JP4338588B2 - Broadcast receiver - Google Patents

Description

The present invention relates to a broadcast receiving apparatus, and more particularly to a broadcast receiving apparatus that receives broadcast radio waves such as television broadcasts and radio broadcasts.

Conventional broadcast receivers such as television broadcasts and FM radio broadcasts have a type that receives broadcast radio waves while appropriately switching a plurality of antennas in order to cope with changes in the state of received radio waves during movement ( For example, see Patent Document 1 below). However, in such a broadcast receiving apparatus, when the sound is interrupted at the moment when the antenna is switched or the antenna is switched in a preset order, the reception state of the antenna after switching is deteriorated. In some cases, when the antenna is frequently switched, there is a problem that the output video signal or audio signal is disturbed, that is, noise is likely to occur.

For example, Patent Document 2 listed below discloses a broadcast receiving apparatus that is intended to reduce such deterioration in reception quality during movement. FIG. 15 is a block diagram schematically showing the main part of the digital broadcast receiving apparatus described in Patent Document 2. In FIG.

The digital broadcast receiver 50 includes first to third antennas 51, 55, 59, first to third.
Tuners 52, 56, 60, first to third demodulation units 53, 57, 61, first to third reception quality detection units 54, 58, 62, selection unit 63, determination unit 64, control unit 65, A transport decoding unit 66 and an MPEG decoding / D / A conversion unit 67 are included.

The digital broadcast wave received by the first to third antennas 51, 55, 59 is transmitted to the control unit 65.
Broadcast waves are selected by the first to third tuners 52, 56, and 60, respectively, and then demodulated by the first to third demodulation units 53, 57, and 61, respectively. A transport stream is output from each demodulator to the selector 63. In addition, the reception quality of the digital broadcast wave received by each antenna is detected by the first to third reception quality detection units 54, 58 and 62.

The outputs of the first to third reception quality detection units 54, 58 and 62 are input to the determination unit 64. The determination unit 64 determines the reception quality of the three antennas and obtains the best detection output among the three. Judgment,
A control signal is sent to the selector 63 so as to select the demodulated output of the demodulator corresponding to the detected output.

The selector 63 selects one of the three demodulated outputs based on this control signal. The signals multiplexed in the selected MPEG system are separated by the transport decoding unit 66, and the digital signals of the necessary channels are decoded by the MPEG decoder and the D / A conversion unit 67 and output as analog signals, respectively. . Therefore, the digital broadcast receiving apparatus 50 can reduce the occurrence of a decrease in reception quality by selecting a signal having the best reception quality from among a plurality of demodulated signals.

However, in the digital broadcast receiving apparatus 50 described in Patent Document 2, the selection unit 63 selects and outputs one of the demodulated outputs from each demodulating unit. However, there was a problem that instantaneous signal disturbance occurred.
JP-A-8-107378 JP 2002-246930 A

Means for solving the problems and their effects

The present invention has been made in view of the above problems, and can eliminate disturbance of an output signal due to antenna switching, selection of a signal from a receiver, and the like, and reduce a noise level included in the output signal. An object of the present invention is to provide a broadcast receiving apparatus that can output a high-quality signal.

In order to achieve the above object, a broadcast receiving apparatus ( 1 ) according to the present invention includes a plurality of antennas that receive broadcast radio waves, and a plurality of reception means that respectively extract signal components from the broadcast radio waves received by these antennas, A reception state detection unit that detects a reception state of each broadcast radio wave, a storage unit that stores each signal component extracted from each broadcast radio wave by the plurality of reception units, and a detection signal from the reception state detection unit Based on the determination result, the reception quality of each broadcast radio wave is determined at a predetermined timing, and based on the determination result, a signal that meets a predetermined condition is read out from each signal stored in the storage means and the read A control means for performing signal processing control corresponding to the control, and generating an output signal based on the signal sent from the storage means based on the signal processing control by the control means. Includes a processing and signal processing means for which the control means is read to read the best signal reception quality from among the signals stored in the storage means, and a number of signals which the reception quality is poor Control and signal processing control for detecting a noise component included in the signal having the poorer reception quality and generating an output signal from which the noise component included in the signal having the highest reception quality is removed using the noise component And the signal processing means detects a noise component contained in the signal with the lower reception quality sent from the storage means based on the signal processing control by the control means, It is characterized in that a process for generating an output signal is performed based on a signal from which a noise component included in the signal having the best reception quality is removed using a noise component.

According to the broadcast receiving apparatus ( 1 ), the signal having the best reception quality and some signals having the poor reception quality are read out from the signals stored in the storage means, and the signal processing is performed. Means detects a noise component contained in the signal having the lower reception quality sent from the storage means, and using the noise component, the noise component contained in the signal having the best reception quality is removed. An output signal is generated based on the signal. Therefore, the output signal generated based on the signal from which the noise component included in the signal having the best reception quality is removed is output without interruption, and the switching of the antenna and the selection of the receiving means are broadcasted as in the past. It is no longer necessary to execute according to changes in the reception state of radio waves, and it is possible to eliminate momentary disturbance of the output signal due to switching of these antennas and selection of reception means, even when the reception state of broadcast waves changes frequently. In addition to being able to stably output a signal without disturbance, the quality of the output signal can be further improved by removing a noise component contained in the signal having the best reception quality.

