JP5489199B2 - Digital broadcast receiving apparatus and program - Google Patents

Description

  The present invention relates to a digital broadcast receiving apparatus, and more particularly to a digital broadcast receiving apparatus and a program for receiving a digital broadcast in which a program having the same content is broadcast on a weak hierarchy and a strong hierarchy by hierarchical transmission.

  Japanese terrestrial digital broadcasting employs an ISDB-T (Integrated Services Digital Broadcasting for Terrestrial) system as a transmission system. In the ISDB-T system, it is possible to divide the transmission band of one channel into 13 segments and change the transmission parameters in units of each segment. In addition, hierarchical transmission of up to three layers can be performed.

  Currently, broadcasting for fixed receiving terminals (hereinafter referred to as “weak hierarchy”) and broadcasting for portable receiving terminals (hereinafter referred to as “strong hierarchy”) are performed using this hierarchical transmission. The simulcast that broadcasts these programs occupies the majority. Here, the weak layer has a large transmission capacity and high quality content (high image quality, high sound quality), but the noise resistance is relatively weak, while the strong layer has a small transmission capacity and low quality content (low image quality, Low sound quality), but is characterized by relatively high noise resistance.

  By the way, when a terrestrial digital broadcast is received by a mobile body such as an in-vehicle device or a portable terminal, the reception state of the broadcast radio wave changes every moment according to the movement. For this reason, in a digital broadcast receiving apparatus that supports hierarchical transmission, for example, the error rate and electric field strength at the time of demodulating a digitally modulated signal are monitored for each hierarchy, and the reception status of the weak hierarchy when receiving a weak hierarchy There is a known method of switching to a strong layer with relatively high noise resistance when it deteriorates and continuing reception, and when the reception status of the weak layer is improved when receiving a strong layer, switching to the weak layer and receiving. (For example, refer to Patent Document 1).

JP 2005-277873 A

  However, in the configuration disclosed in Patent Document 1, in order to switch from strong layer reception to weak layer reception, a tuner or demodulator for weak layer is used to constantly monitor the reception state of the weak layer during strong layer reception. There is a problem that the processing unit needs to be activated and power consumption increases.

  The present invention has been made in view of the above problems, and during the strong layer reception, the tuner for the weak layer and the demodulation processing unit are intermittently operated to efficiently monitor the reception state of the weak layer, An object of the present invention is to provide a digital broadcast receiving apparatus and a program capable of switching from strong layer reception to weak layer reception while suppressing power consumption.

In order to achieve the above object, a digital broadcast receiving apparatus according to the first aspect of the present invention provides:
A digital broadcast receiving apparatus that receives a digital broadcast signal in which a program having the same content by hierarchical transmission is broadcast on a weak hierarchy that is weak in noise resistance and a strong hierarchy that is strong in noise resistance,
A signal quality measurement unit for measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding unit that extracts the weak layer signal constituting the weak layer from the digital broadcast signal and decodes the weak layer signal;
A strong layer signal decoding unit that extracts the strong layer signal constituting the strong layer from the digital broadcast signal and decodes the strong layer signal;
A signal reproducing unit that reproduces either the decoded weak layer signal or the strong layer signal;
A position measurement unit that measures the movement amount and movement speed of a user who uses the device,
When the movement amount and / or the movement speed is less than a predetermined threshold, the signal reproduction unit continues reproduction of the strong layer signal,
Before SL when the movement amount and / or the moving speed is equal to or greater than a predetermined threshold value, the signal quality measurement unit, the signal quality is determined whether satisfies a predetermined quality,
When the signal quality satisfies a predetermined quality, the signal reproduction unit stops reproduction of the strong layer signal and reproduces the weak layer signal, and when the signal quality does not satisfy the predetermined quality, the weak layer Stop the operation of the signal decoding unit,
It is characterized by that.

  The signal quality measurement unit may determine whether the signal quality satisfies a predetermined quality when the strong layer signal is reproduced.

A timer unit for measuring the timer time, and
The position measurement unit may start measuring the movement amount and the movement speed when the timer time counted by the timer unit reaches a predetermined time.

  The predetermined time may be set to be smaller as the movement amount and / or the movement speed is larger.

A digital broadcast receiver according to another aspect of the present invention provides:
A digital broadcast receiving apparatus that receives a digital broadcast signal in which a program having the same content by hierarchical transmission is broadcast on a weak hierarchy that is weak in noise resistance and a strong hierarchy that is strong in noise resistance,
A weak layer signal decoding unit that extracts the weak layer signal constituting the weak layer from the digital broadcast signal and decodes the weak layer signal;
A strong layer signal decoding unit that extracts the strong layer signal constituting the strong layer from the digital broadcast signal and decodes the strong layer signal;
A signal quality measuring unit for measuring the signal quality indicated by the decoded weak layer signal and strong layer signal;
A signal reproducing unit for reproducing either the weak hierarchical signal or the strong hierarchical signal;
A position measurement unit that measures the movement amount and movement speed of a user who uses the device,
The signal quality measurement unit determines whether or not the signal quality indicated by the strong layer signal satisfies a predetermined strong layer quality when the strong layer signal is being reproduced,
The position measurement unit determines whether the movement amount and / or the movement speed is equal to or higher than a predetermined threshold when it is determined that the signal quality indicated by the strong hierarchy signal satisfies the predetermined strong hierarchy quality. Judgment,
When the movement amount and / or the movement speed is less than a predetermined threshold, the signal reproduction unit continues reproduction of the strong layer signal,
If the previous SL amount of movement and / or the moving speed is equal to or more than the predetermined threshold value, the signal quality measurement unit, the signal quality indicated by the weak layer signal it is determined whether or not satisfy a predetermined weak hierarchical quality ,
When the signal quality indicated by the weak hierarchy signal satisfies the predetermined weak hierarchy quality, the signal reproduction unit stops reproducing the strong hierarchy signal and reproduces the weak hierarchy signal, and indicates the weak hierarchy signal. If the signal quality to be satisfied does not satisfy the predetermined weak layer quality, the operation of the weak layer signal decoding unit is stopped,
It is characterized by that.

A digital broadcast receiver according to another aspect of the present invention provides:
A digital broadcast receiving apparatus that receives a digital broadcast signal in which a program having the same content by hierarchical transmission is broadcast on a weak hierarchy that is weak in noise resistance and a strong hierarchy that is strong in noise resistance,
A signal quality measurement unit for measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding unit that extracts the weak layer signal constituting the weak layer from the digital broadcast signal and decodes the weak layer signal;
A strong layer signal decoding unit that extracts the strong layer signal constituting the strong layer from the digital broadcast signal and decodes the strong layer signal;
A signal reproducing unit that reproduces either the decoded weak layer signal or the strong layer signal;
A position measurement unit that measures position information indicating the position of the device itself;
A storage unit that associates and stores the position information and the number and / or rate of signal quality indicated by the weak hierarchical signal at the position that satisfies a predetermined quality;
The signal quality measurement section, when the strong layer signal is being reproduced, the number and / or the percentage associated with the position of the own apparatus determines whether more than a predetermined threshold value, the own device If the number of times and / or the ratio associated with the position is equal to or higher than a predetermined threshold, it is determined whether or not the signal quality indicated by the weak hierarchical signal satisfies a predetermined quality,
When the signal quality indicated by the weak layer signal satisfies the predetermined quality, the signal reproduction unit stops reproduction of the strong layer signal and reproduces the weak layer signal, and the signal indicated by the weak layer signal When the quality does not satisfy the predetermined quality, the operation of the weak layer signal decoding unit is stopped.
It is characterized by that.

A digital broadcast receiver according to another aspect of the present invention provides:
A digital broadcast receiving apparatus that receives a digital broadcast signal in which a program having the same content by hierarchical transmission is broadcast on a weak hierarchy that is weak in noise resistance and a strong hierarchy that is strong in noise resistance,
A signal quality measurement unit for measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding unit that extracts the weak layer signal constituting the weak layer from the digital broadcast signal and decodes the weak layer signal;
A strong layer signal decoding unit that extracts the strong layer signal constituting the strong layer from the digital broadcast signal and decodes the strong layer signal;
A signal reproducing unit that reproduces either the decoded weak layer signal or the strong layer signal;
An outdoor determination unit that determines whether or not the position of the own device is outdoors,
When it is determined that the position of the device is not outdoors when the strong layer signal is being reproduced, the signal reproduction unit continues the reproduction of the strong layer signal,
When prior SL strong layer signal is being reproduced, when the position of the own device is determined to be outdoors, the signal quality measurement unit, the signal quality indicated by the weak layer signal satisfies a predetermined quality Whether or not
When the signal quality indicated by the weak layer signal satisfies the predetermined quality, the signal reproduction unit stops reproduction of the strong layer signal and reproduces the weak layer signal, and the signal indicated by the weak layer signal When the quality does not satisfy the predetermined quality, the operation of the weak layer signal decoding unit is stopped.
It is characterized by that.

The position measuring unit for measuring position information indicating the position of the device;
A map storage unit for storing a map showing the position of the device and indoor and outdoor positions;
It is also possible to further include an outdoor determination unit that compares the position of the own apparatus with the indoor and outdoor positions and determines whether the position of the own apparatus is outdoors.

