JP2009284247A - Receiving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiving device which actualize further power saving. <P>SOLUTION: The receiving device has a tuner part 1 which receives digital broadcasting, an OFDM demodulation part 2 which demodulates the received signal received by the tuner part 1, an error correcting part 3 which outputs a first broadcasting signal T1 obtained by subjecting the received signal demodulated by the OFDM demodulation part 2 to error correcting processing, a partial reception detection part 4 which determines whether a partial reception signal is contained in the first broadcasting signal T1 output from the error correcting part 3 or not and, if the partial reception signal is contained, extracts only the partial reception signal, and a TS low-speed processing part 5 which outputs a second broadcasting signal T3 which is obtained by subjecting the partial reception signal to TS low-speed processing which reduces a TS rate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a digital signal receiving apparatus.

In recent years, digital television broadcasting has been started. In Europe and Japan, OFDM (Orthogonal Frequency) is used as a transmission method for terrestrial television broadcasting systems.
(Energy Division Multiplexing) modulation method is employed.
The OFDM modulation scheme has an advantage that delay interference characteristics in a multipath propagation path, which is an essential transmission condition in terrestrial television broadcasting, can be improved by transmitting a wide area signal with a large number of carriers orthogonal to each other.

In Japanese digital broadcasting, ISDB-T (Integrated Services)
Digital Broadcasting for Terrestrial) terrestrial digital television system (hereinafter referred to as ISDB-T system) is adopted. ISD
In the BT system, TS (Transport Str) defined in the MPEG2 standard is used.
eam), outer coding (eg, RS coding) and inner coding (eg, convolutional coding)
Are subjected to signal processing such as error correction coding, interleave coding, and digital modulation, and are further subjected to OFDM modulation and output. Here, the TS is a signal obtained by encoding and packetizing an audio signal, a video signal, and the like. Specifically, the TS is composed of a plurality of TS packets, and each TS packet is encoded audio. Signal, video signal, data broadcasting and electronic program guide (E
It is composed of packets such as PG (Electric Program Guide).

The transmission data defined by the ISDB-T encoding method is configured in units of data composed of a plurality of TS packets defined by the MPEG2 standard, and 13 OFDM segments to which a pilot signal is added for each group of data. They are combined (13 segments) and transmitted.

Further, in the ISDB-T system, hierarchical transmission in which a plurality of layers having different transmission characteristics are simultaneously transmitted is possible. Each layer is composed of one or a plurality of OFDM segments, and transmission parameters such as a carrier modulation scheme, an inner code coding rate, and a time interleave length can be designated for each layer. In order to enable the mixing of a plurality of transmission parameters, each OF
The DM segment includes a TMCC (Transmission and M) which is a control signal.
(ultraplexing configuration control) signal is added, and there are 13 OFDM segments to which this TMCC signal is added.
An FDM symbol is configured, and an OFDM frame is configured by 204 OFDM symbols.

Then, IFFT (Inverse Fast Fourier Transform), guard interval addition, quadrature modulation, and frequency conversion are performed, and an OFDM transmission signal is output as an RF signal.

As one of the terrestrial digital broadcasting services, the transmission side (broadcasting station)
High quality broadcast signal called 12 segment broadcast using 12 out of 3 segments (13 segments) and low quality called 1 segment broadcast using the remaining 1 segment but strong against noise, low C / N There is a service that simultaneously broadcasts information of the same content using a broadcast signal that can be received even with (carrier noise ratio). This is called a hierarchical service.
Hereinafter, this one-segment broadcast signal is referred to as a partial reception signal.

The above-mentioned TMCC signal is added with a flag indicating the presence or absence of this partial reception signal and whether or not emergency alert information is being broadcast. Using this flag, when emergency alert information is being broadcast, the broadcast to be viewed is switched from a 12-segment broadcast broadcast signal to a partial reception signal, and using a partial reception signal broadcast that is resistant to noise, for example, moving There is known a technology that can reliably receive emergency alert information broadcasting even in unstable situations. (For example, see Patent Document 1)
However, when the partial reception signal broadcast is output as in Patent Document 1, processing is performed at the same processing speed as when outputting a normal 12-segment broadcast. When power generation is required, power consumption cannot be reduced.
JP 2007-96403 ([0015], FIG. 1)

  An object of this invention is to provide the receiver which implement | achieves power saving.

