JP2002246930A - Digital broadcasting receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the generation of reduction in reception quality, at the time of mobile reception in a digital broadcasting receiver for receiving digital broadcasting waves. SOLUTION: A receiver comprises a plurality of antennas, a plurality of tuners for selecting digital broadcasting waves, a plurality of demodulators for demodulating the selected broadcasting waves, a plurality of reception quality detectors, a determination part for determining superiority of the reception quality from a plurality of outputs of the reception quality detector, a selecter for selecting one from the outputs of a plurality of front end by a determination output of the determination part, and a control unit for controlling the plurality of demodulators and the plurality of tuners. One digital broadcasting wave is demodulated by the plurality of front ends, and the best demodulation signal can be selected by the selecter, based on the reception quality detected by the reception quality detector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiving apparatus for receiving a digital broadcast.

[0002]

2. Description of the Related Art In recent years, in place of conventional analog broadcasting,
Digital broadcasting via terrestrial, satellite, and cable has appeared.

[0003] A digital receiver for receiving a digital broadcast will be described with reference to the drawings. FIG. 5 is a block diagram showing a configuration of a conventional digital broadcast receiving apparatus.
In the figure, an antenna 51, a tuner 52, a demodulation unit 5
3, a transport decoding unit 54, an MPEG decoding and DA conversion unit 55, a control unit 56, and a control line 57.

Next, the operation of the conventional example will be described. The digital broadcast signal is received by the antenna 51 and the tuner 5
2, the demodulation unit 53 demodulates the selected modulation signal and performs error correction processing. Then, the signal multiplexed by the MPEG system is separated by the transport decoding unit 54, and the digital signal of the necessary channel is decoded by the MPEG decoding and D / A conversion unit 55 and output as an analog signal. Each part is controlled by a control line 57 from a control unit 56.
Done through.

[0005]

However, with the above arrangement, in a digital broadcast receiving apparatus for receiving a digital broadcast wave, during mobile reception, the reception quality is reduced due to a change in the direction of arrival of the received radio wave, and MPEG decoding is performed. Video and audio are disturbed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a digital broadcast receiving apparatus and a broadcast receiving apparatus which can solve the above-mentioned problem and can reduce the occurrence of deterioration in reception quality during mobile reception.

[0007]

In order to achieve this object, a digital broadcast receiving apparatus according to claim 1 selects a digital broadcast wave by inputting a plurality of antennas and signals received by the plurality of antennas. With multiple tuners to
A plurality of demodulators for demodulating the respective broadcast waves selected by the plurality of tuners; a plurality of reception quality detectors for detecting the quality of the received radio waves received; and respective reception qualities from outputs of the plurality of reception quality detectors. A plurality of tuners, and a control unit that controls a plurality of tuners and a plurality of demodulation units, and a control unit that controls a plurality of tuners and a plurality of demodulation units. It is characterized by selecting a reception quality.

[0008] According to a second aspect of the present invention, there is provided a digital broadcast receiving apparatus.
In the configuration of the digital broadcast receiving apparatus according to claim 1,
A control unit that controls a plurality of tuners and a plurality of demodulation units determines respective reception qualities from outputs of the plurality of reception quality detection units.

[0009] According to a third aspect of the present invention, there is provided a digital broadcast receiving apparatus.
In the configuration of the digital broadcast receiving apparatus according to claim 1,
The reception quality detection of the reception quality detection unit is performed based on one or both of a reception electric field strength detected by the tuner and an error rate detected by the demodulation unit.

[0010] According to a fourth aspect of the present invention, there is provided a digital broadcast receiving apparatus.
In the configuration of the digital broadcast receiving apparatus according to claim 3,
The reception quality detection of the reception quality detection unit is performed based on one or both of a reception electric field strength detected by the tuner and an error rate detected by the demodulation unit.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION
A plurality of antennas, a plurality of tuners for inputting signals received by the plurality of antennas to select digital broadcast waves, and a plurality of demodulation units for demodulating the respective broadcast waves selected by the plurality of tuners, A plurality of reception quality detection units for detecting the quality of received radio waves, a determination unit for determining a system of the best reception quality from the outputs of the plurality of reception quality detection units, and a single signal from the outputs of the plurality of front end units A selecting section for selecting, a control section for controlling a plurality of tuners and a plurality of demodulating sections, wherein selecting a signal having the best reception quality among a plurality of demodulated signals, By selecting the one with the best reception quality among the above, the effect of reducing the occurrence of the deterioration of the reception quality is obtained.

[0012] According to a second aspect of the present invention, there is provided a digital broadcast receiving apparatus.
In the configuration of the digital broadcast receiving apparatus according to claim 1,
The control unit controls the plurality of tuners and the plurality of demodulation units, and outputs a control signal to the selection unit by judging each reception quality from the outputs of the plurality of reception quality detection units, Circuit size can be reduced.

[0013] According to a third aspect of the present invention, there is provided a digital broadcast receiving apparatus.
In the configuration of the digital broadcast receiving apparatus according to claim 1,
The reception quality detection of the reception quality detection unit is performed by using one or both of the reception electric field strength detected by the tuner and the error rate detected by the demodulation unit. Can be reduced.

