, and in the case of satellite digital broadcasting reception, the light emitting element is turned on, and the pointer of the level meter is turned on. Adjust the direction of the antenna to maximize the deflection.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a satellite broadcast signal strength meter according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram of a main part of an embodiment of a satellite broadcast signal strength meter device according to the present invention. In the figure, reference numeral 1 denotes an input terminal for inputting a satellite broadcast signal received by a parabolic antenna or the like and frequency-converted by a down converter. 2 is a tuner, terminal 1
To select and receive the satellite broadcast signal and convert the frequency to an intermediate frequency signal. An IF amplifier 3 amplifies the intermediate frequency signal from the tuner 2. Reference numeral 4 denotes a detection unit that detects a signal from the IF amplification unit 3. Reference numeral 5 denotes a level converter, which converts (amplifies) the signal from the detector 4 into a signal level suitable for driving the level meter (first display unit) 6. The level meter 6 indicates a scale corresponding to the signal level from the level converter 5. Reference numeral 7 denotes an I / Q demodulation unit that demodulates the I-axis component and the Q-axis component of the orthogonally-modulated signal from the IF amplification unit 3. Reference numeral 8 denotes an A / D converter, which converts a signal from the I / Q demodulator 7 into a digital signal. 9 is QPSK (Quadrature Phase S)
hift Keying) The demodulator (quadrature modulation signal demodulator)
The orthogonal modulation signal from the D conversion unit 8 is demodulated. Reference numeral 10 denotes a level converter, which converts (amplifies) the signal level for turning on the display unit 11 when the output signal of the QPSK demodulator 9 is at or above a required level. The display unit (second display unit) 11 includes a light emitting element, for example, an LED (light emitting diode), and is turned on by a signal from the level conversion unit 10.

FIG. 2 is a block diagram of a main part of another embodiment of the satellite broadcast signal strength meter apparatus according to the present invention. In FIG.
And the signal from the level conversion unit 10 are manually switched, or the signal from the level conversion unit 10 is switched to the level conversion unit 10 side. The other reference numerals are the same as those in FIG.

Next, the operation of the satellite broadcast signal strength meter according to the present invention will be described. In the case of FIG. 1, when the direction of the antenna is moved and a radio wave from a satellite is captured, a down-converted satellite broadcast signal is input from a terminal 1. This satellite broadcast signal is selected by the tuner 2 and converted into an intermediate frequency.
The signal is amplified by the IF amplifier 3. The output from the IF amplifier 3 is detected by the detector 4 and the signal level is amplified by the level converter 5 so that, for example, when the input signal reaches a required value, the pointer of the level meter 6 indicates a substantially maximum scale. I do. IF
Since the output of the amplification unit 3 increases in accordance with the increase of the input signal level of the antenna, when the pointer of the level meter 6 (an example is shown in FIG. become. The level meter 6 moves its pointer according to the signal level whether the radio wave from the satellite is a digital broadcast signal or an analog broadcast signal.

When the radio wave from the satellite is a signal that has been digitally modulated (quadrature modulated), the signal from the IF amplifier 3
The / Q demodulation unit 7 demodulates the I-axis component and the Q-axis component.
The I-axis component and the Q-axis component are each converted into a digital signal by the A / D converter 8, and the QPSK demodulator 9 demodulates the video / audio signal. The demodulated output signal is converted (amplified) to a required signal level by a level conversion unit 10, and the display unit 11
To turn on an LED or the like (an example is shown in FIG. 3B). Thereby, when receiving an analog satellite broadcast, the direction of the antenna is adjusted so that the indication of the level meter 6 becomes maximum, and when receiving the satellite digital broadcast, the LE is adjusted.
The direction of the antenna may be adjusted so that D (display unit 11) is turned on and the indication of the level meter 6 is maximized.

In the above description, the pointer of the level meter 6 is moved by the signal from the level converter 5, but the level meter 6 is configured by arranging a plurality of LEDs and the like, The LED or the like corresponding to the level may be turned on according to the signal level, or the LEDs to be turned on may be sequentially switched according to the signal level, or
The level meter 6 may be constituted by a digital display element using a 7-segment LED or the like, and may be displayed numerically based on the signal level from the level converter 5.

