Receiver, receiving method and program

Abstract

To urge a user to take a more appropriate action when deterioration of a reception quality is detected.SOLUTION: A receiver comprises: a broadcasting reception part that measures a reception quality value indicating reception quality of a broadcasted data signal and a bit rate of the data signal; and a control part that outputs notification information indicating a possibility of reduction of the reception quality caused by ground wave advancement broadcasting of a segment division system to a notification part in response to an event that, when the reception quality value is good, the bit rate at a specific time point is reduced to be lower than a bit rate before the specific time point.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a receiver, a receiving method, and a program. [Background technology]

[0002] When receiving digital television broadcasts, reception interference can occur. Providing hints about the causes of reception interference and solutions to help viewers enjoy broadcast programs has been proposed. For example, the receiving device described in Patent Document 1 includes a television device main body and a remote controller. The television device main body includes an antenna, an analog modulation wave demodulation unit, a signal control unit, a system control unit, a digital modulation wave demodulation unit, a digital decoding processing unit, a graphic drawing multiplex display processing unit, an audio output processing unit, a speaker, an internal or external display device, a known defect display processing unit, and a user information storage unit. The known defect status storage unit stores known information about reception interference. The known information is stored, for example, as a table that associates channels with the details of the defects.

[0003] On the other hand, for advanced terrestrial broadcasting (sometimes simply called "advanced broadcasting"), the use of a segment division method to transmit data signals is being considered. Here, we will explain segments. In terrestrial digital broadcasting, the frequency band per station is divided into 13 segments. One of the 13 segments is used to transmit the data signal for One-Seg broadcasting, and the remaining 12 segments are used to transmit the data signal for High-Vision broadcasting (also called 2K signal). Note that the 12 segments may be further divided to transmit three standard definition data signals, or to transmit both standard definition and high-definition data signals for multi-channel broadcasting.

[0004] In advanced terrestrial broadcasting using the segment division method (also called advanced terrestrial broadcasting (segment division method)), 8 of the 13 segments transmit a data signal (2K signal) that provides the same video as current terrestrial digital broadcasting, 1 of the 13 segments transmits a data signal that provides the same video as one-segment broadcasting, and 4 of the 13 segments transmit a new data signal (also called a 4K signal) that provides video with higher resolution, also known as 4K or 8K. In advanced terrestrial broadcasting (segment division method), it is being considered to transmit data signals using this three-layer segment division. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-72335 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when a broadcast channel that transmits data signals using advanced terrestrial broadcasting with segment division is selected, the reception quality of the 2K signal is expected to be lower than that of a data signal transmitted without the segment division method due to the reduced number of segments used. It is difficult for users to determine that this deterioration in reception quality is due to the segment division method. Since the cause of the deterioration in reception quality cannot be identified, users may take unnecessary measures. For example, users may suspect that the cause of the deterioration in reception quality is reception interference, a defect or malfunction in the broadcasting service or receiver, and may make unnecessary inquiries to the broadcasting company, the manufacturer or seller of the receiver. [Means for solving the problem]

[0007] The present invention has been made to solve the above-mentioned problems, and one aspect of the present invention is a broadcast receiving unit that receives a TMCC signal including information on the number of segments;The number of segments indicated by the information included in the TMCC signal is After a certain point in time, the number of segments is greater than the number of segments before the certain point in time. decrease and a control unit that outputs notification information to the notification unit based on the result of the detection of a problem, which indicates the possibility of a deterioration in the reception quality of the broadcast data signal due to advanced terrestrial broadcasting using the segment division method.

[0008] Another aspect of the present invention is a receiver comprising: a broadcast receiving unit that measures a reception quality value, which is the reception quality of a broadcast data signal, and the bit rate of the data signal; and a control unit that, when the reception quality value is good, outputs notification information to the notification unit indicating the possibility of a decrease in the reception quality of the data signal due to advanced terrestrial broadcasting using a segment division method, based on the fact that the bit rate has decreased after a specific point in time compared to the bit rate before the specific point in time.