[0014] According to a fourth aspect of the present invention, there is provided a digital broadcast receiving apparatus.
In the configuration of the digital broadcast receiving apparatus according to claim 3,
The control unit controls the plurality of tuners and the plurality of demodulation units, and outputs a control signal to the selection unit by determining each reception quality from the outputs of the plurality of reception quality detection units, Further, the circuit scale can be reduced. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 shows a first embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a first antenna, 2 denotes a first tuner, 3 denotes a first demodulator, 4 denotes a first reception quality detector, and 5 denotes a second antenna. antenna,
6 is a second tuner, 7 is a second demodulator, 8 is a second reception quality detector, 9 is a third antenna, 10 is a third tuner, 11 is a third demodulator, and 12 is a second demodulator. Three reception quality detection units, 13 is a selection unit, 14 is a determination unit, 15 is a control unit,
54 is a transport decoder, 55 is MPEG, D
/ A conversion unit.

A digital broadcast wave received by each antenna is selected by a first tuner 2, a second tuner 6, and a third tuner 10 in accordance with a control signal from a control unit 15, and the next broadcast wave is selected. The signal is demodulated by the first demodulator 3, the second demodulator 7, and the third demodulator 11. Then, a transport stream is output from each demodulation unit as an input to the selection unit 13. The digital broadcast wave received by each antenna is detected by the first reception quality detection unit 4, the second reception quality detection unit 8, and the third reception quality detection unit 12, respectively.

The outputs of these detectors are input to a determination unit 14, which determines the reception quality of the three antennas, determines the best detection output among the three, and demodulates the demodulation unit corresponding to this detection output. A control signal is sent to the selection unit 13 to select an output. The selector 13 selects one of the three demodulated outputs according to the control signal and outputs the selected one. The signal multiplexed by the selected MPEG system is separated by the transport decoding unit 54, and the digital signal of the required channel is decoded by the MPEG decoder and the D / A conversion unit 55, and each is output as an analog signal.

As described above, by selecting a signal having the best reception quality among a plurality of demodulated signals, it is possible to reduce the occurrence of a decrease in reception quality.

(Embodiment 2) FIG. 2 shows a second embodiment of the present invention.
FIG. 2 shows a configuration in one embodiment, wherein 1 is a first antenna, 2 is a first tuner, 3 is a first demodulation unit, 4 is a first reception quality detection unit, and 5 is a second reception quality detection unit. antenna,
6 is a second tuner, 7 is a second demodulator, 8 is a second reception quality detector, 9 is a third antenna, 10 is a third tuner, 11 is a third demodulator, and 12 is a second demodulator. Three reception quality detection units, 13 is a selection unit, 17 is a control unit, 54 is a transport decoding unit, and 55 is an MPEG / D / A conversion unit.

The digital broadcast wave received by each antenna is selected by the first tuner 2, the second tuner 6, and the third tuner 10 according to the control signal from the control unit 15, and then the broadcast wave is selected. The signal is demodulated by the first demodulator 3, the second demodulator 7, and the third demodulator 11. Then, a transport stream is output from each demodulation unit as an input to the selection unit 13.

The digital broadcast wave received by each antenna is detected by the first reception quality detection unit 4, the second reception quality detection unit 8, and the third reception quality detection unit 12, respectively. . The outputs of these detection units are input to the control unit 17 to determine the reception quality of the three antennas, determine the best detection output among the three, and select the demodulation output of the demodulation unit corresponding to this detection output. Control line 5 to the selector 13
7 to send a control signal. The selector 13 selects one of the three demodulated outputs according to the control signal and outputs the selected one.

The signal multiplexed by the selected MPEG system is separated by the transport decoding unit 54, and the digital signal of the required channel is decoded by the MPEG decoder and the D / A conversion unit 55, and each is converted into an analog signal. Output. As described above, by inputting the detection signal detected by the reception quality detection unit to the control unit, the control unit determines the best reception quality among the plurality of demodulated signals, and controls the selection unit. In addition, it is possible to reduce the occurrence of a decrease in reception quality and to reduce the circuit scale.

FIG. 3 shows the structure of a third embodiment of the present invention. In FIG.
Is the first tuner, 3 is the first demodulator, 5 is the second antenna, 6 is the second tuner, 7 is the second demodulator, 9
Is a third antenna, 10 is a third tuner, 11 is a third demodulator, 13 is a selector, 15 is a controller, 16 is a determiner, 54 is a transport decoder, and 55 is an MPE.
G, D / A conversion unit.

The digital broadcast wave received by each antenna is selected by the first tuner 2, the second tuner 6, and the third tuner 10 by a control signal from the control unit 15, and then the broadcast wave is selected. The signal is demodulated by the first demodulator 3, the second demodulator 7, and the third demodulator 11. Then, a transport stream is output from each demodulation unit as an input to the selection unit 13. In the first tuner 2, the second tuner 6, and the third tuner 10, the reception electric field of the selected broadcast wave is detected, and the first demodulator 3, the second demodulator 7, the third demodulator 7, The unit 11 detects an error rate of the demodulated signal.