A digital broadcast receiver according to another aspect of the present invention provides:
A digital broadcast receiving apparatus that receives a digital broadcast signal in which a program having the same content by hierarchical transmission is broadcast on a weak hierarchy that is weak in noise resistance and a strong hierarchy that is strong in noise resistance,
A signal quality measurement unit for measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding unit that extracts the weak layer signal constituting the weak layer from the digital broadcast signal and decodes the weak layer signal;
A strong layer signal decoding unit that extracts the strong layer signal constituting the strong layer from the digital broadcast signal and decodes the strong layer signal;
A signal reproducing unit that reproduces either the decoded weak layer signal or the strong layer signal;
A wireless communication unit that performs wireless communication with a plurality of base stations;
A communication quality measuring unit that measures the communication quality indicated by the wireless communication,
If the base station with which the wireless communication unit performs wireless communication is not changed when the strong layer signal is being reproduced, or if the communication quality satisfies a predetermined quality, the signal reproduction unit Continue playing,
When prior SL strong layer signal is being reproduced, the radio communication unit has changed the base station for performing radio communication, or, if the communication quality does not satisfy a predetermined communication quality, the signal quality measurement section , the signal quality indicated by the weak layer signal it is determined whether or not satisfy a predetermined quality,
When the signal quality indicated by the weak layer signal satisfies the predetermined quality, the signal reproduction unit stops reproduction of the strong layer signal and reproduces the weak layer signal, and the signal indicated by the weak layer signal When the quality does not satisfy the predetermined quality, the operation of the weak layer signal decoding unit is stopped.
It is characterized by that.

A digital broadcast receiver according to another aspect of the present invention provides:
A digital broadcast receiving apparatus that receives a digital broadcast signal in which a program having the same content by hierarchical transmission is broadcast on a weak hierarchy that is weak in noise resistance and a strong hierarchy that is strong in noise resistance,
A signal quality measurement unit for measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding unit that extracts the weak layer signal constituting the weak layer from the digital broadcast signal and decodes the weak layer signal;
A strong layer signal decoding unit that extracts the strong layer signal constituting the strong layer from the digital broadcast signal and decodes the strong layer signal;
A signal reproducing unit that reproduces either the decoded weak layer signal or the strong layer signal;
And a outdoor-format tough to determine constant whether the outdoor position of the own apparatus,
When it is determined that the position of the own device is indoors , the signal reproduction unit stops reproducing the weak layer signal and reproduces the strong layer signal, and determines that the position of the own device is outdoors. If it is, causes continued operation of the weak layer signal decoding unit,
It is characterized by that.

A program according to another aspect of the present invention is:
A program having the same content by hierarchical transmission is a program executed by a computer that receives a digital broadcast signal that is broadcast in a weak hierarchy weak in noise resistance and a strong hierarchy strong in noise resistance,
In the computer,
A signal quality measurement step of measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding step of taking out the weak layer signal constituting the weak layer from the digital broadcast signal and decoding the weak layer signal;
A strong layer signal decoding step of extracting the strong layer signal constituting the strong layer from the digital broadcast signal and decoding the strong layer signal;
A signal reproducing step of reproducing either the weak layer signal or the strong layer signal decoded;
And a position measuring step for measuring a moving amount and a moving speed of a user who uses the device,
When the movement amount and / or the movement speed is less than a predetermined threshold, in the signal reproduction step, the reproduction of the strong layer signal is continued.
Before SL when the movement amount and / or the moving speed is equal to or larger than a predetermined threshold, in the signal quality measurement step, the signal quality is determined whether satisfies a predetermined quality,
In the signal reproduction step, when the signal quality satisfies a predetermined quality, the reproduction of the strong layer signal is stopped to reproduce the weak layer signal, and when the signal quality does not satisfy the predetermined quality, the weak layer Stop the signal decoding process,
It is characterized by that.

A program according to another aspect of the present invention is:
A program having the same content by hierarchical transmission is a program executed by a computer that receives a digital broadcast signal that is broadcast in a weak hierarchy weak in noise resistance and a strong hierarchy strong in noise resistance,
In the computer,
A weak layer signal decoding step of taking out the weak layer signal constituting the weak layer from the digital broadcast signal and decoding the weak layer signal;
A strong layer signal decoding step of extracting the strong layer signal constituting the strong layer from the digital broadcast signal and decoding the strong layer signal;
A signal quality measuring step of measuring the signal quality indicated by the decoded weak layer signal and the strong layer signal;
A signal reproduction step of reproducing either the weak layer signal or the strong layer signal;
And a position measuring step for measuring a moving amount and a moving speed of a user who uses the device,
In the signal quality measurement step, when the strong layer signal is being reproduced, it is determined whether or not the signal quality indicated by the strong layer signal satisfies a predetermined strong layer quality,
In the position measurement step, if it is determined that the signal quality indicated by the strong layer signal satisfies the predetermined strong layer quality, whether or not the movement amount and / or the moving speed is equal to or higher than a predetermined threshold value. Judgment,
When the movement amount and / or the movement speed is less than a predetermined threshold, the signal reproduction step continues the reproduction of the strong layer signal,
If the previous SL amount of movement and / or the moving speed is equal to or more than the predetermined threshold value, in the signal quality measurement step, the signal quality indicated by the weak layer signal it is determined whether or not satisfy a predetermined weak hierarchical quality ,
In the signal reproduction step, when the signal quality indicated by the weak hierarchy signal satisfies the predetermined weak hierarchy quality, the reproduction of the strong hierarchy signal is stopped and the weak hierarchy signal is reproduced, and is indicated by the weak hierarchy signal. Stopping the weak layer signal decoding process if the signal quality to be satisfied does not satisfy the predetermined weak layer quality,
It is characterized by that.

A program according to another aspect of the present invention is:
A program having the same content by hierarchical transmission is a program executed by a computer that receives a digital broadcast signal that is broadcast in a weak hierarchy weak in noise resistance and a strong hierarchy strong in noise resistance,
In the computer,
A signal quality measurement step of measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding step of taking out the weak layer signal constituting the weak layer from the digital broadcast signal and decoding the weak layer signal;
A strong layer signal decoding step of extracting the strong layer signal constituting the strong layer from the digital broadcast signal and decoding the strong layer signal;
A signal reproducing step of reproducing either the weak layer signal or the strong layer signal decoded;
A position measurement process for measuring position information indicating the position of the device itself;
A storage step of associating and storing the position information and the number and / or ratio of the signal quality indicated by the weak hierarchical signal at the position satisfying a predetermined quality;
In the signal quality measurement step, when the strong layer signal is being reproduced, the number and / or the percentage associated with the position of the own apparatus determines whether more than a predetermined threshold value, the own device If the number of times and / or the ratio associated with the position is equal to or higher than a predetermined threshold, it is determined whether or not the signal quality indicated by the weak hierarchical signal satisfies a predetermined quality,
In the signal reproduction step, when the signal quality indicated by the weak hierarchy signal satisfies the predetermined quality, the reproduction of the strong hierarchy signal is stopped to reproduce the weak hierarchy signal, and the signal indicated by the weak hierarchy signal If the quality does not satisfy the predetermined quality, stop the weak layer signal decoding step;
It is characterized by that.

A program according to another aspect of the present invention is:
A program having the same content by hierarchical transmission is a program executed by a computer that receives a digital broadcast signal that is broadcast in a weak hierarchy weak in noise resistance and a strong hierarchy strong in noise resistance,
In the computer,
A signal quality measurement step of measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding step of taking out the weak layer signal constituting the weak layer from the digital broadcast signal and decoding the weak layer signal;
A strong layer signal decoding step of extracting the strong layer signal constituting the strong layer from the digital broadcast signal and decoding the strong layer signal;
A signal reproducing step of reproducing either the weak layer signal or the strong layer signal decoded;
An outdoor determination step of determining whether or not the position of the own device is outdoors,
When it is determined that the position of the own device is not outdoors when the strong layer signal is being reproduced, the signal reproduction step continues the reproduction of the strong layer signal,
When prior SL strong layer signal is being reproduced, when the position of the own device is determined to be outdoors, and in the signal quality measurement step, the signal quality indicated by the weak layer signal satisfies a predetermined quality Whether or not
In the signal reproduction step, when the signal quality indicated by the weak hierarchy signal satisfies the predetermined quality, the reproduction of the strong hierarchy signal is stopped to reproduce the weak hierarchy signal, and the signal indicated by the weak hierarchy signal If the quality does not satisfy the predetermined quality, stop the weak layer signal decoding step;
It is characterized by that.

A program according to another aspect of the present invention is:
A program having the same content by hierarchical transmission is a program executed by a computer that receives a digital broadcast signal that is broadcast in a weak hierarchy weak in noise resistance and a strong hierarchy strong in noise resistance,
In the computer,
A signal quality measurement step of measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding step of taking out the weak layer signal constituting the weak layer from the digital broadcast signal and decoding the weak layer signal;
A strong layer signal decoding step of extracting the strong layer signal constituting the strong layer from the digital broadcast signal and decoding the strong layer signal;
A signal reproducing step of reproducing either the weak layer signal or the strong layer signal decoded;
A wireless communication step of performing wireless communication with a plurality of base stations;
A communication quality measurement step of measuring the communication quality indicated by the wireless communication, and
When the base station that performs the wireless communication is not changed when the strong layer signal is being reproduced, or when the communication quality satisfies a predetermined quality, in the signal reproduction step, the strong layer signal is reproduced. Continue,
When prior SL strong layer signal is being reproduced, previous base station that performs quinic line communication is changed, or, when the communication quality does not satisfy a predetermined communication quality, in the signal quality measurement process, the Determine whether the signal quality indicated by the weak hierarchical signal satisfies a predetermined quality,
In the signal reproduction step, when the signal quality indicated by the weak hierarchy signal satisfies the predetermined quality, the reproduction of the strong hierarchy signal is stopped to reproduce the weak hierarchy signal, and the signal indicated by the weak hierarchy signal If the quality does not satisfy the predetermined quality, stop the weak layer signal decoding step;
It is characterized by that.