[0009] Another aspect of the present invention is a broadcast receiving step of receiving a TMCC signal including information on the number of segments; The number of segments indicated by the information included in the TMCC signal is After a certain point in time, the number of segments is greater than the number of segments before the certain point in time. decrease and a control step of outputting notification information to a notification unit based on the result of the detection of a possibility of a deterioration in the reception quality of a broadcast data signal due to advanced terrestrial broadcasting using a segment division method.

[0010] Another aspect of the present invention is a program for causing a computer to execute a broadcast reception step of measuring a reception quality value, which is the reception quality of a broadcast data signal, and the bit rate of the data signal, and a control step of outputting notification information to a notification unit, when the reception quality value is good, indicating the possibility of a decrease in reception quality due to advanced terrestrial broadcasting using a segment division method, based on the fact that the bit rate has decreased after a specific point in time compared to the bit rate before the specific point in time.

[0011] Another aspect of the present invention is a broadcast reception method comprising: a broadcast reception step in which a receiver receives a TMCC signal including information on the number of segments; The number of segments indicated by the information included in the TMCC signal isAfter a certain point in time, the number of segments is greater than the number of segments before the certain point in time. decrease and a control step of outputting notification information indicating the possibility of a degradation in the reception quality of the data signal due to advanced terrestrial broadcasting using the segment division method to the notification unit based on the result of the detection.

[0012] Another aspect of the present invention is a receiving method having a broadcast receiving step in which a receiver measures a reception quality value, which is the reception quality of a broadcast data signal, and the bit rate of the data signal, and a control step in which, when the reception quality value is good, outputting notification information to a notification unit, which indicates the possibility of a decrease in reception quality due to advanced terrestrial broadcasting using a segment division method, based on the fact that the bit rate has decreased after a specific point in time compared to the bit rate before the specific point in time. [Effects of the Invention]

[0013] According to the embodiment of the present invention, when a deterioration in reception quality is detected, it is possible to prompt the user to take a more appropriate action. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic block diagram illustrating an example of the configuration of a receiving system according to a first embodiment. [Figure 2] 5 is a flowchart showing an example of a channel search process according to the first embodiment. [Figure 3] 10 is a flowchart showing an example of an output determination process according to the first embodiment. [Figure 4] FIG. 3 is a diagram showing an example of a display image displayed by a display unit according to the first embodiment. [Figure 5] FIG. 4 is a diagram showing another example of a display image displayed by the display unit according to the first embodiment. [Figure 6] 10 is a flowchart showing an example of an output determination process according to the second embodiment. [Figure 7] 11 is a flowchart showing an example of an output determination process according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. When the configuration described in a particular embodiment, modification, or section is similar to the configuration described in another embodiment, modification, or section, that description may be used without repeating it. Furthermore, components having the same functions as those described in each section are designated by the same reference numerals, and their descriptions will be used unless otherwise specified.

[0016] First Embodiment An example of the configuration of a receiving system 1 according to the first embodiment will be described. FIG. 1 is a schematic block diagram showing an example of the configuration of a receiving system 1 according to this embodiment. The receiving system 1 includes an antenna unit 80 and a receiver 100. The following description mainly focuses on the case where the receiver 100 provides broadcasting services for current broadcasting, but does not provide broadcasting services for advanced broadcasting.

[0017] The antenna unit 80 receives broadcast waves sent from a broadcast station and includes an antenna 82 and a booster 84. The antenna 82 receives the electric signal generated by receiving the incoming broadcast wave as a broadcast signal. The antenna 82 is, for example, a parabolic antenna. The antenna 82 outputs the received broadcast signal to the booster 84. Booster 84 amplifies the intensity of the broadcast signal input from antenna 82 and outputs the amplified broadcast signal to receiver 100 .

[0018] The receiver 100 extracts a data signal from a broadcast signal input from the antenna unit 80, and presents the audio and video of the broadcast program as content transmitted by the extracted data signal. The receiver 100 measures a reception quality value, which is the reception quality of a broadcast data signal, and the bit rate of the data signal. If the reception quality value is good, the receiver 100 outputs notification information indicating the possibility of a decrease in reception quality due to segment-based advanced terrestrial broadcasting, based on the fact that the bit rate has decreased after a specific point in time compared to the bit rate before the specific point in time.