In order to achieve the above object, a receiving apparatus according to one embodiment of the present invention performs demodulation on a demodulating unit that demodulates a received signal of digital broadcasting and error correction processing on the received signal demodulated by the demodulating unit. An error correction unit for outputting a first broadcast signal, and determining whether or not a partial reception signal is included in the first broadcast signal, and the partial reception signal is included in the first broadcast signal In this case, a partial reception detection unit that extracts only the partial reception signal, and the partial reception signal,
And a TS low-speed processing unit that outputs a second broadcast signal subjected to TS low-speed processing for reducing the TS rate.

  ADVANTAGE OF THE INVENTION According to this invention, the receiver which can implement | achieve power saving can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing a configuration of receiving apparatus 200 according to the first embodiment of the present invention. The control of the entire apparatus is controlled by a control unit 100 made of a microprocessor.
By reading a program recorded on a recording medium such as a ROM, various processes are executed according to the procedure described in the program.

First, the OFDM transmission signal received by the antenna ANT is subjected to frequency conversion and quadrature detection by the tuner unit 1, then guard interval removal, FFT (
Fast Fourier transform) and then demodulated. Then, the error correction unit 3 performs error correction processing by performing reverse processing of outer coding and inner coding processing, and returns to the TS sent from the broadcasting station.

A TS packet of the TS sent out from this broadcasting station (hereinafter referred to as the first broadcast signal T1) is output to both the partial reception detection unit 4 and the outside. The partial reception detection unit 4 extracts only the partial reception signal from the first broadcast signal T1, and the TS low-speed processing unit 5 converts the extracted partial reception signal into a low-speed TS corresponding to the partial reception signal. The second broadcast signal T3, which is a TS of the low TS rate, is output to the outside after conversion to the rate. The first broadcast signal T1 is composed of a 13-segment OFDM signal, and the second broadcast signal T3 is composed of a one-segment OFDM signal.

  Next, details of the operation of the TS low speed processing unit 5 will be described with reference to FIG.

First, the first broadcast signal T <b> 1 output from the error control unit 3 is input to the partial reception detection unit 4. The partial reception detection unit 4 extracts only the partial reception signal from the first broadcast signal T1 based on the presence / absence of the partial reception flag included in the TMCC signal and the transmission parameter of the TMCC signal, and performs the TS low-speed processing on the partial reception signal. Output to unit 5. In the TS low speed processing unit 5, first, the write processing unit 51 writes the partial reception signal in the buffer 52. Next, by reading the partial reception signal written in the buffer 52 by the read processing unit 53 at a low rate,
A second broadcast signal T3 in which the TS rate of the partial reception signal is reduced is output.

  Next, the operation of the present embodiment will be described.

The processing shown in the following flowcharts is performed by the control unit 100 that is a microcomputer.
Is executed by reading a predetermined program. The same applies to other embodiments, and is executed by the control unit 100 reading a program corresponding to each embodiment.

First, the operation until both the first broadcast signal T1 and the second broadcast signal T3 output from the error correction unit 3 are output to the outside of the receiving apparatus 200 will be described with reference to the flowchart of FIG. To do.

In step S1, the process from reception of the OFDM transmission signal at the reception antenna ANT to error correction processing in the error correction unit 3 is executed. In step S2a, the first broadcast signal T1 is transmitted from the partial reception detection unit 4 and the reception device 200. Output to both sides. And step S3
Thus, it is determined whether or not the first broadcast signal T1 output to the partial reception detection unit 4 includes a partial reception signal. If the first broadcast signal T1 includes a partial reception signal, step S4
Thus, the TS low speed processing unit 5 performs TS low speed processing on the partial reception signal, and step S
5, the second broadcast signal T3 which is a partial reception signal subjected to TS low-speed processing is output to the outside of the receiving apparatus 200, and it is determined whether or not processing of all OFDM transmission signals is completed in step S6.
If completed, this operation ends. If not completed, the process returns to step S1, and all the O
The above operation is repeated until the FDM transmission signal is completed. If it is determined in step S3 that there is no partial reception signal, the process proceeds to step S6.

Next, as shown in FIG. 4, a configuration in which a TS switching output unit 6 and an MPEG decoding unit 7 are added to the configuration of FIG. 1 will be described. The configuration from the ANT to the error correction unit 3 is the same as that in FIG.