A program according to another aspect of the present invention is:
A program having the same content by hierarchical transmission is a program executed by a computer that receives a digital broadcast signal that is broadcast in a weak hierarchy weak in noise resistance and a strong hierarchy strong in noise resistance,
In the computer,
A signal quality measurement step of measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding step of taking out the weak layer signal constituting the weak layer from the digital broadcast signal and decoding the weak layer signal;
A strong layer signal decoding step of extracting the strong layer signal constituting the strong layer from the digital broadcast signal and decoding the strong layer signal;
A signal reproducing step of reproducing either the weak layer signal or the strong layer signal decoded;
And outdoor determination Priority determination step of location of the device itself determine constant whether outdoors, is executed,
In the signal reproduction step, when it is determined that the position of the own device is indoors, the reproduction of the weak layer signal is stopped and the strong layer signal is reproduced, and the position of the own device is determined to be outdoors. If it is, causes continued the weak layer signal decoding step,
It is characterized by that.

  According to the present invention, when moving to a weak layer receivable area during strong layer reception, it is possible to switch from strong layer reception to weak layer reception while suppressing power consumption.

(Embodiment 1)
Hereinafter, one embodiment of the digital broadcast receiving apparatus of the present invention will be described. However, the embodiment is for facilitating understanding of the principle of the present invention, and the scope of the present invention is as follows. The present invention is not limited to the embodiments, and other embodiments in which those skilled in the art appropriately replace the configurations of the following embodiments are also included in the scope of the present invention.

  First, a description will be given with reference to FIG. 1 showing a schematic configuration of a typical mobile phone terminal 1 in which a digital broadcast receiving apparatus according to an embodiment of the present invention is realized. The present embodiment is an example in which a digital broadcast receiving device is applied to a mobile phone terminal 1 having a digital broadcast receiving function.

(Basic configuration of mobile phone terminal)
FIG. 1 is a functional configuration diagram of a mobile phone terminal 1 according to Embodiment 1 of the present invention. The mobile phone terminal 1 includes a control unit 11, a storage unit 12, an operation unit 13, a display unit 14, a one-segment tuner unit 15, a one-segment decoding unit 16, a full-segment tuner unit 17, a descrambling unit 18, a full-segment decoding unit 19, and an audio output unit. 20, a voice input unit 21, a communication unit 22, a position information acquisition unit 23, a timer unit 24, and a bus 25.

  The control unit 11 includes a CPU (Central Processing Unit), a microprocessor unit, and the like, and controls the overall operation of the mobile phone terminal 1 according to an operation program stored in a storage unit 12 described later. For example, it controls the channel change of the received digital broadcast and the reproduction of the received digital broadcast content. In addition, the control unit 11 causes the display unit 14 to display various data (for example, video, caption text, data broadcast, etc.).

  The storage unit 12 stores various data. For example, the storage unit 12 stores an operation control program for the control unit 11. The storage unit 12 may be configured by either a memory built in the mobile phone terminal 1 or a removable external memory.

  The operation unit 13 includes various keys or buttons such as a keyboard, cursor keys, and numeric keys, receives an operation from the user, and inputs an operation signal to the control unit 11.

  The display unit 14 includes a display panel such as a dot matrix type LCD (Liquid Crystal Display) panel, a driver circuit, and the like. Under the control of the control unit 11, arbitrary data (for example, video, caption, data broadcasting, etc.) ) Is displayed.

  The one seg tuner unit 15 demodulates the content of the one seg broadcast received via the antenna and outputs a demodulated signal to the one seg decode unit 16.

  A detailed configuration of the one-segment tuner unit 15 is shown in FIG. The one-segment tuner unit 15 includes an antenna 150, a field strength measuring device 151, a receiver 152, a demodulator 153, a BER measuring device 154, a field strength output line 155, a BER output line 156, a TS output line 157, and the like.

  The antenna 150 has a shape necessary for receiving a digital broadcast, for example, a radio wave in the UHF band or the VHF band.

  The electric field strength measuring device 151 obtains the electric field strength value in the state of receiving the digital broadcast and outputs it to the control unit 11 via the electric field strength output line 155.

  The receiver 152 outputs the signal input from the antenna 150 to the demodulator 153 at the subsequent stage as an RF signal.

  The demodulator 153 demodulates the signal input from the receiver 152 and outputs transport stream (hereinafter referred to as TS) data. Further, after the bit error rate (BER) value of the received signal is measured by the subsequent BER measuring device 154, TS is output from the TS output line 157. Further, the measured BER value is output to the control unit 11 via the BER output line 156.

  The BER measuring device 154 sequentially measures the BER of the received signal from the decoded bit string that is the output of the demodulator 153.

  The one seg decoding unit 16 decodes and outputs the content output by the one seg tuner unit 15. Includes video and audio decoders.

The full segment tuner unit 17 demodulates the content of the full segment broadcast received via the antenna, and outputs the demodulated signal to the descramble unit 18 described later.
Note that the detailed configuration of the full segment tuner unit 17 is the same as that of the one segment tuner unit 15, and thus description of each unit is omitted. A case where the one-segment tuner unit 15 and the full-segment tuner unit 17 are configured as one module is also conceivable.

  The descrambling unit 18 decrypts the scrambled content output from the full segment tuner unit 17 and outputs the data to the full segment decoding unit 19 in plain text.

  The full segment decoding unit 19 decodes and outputs the plaintext content output from the descrambling unit 18. Includes video and audio decoders.

  The audio output unit 20 includes a speaker, a DAC (Digital Analog Converter), and the like. For example, the audio output unit 20 performs DA conversion on the audio signal of the content reproduced by the control unit 11 and emits sound through the speaker.

  The voice input unit 21 includes a microphone or the like, collects voice signals during a call, and supplies the collected voice signals to the communication unit 22.

  The communication unit 22 transmits / receives call voice, various data, and the like via the wireless communication base station.

  The position information acquisition unit 23 acquires current position information of the mobile phone terminal 1 and includes, for example, a GPS device, an acceleration sensor, an electronic compass, and the like.

  The timer unit 24 is a mechanism attached to the microprocessor unit and the like, and generates interrupts at regular time intervals. A time interval at which the control unit 11 generates an interrupt can be set.

  The bus 25 transmits data between the units.

  The power supply unit (not shown) includes a battery, and the battery supplies power to the mobile phone terminal 1.

(Overview of switching process)
Next, processing for switching from full-segment broadcasting to one-segment broadcasting will be described with reference to FIG.

  When receiving a full-segment broadcast and watching it, if the reception state deteriorates due to movement or the like, block noise may occur in the video, and it may not be possible to continue watching more comfortably. In such a case, by switching to the one-seg broadcasting on the same channel and displaying it, the user can continue to watch the program, improving usability. In order to control in this way, it is necessary to acquire, for example, the received electric field strength and the BER value during reception of the full-segment broadcasting and determine whether or not it is larger than a predetermined threshold value. If it becomes smaller than the threshold value, the display is switched to the one-segment broadcasting.

  FIG. 3 shows a diagram in which the time change of the BER value acquired by the BER measuring device 154 of the full segment tuner unit 17 is plotted. Here, the threshold 140 indicates a value for switching from full segment broadcast reception to one segment broadcast reception when the BER value is larger than this.

  First, when the acquired BER value exceeds the threshold value 140 at time t1, switching processing to one-segment broadcasting is performed. Specifically, the control unit 11 first turns off the power of the full segment tuner unit 17. Then, the control unit 11 is activated by turning on the power of the one-segment tuner unit 15 and inputs the TS output from the one-segment tuner unit 15 to the one-segment decoding unit 16. The input TS is decoded by the one-segment decoding unit 16 and converted into YUV (luminance signal (Y), difference between luminance signal and blue component (U), difference between luminance signal and red component (V)) data, and display unit 14 is displayed.

  Further, when the value falls below the threshold 140 at time t2, a switching process to full segment broadcasting is performed. Specifically, the same processing as the switching processing to one-segment broadcasting is performed. First, the control unit 11 turns off the power of the one-segment tuner unit 15. Then, the control unit 11 turns on the full segment tuner unit 17 to start up, performs descrambling processing and decoding processing on the TS output from the full segment tuner unit 17, and displays the TS on the display unit 14. Thus, the switching process between the one-segment broadcasting and the full-segment broadcasting can be performed using the BER value of the full-segment broadcasting.

  Similarly, at the times t3 and t4, the threshold 140 is determined, and the switching process between the one-segment broadcasting and the full-segment broadcasting is performed.

  Here, when the switching determination process is performed using the BER value of full-segment broadcasting and the received electric field strength, the power consumption increases if the full-segment tuner unit 17 is always turned on. In general, the power consumption of the full segment tuner unit 17 is larger than that of the one segment tuner unit 15. This is because full-segment broadcasting uses a frequency band about 13 times that of one-segment broadcasting, and the TS bit rate is high and the amount of data to be processed is large.