[0019] Here, reception quality refers to signal quality such as the signal strength and bit error rate of the broadcast signal (data signal), and reception grade refers to the quality of the video (image) displayed on the receiver 100, such as the bit rate and resolution. Further, advanced terrestrial broadcasting using the segment division method includes, for example, the SISO (single-input single-output) method and the MIMO (multiple-input multiple-output) method. These are also referred to as the advanced terrestrial segment division SISO method, the advanced terrestrial segment division MIMO method, or the advanced terrestrial segment division method. The segment division method in this embodiment may be any of these methods.

[0020] The receiver 100 comprises a main system unit 10, a transmission / reception module 40, an operation input unit 50, a speaker 60, and a display unit 70. The speaker 60 and the display unit 70 function as a notification unit 55 that notifies various types of information. The notified information includes, for example, notification information for announcing the start of broadcasting using the terrestrial advanced segment division method.

[0021] The main system unit 10 separates a data signal from a broadcast signal input from the antenna unit 80. The main system unit 10 separates a control signal and a content signal from the separated data signal. The control signal is a signal that carries various control information used in receiving and processing the broadcast signal. The content signal is a signal that carries the content. The main system unit 10 decodes an audio signal and a video signal that represent the audio that makes up the content. The main system unit 10 outputs the decoded audio signal to the speaker 60. The main system unit 10 also outputs the decoded video signal to the display unit 70.

[0022] The speaker 60 outputs (plays back) sound based on the audio signal input from the main system unit 10. The display unit 70 displays an image based on a video signal input from the main system unit 10 on a display surface. The display unit 70 includes, for example, a display element and a drive circuit for driving the display element. The display element may be any type of display, such as a liquid crystal display, a plasma display, or an organic electroluminescence display.

[0023] The transmitting / receiving module 40 is connected to a communication network wirelessly or via a wired connection, and transmits and receives various types of data to and from devices connected to the communication network. The transmitting / receiving module 40 is connected to an in-house communication network that complies with standards such as IEEE802.11 and IEEE802.15.3. The transmitting / receiving module 40 connects to a destination device via the network, and transmits and receives data to and from that device. Specifically, the transmitting / receiving module 40 transmits transmission data input from the main system unit 10 to the destination device. The main system unit 10 also receives reception data from the source device and outputs the received reception data to the main system unit 10.

[0024] The operation input unit 50 acquires an operation signal based on a user's operation and outputs the acquired operation signal to the main system unit 10. The main system unit 10 controls the operation of the receiver 100 based on the operation signal input from the operation input unit 50. The operation signal includes instruction signals for executing or stopping a predetermined function, selecting a broadcast channel, selecting or setting various information, adjusting the volume, adjusting the color tone, etc.

[0025] The operation input unit 50 may include a member for receiving an operation. Such a member may include, for example, a dedicated member such as a button, dial, or knob, or a general-purpose member such as a touch sensor or mouse. The touch sensor may be integrated with a display and function as a touch panel. For example, the operation input unit 50 may include a sensor that receives an operation signal wirelessly from a remote controller. The sensor may be, for example, an infrared sensor or any other member that can detect electromagnetic waves that carry an operation signal.

[0026] The main system unit 10 includes a control unit 12 , a broadcast receiving unit 13 , an audio processing unit 20 , a display processing unit 24 , a storage unit 26 , a flash memory 28 , and a digital I / F 30 . The control unit 12 controls the processing of each unit of the receiver 100 and performs the functions of the receiver 100. The control unit 12 may be configured with dedicated hardware, or may be configured with a general-purpose computer system. The computer system includes at least an arithmetic processing unit and a storage medium. For example, a processor such as a CPU (Central Processing Unit) can be used as the arithmetic processing unit. The storage medium includes a storage unit 26 and a flash memory 28. The arithmetic processing unit reads a program stored in advance in the flash memory 28, and loads the read program into the storage unit 26. The arithmetic processing unit executes the program loaded into the storage unit 26 to realize the functions of the control unit 12. In this application, "executing a program" or "running a program" includes the meaning of executing processing instructed by instructions written in the program.