The error correction unit 3 converts the first broadcast signal T1 into a TS switching output unit 6 and a partial reception detection unit 4.
Output to both. The TS switching output unit 6 receives both the first broadcast signal T1 and the second broadcast signal T3 through the partial reception detection unit 4 and the TS low speed processing unit 5.
The TS switching output unit 6 uses the first broadcast signal T1 based on the switching signal from the viewer.
And the second broadcast signal T3 are output to the MPEG decoding unit 7. And
The MPEG decoding unit 7 decodes the first broadcast signal T1 or the second broadcast signal T3,
For the first broadcast signal T1, 12-segment broadcast using 12 segments for high-quality broadcast out of 13 segments, and for the second broadcast signal T3, 1-segment broadcast using 1 segment It is output outside the receiving apparatus 200. Note that the first broadcast signal T1 and the second broadcast signal T3 are transmitted through the error correction unit 3 and the TS without using the TS switching output unit 6, respectively.
The switching process may be executed in the process after the MPEG decoding unit 7 by directly outputting from the low speed processing unit 5 to the MPEG decoding unit 7.

Next, an operation of switching between the first broadcast signal T1 and the second broadcast signal T3 and outputting the signal to the MPEG decoding unit 7 will be described with reference to the flowchart of FIG. First, Steps S1 to S3 are the same as those in the flowchart of FIG. Next, in step S7a, the TS switching output unit 6 determines which of the first broadcast signal T1 and the second broadcast signal T3 is to be output based on the switching signal from the viewer. And
If it is determined in step S7a that the second broadcast signal T3 is to be output, in step S8,
The second broadcast signal T3 is decoded by the MPEG decoding unit 7 to output a one-segment broadcast to the outside of the receiving apparatus 200a. If it is determined in step S7a that the first broadcast signal T3 is to be output, in step S8, the first broadcast signal T1 is subjected to decoding processing by the MPEG decoding unit 7, and the 12-segment broadcast is transmitted to the OFDM receiving layer. Output to outside of 200a.

According to the present embodiment, the receiving device according to the present invention outputs the first broadcast signal to the outside of the receiving device on the one hand, extracts the partial received signal from the first broadcast signal on the other hand, and By reading out the received signal at a low rate, the second broadcast signal in which the TS rate of the partially received signal is reduced can be output to the outside of the receiving device, and whether the first broadcast signal is viewed outside the receiving device. In addition, it is possible to select whether to view the second broadcast signal.

Furthermore, after the output processing of the first broadcast signal and the second broadcast signal, a TS switching output unit is provided to match the result of the viewer selecting whether to view 1-segment broadcast or 12-segment broadcast. The signal to be output can be switched. Thereby, for example, when viewing only one segment broadcast, only the second broadcast signal is processed in the MPEG decoding unit. Since the TS rate of the second broadcast signal is reduced, the processing rate in the MPEG decoding unit is reduced, and as a result, power consumption in the MPEG decoding unit can be reduced.

(Second Embodiment)
FIG. 6 is a block diagram showing a configuration of receiving apparatus 200b according to the second embodiment of the present invention. This embodiment is different from the first embodiment in that, in the first embodiment, the TS switching processing unit 6 sends the MPEG broadcast unit 7 to the first broadcast signal T1 or the second broadcast signal T3.
Is switched based on the switching signal input from the viewer, the receiving device 200b of the present embodiment receives the TMCC detection unit 10 when receiving the emergency alert information.
A switching signal is automatically output to the switching output unit 6, and based on the switching signal, M
The point is that the first broadcast signal T1 or the second broadcast signal T3 is switched and output to the PEG decoding unit 7.

Specifically, the OFDM demodulator 2 outputs the demodulated OFDM signal to the error correction unit 3, while outputting only the TMCC signal included in the OFDM signal to the TMCC detector 10.
The TMCC detection unit 10 determines whether or not emergency warning information is included in the TMCC signal. If the emergency warning information is included, the TMCC detection unit 10 outputs a switching signal to the TS switching output unit 6. The TS switching output unit 6 then uses the first broadcast signal T based on this switching signal.
The output is switched between 1 and the second broadcast signal T3.

Next, the operation of the present embodiment will be described with reference to the flowchart of FIG. The flowchart in FIG. 7 differs from the flowchart in FIG. 5 described in the first embodiment in the output destination of the first broadcast signal T1 and the TS switching determination method.

The output destination of the first broadcast signal T1 is the TS switching determination unit 6 and the partial reception detection unit 4 as shown in step S2b.