  For this reason, in the present invention, the power of the full segment tuner unit 17 is not always turned on, but the power consumption of the full segment tuner unit 17 is turned on as necessary to suppress power consumption. The timing for turning on the full segment tuner unit 17 will be described later.

(Full segment video output processing)
Next, video output processing of full-segment broadcasting will be described with reference to FIG.

  First, the full segment tuner unit 17 receives radio waves of full segment broadcasting. Then, the full segment tuner unit 17 performs demodulation processing and outputs a full segment broadcast TS (step S11).

  Next, since the TS is scrambled for content protection, the descrambling unit 18 performs descrambling processing and outputs a plaintext TS (step S12).

  Then, the full segment decoding unit 19 performs a process of decoding the plaintext TS (step S13). In the decoding process, the TS is first separated into data such as video data, audio data, caption data, data broadcast, PSI / SI (Program Specific Information / Service Information) information, and then each elementary stream (ES) is decoded. Is done. As a result, the video ES is converted into YUV data.

  Finally, the control unit 11 displays the video data on the display unit 14 (step S14). The audio ES is converted into PCM (Pulse Code Modulation) data and output from the audio output unit 20.

(Details of switching process)
FIG. 5 is a flowchart showing digital broadcast reception processing of the mobile phone terminal 1 according to the first embodiment of the present invention. This digital broadcast receiving process is executed by the control unit 11 controlling the operation of the mobile phone terminal 1 according to a program stored in the storage unit 12, for example.

  First, when the mobile phone terminal 1 is turned on or the digital broadcast receiving function is activated, initialization processing is performed (step S101). For example, power is supplied to a circuit necessary for mobile phone communication, an animation notifying the user of activation of the digital broadcast reception function is displayed, and other applications that have been operating so far are terminated.

  Next, the control unit 11 controls the power supply unit to supply power to the full segment tuner unit 17, sets necessary startup parameters, etc., and enables the function (step S102).

  Subsequently, the control unit 11 confirms the reception state of the full segment broadcasting (step S103). Specifically, the control unit 11 acquires values such as BER and received radio wave intensity from the full segment tuner unit 17. Other values such as a packet error rate (PER) and a C / N ratio (Carrier to Noise Ratio) may be used.

  Then, the control unit 11 determines whether or not the full segment broadcast is being received by comparing with a predetermined threshold (step S104). This threshold value is a program variable stored in the storage unit 12 and can be acquired by accessing the storage unit 12. It may be set in a register on the hardware of the mobile phone terminal 1.

  When it is determined that the reception status of the full segment broadcast is good and the full segment broadcast can be received (step S104; Yes), the control unit 11 performs descrambling processing and decoding processing on the TS output from the full segment tuner unit 17, and displays the display unit. 14 (step S105).

  Thereafter, the process returns to step S103 to continuously check the reception status of the full segment broadcast. The reception status of the full segment broadcast may be confirmed every predetermined time by a timer process. While the reception status of the full segment broadcast is good, the full segment broadcast is continuously received and displayed.

  On the other hand, when it is determined that the reception status of the full segment broadcast is poor and reception of the full segment broadcast is not possible (step S104; No), the control unit 11 stops the power supply to the full segment tuner unit 17 (step S106), and the one segment tuner The power is supplied to the unit 15, the necessary startup parameters are set, and the function is enabled (step S107).

  Subsequently, the reception state of the one-segment broadcasting is confirmed (step S108). Specifically, the control unit 11 acquires values such as BER and received radio wave intensity from the one-segment tuner unit 15.

  Then, the control unit 11 determines whether or not the one-segment broadcasting is being received by comparing with a predetermined threshold value (step S109).

  When it is determined that the reception status of the one-segment broadcasting is good and the one-segment broadcasting can be received (step S109; Yes), the control unit 11 decodes the TS output from the one-seg tuner unit 15 and displays the TS on the display unit 14. (Step S110).

  On the other hand, when the reception state of the one-segment broadcast is poor and it is determined that the one-segment broadcast cannot be received (step S109; No), the control unit 11 displays a message indicating that the digital broadcast cannot be received on the display unit 14 ( Step S111), this flow processing is terminated.

  Next, when the control unit 11 receives the one-segment broadcast and displays the broadcast on the display unit 14, the control unit 11 controls the timer unit 24 to start timer measurement (step S112).

  And the control part 11 determines whether a certain time passed and the timer expired (step S113).

  The control unit 11 repeats the determination process until the timer expires (step S113; No).

  On the other hand, when it is detected that the timer has expired after a certain time has elapsed (step S113; Yes), the control unit 11 controls the position information acquisition unit 23 to acquire the current position information of the mobile phone terminal 1 (step S113). S114). As a position information acquisition method, for example, a signal transmitted from a plurality of GPS satellites is received, a distance from the GPS satellite is calculated from a difference between a signal transmission time and a reception time, and current position information is calculated therefrom. You can also. It is also possible to calculate the amount of movement by time integrating the acceleration value acquired from the acceleration sensor along each direction, and to calculate the position after movement.

  In addition, although the positional information acquisition process of the above-mentioned step S114 gave the positioning method using a GPS positioning or an acceleration sensor as an example, this is for determining whether there existed more than predetermined movement in step S115 mentioned later. Any other processing method may be used as long as it can be determined whether or not there has been a predetermined movement or more in step S115.

  For example, in position positioning such as GPS positioning, rough accuracy of about several meters to several tens of meters may be used. In addition, when the acceleration sensor is used, it is possible to identify a state indicating the intensity of exercise such as a stationary state or a walking state. Further, when an acceleration sensor is used, it can be regarded that “there is a movement of a predetermined amount or more” when a movement speed of a predetermined amount or more is detected instead of the movement distance. Further, when the mobile phone terminal 1 moves, the signal level received by the one-segment tuner unit 15 or the full-segment tuner unit 17 gradually increases or decreases, and this is used to change the received signal level fluctuation amount. Can be regarded as “there is more than a predetermined movement”.

  The one-segment tuner unit 15 and the full-segment tuner unit 17 regularly receive pilot signals from broadcasting stations, but are basically time-invariant while the terminal is stationary. However, when the mobile phone terminal 1 moves at a high speed, there is a difference between the timing at which the pilot signal is received and the timing at which the pilot signal is actually received if the mobile phone terminal 1 remains stationary. Using this fact, the time interval at which the one-segment tuner unit 15 and the full-segment tuner unit 17 receive the pilot signal varies to determine how much the time interval is larger than a predetermined level. It can be considered that there was a movement.

  In addition, when the mobile phone terminal 1 moves, the frequency of the received signal is shifted from the frequency at the time of transmission due to the Doppler effect. The center frequency of the original signal is determined in advance according to the channel selected by the one-segment tuner unit 15 or the full-segment tuner unit 17. Using this fact, the difference between the center frequency of the signal received by the one-segment tuner unit 15 or the full-segment tuner unit 17 and the center frequency of the original signal is seen. It can be considered that there was a movement.

  Next, when acquiring the current position information, the control unit 11 compares the difference from the previous position information with a predetermined threshold value to determine whether or not there has been a movement of a predetermined distance or more (step S115). .

  If there is no movement beyond the predetermined value (step S115; No), the control unit 11 returns to the timer measurement start process in step S112 while continuing the one-segment broadcast display performed in step S110.

  On the other hand, when there is a predetermined movement or more (step S115; Yes), the control unit 11 supplies power to the full segment tuner unit 17, sets necessary start-up parameters, etc., and enables the function (step S116). ).

  Subsequently, the control unit 11 confirms the reception state of the full segment broadcast (step S117).

Then, the control unit 11 determines whether or not the full segment broadcasting is being received by comparing with a predetermined threshold (step S118).
In addition, the process of step S116-step S118 is a process similar to step S102-step S104.

  When it is determined that the reception status of the full segment broadcast is good and the full segment broadcast can be received (step S118; Yes), the control unit 11 stops the power supply to the one-segment tuner unit 15 (step S119).

The control unit 11 performs descrambling processing and decoding processing on the TS output from the full segment tuner unit 17 and displays the TS on the display unit 14 (step S120).
Note that step S120 is the same process as step S105, and the same is true in that the process returns to step S103 and the reception status of the full segment broadcast is continuously confirmed after the process.

  On the other hand, when the reception state of the full segment broadcast is poor and it is determined that the full segment broadcast cannot be received (step S118; No), the control unit 11 stops the power supply to the full segment tuner unit 17 (step S121). While continuing the one-segment broadcasting display performed in step S110, the process returns to the timer measurement start process in step S112.

  As described above, by performing the full-seg broadcast reception status confirmation process intermittently, it is possible to automatically switch from the one-segment broadcast reception to the full-segment broadcast reception while keeping the power consumption of the mobile phone terminal 1 low. In particular, since the power consumption of the GPS receiving LSI and the acceleration sensor is generally lower than the power consumption of the full segment tuner LSI, the full segment tuner unit 17 is used only when it is detected that there is a predetermined movement or more by the determination in step S115. Power activation can be realized by not activating the full segment tuner unit 17 when activated and there is no movement beyond a predetermined level.

  On the other hand, the chance of executing the full-seg broadcast reception status confirmation process by the full-segment tuner unit 17 is reduced. However, if there is no movement beyond a predetermined value according to the determination in step S115, the full-seg broadcast reception status from the previous position measurement. Therefore, there is almost no problem that the timing of automatically switching from the one-segment broadcasting reception to the full-segment broadcasting reception is delayed because the full-segment broadcasting reception status confirmation processing by the full-segment tuner unit 17 is not executed. . As a result, the TV viewing time is extended, and the user convenience is improved.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described with reference to the flowchart of FIG.