[0027] An operation signal may be input to the control unit 12 from the operation input unit 50. When an operation signal is input, the control unit 12 executes processing using various information instructed by the operation signal. The control unit 12 outputs an audio signal or a video signal acquired by the processing executed by itself to the audio processing unit 20 or the display processing unit 24, respectively.

[0028] The functions of the control unit 12 may be realized by executing a program acquired by software download. In software download, the program is carried by broadcast waves as part of a data signal. The presence or absence of the program or the time at which the program is transmitted may be notified, for example, using notification information multiplexed into the content signal. When the content signal of a broadcast program is multiplexed using the MMT-TLV (MPEG Media Transport-Length Value) format, the notification information may be transmitted using, for example, an MH-SDTT (Software Download Trigger Table) as an information element. The control unit 12 can extract the program from the data signal obtained at the time notified by the notification information.

[0029] In this embodiment, a data signal (2K signal) of a current broadcast may be transmitted, or a data signal (2K signal, 4K signal) using advanced terrestrial broadcasting (segment division method) may be transmitted.

[0030] Therefore, the control unit 12 uses the following method to determine whether the degradation in reception quality is due to advanced terrestrial broadcasting using the segment division method. More specifically, the control unit 12 measures a reception quality value, which is the reception quality of the broadcast data signal, and the bit rate of the data signal. If the reception quality value is good, the control unit 12 outputs notification information indicating the possibility of degradation in reception quality due to advanced terrestrial broadcasting using the segment division method, based on the fact that the bit rate has decreased after a specific point in time compared to the bit rate before the specific point in time.

[0031] The timing at which the control unit 12 executes the notification information output determination process is, for example, when a new broadcast channel is selected. The broadcast channel designated by an operation signal input from the operation input unit 50 can be selected as the first broadcast channel. Selection of a new broadcast channel includes not only a case where a broadcast channel currently being received is changed to another broadcast channel, but also a case where, after power supply is resumed, a receiving channel indicated by receiving channel information previously stored in the memory unit 26 before power was cut off is identified. The second broadcast channel is a broadcast channel whose reception quality has been measured by a channel search, excluding the first broadcast channel. Details of the channel search and output determination process will be described later.

[0032] The broadcast receiving unit 13 demodulates the data signal transmitted by the broadcast signal input from the antenna unit 80. The broadcast receiving unit 13 extracts the audio signal and video signal of the broadcast program from the demodulated data signal. The broadcast receiving unit 13 outputs the extracted audio signal to the audio processing unit 20 and outputs the extracted video signal to the display processing unit 24. The broadcast receiving unit 13 includes a tuner unit 14, a demodulation unit 16, and a descrambling / demux unit 18.

[0033] The tuner unit 14 selects a broadcast channel designated by channel selection information input from the control unit 12 as the first broadcast channel of the broadcast signal input from the antenna unit 80. The channel selection information is designated by an operation signal input from the operation input unit 50. The tuner unit 14 down-converts the input broadcast signal based on a center frequency (broadcast frequency) corresponding to the selected broadcast channel, converting it into an intermediate frequency (IF) signal. The tuner unit 14 measures the strength of the input received signal as a received signal strength indicator (RSSI). The tuner unit 14 outputs the measured received signal strength to the control unit 12. Based on the measured received signal strength, the tuner unit 14 adjusts the amplitude of the IF signal so that the signal level falls within a predetermined range. The tuner unit 14 outputs the amplitude-adjusted IF signal to the demodulation unit 16.

[0034] The demodulation unit 16 demodulates the IF signal input from the tuner unit 14 using a predetermined demodulation method and converts it into a digital signal. The demodulation unit 16 performs error detection and error correction on the converted digital signal. The demodulation unit 16 uses, as the predetermined demodulation method, a method corresponding to the modulation method used to modulate the digital signal to be broadcast. For example, the demodulation method used is a method corresponding to a modulation method such as 64QAM or 16QAM. The demodulation unit 16 measures the reception quality of the input IF signal. The demodulation unit 16 measures, as indicators of reception quality, for example, the bit rate, the carrier to noise ratio (CN ratio), and the bit error rate (BER).