TS switching determination is performed by determining whether or not there is emergency alert information. Specifically, it is determined in step S7b whether there is emergency alert information. If it is determined that there is emergency alert information, in step S8, the MPEG decoding unit 7 decodes the second broadcast signal T3. Processing is performed, and the one-segment broadcast is output to the outside of the receiving apparatus 200b. If it is determined in step S7b that there is no emergency warning information, step S7
8, the decoding process of the MPEG decoding unit 7 is performed on the first broadcast signal T1, and the 12-segment broadcast is output to the outside of the receiving apparatus 200b.

According to the present embodiment, the receiving apparatus extracts the partial reception signal from the first broadcast signal, and reads the partial reception signal at a low rate, thereby reducing the TS rate of the partial reception signal. Broadcast signals can be output.

Further, after output processing of the first broadcast signal and the second broadcast signal, the TS switching output unit performs TMC.
The first broadcast signal and the second broadcast signal can be switched and output based on the detection result of the emergency warning in the C detection unit. Thus, for example, when an emergency alert is detected, only the second broadcast signal is output to the MPEG decoding unit, and only the second broadcast signal is processed in the MPEG decoding unit, and the one-segment broadcast is sent to the outside of the receiving device. Can be output. Since the second broadcast signal has a reduced TS rate, the processing rate in the MPEG decoding unit is reduced. As a result, power consumption in the MPEG decoding unit can be reduced, and charging of the receiving device can be performed in an emergency. Even when it is not possible, the power supply to the receiving device can be prolonged.
Furthermore, 1-segment broadcasting is resistant to noise and can be received even with a low C / N (carrier noise ratio), so even in the event of an emergency such as a disaster, even if the reception status of all 13 segments is unstable, Easy to receive.

(Third embodiment)
FIG. 8 is a block diagram showing a configuration of receiving apparatus 200c according to the third embodiment of the present invention. This embodiment is different from the first embodiment in that, in the first embodiment, the TS switching processing unit 6 sends the MPEG broadcast unit 7 to the first broadcast signal T1 or the second broadcast signal T3.
Is switched based on the switching signal input from the viewer, the receiving device 200c of the present embodiment has a remaining battery level of the battery that supplies power to the receiving device 200c. When the predetermined value or less is reached, a switching signal is automatically output from the power detection unit 11 to the switching output unit 6, and the MPEG decoding unit 7 receives the first signal based on the switching signal.
The broadcast signal T1 or the second broadcast signal T3 is switched and output. In addition, the power supply of the receiving device 200c of this Embodiment shall be supplied from the battery inside the receiving device 200c.

Specifically, the power detection unit 11 that monitors the remaining battery level outputs a switching signal to the TS switching output unit 6 when the remaining battery level falls below a predetermined amount. The TS switching output unit 6 switches the output between the first broadcast signal T1 and the second broadcast signal T3 based on this switching signal.

Next, the operation of the present embodiment will be described with reference to the flowchart of FIG. The flowchart of FIG. 9 differs from the flowchart of FIG. 5 of the first embodiment in the output destination of the first broadcast signal and the TS switching determination method.

The output destination of the first broadcast signal T1 is the TS switching determination unit 6 and the partial reception detection unit 4 as shown in step S2b.

Further, the TS switching determination is performed by determining whether or not the battery remaining amount has become a predetermined amount or less. Specifically, it is determined in step S7c whether or not the remaining battery level is equal to or less than a predetermined amount.
The broadcast signal T3 is subjected to a decoding process by the MPEG decoding unit 7 to output a one-segment broadcast to the outside of the receiving apparatus 200c. If the remaining battery level is not less than or equal to the predetermined amount, in step S8, the decoding process of the MPEG decoding unit 7 is performed on the first broadcast signal T1, and the 12-segment broadcast is output to the outside of the receiving apparatus 200c. To do. In addition, even if the remaining battery charge becomes less than the predetermined amount,
In step S8, a 12 segment broadcast is output.

According to the present embodiment, the receiving apparatus extracts the partial reception signal from the first broadcast signal, and reads the partial reception signal at a low rate, thereby reducing the TS rate of the partial reception signal. A signal can be output.