The functional configuration of the mobile phone terminal 1 according to the second embodiment is the same as that shown in FIG.
Further, the processing from step S110 to step S121 and the processing up to step S110 (not shown) are the same as the processing of the same number in FIG.

  In the second embodiment, the power consumption is further reduced when the movement is small by changing the timer value according to the size of movement of the mobile phone terminal 1, and from the one-segment broadcast reception to the full-segment broadcast reception when the movement is large. Make sure that the switching timing is not delayed.

  That is, the timer value used in step S112 of the first embodiment is changed according to the magnitude of movement detected in step S115. The magnitude of movement referred to here is, for example, a value indicating the movement distance or the intensity of exercise calculated using an acceleration sensor.

  The difference from the first embodiment is that after step S115 and step S121, before returning to step S112, the timer value used in step S112 is updated according to the magnitude of movement of the mobile phone terminal 1 determined in step S115. This is the point that the process (step S201) is added.

  For example, if the moving distance determined in step S115 is larger than a predetermined threshold, the moving speed is fast, so it is highly likely that the reception status of full-segment broadcasting will change in a short time, and is used in step S112. Set a smaller timer value.

  Conversely, if the moving distance determined in step S115 is smaller than a predetermined threshold, the moving speed is slow, so it is unlikely that the reception status of the full segment broadcast will change in a short time, and in step S112 Set a large timer value to be used. The same applies to the case where a value indicating the intensity of exercise is used. Also, a plurality of threshold values used for comparison may be provided, and the timer value used in step S112 may be switched to a plurality of stages.

Thereby, by performing the reception status confirmation process of full-segment broadcasting intermittently, it is possible to automatically switch from receiving one-segment broadcasting to receiving full-segment broadcasting while suppressing the power consumption of the mobile phone terminal 1 low.
In addition, by changing the execution interval of the reception status confirmation processing of the full-segment broadcasting according to the size of the movement of the mobile phone terminal 1, the power consumption is further reduced when the movement is small, and the one-segment broadcasting is received when the movement is large. The timing for switching from full-segment broadcasting reception to delay can be prevented.

(Embodiment 3)
Next, Embodiment 3 of the present invention will be described with reference to the flowchart of FIG.

The functional configuration of the mobile phone terminal 1 according to the third embodiment is the same as that shown in FIG.
Further, the processing up to step S110 (not shown) and the processing after step S112 are the same as the processing of the same number in FIG.

  In the third embodiment, before performing the movement amount detection process, it is confirmed that the reception state of the one-segment broadcasting is very good, and the reception state of the one-segment broadcasting is not so good. When it is estimated that reception is not possible, the movement amount detection process is not performed.

  That is, before performing the movement detection process of steps S112 to S115 of the first embodiment, the movement detection of steps S112 to S115 is performed only when the reception state of the one-segment broadcasting is confirmed and the reception state of the one-segment broadcasting is very good. Processing is performed.

  The difference from the first embodiment is that the control unit 11 periodically checks the reception status of the one-segment broadcasting immediately after displaying the one-segment broadcasting (step S301), and whether the reception status of the one-segment broadcasting is very good. It is determined whether or not (step S302). For example, it is determined whether or not the BER of one-segment broadcasting is 0, and further whether or not the received radio wave intensity is greater than a predetermined threshold value.

  If it is determined that the reception state of the one-segment broadcasting is very good (step S302; Yes), the processing proceeds to step S112 and subsequent steps because there is a possibility that the full-segment broadcasting can be received. Note that the timing for confirming the reception status of the one-segment broadcasting in step S301 may be managed by a timer process or the like.

  On the other hand, when it is determined that the reception state of the one-segment broadcast is not very good (step S302; No), the control unit 11 confirms the reception state of the one-segment broadcast again (step S301).

  Thereby, by performing the reception status confirmation process of full-segment broadcasting intermittently, it is possible to automatically switch from receiving one-segment broadcasting to receiving full-segment broadcasting while suppressing the power consumption of the mobile phone terminal 1 low. Normally, it is difficult to satisfactorily receive full-segment broadcasting when the BER is not 0 in the demodulation processing of one-segment broadcasting. In addition, reception of full-segment broadcasting requires a higher C / N than when receiving one-segment broadcasting. Therefore, since the reception status of the one-segment broadcasting is confirmed to be very good before the movement amount detection process is performed, the reception status of the one-segment broadcasting is not so good, and the full-segment broadcasting cannot be received well in the same place. Since the movement amount detection process is not performed when estimated, the power consumption of the mobile phone terminal 1 can be further reduced.

(Embodiment 4)
Next, Embodiment 4 of the present invention will be described with reference to the flowcharts of FIGS.

The functional configuration of the mobile phone terminal 1 according to the fourth embodiment is almost the same as that shown in FIG.
Further, the processing from step S112 to step S116, the processing up to step S112 (not shown), and the processing after step S116 are the same as the processing of the same number in FIG.

The difference from the first embodiment is that the storage unit 12 holds the full-segment broadcast reception state confirmation history information 121. An example of the data structure of the full segment broadcast reception state confirmation history information 121 is shown in FIG. The full segment broadcast reception state confirmation history information 121 includes elements such as position information 1211, full segment reception state confirmation number 1212, full segment reception state good detection number 1213, full segment reception state good detection rate 1214, and the like.
Note that it is desirable that the full-segment broadcast reception state confirmation history information 121 can be returned to the initial state by a user operation.

  The position information 1211 is information indicating the position and area where the reception status confirmation processing of the full segment broadcasting is performed, and is configured by a combination of latitude / longitude information, distance information from a certain point, area information indicating which region the area belongs to, etc. Is done.

  The full segment reception state confirmation count 1212 represents the number of times that the full segment broadcast reception status confirmation processing is performed at the position or area indicated by the position information 1211.

  The full segment reception state good detection count 1213 represents the number of times that the reception state of the full segment broadcast is determined to be good as a result of the reception status confirmation processing of the full segment broadcast at the position or area indicated by the position information 1211. .

  The good detection rate 1214 of the full segment reception state represents a ratio at which the reception state of the full segment broadcast is determined to be good as a result of performing the reception state confirmation process of the full segment broadcast at the position or area indicated by the position information 1211. .

  FIG. 9 is a flowchart showing digital broadcast reception processing of the mobile phone terminal 1 according to the fourth embodiment of the present invention.

After acquiring the current position information of the mobile phone terminal 1 in step S114, the control unit 11 reads the full segment broadcast reception state confirmation history information 121 from the storage unit 12 (step S401).
In addition, the control part 11 performs update registration of the full segment broadcast reception status confirmation history information 121, when the full segment broadcast reception status confirmation process etc. are performed. The control unit 11 can make a determination based on the latest history information by reading the update-registered full-segment broadcast reception state confirmation history information 121 from the storage unit 12.

  Next, the control unit 11 determines whether or not there is a history that the reception state of the full-segment broadcasting is good at the current position of the mobile phone terminal 1 (step S402). As an example of the determination process here, the current position information acquired in step S114 is compared with the position information 1211 included in the full-segment broadcast reception state confirmation history information 121 read in step S401, and is closest to the current position. The position information 1211 is determined.

The control unit 11 can also read the full-segment reception state good detection count 1213 corresponding to the position information 1211 and make a determination based on whether the detection count is equal to or greater than a predetermined threshold.
Further, the control unit can read the good detection rate 1214 in the full segment reception state and determine based on whether the detection rate is equal to or higher than a predetermined threshold. In step S402, it is determined as Yes if it is equal to or greater than a predetermined threshold, and No if it is less than the predetermined threshold.

  When it is determined that there is a history that the reception state of the full segment broadcast is good at the current position or there are many histories (step S402; Yes), the process proceeds to the reception state confirmation processing of the full segment broadcast after step S116.

  On the other hand, if it is determined that there is no history that the reception status of the full-segment broadcasting is good at the current position or that the history is small (step S402; No), the processing returns to step S112.

  If the history information itself corresponding to the current position information acquired in step S114 is not included in the full segment broadcast reception status confirmation history information 121, the process proceeds to the full segment broadcast reception status confirmation processing in step S116 and subsequent steps.

  Also, if there is a record that the reception status of the full segment broadcast was bad around the current location using the history of the result of confirming the reception status of the full segment broadcast in the past, the reception status confirmation processing of the full segment broadcast may not be performed again. .

  As a result, using the history information that the full-segment broadcasting was not successfully received in the past, the reception status of the full-segment broadcasting is not confirmed in a place where there is a high possibility that the full-segment broadcasting cannot be received satisfactorily. Situation confirmation processing is performed intermittently, and it is possible to automatically switch from one-segment broadcast reception to full-segment broadcast reception while keeping the power consumption of the mobile phone terminal 1 low.

  Even in places where there has been a history that full-segment broadcasting has not been successfully received in the past, radio wave conditions may change due to changes in transmission equipment, etc., so check the reception status once every few times. Also good. This improves the convenience for the user.

(Embodiment 5)
Next, Embodiment 5 of the present invention will be described with reference to the flowchart of FIG.

