JP2006042060A - Broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To extend viewable conditions of digital broadcasting. <P>SOLUTION: The broadcast receiver is provided with a normal broadcast processor 1 for performing the decoding processing of HDTV type (Hi-Vision type) signals and a simple broadcast processor 31 for performing the decoding processing of one-segment type (simple mobile object type) signals, and when HDTV type broadcast is received, the normal broadcast processor 1 performs the decoding processing of an HDTV signal, included in a signal inputted from an OFDM decoding master part 4 and outputs an image signal and a sound signal obtained as the result of the decoding processing to an image output processing part 41 and a sound processing part 45. When the one-segment type broadcast is received, the simple broadcast processor 31 decodes an one-segment type signal, included in the signal inputted from the OFDM decoding master part 4 and outputs an image signal and a sound signal, obtained as a result of decoding processing to the image output processing part 41 and the sound processing part 45. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a broadcast receiving apparatus having a function of receiving digital broadcasting radio waves.

2. Description of the Related Art Conventionally, some television broadcast receivers receive digital broadcast waves such as terrestrial digital television broadcasts and terrestrial digital audio broadcasts, and respond to HDTV (High Definition Television) signals contained in the broadcast waves. There is one that outputs high-definition image information on a monitor after decoding processing (see, for example, Patent Document 1).
JP 2003-23582 A

  In general, an HDTV broadcast wave receiving circuit has a narrower operating temperature range compared to a normal analog broadcast wave receiving circuit. In addition, since the HDTV receiver circuit consumes higher power than a normal analog receiver circuit, the operable time during battery driving is limited. For these reasons, the conditions under which the user can view the contents of HDTV broadcasts are limited. For example, when a device is installed inside a car, broadcast viewing over a long period of time is likely to occur. It was difficult to continue.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a broadcast receiving apparatus that can expand the viewing conditions for digital broadcasting.

  A broadcast receiving apparatus according to the present invention includes a first signal processing circuit for processing a signal having a first bandwidth included in a digital broadcasting radio wave received and selected by a receiving channel selection unit, and the first signal. A second signal processing circuit for processing a signal having a wide operating temperature range compared to the processing circuit and having a narrower bandwidth than the first bandwidth included in the broadcast radio wave selected for reception; It is characterized by having.

  Alternatively, a first signal processing circuit for processing a signal having a first bandwidth included in a digital broadcasting radio wave received and selected by the receiving channel selection unit is consumed in comparison with the first signal processing circuit. And a second signal processing circuit for processing a signal having a small bandwidth as compared with the first bandwidth, which is contained in the broadcast radio wave selected and received, and which has low power.

  In the broadcast receiving apparatus according to the present invention, a first signal processing circuit for processing a signal having a first bandwidth included in a digital broadcast radio wave received and selected by the reception channel selection unit, and the first signal A second signal processing circuit for processing a signal having a wider operable temperature range than the processing circuit and having a narrower bandwidth than the first bandwidth included in the broadcast radio wave selected for reception; Thus, even if the ambient temperature of the apparatus is outside the operable range of the first signal processing circuit, the second signal processing circuit enables broadcast viewing. Therefore, it is possible to expand the viewing conditions for digital broadcasting.

  In the broadcast receiving apparatus according to the present invention, a first signal processing circuit for processing a signal having a first bandwidth included in a digital broadcast radio wave received and selected by the reception channel selection unit, and the first signal processing circuit. A second signal processing circuit that consumes less power than the first signal processing circuit and that processes a signal having a narrower bandwidth than the first bandwidth included in the received broadcast radio wave. Thus, even when no external power is supplied to the apparatus main body and the apparatus main body is operated by power supply from a battery, it is possible to view a broadcast for a long time. Therefore, it is possible to expand the viewing conditions for digital broadcasting.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration example of a broadcast receiving apparatus according to an embodiment of the present invention.
This broadcast receiving apparatus is an indoor or in-vehicle broadcast receiving apparatus that receives a digital broadcasting radio wave such as terrestrial digital television broadcasting and decodes video signals and audio signals included in the broadcasting radio wave. And has a function of performing video monitor display and audio speaker output.

  Digital broadcast radio waves include HDTV (High Definition Television) (high-definition) signals that contain high-definition image information and audio information, and image information and audio that have a narrower bandwidth than HDTV signals. A one-segment (simple moving image) signal including information is included. This television receiver receives broadcast radio waves transmitted from a broadcasting station, decodes either an HDTV system signal or a 1-segment system signal included in the broadcast radio waves, and displays a video on a monitor. And audio speaker output.