The broadcast receiving apparatus ( 2 ) according to the present invention includes a plurality of antennas for receiving broadcast radio waves, a plurality of receiving means for extracting signal components from the respective broadcast radio waves received by these antennas, and reception of the respective broadcast radio waves. On the basis of a detection signal from the reception state detection means, a storage means for storing each signal component extracted from each broadcast radio wave by the plurality of reception means, and a detection signal from the reception state detection means Readout control for determining radio wave reception quality at a predetermined timing, and reading out a signal that meets a predetermined condition from each signal stored in the storage means based on the determination result, and signal processing corresponding to the readout control A control unit for performing control, and a signal for performing processing for generating an output signal based on a signal sent from the storage unit based on signal processing control by the control unit And a management unit, said control means, and read control of the reception quality reception quality with a predetermined level or more signals from among the signals stored in said storage means reads the signal below a predetermined level, the reception quality Detects a noise component included in a signal of less than a predetermined level, adds and averages signals having a reception quality equal to or higher than a predetermined level, and uses the noise component to remove a noise component included in the addition averaged signal Signal processing control for generating an output signal, and the signal processing means converts the reception quality sent from the storage means to a signal less than a predetermined level based on the signal processing control by the control means. The noise component included is detected, the signal having the reception quality equal to or higher than a predetermined level is added and averaged, and the noise component included in the signal subjected to the addition average using the noise component is removed. It is characterized in that a process for generating an output signal is performed based on the left signal.

According to the broadcast receiving apparatus ( 2 ), a signal having a reception quality equal to or higher than a predetermined level and a signal having a reception quality lower than the predetermined level are read from each signal stored in the storage means, and the signal processing means The noise component included in the signal having the reception quality less than the predetermined level sent from the storage means is detected, the signal having the reception quality of the predetermined level or more is added and averaged, and the noise component is used to An output signal is generated based on the signal from which the noise component contained in the signal subjected to the addition averaging is removed. Therefore, the output signal generated based on the signal from which the noise component contained in the signal obtained by the averaging is removed is output without interruption, and the switching of the antenna and the selection of the receiving means can be performed as in the past. It is no longer necessary to execute according to the change in the reception state, and it is possible to eliminate the momentary disturbance of the output signal due to the switching of the antenna and the selection of the reception means, and even when the reception state of the broadcast wave changes frequently, A signal without disturbance can be output stably. Further, the noise level included in the averaged signal can be reduced by averaging the signals having the reception quality equal to or higher than a predetermined level.

Embodiments of a broadcast receiving apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram schematically showing a main part of a broadcast receiving apparatus according to Embodiment (1).
The broadcast receiving apparatus 10 includes a first receiving unit 12 connected to the first antenna 11, a second receiving unit 14 connected to the second antenna 13, and a third receiving unit connected to the third antenna 15. The receiving unit 16 includes a fourth receiving unit 18 connected to the fourth antenna 17, a receiving state detecting unit 19, a storage unit 20, a signal processing unit 21, and a control unit 22.

The first to fourth receivers 12, 14, 16, and 18 take out signals from the broadcast waves received by the respective antennas, that is, select (tune) the broadcast waves of the target frequency from the broadcast waves. The demodulating process includes a tuner unit, an intermediate frequency amplifying unit, a detecting unit (not shown), and the signals demodulated by these receiving units are respectively stored in the storage unit 20. Is output. The first to fourth receiving units 12, 14, 16, 1
For example, a receiver that receives a television broadcast wave, a receiver that receives a radio broadcast wave, or the like is employed.

The storage unit 20 temporarily stores each signal demodulated by the first to fourth receiving units 12, 14, 16, and 18, and a storage device such as a hard disk or a semiconductor memory is employed. Based on a read control signal from the control unit 22, a signal used for subsequent signal processing is read and output to the signal processing unit 21. The signal processing unit 21 generates an output signal based on the signal sent from the storage unit 20 based on the signal processing control signal from the control unit 22, that is, joins the signals in predetermined time units sent. Output processing, and includes an arithmetic processing circuit.

The first to fourth receivers 12, 14, 16, 18 are connected to a reception state detection unit 19, and the reception state detection unit 19 is a state of a broadcast wave received by each antenna, for example, The received electric field intensity, noise components such as multipath, and / or S / N ratio are detected, and the detection signal detected by the reception state detection unit 19 is output to the control unit 22. Yes. The reception state detection unit 19 may be included in each reception unit.

The control unit 22 controls each of the first to fourth reception units 12, 14, 16, 18, the storage unit 20, and the signal processing unit 21. The control unit 22 includes a microcomputer and includes a reception state detection unit. A function for determining the reception quality of the broadcast radio wave at each receiving unit based on the detection signal from 19 and the reception quality from among the demodulated signals of each receiving unit stored in the storage unit 20 based on the determination result A reading control function for reading the best demodulated signal and a signal processing control function for causing the signal processing unit 21 to generate an output signal based on the demodulated signal having the best reception quality are provided.

FIG. 2 is a diagram for explaining a signal processing method performed by the broadcast receiving apparatus 10 according to the embodiment (1). FIG. 2A shows each demodulated signal stored in the storage unit 20 and the control unit. 22 shows the reception quality level of the broadcast radio wave determined every predetermined time, and FIG. 2B is a diagram schematically showing the signal processed by the signal processing unit 21. The mark A in the figure indicates noise included in the demodulated signal.

As shown in FIG. 2A, the storage unit 20 stores the demodulated signal from each receiving unit, and the control unit 22 broadcasts radio waves at each receiving unit every predetermined time t. The reception quality level is determined. In this case, the reception quality is determined in five stages, and level 5 indicates that the reception quality is the best. The demodulated signal extracted from the broadcast radio wave having the best reception quality is sent to the signal processing unit 21 at every predetermined time t.