Furthermore, after the output processing of the first broadcast signal T1 and the second broadcast signal T3, the TS switching output unit can switch the signal based on the detection result of the remaining battery level of the receiving device. Thereby, for example, when the internal battery of the receiving apparatus becomes a predetermined amount or less, only the second broadcast signal T3 is output to the MPEG decoding unit, and the MPEG decoding unit outputs the second broadcast signal T3.
Only 3 will be processed. Since the second broadcast signal T3 has a reduced TS rate, the processing rate in the MPEG decoding unit is reduced, and as a result, the power consumption in the MPEG decoding unit can be reduced. For this reason, even when the remaining battery level of the receiving device decreases, it is possible to continue viewing the broadcast by one-segment broadcasting.

(Fourth embodiment)
FIG. 10 is a block diagram showing a configuration of a receiving apparatus 200d according to the fourth embodiment of the present invention. The present embodiment differs from the first embodiment in that, in the first embodiment, the TS switching processing unit 6 sends the MPEG broadcast unit 7 to the first broadcast signal T1 or the second broadcast signal T.
3 is performed based on the switching signal input from the viewer, the receiving device 200d of the present embodiment transmits the error rate from the error correction unit 3 to the error rate detection unit 12. When the error rate becomes higher than a predetermined value, a switching signal is automatically output from the error detection unit 12 to the TS switching output unit 6, and the first signal is output to the MPEG decoding unit 7 based on the switching signal. The broadcast signal T1 or the second broadcast signal T3 is switched and output.

Specifically, when the error rate of the OFDM signal is output from the error stop unit 3 to the error rate detection unit 12, and this error rate becomes higher than a predetermined value set in advance, a switching signal is sent to the TS switching output unit 6. Is output. The TS switching output unit 6 switches the output between the first broadcast signal T1 and the second broadcast signal T3 based on this switching signal.

Next, the operation of the present embodiment will be described with reference to the flowchart of FIG. FIG.
The flowchart of FIG. 1 and the flowchart of FIG. 5 of the first embodiment differ in the output destination of the first broadcast signal and the TS switching determination method.

The output destination of the first broadcast signal T1 is the TS switching determination unit 6 and the partial reception detection unit 4 as shown in step S2b.

The TS switching determination is performed by determining whether or not the error rate in the error correction unit has become higher than a predetermined value. Specifically, in step S7d, it is determined whether or not the error rate output from the error correction unit 3 to the error rate detection unit 12 is higher than a predetermined value. If the error rate is higher than the predetermined value, step S8 is performed. Thus, the MPEG decoding unit 7 for the second broadcast signal T3.
The 1-segment broadcast is output to the outside of the receiving apparatus 200d. If the error rate is not higher than the predetermined value, the decoding process of the MPEG decoding unit 7 is performed on the first broadcast signal T1 in step S8, and the 12-segment broadcast is output to the outside of the receiving device 200d. . Note that, even if the value is once higher than the predetermined value, if the error rate is subsequently lower than the predetermined value due to an improvement in the error rate, the 12-segment broadcast is output in step S8.

According to the present embodiment, the receiving device extracts the partial reception signal from the first broadcast signal T1,
In addition, by reading out the partial reception signal at a low rate, it is possible to output the second broadcast signal T3 in which the TS rate of the partial reception signal is reduced.

Furthermore, after the output processing of the first broadcast signal T1 and the second broadcast signal T3, the TS switching output unit can switch the signal based on the error rate in the error correction unit. Thereby, for example, when the error rate of the error correction unit is deteriorated from a predetermined value, only the second broadcast signal T3 is output to the MPEG decoding unit, and only the second broadcast signal T3 is processed in the MPEG decoding unit. become. Since the second broadcast signal T3 has a reduced TS rate, the processing rate in the MPEG decoding unit is reduced, and as a result, the power consumption in the MPEG decoding unit can be reduced.

(Fifth embodiment)
FIG. 12 is a block diagram showing a configuration of receiving apparatus 200e according to the fifth embodiment of the present invention. In the above-described first to fourth embodiments, the receiving device 2 serves as a switching signal output means to the TS switching output unit when it is based on a viewer's selection or based on emergency alert information.
The case based on the decrease in the internal battery of 00e and the case based on the deterioration of the error rate were performed separately, but in this embodiment, as shown in FIG. All are implemented.

The operation of the present embodiment will be described with reference to the flowchart of FIG. In the present embodiment, steps S7a to 7d are all connected under the OR condition, so that step S7
If any of a to 7d is Yes, that is, the viewer has selected the output of the second broadcast signal T3, detected an emergency alert, or the internal battery of the receiving device 200e has decreased, or When the error rate of the error correction unit 3 is worse than a predetermined value, the TS switching output unit 6 outputs the second broadcast signal T3 to the MPEG decoding unit 7.