  The broadcast receiving apparatus shown in FIG. 1 includes a normal broadcast processor 1 that performs a decoding process on an HDTV system signal included in a broadcast radio wave from a broadcast station. The normal broadcast processor 1 is a kind of processor having a back-end processing function of a digital television receiver. In addition, the antenna 2 that receives a digital broadcast radio wave that is modulated and transmitted by an OFDM (Orthogonal Frequency Division Multiplex) system from a broadcast station, and the broadcast radio wave that the antenna 2 receives are selected in advance. A tuner 3 that selects a radio wave of a broadcasting station and an OFDM demodulation master unit 4 that demodulates a signal obtained by the channel selection are provided.

  This broadcast receiving apparatus has a reception function based on a diversity system such as space diversity, for example, and a tuner that selects a radio wave of a preselected broadcast station from a broadcast radio wave received by an antenna 5 having the same function as the antenna 2. 6 and an OFDM demodulation slave unit 7 for demodulating a signal obtained by this channel selection. The OFDM demodulation slave unit 7 is connected to the OFDM demodulation master unit 4. The OFDM demodulation master unit 4 synthesizes and demodulates the signal detected by itself and the signal detected by the OFDM demodulation slave unit 7 and then normal broadcast processor. Output to 1.

  The normal broadcast processor 1 includes a Transport Stream Demultiplexing Processor (TSP) 11. This TSP 11 inputs an HDTV system signal included in the signal input from the OFDM demodulation master unit 4, separates this signal into an image signal and an audio signal compressed by the MPEG system, and performs viewing restriction. A descrambling process is performed on the received signal.

  The normal broadcast processor 1 also includes an MPEG processing unit 12 that decodes the image signal separated by the TSP 11, a DSP (Digital Signal Processor) 13 that decodes the audio signal separated by the TSP 11, and an MPEG processing unit 12. Decoded by the scaling unit 14 that converts the size of the image represented by the signal decoded by the above to a desired size, the OSD (On Screen Display) 15 that superimposes character information and the like on the decoded image, and the MPEG processing unit 12 An NTSC processing unit 16 is provided for encoding the signal into an NTSC video signal. The normal broadcast processor 1 is connected to the B-CAS card 21 and the DRAM 22.

  The broadcast receiving apparatus shown in FIG. 1 includes a simplified broadcast processor 31 that performs a decoding process on a one-segment signal included in a broadcast radio wave from a broadcast station. The processor 31 inputs a one-segment signal from the OFDM demodulation master unit 4 and converts the signal into MPEG4 or H.264. And a TSP 32 that separates into an image signal and an audio signal compressed by a simple moving picture system such as H.264, and a one-segment decoder unit 33 that performs a decoding process on the image signal and the audio signal separated by the TSP 32. The simple broadcast processor 31 has a wider operable temperature range and less power consumption than the normal broadcast processor 1 that performs HDTV signal decoding.

  The simple broadcast processor 31 is connected to a temperature sensor 34 that measures the current temperature and a remote control light receiving unit 35 that receives infrared signals from a remote controller (not shown) that performs various operations on the broadcast receiver. . The temperature measured by the temperature sensor 34 is normally the vicinity temperature (ambient temperature) of the broadcast processor 1.

  When the signal input via the remote control light receiving unit 35 is a control signal related to the processing of the normal broadcast processor 1, the simple broadcast processor 31 outputs the signal to the normal broadcast processor 1. Although not shown, the simple broadcast processor 31 is connected to each part device such as the tuner 3 and outputs an operation control signal to each part device according to a signal from the remote control light receiving part 35.

  Image signals output from the normal broadcast processor 1 and the simple broadcast processor 31 are output to the image output processing unit 41 via the signal selection units 36 and 37. The image output processing unit 41 includes a DAC (D / A converter) 42 that converts a digital video signal into an analog video signal, and a video signal processing unit 43 that performs processing such as level conversion and YC mixing. Therefore, the composite or component image signal is output to the display unit (monitor) 44.

  The audio signals output from the normal broadcast processor 1 and the simple broadcast processor 31 are output to the audio output unit (speaker) 46 through D / A conversion, amplification processing, and the like by the audio processing unit 45.