As shown in FIG. 2B, the signal processing unit 21 performs processing for generating an output signal by connecting demodulated signals having the best reception quality determined every predetermined time t transmitted from the storage unit 20. To be done. In addition, when a plurality of broadcast radio waves having the best reception quality are detected in each unit time t, a demodulated signal extracted from one of the broadcast radio waves based on a preset selection criterion (default setting) is used. It has become so.

Next, processing operations performed by the control unit 22 in the broadcast receiving apparatus 10 according to the embodiment (1) will be described based on the flowchart shown in FIG. This processing operation is executed every predetermined time when a broadcast radio wave is received.

First, in step S1, a process of acquiring a detection signal of a reception state (for example, reception electric field strength, noise level, or S / N ratio) of the broadcast radio wave in each reception unit from the reception state detection unit 19 is performed. Proceed to S2. In step S2, a process of determining the reception quality level of the broadcast radio wave in each reception unit is performed based on the acquired detection signal of the reception state of the broadcast radio wave in each reception unit, and then the process proceeds to step S3.

In step S3, the demodulated signal extracted from the broadcast radio wave having the highest reception quality level among the demodulated signals of each reception unit stored in the storage unit 20 based on the determined reception quality level of the broadcast radio wave at each reception unit. Control to read out the signal is performed, and then the process proceeds to step S4.

In step S4, the signal processing unit 21 is controlled to connect the demodulated signal having the highest reception quality level sent from the storage unit 20 to generate an output signal, and then the process returns to step S1 to repeat the processing.

According to the broadcast receiving apparatus 10 according to the embodiment (1), the first to fourth receiving units 12, 1
The signals demodulated by 4, 16, and 18 are stored in the storage unit 20, and based on the reading control by the control unit 22, the reception quality is the best among the demodulated signals of the respective reception units stored in the storage unit 20. The demodulated signal is read out in predetermined time units, and the signal processing unit 21 generates an output signal while connecting the demodulated signals having the best reception quality sent from the storage unit 20. Therefore, the output signal generated based on the demodulated signal having the best reception quality sent from the storage unit 20 will be output seamlessly, and switching between a plurality of antennas and selection of a plurality of receiving units as in the past. Is not required to be executed in real time, and the instantaneous disturbance of the output signal due to the switching of the antenna and selection of the receiver can be eliminated, and even if the state of the received radio wave changes frequently, the signal is not disturbed. Can be output stably. In addition, by using the demodulated signal having the best reception quality stored in the storage unit 20, it is possible to always reduce the noise component included in the output signal and reduce the noise level of the output signal. be able to.

Next, the broadcast receiving apparatus according to Embodiment (2) will be described. However, since the configuration of the broadcast receiving apparatus 10A according to the embodiment (2) is the same as the broadcast receiving apparatus 10 shown in FIG. 1 except for the signal processing unit and the control unit, it has different functions here. The signal processing unit 21A and the control unit 22A are assigned different reference numerals, and descriptions of other components are omitted.

The control unit 22A is configured to determine the reception quality of the broadcast radio wave in each reception unit based on the detection signal from the reception state detection unit 19, and to each reception unit stored in the storage unit 20 based on the determination result. A read control function for reading out some (for example, the upper two) demodulated signals having better reception quality from among the demodulated signals, and an output signal obtained by averaging the several demodulated signals having better reception quality And a signal processing control function for generating.

Based on the signal processing control signal from the control unit 22A, the signal processing unit 21A adds and averages some demodulated signals having better reception quality sent from the storage unit 20, and calculates the averaged signal. It has a function of performing a process of generating and outputting an output signal by connecting them together.

4A to 4C are diagrams for explaining a signal processing method in the broadcast receiving apparatus 10A according to Embodiment (2). In addition, the mark of A in the figure has shown the noise, and has shown the magnitude of the noise level with the magnitude | size.

As shown in FIG. 4 (a), the top two demodulated signals having a high reception quality level of the broadcast radio wave determined every predetermined time t are read out from the demodulated signals of each receiving unit stored in the storage unit 20. And
It is sent to the signal processing unit 21A. The upper two demodulated signals having a high reception quality level input to the signal processing unit 21A are added as shown in FIG. 4 (b) and then averaged as shown in FIG. 4 (c). And the process of generating the output signal by connecting the signals subjected to the averaging process is performed.

By adding the upper two demodulated signals having a high reception quality level, the level of the signal is doubled, but the level of noise occurring at different timings is not amplified. Therefore, by averaging the added signals in the subsequent averaging process, the noise component contained in the added signals is reduced (in this case, about 1/2), and the S / N ratio is improved. The Rukoto.

FIG. 5 is a flowchart showing processing operations performed by the control unit 22A in the broadcast receiving apparatus 10A according to the embodiment (2). This processing operation is executed every predetermined time when a broadcast radio wave is received. Further, this processing operation is the one in which steps S11 and S12 are inserted instead of steps S3 and S4 shown in FIG. 3, and only the differences will be described below.

In step S11, based on the determined reception quality level of the broadcast radio wave at each reception unit, it is extracted from the top two broadcast radio waves with the highest reception quality levels among the demodulation signals of each reception unit stored in the storage unit 20. The demodulated signal is read out, and then the process proceeds to step S12.

In step S12, the signal processing unit 21 is subjected to control for adding and averaging the upper two demodulated signals having a high reception quality level read from the storage unit 20, and connecting the added and averaged signals to generate an output signal. Then, return to step S1 and repeat the process.