These detection outputs are input to the determination unit 16,
The reception quality at the three antennas is determined, the best detection output among the three is determined, and a control signal is sent to the selection unit 13 to select the demodulation output of the demodulation unit corresponding to the detection output. The selector 13 selects one of the three demodulated outputs according to the control signal and outputs the selected one. This selected M
A signal multiplexed by the PEG system is separated by a transport decoding unit 54, and a digital signal of a necessary channel is decoded by an MPEG decoder and a D / A conversion unit 55, and each is output as an analog signal.

As described above, the reception quality detection of the reception quality detection unit is performed based on one or both of the reception electric field strength detected by the tuner and the error rate detected by the demodulation unit. It is possible to configure the function of the reception quality detection unit without increasing the circuit scale, determine the best reception quality among a plurality of demodulated signals, and control the selection unit to reduce the reception quality. It is possible to reduce the occurrence.

FIG. 4 shows the structure of a fourth embodiment of the present invention. In FIG.
Is the first tuner, 3 is the first demodulator, 5 is the second antenna, 6 is the second tuner, 7 is the second demodulator, 9
Is a third antenna, 10 is a third tuner, 11 is a third demodulator, 13 is a selector, 17 is a controller, 54 is a transport decoder, and 55 is an MPEG / D / A converter.

The digital broadcast wave received by each antenna is selected by a first tuner 2, a second tuner 6, and a third tuner 10 according to a control signal from the control unit 17, and the next broadcast wave is selected. The signal is demodulated by the first demodulator 3, the second demodulator 7, and the third demodulator 11. Then, a transport stream is output from each demodulation unit as an input to the selection unit 13. In the first tuner 2, the second tuner 6, and the third tuner 10, the reception electric field of the selected broadcast wave is detected, and the first demodulator 3, the second demodulator 7, the third demodulator 7, The unit 11 detects an error rate of the demodulated signal.

These detection outputs are input to the control unit 17,
The reception quality at the three antennas is determined, the best detection output among the three antennas is determined, and the control line 57 is sent to the selection unit 13 to select the demodulation output of the demodulation unit corresponding to this detection output.
Via the control signal.

The selector 13 selects one of the three demodulated outputs according to the control signal and outputs it. The signal multiplexed by the selected MPEG system is separated by the transport decoding unit 54, and a digital signal of a necessary channel is converted into an MPEG decoder and a D / A conversion unit 55.
And output them as analog signals.

As described above, the reception quality detection of the reception quality detection section is performed by using one or both of the reception field strength detected by the tuner and the error rate detected by the demodulation section. It is possible to configure the function of the reception quality detection unit without increasing the circuit scale, determine the best reception quality among a plurality of demodulated signals, and control the selection unit to reduce the reception quality. It is possible to reduce the occurrence.

[0032]

As described above, according to the present invention, it is possible to provide a digital broadcast receiving apparatus and a broadcast receiving apparatus which can reduce the occurrence of a decrease in reception quality during mobile reception.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of the invention according to claim 1 of the present invention.

FIG. 2 is a block diagram showing the configuration of the invention according to claim 2 of the present invention;

FIG. 3 is a block diagram showing a configuration of the invention according to claim 3 of the present invention.

FIG. 4 is a block diagram showing the configuration of the invention according to claim 4 of the present invention.

FIG. 5 is a block diagram showing a conventional configuration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st antenna 2 1st tuner 3 1st demodulation part 4 1st reception quality detection part 5 2nd input 6 2nd tuner 7 2nd demodulation part 8 2nd reception quality detection part 9th Third antenna 10 Third tuner 11 Third demodulation unit 12 Third reception quality detection unit 13 Selection unit 14 Judgment unit 15 Control unit 16 Judgment unit 17 Control unit 51 Antenna 52 Tuner 53 Demodulation unit 54 Transport decoding unit 55 MPEG decoding, D / A conversion unit 56 Control unit 57 Control line 58 Output terminal

Claims (4)

[Claims] 1. A digital broadcast receiving apparatus, comprising: a plurality of antennas; and a plurality of tuners each of which receives a signal received by the antenna and selects a digital broadcast wave.
A plurality of demodulators for demodulating the respective broadcast waves selected by the tuner; a plurality of reception quality detectors for detecting the quality of the received radio wave received; and a plurality of reception qualities from a plurality of outputs of the reception quality detector. And a control unit that controls a plurality of tuners and a plurality of demodulation units, wherein the selection unit determines by the determination unit. A digital broadcast receiving apparatus, wherein one of a plurality of demodulated signals is selected based on a result obtained. 2. The digital broadcast receiving apparatus according to claim 1, wherein the control unit receives a plurality of outputs of the reception quality detection unit as inputs and determines each reception quality. 3. The reception quality detection of the reception quality detection unit,
2. The digital broadcast receiving apparatus according to claim 1, wherein the reception is performed at one or both of a reception electric field intensity detected by the tuner and an error rate detected by the demodulation unit. 4. The digital broadcast receiving apparatus according to claim 3, wherein the control unit receives a plurality of outputs of the reception quality detection unit as inputs and determines each reception quality.