  A power supply circuit 51 provided in the broadcast receiving apparatus is connected to a power plug 52. The power supply circuit 51 connects the power plug 52 to an external power supply, that is, a commercial power supply outlet, stabilizes the power supply voltage when an operation for turning on the power supply is performed by the remote control, and supplies power necessary for each device. Transform to voltage and supply to each device. The power supply circuit 51 is connected to the battery 53. When an external power supply cannot be obtained via the power plug 52, the power supply circuit 51 obtains power from the battery 53 and supplies it to each device.

  The power supply circuit 51 is connected to a power supply state detection unit 54 that detects whether or not external power is supplied, and a remaining amount detection unit 55 that detects the remaining amount of battery power capacity of the battery 53. More specifically, since the power supply voltage of the external power supply and the power supply voltage of the battery 53 are different, the power supply state detection unit 54 detects the value of the power supply voltage supplied to the power supply circuit 51 and the external power supply is supplied. Detect whether or not. Detection results by the power supply state detection unit 54 and the remaining amount detection unit 55 are output to the simple broadcast processor 31.

  The broadcast receiving apparatus shown in FIG. 1 has a function of receiving an analog broadcast. Specifically, antennas 61 and 62 that receive analog broadcast radio waves, broadcast radio waves received by the antenna 61, and signals included in radio waves with high reception intensity among signals included in the broadcast radio waves received by the antenna 62. A diversity circuit 63, a tuner 64, an IF processing unit 65, an image processing unit 66, and a sound multiple demodulation unit 67. The image processing unit 66 is a digital NTSC video decoder including a YC separation unit 68 and a color signal processing unit 69.

Next, the operation of the broadcast receiving apparatus having the configuration shown in FIG. 1 will be described. Here, the reception and decoding processing related to digital broadcasting will be described.
A user performs an operation for receiving HDTV broadcasting using various keys on the remote controller, and a control signal in accordance with the operation is sent to the normal broadcast processor via the remote control light receiving unit 35 and the simple broadcast processor 31. 1, the processor 1 decodes the HDTV system signal input from the OFDM demodulation master unit 4, and the image signal and audio signal obtained as a result of the decoding process are output to the image output processing unit 41 and the audio processing unit. To the unit 45. In this case, the simple broadcast processor 31 does not input a signal from the OFDM demodulation master unit 4 and therefore does not perform a decoding process.

  By the processing by the normal broadcast processor 1, the image information included in the HDTV signal is displayed on the display unit 44, and the audio information included in the HDTV signal is output from the audio output unit 46.

  Further, the user performs an operation for receiving a one-segment broadcast using various keys of the remote controller, and a control signal according to this operation is input to the remote controller light receiving unit 35 and the simple broadcast processor 31. The processor 31 decodes the one-segment signal input from the OFDM demodulation master unit 4 and outputs the image signal and audio signal obtained as a result of the decoding process to the image output processing unit 41 and the audio processing unit 45. To do. In this case, the normal broadcast processor 1 does not input a signal from the OFDM demodulation master unit 4 and therefore does not perform HDTV decoding.

  By the processing of the processor 31 for simple broadcasting, the image information included in the one-segment signal is displayed on the display unit 44, and the sound information included in the one-segment signal is also output from the sound output unit 46.

  As described above, in the broadcast receiving apparatus according to the embodiment of the present invention, the processor that decodes the HDTV signal and the processor that decodes the one-segment signal are independent, and one segment Since the power consumption of the simple broadcast processor 31 that performs the decoding process of the system signal is less than the power consumption of the normal broadcast processor 1 that performs the decoding process of the HDTV system signal, it is possible to view the broadcast for a long time when the battery is driven. Is possible.

  The operable temperature range of the simple broadcast processor 31 is larger than the operable temperature range of the normal broadcast processor 1. Assume that a processor with a narrow operable temperature range that decodes HDTV signals has a one-segment signal decoding function, and the current temperature is outside the operable temperature range of the one-chip processor. In this case, there is a possibility that the decoding process of the HDTV signal cannot be normally performed even in the decoding process of the HDTV signal, but it is independent of the processor that performs the decoding process of the HDTV signal and operates. If the simple broadcast processor 31 having a wide possible temperature range is used, the one-segment decoding process can be continued. Therefore, it is possible to expand the viewing conditions for digital broadcasting.

  The broadcast receiving apparatus according to the embodiment of the present invention has a function of switching a signal to be decoded between an HDTV signal and a one-segment signal according to the operating temperature.