According to the broadcast receiving apparatus 10A according to the above embodiment (2), the upper two demodulated signals with the higher reception quality levels are read out from the demodulated signals of the respective receiving units stored in the storage unit 20, and signal processing is performed. The unit 21A adds and averages the top two demodulated signals having high reception quality sent from the storage unit 20, and generates an output signal by connecting the signals subjected to the addition and averaging. Therefore, the output signal generated based on the addition-averaged signal is output without interruption, and the disturbance of the output signal can be eliminated. Even when the state of the received radio wave frequently changes, the disturbance It is possible to output a signal without any noise. Further, the noise level originally included in the demodulated signal can be reduced by the averaging, and the S / O of the output signal can be reduced.
The N ratio can be improved and the quality of the output signal can be improved.

Next, a broadcast receiving apparatus according to Embodiment (3) will be described. However, the configuration of the broadcast receiving apparatus 10B according to the embodiment (3) is the same as that of the broadcast receiving apparatus 10 shown in FIG. 1 except for the signal processing unit and the control unit, and therefore has different functions here. The signal processing unit 21 </ b> B and the control unit 22 </ b> B are assigned different reference numerals, and descriptions of other components are omitted.

The control unit 22B is configured to determine the reception quality of the broadcast radio wave in each reception unit based on the detection signal from the reception state detection unit 19, and each reception unit stored in the storage unit 20 based on the determination result. A read control function for reading out a demodulated signal having a reception quality of a predetermined level or higher from the demodulated signal, and a signal processing control function for generating an output signal by averaging the demodulated signals having a reception quality of the predetermined level or higher. Yes.

Based on the signal processing control signal from the control unit 22B, the signal processing unit 21B adds and averages the demodulated signals whose reception quality is greater than or equal to a predetermined level sent from the storage unit 20, and joins the signals subjected to the addition averaging. A function to generate and output an output signal.

6A to 6C are diagrams for explaining a signal processing method in the broadcast receiving device 10B according to Embodiment (3). In addition, the mark of A in the figure has shown the noise, and has shown the magnitude of the noise level with the magnitude | size.

As shown in FIG. 6A, a demodulated signal having a reception quality level determined at a predetermined time t from a demodulated signal of each receiving unit stored in the storage unit 20 at a predetermined level or higher (for example, level 4 or higher). (Demodulated signal) is sent to the signal processing unit 21B. When a demodulated signal of a predetermined level or higher is not included, the demodulated signal having the highest reception quality level (level 3, 2, 1) is read out and sent to the signal processing unit 21B. .

The demodulated signal whose reception quality level input to the signal processing unit 21B is equal to or higher than a predetermined level is subjected to addition processing as shown in FIG. 6B, and then averaged as shown in FIG. 6C. And the process of generating the output signal by connecting the signals subjected to the averaging process is performed.

By adding a demodulated signal having a reception quality level equal to or higher than a predetermined level, the signal level is amplified, but noise generated at different timings is not amplified. Therefore, by averaging the amplified signal in the subsequent averaging process, the noise component contained in the amplified signal is reduced (in this case, approximately 1/2), and the S / N ratio is improved. The Also,
By adding the demodulated signals whose reception quality level is equal to or higher than a predetermined level, the noise component contained in the demodulated signals to be added is reduced.

FIG. 7 is a flowchart showing processing operations performed by the control unit 22B in the broadcast receiving apparatus 10B according to the embodiment (3). This processing operation is executed every predetermined time when a broadcast radio wave is received. Further, the processing operation shown in FIG. 7 includes steps S21 to S25 inserted in place of steps S3 and S4 shown in FIG. 3, and only differences will be described below.

In step S21, it is determined whether or not a demodulated signal extracted from a broadcast radio wave having a reception quality level of a predetermined level or higher is included. If it is determined that a demodulated signal of a predetermined level or higher is included, the process proceeds to step S22. . In step S22, control is performed to read a demodulated signal having a reception quality level equal to or higher than a predetermined level from among demodulated signals stored in the storage unit 20, and then the process proceeds to step S23.

In step S23, the signal processing unit 21 adds and averages the demodulated signals having a reception quality level equal to or higher than a predetermined level sent from the storage unit 20, and joins the added and averaged signals to generate an output signal. Control is performed, and then the process returns to step S1. When there are not a plurality of demodulated signals having a reception quality level equal to or higher than a predetermined level, the demodulated signals are connected without generating an average and an output signal is generated.

On the other hand, if it is determined in step S21 that a demodulated signal of a predetermined level or higher is not included, the process proceeds to step S24. In step S24, control is performed to read out a demodulated signal extracted from the highest broadcast radio wave whose reception quality level is lower than a predetermined level.
Proceed to 25. In step S25, the signal processing unit 21 is controlled to connect the demodulated signal having the highest received quality level transmitted from the storage unit 20 below a predetermined level to generate an output signal, and then the step. Returning to S1, the process is repeated.

According to the broadcast receiving apparatus 10B according to the above embodiment (3), a demodulated signal having a reception quality of a predetermined level or more is read out from the demodulated signals of each receiving unit stored in the storage unit 20, and the signal processing unit 21B adds and averages the demodulated signals transmitted from the storage unit 20 and having the reception quality equal to or higher than a predetermined level, and joins the averaged signals to generate an output signal. Therefore, the output signal generated based on the signal obtained by the averaging is output without interruption, and the instantaneous disturbance of the demodulated signal to be output can be eliminated in substantially the same manner as the broadcast receiving apparatus 10 described above. Even when the state of the received radio wave frequently changes, a signal without disturbance can be output.

In addition, compared with the broadcast receiving apparatus 10A according to the above embodiment (2), the demodulated signals whose reception quality is equal to or higher than a predetermined level are added and averaged, so that the noise level included in the output signal can be kept low. It is possible to further improve the S / N ratio of the output signal and further improve the quality of the output signal.