According to the present embodiment, in addition to the effects of the first to fourth embodiments, more flexible selection is possible for the TS switching output.

In the present embodiment, all of these switching signal output means are mounted. However, they may be mounted as appropriate and combined as appropriate.

In the first to fifth embodiments described above, the switching determination in the TS switching output unit 6 is described as being performed automatically, but it may be performed manually. For example, when each switching signal is input to the TS switching output unit 6, the viewer may be notified by screen display or audio output, and the viewer may switch manually.

In the first to fifth embodiments described above, various switching signals (switching signals by viewers, switching signals from the TMCC detection unit 10, switching signals from the power detection unit 11,
The switching signal from the error detection unit 12) is input to the TS switching output unit 6, but may be input to the control unit 100. Then, a switching signal may be output from the control unit 100 to the TS switching output unit 6.

It is a block diagram of the receiver which concerns on the 1st Embodiment of this invention. It is a detailed block diagram of the TS low-speed processing unit according to the first embodiment of the present invention. It is a flowchart of the receiver which concerns on the 1st Embodiment of this invention. It is a block diagram of the receiver which concerns on the 1st Embodiment of this invention. It is a flowchart of the receiver which concerns on the 1st Embodiment of this invention. It is a block diagram of the receiver which concerns on the 2nd Embodiment of this invention. It is a flowchart of the receiver which concerns on the 2nd Embodiment of this invention. It is a block diagram of the receiver which concerns on the 3rd Embodiment of this invention. It is a flowchart of the receiver which concerns on the 3rd Embodiment of this invention. It is a block diagram of the receiver which concerns on the 4th Embodiment of this invention. It is a flowchart of the receiver which concerns on the 4th Embodiment of this invention. It is a block diagram of the receiver which concerns on the 5th Embodiment of this invention. It is a flowchart of the receiver which concerns on the 5th Embodiment of this invention.

Explanation of symbols

1: tuner unit 2: OFDM demodulation unit 3: error correction unit 4: partial reception detection unit 5: TS low speed processing unit 6: TS switching output unit 7: MPEG decoding unit 10: TMCC detection unit 11: power detection unit 11a: internal Battery 12: Error rate detection unit 51: Write processing unit 52: Buffer 53: Read processing unit 100: Control unit 200, 200a, 200b, 200c, 200d, 200e: Receiving device T1: First broadcast signal (13 segments)
T2: Partial reception signal T3: Second broadcast signal (one segment)
T4: 1st broadcast signal (13 segments) or 2nd broadcast signal (1 segment)
T5: 12 segment broadcast or 1 segment broadcast

Claims (6)

A demodulator that demodulates the received signal of the digital broadcast;
An error correction unit that outputs a first broadcast signal subjected to error correction processing on the reception signal demodulated by the demodulation unit;
It is determined whether or not a partial reception signal is included in the first broadcast signal. If the partial reception signal is included in the first broadcast signal, partial reception is performed by extracting only the partial reception signal. A detection unit;
A TS low-speed processing unit that outputs a second broadcast signal obtained by performing TS low-speed processing for reducing the TS rate with respect to the partial reception signal. The receiving apparatus according to claim 1, further comprising a switching output unit that switches and outputs the first broadcast signal and the second broadcast signal. It is detected whether or not emergency alarm information is included in the demodulated reception signal, and when the emergency alarm information is included in the demodulated reception signal, the first switching signal is A first detector for outputting to the switching output means;
The receiving apparatus according to claim 2, wherein the switching output unit switches and outputs the first broadcast signal and the second broadcast signal based on the first switching signal. The receiving apparatus according to claim 3, wherein the emergency alert information is a part of a TMCC signal included in an OFDM transmission signal. The battery further comprises a second detection unit that monitors a remaining battery level and outputs a second switching signal to the switching output unit when the remaining battery level is equal to or less than a predetermined amount;
The switching output unit switches and outputs the first broadcast signal and the second broadcast signal based on the second switching signal. The receiving device described in 1. A third detection unit that receives an error rate of the error correction process measured by the error correction unit;
The third detection unit outputs a third switching signal to the switching output unit when the error rate output from the error correction unit is higher than a predetermined value,
The switching output unit switches and outputs the first broadcast signal and the second broadcast signal based on the third switching signal. The receiving device described in 1.

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