FIG. 2 is a flowchart showing an example of the playback switching process according to the operating temperature of the broadcast receiving apparatus according to the embodiment of the present invention.
First, the user performs an operation for receiving HDTV broadcasting using various keys of the remote controller, and a control signal according to this operation is input to the remote control light receiving unit 35 and the simple broadcast processor 31 ( In step S1), the processor 31 acquires the current temperature information of the normal broadcast processor 1 measured by the temperature sensor 34 (step S2). At this time, the normal broadcast processor 1 and the simplified broadcast processor 31 do not input signals from the OFDM demodulation master unit 4.

  The simple broadcast processor 31 stores information on the operable temperature range of the normal broadcast processor 1. The simple broadcast processor 31 compares the current temperature information acquired in step S2 with the information on the operable temperature range described above, and the current temperature is within the operable temperature range of the normal broadcast processor 1. It is determined whether or not there is (step S3).

  As a result of the processing in step S3, when it is determined that the current operating temperature of the normal broadcast processor 1 is included in the operable temperature range of the normal broadcast processor 1, the simple broadcast processor 31 The broadcast processor 1 is instructed to start decoding by outputting a control signal. In this case, the simple broadcast processor 31 does not input a signal from the OFDM demodulation master unit 4.

  The normal broadcast processor 1 decodes the HDTV system signal input from the OFDM demodulation master unit 4 in accordance with an instruction from the simple broadcast processor 31, and outputs an image signal and an audio signal obtained as a result of the decoding process as an image. It outputs to the process part 41 and the audio | voice process part 45 (step S4).

  On the other hand, if it is determined that the current operating temperature of the normal broadcast processor 1 is not included in the operable temperature range of the normal broadcast processor 1 as a result of the process of step S3, the simplified broadcast processor 31 In this case, the normal broadcast processor 1 is not instructed to start the decoding process, and a 1-segment signal is input from the OFDM demodulation master unit 4 to decode the signal. The audio signal is output to the image output processing unit 41 and the audio processing unit 45 (step S5). In this case, the normal broadcast processor 1 does not input a signal from the OFDM demodulation master unit 4. Here, it is assumed that the temperature measured by the temperature sensor 34 is a temperature within the operable temperature range of the simple broadcast processor 31.

  After the processing in step S4 or S5, the reproduction may be continued without performing further temperature measurement, or the temperature measurement is performed again by returning to the processing in step S2, and the broadcasting mode is switched again according to the measurement result. You may do it.

  If such a process is performed, if the operating temperature of the normal broadcast processor 1 is not included in the predetermined range, the normal broadcast processor 1 does not perform the decoding process, but instead, the simple broadcast processor. Since the decoding process according to 31 is performed, broadcast viewing can be continued even if the current temperature is a temperature at which the HDTV signal cannot be decoded. Therefore, it is possible to extend the temperature range in which digital broadcast viewing can be performed.

  In addition, the broadcast receiving apparatus according to the embodiment of the present invention determines whether a signal to be decoded is between an HDTV signal and a one-segment signal, depending on whether or not external power is supplied. It has a function to switch.

FIG. 3 is a flowchart showing an example of the playback switching process according to whether or not the external power supply is supplied, in the broadcast receiving apparatus according to the embodiment of the present invention.
First, the user performs an operation for receiving HDTV broadcasting using various keys of the remote controller, and a control signal according to this operation is input to the remote control light receiving unit 35 and the simple broadcast processor 31 ( In step A1), the processor 31 acquires information on the power supply state detected by the power supply state detection unit 54 (step A2). At this time, the normal broadcast processor 1 and the simplified broadcast processor 31 do not input signals from the OFDM demodulation master unit 4.

The simple broadcast processor 31 determines whether or not external power is supplied to the power supply circuit 51 in accordance with the information acquired in the process of step A2 (step A3).
As a result of the process of step A3, when it is determined that the external power supply is supplied, the simple broadcast processor 31 outputs a control signal to the normal broadcast processor 1 as in the process of step S4 described above. By doing so, an instruction to start the decoding process is given. In this case, the simple broadcast processor 31 does not input a signal from the OFDM demodulation master unit 4.

  The normal broadcast processor 1 decodes the HDTV system signal input from the OFDM demodulation master unit 4 in accordance with an instruction from the simple broadcast processor 31, and outputs an image signal and an audio signal obtained as a result of the decoding process as an image. It outputs to the process part 41 and the audio | voice process part 45 (step A4).