Next, a broadcast receiving apparatus according to Embodiment (4) will be described. However, since the configuration of the broadcast receiving apparatus 10C according to the embodiment (4) is the same as the broadcast receiving apparatus 10 shown in FIG. 1 except for the signal processing unit and the control unit, it has different functions here. The signal processing unit 21C and the control unit 22C are denoted by different reference numerals, and description of other components is omitted.

Based on the detection signal from the reception state detection unit 19, the control unit 22C has a function of determining the reception quality of the broadcast radio wave at each reception unit, and a read control for reading out the demodulation signal of each reception unit stored in the storage unit 20. Function and weighting according to the reception quality of the demodulated signal that has been read (that is, the higher the reception quality level, the higher the amplification level during signal processing).
And a signal processing control function for generating an output signal by averaging the weighted signals.

The signal processing unit 21C performs weighting according to the reception quality of each demodulated signal transmitted from the storage unit 20 based on the signal processing control signal from the control unit 22C, and adds and averages the weighted signals. It has a function of performing processing for connecting the summed and averaged signals to generate an output signal.

FIGS. 8A to 8D are diagrams for explaining a signal processing method in the broadcast receiving apparatus 10C according to Embodiment (4). Note that the mark A in the figure indicates noise, and the magnitude of the noise level indicates the magnitude of the noise level.

As shown in FIG. 8A, the demodulated signals of the receiving units stored in the storage unit 20 are sent to the signal processing unit 21C in units of a predetermined time t. Each demodulated signal input to the signal processing unit 21C is weighted according to the reception quality level as shown in FIG. In this case, for each reception quality level, the level 5 signal is amplified twice, the level 4 signal is amplified 1.5 times, the level 3 signal is amplified one time, and the level 2 signal is amplified 0.5 times And so on.

Each weighted signal is added as shown in FIG. 8 (c) (in this case, the signal level is amplified five times), and then averaged as shown in FIG. 8 (d). (in this case,
The signal level after the addition processing is returned to the original signal level (1/5), and a process of generating an output signal by connecting the signals subjected to the addition averaging process is performed.

The demodulated signal of each receiving unit stored in the storage unit 20 is weighted according to the reception quality level, so that the received signal level is low, that is, the noise level of the demodulated signal with a lot of noise is reduced, and the weighted signal is added. By performing the averaging process, the noise level is further reduced.

FIG. 9 is a flowchart showing processing operations performed by the control unit 22C in the broadcast receiving apparatus 10C according to the embodiment (4). This processing operation is executed every predetermined time when a broadcast radio wave is received. The processing operation shown in FIG. 9 is such that steps S31 and S32 are inserted instead of steps S3 and S4 shown in FIG. 3, and only differences will be described below.

In step S31, control is performed to read the demodulated signal of each receiving unit stored in the storage unit 20, and then the process proceeds to step S32.
In step S32, the signal processing unit 21C is weighted according to the reception quality level for each demodulated signal sent from the storage unit 20, and the weighted signals are added and averaged.
Control is performed to generate an output signal by connecting the summed and averaged signals, and then the process returns to step S1 to repeat the process.

According to the broadcast receiving apparatus 10C according to the above embodiment (4), the demodulated signal of each receiving unit stored in the storage unit 20 is read, and each signal sent from the storage unit 20 by the signal processing unit 21C. Weighting is performed according to the reception quality of the demodulated signal, and an output signal is generated by connecting signals obtained by averaging the weighted signals. Therefore, after the weighting, an output signal generated based on the signal obtained by averaging is output without interruption, and is output in substantially the same manner as the broadcast receiving apparatus 10 according to the above embodiment (1). Therefore, even when the state of the received radio wave changes frequently, a signal without disturbance can be output.

Further, the weighting is set so that a signal having a low reception quality, for example, a signal containing a lot of noise is reduced by the weighting, and a signal having a high reception quality, for example, a signal containing little noise, is set to a high amplification level. Therefore, if these are added and averaged, the noise component contained in the signal with low reception quality can be reduced, and when a plurality of demodulated signals are added and averaged, the noise level of the entire signal can be further reduced.

Next, a broadcast receiving apparatus according to embodiment (5) will be described. However, the configuration of the broadcast receiving apparatus 10D according to the embodiment (5) is the same as the broadcast receiving apparatus 10 shown in FIG. 1 except for the signal processing unit and the control unit, and therefore has different functions here. The signal processing unit 21D and the control unit 22D are assigned different reference numerals, and descriptions of other components are omitted.

Based on the detection signal from the reception state detection unit 19, the control unit 22 </ b> D receives the broadcast radio wave reception quality at each reception unit and the demodulated signal of each reception unit stored in the storage unit 20. Read control function for reading the demodulated signal with the best quality and some (for example, the lower two) demodulated signals with the poorer receiving quality, and detecting the noise component from the demodulated signal with the worse receiving quality And a signal processing control function for generating an output signal from which the noise component included in the demodulated signal having the best reception quality is removed using the noise component.

Based on the signal processing control signal from the control unit 20, the signal processing unit 21D detects a noise component from the demodulated signal with the poor reception quality sent from the storage unit 20, and uses the noise component, A process of generating an output signal based on a signal from which a noise component included in the demodulated signal having good reception quality is removed is performed.

FIGS. 10A to 10C are diagrams for explaining a signal processing method in the broadcast receiving device 10D according to Embodiment (5). Note that the mark A in the figure indicates noise, and the magnitude of the noise level indicates the magnitude of the noise level.

As shown in FIG. 10 (a), the demodulated signal with the highest reception quality level and the lower two demodulated signals with the lower reception quality levels among the demodulated signals of the respective reception units stored in the storage unit 20 have a predetermined time. It is read out in t units and sent to the signal processing unit 21D.