The functional configuration of the mobile phone terminal 1 according to the fifth embodiment is substantially the same as that shown in FIG.
Further, the processing from step S112 to step S116, the processing up to step S112 (not shown), and the processing after step S116 are the same as the processing of the same number in FIG.

  The difference from the first embodiment is that when the timer expires in step S113, the control unit 11 first performs indoor / outdoor detection processing (step S501). For example, it is possible to detect whether or not the current location is in a building by comparing the current location information acquired by the location information acquisition unit 23 with the map information separately stored in the storage unit 12. In addition, when performing positioning using a GPS satellite, the accuracy of the measurement result can be known from the number of GPS sanitations that can be communicated, etc., so if the accuracy of the measurement result is lower than a predetermined level, , It can be detected that the user is indoors where the GPS satellite cannot be overlooked well, and if it is not, the user can be detected outdoor.

  When it is determined that the user is outdoors (step S502; Yes), the process proceeds to a reception status confirmation process for full-segment broadcasting after step S116.

  On the other hand, if it is determined that the user is indoors (step S502; No), the process returns to step S112.

  In addition, instead of the movement determination process of step S114 and step S115 of the first embodiment, a determination process is performed to determine whether the current position is indoor or outdoor. The reception status confirmation process may not be performed.

  As a result, when it is determined that the user is indoors, the full-seg broadcast reception status confirmation process is intermittently performed because the full-seg broadcast reception state confirmation is not performed because there is a high possibility that the full-seg broadcast cannot be satisfactorily received. Thus, it is possible to automatically switch from receiving one-segment broadcasting to receiving full-segment broadcasting while keeping the power consumption of the mobile phone terminal 1 low.

  In addition, even if it is indoors, since it is possible to charge the mobile phone terminal 1 immediately at home, there is a need to try to receive full-segment broadcasting without worrying about power consumption. In that case, even if it is determined that the location is indoor based on the accuracy of positioning using a GPS satellite, the current location is determined to be a previously registered location such as home. Exceptionally, it is also possible to check the reception status of full-segment broadcasting. Thereby, the user's usability improves.

(Embodiment 6)
Next, Embodiment 6 of the present invention will be described with reference to the flowcharts of FIGS. 11 and 12.

  FIG. 11 shows a functional configuration of the mobile phone terminal 1 according to the sixth embodiment. The difference from the first embodiment is that a short-range communication unit 26 is provided.

  The short-range communication unit 26 transmits / receives call voice, various data, and the like via a wireless communication base station by a communication method including, for example, a wireless LAN, PHS, and femtocell.

FIG. 12 is a flowchart showing digital broadcast reception processing of the mobile phone terminal 1 according to the sixth embodiment of the present invention.
The process up to step S112 (not shown) and the process after step S116 are the same as the processes with the same numbers in FIG.

  The difference from the first embodiment is that immediately after displaying the one-segment broadcasting, the control unit 11 detects whether or not the standby wireless communication base station has been changed (step S601).

  When the standby wireless communication base station is not changed (step S601; No), the control unit 11 continues to display the one-segment broadcasting (step S112).

  On the other hand, when the standby radio communication base station is changed (step S601; Yes), the process proceeds to the reception status confirmation process of full segment broadcasting after step S116.

  Whether the standby wireless communication base station has been changed is detected by the control unit 11 controlling the short-range communication unit 26. If the short-range communication unit 26 finds a radio communication base station that can communicate better, for example, when the mobile phone terminal 1 moves, the short-range communication unit 26 performs standby processing on the radio communication base station. The standby processing here refers to detecting pilot signals and beacon signals transmitted by the wireless communication base station, synchronizing them, understanding control messages transmitted by the wireless communication base station, location registration processing and authentication This is a state in which processing has been completed. In the series of standby processing, it can be seen that the information specifying the wireless communication base station has changed, and accordingly, it is recognized that the standby wireless communication base station has been changed.

  Also, in short-range communication such as wireless LAN or mobile phone communication, a determination process is performed to determine whether or not the standby wireless communication base station has changed. Broadcast reception status confirmation processing can also be performed.

  As a result, while the standby radio communication base station for near field communication does not change, it is assumed that the mobile phone terminal 1 has not moved so much and the reception status of the full segment broadcast from the previous time is essentially unchanged. Since the reception status confirmation of the broadcast is not performed, the reception status confirmation processing of the full segment broadcast is intermittently performed, and the power consumption of the mobile phone terminal 1 is kept low, and automatically from the one segment broadcast reception to the full segment broadcast reception. Can be switched.

  Although the change in the standby radio communication base station is detected via the short-range communication unit 26, the change in the standby radio communication base station may be detected via the communication unit 22. Further, it may be determined that there has been a movement by detecting a change in the reception state of a signal received from the standby radio communication base station instead of a change in the standby radio communication base station. In either case, it is possible to automatically switch from receiving one-segment broadcasting to receiving full-segment broadcasting while keeping the power consumption of the mobile phone terminal 1 low.

(Embodiment 7)
Next, Embodiment 7 of the present invention will be described with reference to the flowchart of FIG.

  The embodiments so far have been related to the operation of switching from one-segment broadcast reception to full-segment broadcast reception. On the other hand, regarding the operation of switching from full segment broadcast reception to one segment broadcast reception, a procedure other than the procedure of returning from step S105 (step S120) to step S103 in FIG. 5 can be considered. In the seventh embodiment, movement detection processing is periodically performed at the time of receiving a full-segment broadcast, and when a movement of a predetermined amount or more is detected, switching to one-segment broadcast reception is performed.

The functional configuration of the mobile phone terminal 1 according to the seventh embodiment is the same as that shown in FIG.
Further, the processing in step S105 and step S106, the processing up to step S105 (not shown), and the processing after step S106 are the same as the processing of the same number in FIG.

  The difference from the first embodiment is that the control unit 11 controls the timer unit 24 to start timer measurement while displaying full-segment broadcasting in step S105 (step S701).

  Then, the control unit 11 determines whether or not the timer has expired after a certain time has passed (step S702).

  The control unit 11 repeats the determination process until the timer expires (step S702; No).

  On the other hand, when it is detected that the timer has expired after a certain period of time (step S702; Yes), the control unit 11 controls the position information acquisition unit 23 to acquire the current position information of the mobile phone terminal 1 (step S702). S703).

  When the current position information is acquired, the control unit 11 determines whether or not there has been a movement of a predetermined distance or more by comparing the difference from the previous position information and a predetermined threshold value (step S704).

  Note that the processing from step S701 to step S704 is the same as the processing from step S112 to step S115 in FIG.

  If there is no movement beyond the predetermined value (step S704; No), the process returns to the timer measurement start process in step S701 while continuing the full segment broadcast display performed in step S105.

  On the other hand, if there has been a predetermined movement or more (step S704; Yes), the process proceeds to the one-segment broadcasting reception process after step S106.

  In general, it is difficult to receive full-segment broadcasting better during high-speed movement than when stationary. On the other hand, one-segment broadcasting can be received better even when moving compared to full-segment broadcasting. Therefore, as in this embodiment, when it is detected that there has been a predetermined amount of movement during reception of the full-segment broadcast, it is predicted that the full-segment broadcast cannot be received immediately, and automatic switching to the one-segment broadcast reception is performed. Thus, digital broadcasting can be continuously received, and user convenience is improved.

  The position information acquisition process in step S703 is for determining whether or not there has been a predetermined movement or more in step S704. If it can be determined whether or not there has been a predetermined movement or more in step S704, another processing method can be used. The points that may be present are the same as in step S114 of the first embodiment.

  Further, instead of the position information acquisition process in step S703, as described in the fifth embodiment, the indoor / outdoor detection process can be performed, and when it is determined that the room is indoor, the reception can be switched to the one-segment broadcasting reception. This improves the convenience for the user.

  As described above, during strong layer reception, the tuner and demodulation processing unit for the weak layer are intermittently operated to efficiently monitor the reception state of the weak layer. Switching to weak hierarchy reception can be performed. It is also possible to switch from weak layer reception to strong layer reception while reducing power consumption.

  The digital broadcast receiving process executed by the mobile phone terminal 1 according to the above embodiment can also be realized by a computer.

  For example, a program stored in the storage unit 12 or the like of the mobile phone terminal 1 in the above embodiment is a flexible disk, a CD-ROM (Compact Disk Read-Only Memory), a DVD (Digital Versatile Disk), an MO (Magneto-Optical). A device that executes the above-described processing can be configured by storing and distributing it in a computer-readable recording medium such as disk) and installing the program in the computer.

  Further, the program may be stored in a disk device or the like included in a predetermined server device on a communication network such as the Internet, and may be downloaded onto a computer by being superimposed on a carrier wave, for example.

The above-described processing can also be achieved by starting and executing a program while transferring it via a communication network.
Furthermore, the above-described processing can also be achieved by executing all or part of the program on the server device and executing the program while the computer transmits and receives information regarding the processing via the communication network.

  Note that when the above functions are realized by sharing an OS (Operating System) or when the functions are realized by cooperation between the OS and an application, only the part other than the OS may be stored in a medium and distributed. It may also be downloaded to a computer.