  On the other hand, as a result of the processing in step A3, when it is determined that the external power is not supplied and the apparatus is operating by the power supply from the battery 53, the simplified broadcast processor 31 determines that the above-described step S5 is performed. In the same manner as the above process, the normal broadcast processor 1 is not instructed to start the decoding process, and the signal of the one-segment method is input from the OFDM demodulation master unit 4 and then the signal is decoded. The image signal and audio signal obtained as a result of the decoding process are output to the image output processing unit 41 and the audio processing unit 45 (step A5). In this case, the normal broadcast processor 1 does not input a signal from the OFDM demodulation master unit 4.

  After the process of step A4 or A5, the reproduction may be continued without further detection of the power supply state, or the process returns to the process of step A2 to detect the power supply state again. Switching may be performed again.

  If such a process is performed, when the broadcast receiving apparatus is not driven by an external power supply and is operated by the power supply from the battery 53, the normal broadcast processor 1 does not perform the decoding process, but instead. Since the simple broadcast processor 31 with low power consumption performs the decoding process, the broadcast viewable time when the battery is driven can be extended.

  Moreover, the broadcast receiving apparatus according to the embodiment of the present invention is a modified example of the function according to the flowchart shown in FIG. 3 according to whether or not the external power supply is supplied and the remaining amount of the battery power capacity. And a function of switching a signal to be decoded between an HDTV signal and a one-segment signal.

FIG. 4 is a flowchart showing an example of the playback switching process according to the presence / absence of external power supply and the remaining battery level in the broadcast receiving apparatus according to the embodiment of the present invention.
First, the user performs an operation for receiving HDTV broadcasting using various keys of the remote controller, and a control signal according to this operation is input to the remote control light receiving unit 35 and the simple broadcast processor 31 ( In step B1), the processor 31 acquires information on the power supply state detected by the power supply state detection unit 54 (step B2). At this point, the normal broadcast processor 1 and the simplified broadcast processor 31 do not input signals from the OFDM demodulation master unit 4.

The simple broadcast processor 31 determines whether or not external power is supplied to the power supply circuit 51 in accordance with the information acquired in step A2 (step B3).
If it is determined that the external power is supplied as a result of the process in step B3, the simple broadcast processor 31 outputs a control signal to the normal broadcast processor 1 in the same manner as the process in step S4 described above. By doing so, an instruction to start the decoding process is given. In this case, the simple broadcast processor 31 does not input a signal from the OFDM demodulation master unit 4.

  The normal broadcast processor 1 decodes the HDTV system signal input from the OFDM demodulation master unit 4 in accordance with an instruction from the simple broadcast processor 31, and outputs an image signal and an audio signal obtained as a result of the decoding process as an image. It outputs to the process part 41 and the audio | voice process part 45 (step B4).

  On the other hand, if it is determined that the external power is not supplied as a result of the process of step B3, that is, the device is operating by the power supply from the battery 53, the simplified broadcast processor 31 detects the remaining amount. Information on the remaining battery level detected by the unit 55 is acquired (step B5).

  The simple broadcast processor 31 stores a reference value for the remaining battery level in advance. The simple broadcast processor 31 compares the current remaining battery power capacity acquired in step B5 and the reference value for the remaining battery power, and the remaining battery power capacity is equal to or less than the reference value. Is determined (step B6).

  As a result of the process in step B6, if it is determined that the current remaining battery level exceeds the reference value, the process proceeds to step B4. On the other hand, if it is determined as a result of the process of step B6 that the current remaining battery level is equal to or less than the reference value, the simple broadcast processor 31 performs the normal broadcast processor 1 in the same manner as the process of step S5 described above. 1 is input from the OFDM demodulation master unit 4 without instructing the start of the decoding process, and this signal is decoded, and the image signal and audio signal obtained as a result of the decoding process are output to the image. Output to the unit 41 and the voice processing unit 45 (step B7). In this case, the normal broadcast processor 1 does not input a signal from the OFDM demodulation master unit 4.

  After the process of step B4 or B5, the reproduction may be continued without further detection of the power supply state, or the process returns to the process of step B2 to detect the power supply state again. The amount may be detected again, and the broadcast mode may be switched again according to the detection result.