From the lower two demodulated signals having a low reception quality level input to the signal processing unit 21D, FIG.
A signal including a noise component is detected as shown in (b), and then the noise included in the demodulated signal having the highest reception quality level using the detected noise component as shown in FIG. 10 (c). Processing for removing the components and connecting the signals from which the noise components have been removed to generate an output signal is performed.

Therefore, by removing the noise component included in the demodulated signal having the highest reception quality level, it is possible to remove even noise that may interfere with all antennas.

FIG. 11 is a flowchart illustrating processing operations performed by the control unit 22D in the broadcast receiving device 10D according to Embodiment (5). This processing operation is executed every predetermined time when a broadcast radio wave is received. The processing operation shown in FIG. 11 is such that steps S41 and S42 are inserted instead of steps S3 and S4 shown in FIG. 3, and only differences will be described below.

In step S41, control is performed to read out the demodulated signal having the highest received quality level and the lower two demodulated signals having the lower received quality level from among the demodulated signals of the respective receiving units stored in the storage unit 20, and then step S42. Proceed to

In step S42, the signal processing unit 21D detects a noise component included in the demodulated signal with the lower reception quality, and removes the noise component included in the demodulated signal with the best reception quality using the noise component. Then, the control is performed so that the output signals are generated by connecting the processed signals, and then the process returns to step S1 to repeat the process.

According to the broadcast receiving apparatus 10D according to the above embodiment (5), one of the demodulated signal having the best reception quality among the demodulated signals stored in the storage unit 20 and the one having the poor reception quality. The demodulated signal is read out, and the signal processing unit 21D detects a noise component included in the demodulated signal with the poor reception quality sent from the storage unit 20, and uses the noise component to detect the noise component. An output signal is generated by connecting the signals from which the noise components contained in the demodulated signal having the best reception quality are removed. Therefore, the output signal generated based on the signal from which the noise component included in the demodulated signal having the best reception quality is removed is output without interruption, and the demodulated signal to be output is output in the same manner as the broadcast receiving apparatus 10. Instantaneous disturbance of the signal can be eliminated, and a signal without disturbance can be output even when the state of the received radio wave frequently changes. In addition, noise components included in the demodulated signal with good reception quality can be removed,
Even when some noise or the like is contained in all radio waves received from each antenna, a signal from which those noise components are removed can be output, and the quality of the output signal can be further improved.

Next, a broadcast receiving apparatus according to Embodiment (6) will be described. However, the configuration of the broadcast receiving apparatus 10E according to the embodiment (6) is the same as that of the broadcast receiving apparatus 10 shown in FIG. 1 except for the signal processing unit and the control unit, and therefore has different functions here. The signal processing unit 21E and the control unit 22E are denoted by different reference numerals, and description of other components is omitted.

Based on the detection signal from the reception state detection unit 19, the control unit 22 </ b> E receives the broadcast radio wave reception quality at each reception unit and the demodulated signal of each reception unit stored in the storage unit 20. A read control function for reading a demodulated signal whose quality is a predetermined level or higher and a demodulated signal whose reception quality is less than a predetermined level; and detecting a noise component included in the demodulated signal whose reception quality is less than a predetermined level; A signal processing control function that averages demodulated signals of a predetermined level or higher and generates an output signal based on a signal obtained by removing the noise component included in the signal subjected to the addition averaging using the noise component. Yes.

Based on the signal processing control signal from the control unit 22E, the signal processing unit 21E detects a noise component included in the demodulated signal whose reception quality is less than a predetermined level transmitted from the storage unit 20, and the reception quality is A function is provided for performing a process of generating an output signal by adding and averaging demodulated signals of a predetermined level or more, and using the noise component to connect signals obtained by removing the noise component included in the added and averaged signal. .

FIGS. 12A to 12E are diagrams for explaining a signal processing method in the broadcast receiving device 10E according to Embodiment (6). Note that the mark A in the figure indicates noise, and the magnitude of the noise level indicates the magnitude of the noise level.

As shown in FIG. 12A, a demodulated signal having a reception quality level of a predetermined level or higher (for example, level 4 or higher) among the demodulated signals of each receiving unit stored in the storage unit 20, and a reception quality level of a predetermined level. The demodulated signal of less than (for example, less than level 4) is read out and sent to the signal processing unit 21E.

As shown in FIG. 12B, a noise component signal is detected from two demodulated signals whose reception quality level input to the signal processing unit 21E is less than a predetermined level, while the reception quality level is equal to or higher than the predetermined level. The two demodulated signals are subjected to addition processing as shown in FIG. 12 (c), and thereafter subjected to averaging processing as shown in FIG. 12 (d).

Then, as shown in FIG. 12 (e), using the detected noise component signal, a process for removing the noise component included in the signal subjected to the averaging process is performed, and the in-phase noise component is removed. A process for connecting output signals to generate an output signal is performed.

Therefore, by removing the noise component included in the signal obtained by averaging the demodulated signal whose reception quality level is equal to or higher than the predetermined level, it is possible to remove even noise that interferes with all antennas. As a result, the noise level can be further reduced.

FIG. 13 is a flowchart illustrating processing operations performed by the control unit 22E in the broadcast receiving device 10E according to Embodiment (6). This processing operation is executed every predetermined time when a broadcast radio wave is received. The processing operation shown in FIG. 13 is obtained by inserting steps S51 and S52 in place of steps S3 and S4 shown in FIG. 3, and only the differences will be described below.

In step S51, control is performed to read out a demodulated signal having a reception quality level equal to or higher than a predetermined level and a demodulated signal having a reception quality level lower than the predetermined level from among the demodulated signals stored in the storage unit 20. Proceed to step S52.