2 is a diagram illustrating a functional configuration of a mobile phone terminal according to Embodiment 1. FIG. It is a figure which shows the structure of a one segment tuner part. It is a figure which shows the graph which plotted the time change of the BER value. It is a flowchart explaining a full segment video output process. 4 is a flowchart for explaining digital broadcast reception processing according to the first embodiment. 7 is a part of a flowchart for explaining digital broadcast reception processing according to the second embodiment. 10 is a part of a flowchart for explaining digital broadcast reception processing according to the third embodiment. It is a figure which shows an example of the data structure of full segment broadcast reception state confirmation log | history information. 10 is a part of a flowchart for explaining digital broadcast reception processing according to a fourth embodiment. 10 is a part of a flowchart for explaining digital broadcast reception processing according to a fifth embodiment. FIG. 10 is a diagram illustrating a functional configuration of a mobile phone terminal according to a sixth embodiment. 14 is a part of a flowchart for explaining digital broadcast reception processing according to a sixth embodiment. 14 is a part of a flowchart for explaining digital broadcast reception processing according to the seventh embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cell-phone terminal, 11 ... Control part, 12 ... Memory | storage part, 13 ... Operation part, 14 ... Display part, 15 ... One segment tuner part, 16 ... One segment decoding part, 17 ... Full segment tuner part, 18 ... Descramble part, DESCRIPTION OF SYMBOLS 19 ... Full segment decoding part, 20 ... Audio | voice output part, 21 ... Audio | voice input part, 22 ... Communication part, 23 ... Position information acquisition part, 24 ... Timer part, 25 ... Bus, 26 ... Short-distance communication part

Claims (16)