In the case of FIG. 2, when a radio wave from a satellite is a signal that has been digitally modulated (quadrature modulated), the switch 21 includes a tuner 2, an IF amplifier 3, an I / Q demodulator 7, and an A / D converter 8. , Is switched to the D side by a signal output through the QPSK demodulation unit 9 and the level conversion unit 10, and the signal from the level conversion unit 10 is applied to the display unit 11 and the level meter 6,
At the same time as turning on the LED of the display unit 11, the scale of the level meter 6 is instructed according to the signal level. When the radio wave from the satellite is an analog broadcast signal, the signal is not output from the level converter 10, so the switch 21 is switched to the A side, and indicates the scale of the level meter 6 according to the signal level from the level converter 5. Alternatively, the switch 21 is manually switched, and is switched to the A side when receiving an analog broadcast, and to the D side when receiving a digital broadcast.
When switching to the D side, the level meter 6 does not swing when digital broadcasting is received, and when switching to the D side, the level meter 6 does not swing when analog broadcasting is received. To avoid misunderstanding.

[0012]

As described above, according to the satellite broadcast signal strength meter device of the present invention, when a radio wave from a digital broadcast satellite is received, an LED or the like is turned on. It can be distinguished from satellites or digital broadcasting satellites, and is useful for preventing misalignment of the antenna orientation.

[Brief description of the drawings]

FIG. 1 is a block diagram of a main part of an embodiment of a satellite broadcast signal strength meter device according to the present invention.

FIG. 2 is a main part block diagram of another embodiment of the satellite broadcast signal strength meter device according to the present invention.

FIG. 3 is an example of a level meter and a display unit (LED).

FIG. 4 is a main block diagram of an example of a conventional satellite broadcast signal strength meter device.

[Description of Signs] 2 Tuner 3 IF amplifying unit 4 Detecting unit 5, 10 Level converting unit 6 Level meter 7 I / Q demodulating unit 8 A / D converting unit 9 QPSK demodulating unit 11 Display unit (LED) 21 Switch

Claims (7)

[Claims] A tuner for selecting and receiving a satellite broadcast;
An IF amplifier for amplifying the intermediate frequency signal from the tuner,
A detecting unit for detecting an output signal of the IF amplifying unit, a first display unit for displaying according to a signal level from the detecting unit,
A digital signal demodulation section for demodulating the digitally modulated signal from the amplification section; and a second display section for displaying based on the signal from the digital signal demodulation section, and displaying the first and second display sections. A satellite broadcast signal strength meter device that adjusts the direction of the antenna based on it. 2. An I / Q demodulation section for demodulating an I-axis component and a Q-axis component of a quadrature modulation signal from an IF amplification section, and a digital signal demodulation section for converting a signal from the I / Q demodulation section into a digital signal. 3. The satellite broadcast signal strength meter device according to claim 2, comprising: an A / D converter for converting the signal into a signal; and a quadrature modulation signal demodulator for demodulating a video signal or the like from the I-axis component and the Q-axis component from the A / D converter. . 3. The satellite broadcast signal strength meter device according to claim 1, wherein said first display unit comprises a level meter for indicating a scale corresponding to a signal level from a detection unit. 4. The satellite broadcast signal strength meter device according to claim 1, wherein said first display unit comprises a digital display element for displaying a numerical value corresponding to a signal level from a detection unit. 5. The light-emitting device according to claim 1, wherein the first display unit includes a plurality of light-emitting elements arranged therein, and responds to a signal level from the detection unit to turn on the light-emitting element corresponding to the level. Item 3. A satellite broadcast signal strength meter device according to item 2. 6. The second display unit includes a light emitting device,
3. The lighting device according to claim 1, wherein the lighting is performed at a required signal level of the demodulated output signal of the digital signal demodulating unit.
The satellite broadcast signal strength meter device according to claim 4 or 5. 7. A switch for switching between a signal from the detection unit and a signal from a digital signal demodulation unit and inputting the signal to a first display unit, and a digital signal demodulation unit when receiving a radio wave from a satellite of digital broadcasting. 1, 2, 3, 4, 5
7. A satellite broadcast signal strength meter according to claim 6.