In step S52, the signal processing unit 21E detects a noise component included in the demodulated signal whose reception quality is less than a predetermined level, adds and averages the demodulated signals whose reception quality is a predetermined level or more,
Using the noise component, control is performed to connect the signal from which the noise component included in the addition averaged signal is removed to generate an output signal, and then the process returns to step S1 to repeat the processing.

According to the broadcast receiving apparatus 10E according to the above embodiment (6), among the demodulated signals of the respective receiving units stored in the storage unit 20, the demodulated signal having a reception quality equal to or higher than a predetermined level and the reception quality being lower than the predetermined level The demodulated signal is read out, and the signal processing unit 21E detects a noise component included in the demodulated signal with the reception quality less than a predetermined level sent from the storage unit 20, and the demodulation with the reception quality equal to or higher than the predetermined level. The signals are added and averaged, and an output signal is generated by connecting the signals from which the noise components included in the added and averaged signal are removed using the noise components. Therefore, the output signal generated based on the signal from which the noise component contained in the signal subjected to the addition averaging is removed is output without break, and is the same as the broadcast receiving apparatus 10 according to the above embodiment (1). Effect, that is, instantaneous disturbance of the output signal can be eliminated, and a signal without disturbance can be output even when the state of the received radio wave frequently changes. Further, the noise level included in the averaged signal can be reduced by averaging the demodulated signals whose reception quality is equal to or higher than a predetermined level.

Next, a broadcast receiving apparatus according to embodiment (7) will be described. However, since the configuration of the broadcast receiving apparatus 10F according to the embodiment (7) is the same as that of the broadcast receiving apparatus 10 shown in FIG. 1 except for the signal processing unit and the control unit, signals having different functions are used here. The processing unit 21F and the control unit 22F are assigned different reference numerals, and descriptions of other components are omitted.

In the broadcast receiving apparatuses according to the above embodiments (1) to (6), the patterns of the read control and the signal processing control performed by the control unit are determined, but the broadcast receiving apparatus 10 according to the embodiment (7).
In F, the control unit 22F has a plurality of control patterns of read control and signal processing control according to the reception quality level, and among these control patterns, read control and signal according to the determined reception quality A function to perform processing control is provided. Further, the signal processing unit 21F is connected to the control unit 2
Based on a signal processing control signal from 2F, a function of performing signal processing according to the reception quality level is provided. That is, in the broadcast receiving device 10F according to the embodiment (7), the signals described in the respective broadcast receiving devices according to the above embodiments (1) to (6) according to the determined reception quality level of the broadcast radio wave. The processes are executed in combination as appropriate.

FIG. 14 is a flowchart showing processing operations performed by the control unit 22F in the broadcast receiving device 10F according to the embodiment (7). This processing operation is executed every predetermined time when a broadcast radio wave is received.

First, in step S61, a process for obtaining a detection signal of the reception state (for example, reception field strength, noise level, S / N ratio, etc.) of the broadcast radio wave in each reception unit from the reception state detection unit 19 is performed, and then step S62 Proceed to

In step S62, a process for determining the level of broadcast wave reception quality in each receiver based on the acquired detection signal of the broadcast wave reception state in each receiver is performed in five stages, and then the process proceeds to step S63.

In step S63, it is determined whether or not a demodulated signal of level 5 reception state with the highest reception quality is included. If it is determined that a demodulated signal of level 5 reception state is included, the process proceeds to step S64.

In step S64, control is performed to read out the demodulated signal in the reception state with the reception quality of level 5 from the demodulated signal of each receiving unit stored in the storage unit 20, and then the process proceeds to step S65. In step S65, the signal processing unit 21 is controlled to generate an output signal by connecting the demodulated signals in the reception state with the reception quality level 5 read from the storage unit 20, and then the process returns to step S61.

On the other hand, if it is determined in step S63 that the demodulated signal in the reception state with the reception quality of level 5 is not included, the process proceeds to step S66. In step S66, it is determined how many demodulated signals in the reception state of level 4 having the second highest reception quality are included, and if it is determined that two or more demodulated signals in the reception state of level 4 are included, step S66 is performed. Proceed to S67.

In step S67, the reception quality is level 4 among the demodulated signals stored in the storage unit 20.
Control is performed to read the demodulated signal in the reception state, and then the process proceeds to step S68. Step S
68, the signal processing unit 21 is controlled to average the demodulated signals in the reception state of level 4 read from the storage unit 20, and to connect the added averaged signals to generate an output signal. Thereafter, the process returns to step S61.

On the other hand, if it is determined in step S66 that there are one or less demodulated signals in the reception state with the reception quality of level 4, the process proceeds to step S69. In step S69, it is determined whether or not one demodulated signal in the level 4 reception state is included. If it is determined that one demodulated signal in the level 4 reception state is included, the process proceeds to step S70.

In step S70, control is performed to read the demodulated signal in the reception state at level 4 and the lower two demodulated signals with low reception quality levels, and then the process proceeds to step S71. Step S71
Then, the signal processing unit 21 detects a noise component included in the lower two demodulated signals having a low reception quality level, and uses the noise component to include a noise component included in the demodulated signal in the level 4 reception state. Control is performed to generate an output signal by connecting the signals from which the signals are removed, and then the process returns to step S61.

On the other hand, if it is determined in step S69 that no demodulated signal in the level 4 reception state is included, the process proceeds to step S72. In step S72, control is performed to read out the upper two demodulated signals having a high reception quality level and the lower two demodulated signals having a low reception quality level from among the demodulated signals stored in the storage unit 20, and then to step S73. move on.