  If such a process is performed, the remaining battery level is equal to the reference value even when the broadcast receiving apparatus is driven by the power supply from the battery 53 as compared with the process according to the flowchart shown in FIG. If not, the normal broadcast processor 1 performs the decoding process. If the remaining battery level is less than the reference value, the normal broadcast processor 1 is used instead of the normal broadcast processor 1 for simple broadcasting. Since the decoding process by the processor 31 is performed, even when the battery is driven, when the remaining battery capacity is sufficient, HDTV broadcast viewing can be performed. Therefore, it is possible to improve convenience after extending viewing conditions.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The block diagram which shows the structural example of the broadcast receiving apparatus according to embodiment of this invention. The flowchart which shows an example of the reproduction | regeneration switching process according to the magnitude of operating temperature of the broadcast receiving apparatus according to embodiment of this invention. The flowchart which shows an example of the reproduction | regeneration switching process according to the presence or absence of supply of an external power supply of the broadcast receiving apparatus according to embodiment of this invention. The flowchart which shows an example of the reproduction | regeneration switching process according to the presence or absence of supply of an external power supply, and the magnitude | size of a battery remaining charge of the broadcast receiver according to embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Normal broadcast processor, 2, 5 ... Antenna, 3, 6 ... Tuner, 4 ... OFDM demodulation master part, 7 ... OFDM demodulation slave part, 31 ... Simple broadcast processor, 34 ... Temperature sensor, 35 ... Remote control light-receiving part , 41 ... Image output processing section, 42 ... DAC (D / A converter), 43 ... Video signal processing section, 44 ... Display section, 45 ... Audio processing section, 46 ... Audio output section, 51 ... Power supply circuit, 52 ... Power supply Plug, 53... Battery, 54... Power state detector, 55.

Claims (5)

A receiving channel selection unit that receives and selects digital broadcasting radio waves,
A first signal processing circuit for processing a signal having a first bandwidth included in the broadcast radio wave selected for reception;
Processes a signal that consumes less power than the first signal processing circuit and has a second bandwidth narrower than the first bandwidth, which is included in the broadcast radio wave selected for reception. And a second signal processing circuit. A receiving channel selection unit that receives and selects digital broadcasting radio waves,
A first signal processing circuit for processing a signal having a first bandwidth included in the broadcast radio wave selected for reception;
A signal having a wide operable temperature range as compared with the first signal processing circuit and having a second bandwidth narrower than the first bandwidth included in the broadcast radio wave selected for reception. And a second signal processing circuit for processing the broadcast receiving apparatus. Instruction means for instructing one of processing by the first signal processing circuit and processing by the second signal processing circuit;
Measuring means for measuring an operating temperature of the first signal processing circuit;
If the measured temperature is outside the operable temperature range of the first signal processing circuit, the first signal can be used even if the instruction means instructs the processing by the first signal processing circuit. 3. The broadcast receiving apparatus according to claim 2, further comprising control means for controlling so that processing by the processing circuit is not performed, and instead processing by the second signal processing circuit is performed. . A receiving channel selection unit that receives and selects digital broadcasting radio waves,
A first signal processing circuit for processing a signal having a first bandwidth included in the broadcast radio wave selected for reception;
Processes a signal that consumes less power than the first signal processing circuit and has a second bandwidth narrower than the first bandwidth, which is included in the broadcast radio wave selected for reception. A second signal processing circuit that
Instruction means for instructing one of processing by the first signal processing circuit and processing by the second signal processing circuit;
A power supply circuit for supplying driving power to the first and second signal processing circuits;
Power detection means for detecting whether or not external power is supplied to the power circuit;
When it is detected by the power supply detection means that external power is not supplied to the power supply circuit, the first signal processing circuit is instructed by the instruction means even when the first signal processing circuit is instructed. A broadcast receiving apparatus comprising: control means for controlling so that processing by the second signal processing circuit is performed instead of processing by the signal processing circuit. A receiving channel selection unit that receives and selects digital broadcasting radio waves,
A first signal processing circuit for processing a signal having a first bandwidth included in the broadcast radio wave selected for reception;
Processes a signal that consumes less power than the first signal processing circuit and has a second bandwidth narrower than the first bandwidth, which is included in the broadcast radio wave selected for reception. A second signal processing circuit that
Instruction means for instructing one of processing by the first signal processing circuit and processing by the second signal processing circuit;
A power supply circuit for supplying driving power to the first and second signal processing circuits;
Power detection means for detecting whether or not external power is supplied to the power circuit;
Means for detecting the value of the remaining amount of power of the battery when it is detected by the power supply detection means that external power is not supplied to the power supply circuit and power is supplied from the battery;
If the detected remaining power value does not satisfy a predetermined condition, the first signal processing is performed even when the instruction means instructs the processing by the first signal processing circuit. A broadcast receiving apparatus, comprising: a control unit configured to prevent processing by a circuit from being performed, and to control to perform processing by the second signal processing circuit instead.

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