A digital broadcast receiving apparatus that receives a digital broadcast signal in which a program having the same content by hierarchical transmission is broadcast on a weak hierarchy that is weak in noise resistance and a strong hierarchy that is strong in noise resistance,
A signal quality measurement unit for measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding unit that extracts the weak layer signal constituting the weak layer from the digital broadcast signal and decodes the weak layer signal;
A strong layer signal decoding unit that extracts the strong layer signal constituting the strong layer from the digital broadcast signal and decodes the strong layer signal;
A signal reproducing unit that reproduces either the decoded weak layer signal or the strong layer signal;
A position measurement unit that measures the movement amount and movement speed of a user who uses the device,
When the movement amount and / or the movement speed is less than a predetermined threshold, the signal reproduction unit continues reproduction of the strong layer signal,
Before SL when the movement amount and / or the moving speed is equal to or greater than a predetermined threshold value, the signal quality measurement unit, the signal quality is determined whether satisfies a predetermined quality,
When the signal quality satisfies a predetermined quality, the signal reproduction unit stops reproduction of the strong layer signal and reproduces the weak layer signal, and when the signal quality does not satisfy the predetermined quality, the weak layer Stop the operation of the signal decoding unit,
A digital broadcast receiver characterized by that. The signal quality measurement unit determines whether the signal quality satisfies a predetermined quality when the strong layer signal is being reproduced;
The digital broadcast receiver according to claim 1. A timer unit for measuring the timer time, and
The position measuring unit starts measuring the moving amount and the moving speed when the timer time counted by the timer unit reaches a predetermined time.
The digital broadcast receiving apparatus according to claim 1 or 2. The predetermined time is set to be smaller as the movement amount and / or the movement speed is larger.
The digital broadcast receiver according to claim 3. A digital broadcast receiving apparatus that receives a digital broadcast signal in which a program having the same content by hierarchical transmission is broadcast on a weak hierarchy that is weak in noise resistance and a strong hierarchy that is strong in noise resistance,
A weak layer signal decoding unit that extracts the weak layer signal constituting the weak layer from the digital broadcast signal and decodes the weak layer signal;
A strong layer signal decoding unit that extracts the strong layer signal constituting the strong layer from the digital broadcast signal and decodes the strong layer signal;
A signal quality measuring unit for measuring the signal quality indicated by the decoded weak layer signal and strong layer signal;
A signal reproducing unit for reproducing either the weak hierarchical signal or the strong hierarchical signal;
A position measurement unit that measures the movement amount and movement speed of a user who uses the device,
The signal quality measurement unit determines whether or not the signal quality indicated by the strong layer signal satisfies a predetermined strong layer quality when the strong layer signal is being reproduced,
The position measurement unit determines whether the movement amount and / or the movement speed is equal to or higher than a predetermined threshold when it is determined that the signal quality indicated by the strong hierarchy signal satisfies the predetermined strong hierarchy quality. Judgment,
When the movement amount and / or the movement speed is less than a predetermined threshold, the signal reproduction unit continues reproduction of the strong layer signal,
If the previous SL amount of movement and / or the moving speed is equal to or more than the predetermined threshold value, the signal quality measurement unit, the signal quality indicated by the weak layer signal it is determined whether or not satisfy a predetermined weak hierarchical quality ,
When the signal quality indicated by the weak hierarchy signal satisfies the predetermined weak hierarchy quality, the signal reproduction unit stops reproducing the strong hierarchy signal and reproduces the weak hierarchy signal, and indicates the weak hierarchy signal. If the signal quality to be satisfied does not satisfy the predetermined weak layer quality, the operation of the weak layer signal decoding unit is stopped,
A digital broadcast receiver characterized by that. A digital broadcast receiving apparatus that receives a digital broadcast signal in which a program having the same content by hierarchical transmission is broadcast on a weak hierarchy that is weak in noise resistance and a strong hierarchy that is strong in noise resistance,
A signal quality measurement unit for measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding unit that extracts the weak layer signal constituting the weak layer from the digital broadcast signal and decodes the weak layer signal;
A strong layer signal decoding unit that extracts the strong layer signal constituting the strong layer from the digital broadcast signal and decodes the strong layer signal;
A signal reproducing unit that reproduces either the decoded weak layer signal or the strong layer signal;
A position measurement unit that measures position information indicating the position of the device itself;
A storage unit that associates and stores the position information and the number and / or rate of signal quality indicated by the weak hierarchical signal at the position that satisfies a predetermined quality;
The signal quality measurement section, when the strong layer signal is being reproduced, the number and / or the percentage associated with the position of the own apparatus determines whether more than a predetermined threshold value, the own device If the number of times and / or the ratio associated with the position is equal to or higher than a predetermined threshold, it is determined whether or not the signal quality indicated by the weak hierarchical signal satisfies a predetermined quality,
When the signal quality indicated by the weak layer signal satisfies the predetermined quality, the signal reproduction unit stops reproduction of the strong layer signal and reproduces the weak layer signal, and the signal indicated by the weak layer signal When the quality does not satisfy the predetermined quality, the operation of the weak layer signal decoding unit is stopped.
A digital broadcast receiver characterized by that. A digital broadcast receiving apparatus that receives a digital broadcast signal in which a program having the same content by hierarchical transmission is broadcast on a weak hierarchy that is weak in noise resistance and a strong hierarchy that is strong in noise resistance,
A signal quality measurement unit for measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding unit that extracts the weak layer signal constituting the weak layer from the digital broadcast signal and decodes the weak layer signal;
A strong layer signal decoding unit that extracts the strong layer signal constituting the strong layer from the digital broadcast signal and decodes the strong layer signal;
A signal reproducing unit that reproduces either the decoded weak layer signal or the strong layer signal;
An outdoor determination unit that determines whether or not the position of the own device is outdoors,
When it is determined that the position of the device is not outdoors when the strong layer signal is being reproduced, the signal reproduction unit continues the reproduction of the strong layer signal,
When prior SL strong layer signal is being reproduced, when the position of the own device is determined to be outdoors, the signal quality measurement unit, the signal quality indicated by the weak layer signal satisfies a predetermined quality Whether or not
When the signal quality indicated by the weak layer signal satisfies the predetermined quality, the signal reproduction unit stops reproduction of the strong layer signal and reproduces the weak layer signal, and the signal indicated by the weak layer signal When the quality does not satisfy the predetermined quality, the operation of the weak layer signal decoding unit is stopped.
A digital broadcast receiver characterized by that. The position measuring unit for measuring position information indicating the position of the device;
A map storage unit for storing a map showing the position of the device and indoor and outdoor positions;
An outdoor determination unit that compares the position of the own device with the indoor and outdoor positions and determines whether the position of the own device is outdoors; or
The digital broadcast receiver according to claim 6. A digital broadcast receiving apparatus that receives a digital broadcast signal in which a program having the same content by hierarchical transmission is broadcast on a weak hierarchy that is weak in noise resistance and a strong hierarchy that is strong in noise resistance,
A signal quality measurement unit for measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding unit that extracts the weak layer signal constituting the weak layer from the digital broadcast signal and decodes the weak layer signal;
A strong layer signal decoding unit that extracts the strong layer signal constituting the strong layer from the digital broadcast signal and decodes the strong layer signal;
A signal reproducing unit that reproduces either the decoded weak layer signal or the strong layer signal;
A wireless communication unit that performs wireless communication with a plurality of base stations;
A communication quality measuring unit that measures the communication quality indicated by the wireless communication,
If the base station with which the wireless communication unit performs wireless communication is not changed when the strong layer signal is being reproduced, or if the communication quality satisfies a predetermined quality, the signal reproduction unit Continue playing,
When prior SL strong layer signal is being reproduced, the radio communication unit has changed the base station for performing radio communication, or, if the communication quality does not satisfy a predetermined communication quality, the signal quality measurement section , the signal quality indicated by the weak layer signal it is determined whether or not satisfy a predetermined quality,
When the signal quality indicated by the weak layer signal satisfies the predetermined quality, the signal reproduction unit stops reproduction of the strong layer signal and reproduces the weak layer signal, and the signal indicated by the weak layer signal When the quality does not satisfy the predetermined quality, the operation of the weak layer signal decoding unit is stopped.
A digital broadcast receiver characterized by that. A digital broadcast receiving apparatus that receives a digital broadcast signal in which a program having the same content by hierarchical transmission is broadcast on a weak hierarchy that is weak in noise resistance and a strong hierarchy that is strong in noise resistance,
A signal quality measurement unit for measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding unit that extracts the weak layer signal constituting the weak layer from the digital broadcast signal and decodes the weak layer signal;
A strong layer signal decoding unit that extracts the strong layer signal constituting the strong layer from the digital broadcast signal and decodes the strong layer signal;
A signal reproducing unit that reproduces either the decoded weak layer signal or the strong layer signal;
And a outdoor-format tough to determine constant whether the outdoor position of the own apparatus,
When it is determined that the position of the own device is indoors , the signal reproduction unit stops reproducing the weak layer signal and reproduces the strong layer signal, and determines that the position of the own device is outdoors. If it is, causes continued operation of the weak layer signal decoding unit,
A digital broadcast receiver characterized by that. A program having the same content by hierarchical transmission is a program executed by a computer that receives a digital broadcast signal that is broadcast in a weak hierarchy weak in noise resistance and a strong hierarchy strong in noise resistance,
In the computer,
A signal quality measurement step of measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding step of taking out the weak layer signal constituting the weak layer from the digital broadcast signal and decoding the weak layer signal;
A strong layer signal decoding step of extracting the strong layer signal constituting the strong layer from the digital broadcast signal and decoding the strong layer signal;
A signal reproducing step of reproducing either the weak layer signal or the strong layer signal decoded;
And a position measuring step for measuring a moving amount and a moving speed of a user who uses the device,
When the movement amount and / or the movement speed is less than a predetermined threshold, in the signal reproduction step, the reproduction of the strong layer signal is continued.
Before SL when the movement amount and / or the moving speed is equal to or larger than a predetermined threshold, in the signal quality measurement step, the signal quality is determined whether satisfies a predetermined quality,
In the signal reproduction step, when the signal quality satisfies a predetermined quality, the reproduction of the strong layer signal is stopped to reproduce the weak layer signal, and when the signal quality does not satisfy the predetermined quality, the weak layer Stop the signal decoding process,
A program characterized by that. A program having the same content by hierarchical transmission is a program executed by a computer that receives a digital broadcast signal that is broadcast in a weak hierarchy weak in noise resistance and a strong hierarchy strong in noise resistance,
In the computer,
A weak layer signal decoding step of taking out the weak layer signal constituting the weak layer from the digital broadcast signal and decoding the weak layer signal;
A strong layer signal decoding step of extracting the strong layer signal constituting the strong layer from the digital broadcast signal and decoding the strong layer signal;
A signal quality measuring step of measuring the signal quality indicated by the decoded weak layer signal and the strong layer signal;
A signal reproduction step of reproducing either the weak layer signal or the strong layer signal;
And a position measuring step for measuring a moving amount and a moving speed of a user who uses the device,
In the signal quality measurement step, when the strong layer signal is being reproduced, it is determined whether or not the signal quality indicated by the strong layer signal satisfies a predetermined strong layer quality,
In the position measurement step, if it is determined that the signal quality indicated by the strong layer signal satisfies the predetermined strong layer quality, whether or not the movement amount and / or the moving speed is equal to or higher than a predetermined threshold value. Judgment,
When the movement amount and / or the movement speed is less than a predetermined threshold, the signal reproduction step continues the reproduction of the strong layer signal,
If the previous SL amount of movement and / or the moving speed is equal to or more than the predetermined threshold value, in the signal quality measurement step, the signal quality indicated by the weak layer signal it is determined whether or not satisfy a predetermined weak hierarchical quality ,
In the signal reproduction step, when the signal quality indicated by the weak hierarchy signal satisfies the predetermined weak hierarchy quality, the reproduction of the strong hierarchy signal is stopped and the weak hierarchy signal is reproduced, and is indicated by the weak hierarchy signal. Stopping the weak layer signal decoding process if the signal quality to be satisfied does not satisfy the predetermined weak layer quality,
A program characterized by that. A program having the same content by hierarchical transmission is a program executed by a computer that receives a digital broadcast signal that is broadcast in a weak hierarchy weak in noise resistance and a strong hierarchy strong in noise resistance,
In the computer,
A signal quality measurement step of measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding step of taking out the weak layer signal constituting the weak layer from the digital broadcast signal and decoding the weak layer signal;
A strong layer signal decoding step of extracting the strong layer signal constituting the strong layer from the digital broadcast signal and decoding the strong layer signal;
A signal reproducing step of reproducing either the weak layer signal or the strong layer signal decoded;
A position measurement process for measuring position information indicating the position of the device itself;
A storage step of associating and storing the position information and the number and / or ratio of the signal quality indicated by the weak hierarchical signal at the position satisfying a predetermined quality;
In the signal quality measurement step, when the strong layer signal is being reproduced, the number and / or the percentage associated with the position of the own apparatus determines whether more than a predetermined threshold value, the own device If the number of times and / or the ratio associated with the position is equal to or higher than a predetermined threshold, it is determined whether or not the signal quality indicated by the weak hierarchical signal satisfies a predetermined quality,
In the signal reproduction step, when the signal quality indicated by the weak hierarchy signal satisfies the predetermined quality, the reproduction of the strong hierarchy signal is stopped to reproduce the weak hierarchy signal, and the signal indicated by the weak hierarchy signal If the quality does not satisfy the predetermined quality, stop the weak layer signal decoding step;
A program characterized by that. A program having the same content by hierarchical transmission is a program executed by a computer that receives a digital broadcast signal that is broadcast in a weak hierarchy weak in noise resistance and a strong hierarchy strong in noise resistance,
In the computer,
A signal quality measurement step of measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding step of taking out the weak layer signal constituting the weak layer from the digital broadcast signal and decoding the weak layer signal;
A strong layer signal decoding step of extracting the strong layer signal constituting the strong layer from the digital broadcast signal and decoding the strong layer signal;
A signal reproducing step of reproducing either the weak layer signal or the strong layer signal decoded;
An outdoor determination step of determining whether or not the position of the own device is outdoors,
When it is determined that the position of the own device is not outdoors when the strong layer signal is being reproduced, the signal reproduction step continues the reproduction of the strong layer signal,
When prior SL strong layer signal is being reproduced, when the position of the own device is determined to be outdoors, and in the signal quality measurement step, the signal quality indicated by the weak layer signal satisfies a predetermined quality Whether or not
In the signal reproduction step, when the signal quality indicated by the weak hierarchy signal satisfies the predetermined quality, the reproduction of the strong hierarchy signal is stopped to reproduce the weak hierarchy signal, and the signal indicated by the weak hierarchy signal If the quality does not satisfy the predetermined quality, stop the weak layer signal decoding step;
A program characterized by that. A program having the same content by hierarchical transmission is a program executed by a computer that receives a digital broadcast signal that is broadcast in a weak hierarchy weak in noise resistance and a strong hierarchy strong in noise resistance,
In the computer,
A signal quality measurement step of measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding step of taking out the weak layer signal constituting the weak layer from the digital broadcast signal and decoding the weak layer signal;
A strong layer signal decoding step of extracting the strong layer signal constituting the strong layer from the digital broadcast signal and decoding the strong layer signal;
A signal reproducing step of reproducing either the weak layer signal or the strong layer signal decoded;
A wireless communication step of performing wireless communication with a plurality of base stations;
A communication quality measurement step of measuring the communication quality indicated by the wireless communication, and
When the base station that performs the wireless communication is not changed when the strong layer signal is being reproduced, or when the communication quality satisfies a predetermined quality, in the signal reproduction step, the strong layer signal is reproduced. Continue,
When prior SL strong layer signal is being reproduced, previous base station that performs quinic line communication is changed, or, when the communication quality does not satisfy a predetermined communication quality, in the signal quality measurement process, the Determine whether the signal quality indicated by the weak hierarchical signal satisfies a predetermined quality,
In the signal reproduction step, when the signal quality indicated by the weak hierarchy signal satisfies the predetermined quality, the reproduction of the strong hierarchy signal is stopped to reproduce the weak hierarchy signal, and the signal indicated by the weak hierarchy signal If the quality does not satisfy the predetermined quality, stop the weak layer signal decoding step;
A program characterized by that. A program having the same content by hierarchical transmission is a program executed by a computer that receives a digital broadcast signal that is broadcast in a weak hierarchy weak in noise resistance and a strong hierarchy strong in noise resistance,
In the computer,
A signal quality measurement step of measuring the signal quality of the weak layer indicated by the received digital broadcast signal;
A weak layer signal decoding step of taking out the weak layer signal constituting the weak layer from the digital broadcast signal and decoding the weak layer signal;
A strong layer signal decoding step of extracting the strong layer signal constituting the strong layer from the digital broadcast signal and decoding the strong layer signal;
A signal reproducing step of reproducing either the weak layer signal or the strong layer signal decoded;
And outdoor determination Priority determination step of location of the device itself determine constant whether outdoors, is executed,
In the signal reproduction step, when it is determined that the position of the own device is indoors, the reproduction of the weak layer signal is stopped and the strong layer signal is reproduced, and the position of the own device is determined to be outdoors. If it is, causes continued the weak layer signal decoding step,
A program characterized by that.

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