In step S73, the signal processing unit 21 detects a noise component included in the lower two demodulated signals with a low reception quality level, weights the upper two demodulated signals with a high reception quality level, and weights them. The two upper signals are averaged and the noise component is used.
Control is performed to generate an output signal by connecting the signals from which the noise components included in the addition averaged signal are removed, and then the process returns to step S61 to repeat the processing.

According to the broadcast receiving device 10F according to the above embodiment (7), the control unit 22F includes a plurality of control patterns of reading control and signal processing control according to the level of reception quality, and from among these control patterns. Then, read control and signal processing control corresponding to the determined reception quality are performed, and signal processing according to the level of reception quality is performed by the signal processing unit 21F based on the signal processing control signal from the control unit 20. Therefore, appropriate signal processing according to the reception quality level can be performed, and a high-quality signal with a reduced noise level can be output.

It is the block diagram which showed roughly the principal part of the broadcast receiving apparatus which concerns on embodiment (1) of this invention. (A), (b) is a figure for demonstrating the signal processing method in the broadcast receiver which concerns on Embodiment (1). It is the flowchart which showed the processing operation which the control part in the broadcast receiver which concerns on embodiment (1) performs. (A)-(c) is a figure for demonstrating the signal processing method in the broadcast receiver which concerns on Embodiment (2). It is the flowchart which showed the processing operation which the control part in the broadcast receiver which concerns on embodiment (2) performs. (A)-(c) is a figure for demonstrating the signal processing method in the broadcast receiver which concerns on Embodiment (3). It is the flowchart which showed the processing operation which the control part in the broadcast receiver which concerns on embodiment (3) performs. (A)-(d) is a figure for demonstrating the signal processing method in the broadcast receiver which concerns on Embodiment (4). It is the flowchart which showed the processing operation which the control part in the broadcast receiver which concerns on embodiment (4) performs. (A)-(c) is a figure for demonstrating the signal processing method in the broadcast receiver which concerns on Embodiment (5). It is the flowchart which showed the processing operation which the control part in the broadcast receiver which concerns on Embodiment (5) performs. (A)-(e) is a figure for demonstrating the signal processing method in the broadcast receiver which concerns on Embodiment (6). It is the flowchart which showed the processing operation which the control part in the broadcast receiver which concerns on Embodiment (6) performs. It is the flowchart which showed the processing operation which the control part in the broadcast receiver which concerns on embodiment (7) performs. It is the block diagram which showed schematically the principal part of the conventional digital broadcast receiver.

Explanation of symbols

10, 10A, 10B, 10C, 10D, 10E, 10F Broadcast receiving device 11 First antenna 12 First receiving unit 13 Second antenna 14 Second receiving unit 15 Third antenna 16 Third receiving unit 17 Fourth antenna 18 Fourth receiving unit 19 Reception state detecting unit 20 Storage unit 21, 21A, 21B, 21C, 21D, 21E, 21F Signal processing unit 22, 22A, 22B, 22C, 22D, 22E, 22F Control unit

Claims (2)

Multiple antennas to receive broadcast waves,
A plurality of receiving means for extracting signal components from each broadcast radio wave received by these antennas;
Receiving state detecting means for detecting the receiving state of each broadcast radio wave;
Storage means for storing each signal component extracted from each broadcast radio wave by the plurality of receiving means;
Based on the detection signal from the reception state detection means, the reception quality of each broadcast radio wave is determined at a predetermined timing, and based on the determination result, a predetermined condition is selected from the signals stored in the storage means. Control means for performing readout control for reading out a suitable signal and signal processing control corresponding to the readout control;
Signal processing means for performing processing for generating an output signal based on a signal sent from the storage means based on signal processing control by the control means;
The control means reads out the signal having the best reception quality from among the signals stored in the storage means and some signals having the poor reception quality, and the signal having the poor reception quality. And a signal processing control for generating an output signal from which the noise component contained in the signal having the best reception quality is removed using the noise component.
The signal processing means detects a noise component included in the signal having the poor reception quality sent from the storage means based on the signal processing control by the control means, and uses the noise component to A broadcast receiving apparatus that performs processing for generating an output signal based on a signal from which a noise component contained in a signal having the best reception quality is removed. Multiple antennas to receive broadcast waves,
A plurality of receiving means for extracting signal components from each broadcast radio wave received by these antennas;
Receiving state detecting means for detecting the receiving state of each broadcast radio wave;
Storage means for storing each signal component extracted from each broadcast radio wave by the plurality of receiving means;
Based on the detection signal from the reception state detection means, the reception quality of each broadcast radio wave is determined at a predetermined timing, and based on the determination result, a predetermined condition is selected from the signals stored in the storage means. Control means for performing readout control for reading out a suitable signal and signal processing control corresponding to the readout control;
Signal processing means for performing processing for generating an output signal based on a signal sent from the storage means based on signal processing control by the control means;
Read control for reading out a signal having a reception quality equal to or higher than a predetermined level and a signal having a reception quality less than a predetermined level from among the signals stored in the storage means, and the signal having the reception quality less than a predetermined level. A signal for detecting a noise component included in the signal, averaging the signals having a reception quality equal to or higher than a predetermined level, and generating an output signal from which the noise component included in the signal subjected to the average addition is removed using the noise component Process control and
The signal processing means detects a noise component included in a signal having a reception quality less than a predetermined level sent from the storage means based on signal processing control by the control means, and the reception quality is equal to or higher than a predetermined level. The broadcast receiving apparatus performs a process of generating an output signal based on a signal obtained by removing the noise component included in the signal subjected to the averaging process using the noise component. .

Images