[0035] The demodulator 16 calculates, for example, a modulation error ratio (MER) from the demodulated signal using a known method. The modulation error ratio is an index that indicates the magnitude of fluctuation of the value of each symbol representing the IF signal from a predetermined reference value. The demodulator 16 can convert the MER to a CN ratio using a known conversion formula. The bit rate is an index that indicates higher transmission speeds as the bit rate value increases. The CN ratio is an index that indicates higher reception quality as the bit rate value increases. The BER is an index that indicates the ratio of the number of bits including errors to the total number of bits.

[0036] In error detection, the demodulator 16 compares a calculated value obtained by performing a certain calculation process on each block that constitutes a part of the digital signal with an error detection code to determine whether the two match. When transmitting a data signal, the calculated value obtained by the calculation process on each block is added as an error detection code. The demodulator 16 detects a bit error when the two do not match, and can determine the BER based on the frequency at which the bit error is detected. The smaller the BER value, the higher the reception quality. The demodulator 16 outputs reception quality information, which indicates an index of the measured reception quality, to the controller 12.

[0037] In this embodiment, the demodulator 16 uses the demodulated data signal to measure reception quality. The demodulator 16 can identify a data region of the IF signal to which data symbols constituting the data signal are assigned and a pilot region to which symbols constituting the pilot signal are assigned. The pilot signal is a reference signal whose main purpose is to measure reception quality and is not intended to transmit information. The demodulator 16 can generate a data signal and a pilot signal by concatenating bits represented by symbols assigned to the identified data region and pilot region, respectively. The symbol allocation may be indicated, for example, by a TMCC signal constituting a control signal. Furthermore, the TMCC signal constituting a control signal may include information on the number of segments used in the selected channel.

[0038] The data region includes a control region (e.g., a TMCC region) carrying symbols constituting a control signal, and other regions. Symbols constituting a content signal are allocated to the other regions. The demodulator 16 can generate a control signal and a content signal by concatenating bits represented by the symbols allocated to the identified control region and other regions, respectively. The demodulator 16 outputs the generated content signal to the descrambling / demuxing unit 18.

[0039] The descrambling / demuxing unit 18 descrambles the content signal input from the demodulation unit 16. Descrambling is equivalent to descrambling. Descrambling rearranges the bit sequence of the input content signal in the reverse order of the scrambling performed on the bit sequence of the broadcast content signal. The descrambling / demuxing unit 18 separates the descrambled data signal into component signals such as audio and video signals by referencing the configuration information multiplexed onto the content signal (demultiplexing). When the MMT-TLV format is used to multiplex the content signal, the configuration information is described in the MPT (MMT Package Table). The descrambling / demuxing unit 18 outputs the extracted audio and video signals to the audio processing unit 20 and the display processing unit 24, respectively.

[0040] The audio processing unit 20 decodes the audio signal input from the descrambler / demuxer 18 using a predetermined audio decoding method. The predetermined audio decoding method may be a method corresponding to the audio encoding method (e.g., AAC: Advance Audio Coding, MPEG-4 AUDIO, etc.) used to encode the audio signal to be broadcast. The audio processing unit 20 outputs the decoded audio signal or the audio signal input from the control unit 12 to the speaker 60. When audio signals are input simultaneously from the control unit 12 and the descrambler / demuxer 18, the audio processing unit 20 may add (mix) the decoded audio signal and the audio signal input from the control unit 12 and output the audio signal obtained by the addition to the speaker 60.

[0041] The display processing unit 24 decodes the video signal input from the descrambling / demuxing unit 18 using a predetermined video decoding method. The predetermined video decoding method may be a method corresponding to the video encoding method (e.g., High Efficiency Video Coding (HEVC), Advanced Video Coding (AVC), etc.) used to encode the video signal to be broadcast. The display processing unit 24 outputs the decoded video signal or the video signal input from the control unit 12 to the display unit 70. When video signals are input simultaneously from the control unit 12 and the descrambling / demuxing unit 18, the display processing unit 24 may superimpose the decoded video signal on the video signal input from the control unit 12 and output the superimposed video signal to the speaker 60.

[0042] The storage unit 26 is an example of a main memory that constitutes the computer system of the receiver 100. The storage unit 26 is, for example, a volatile memory such as a RAM (Random Access Memory). The storage unit 26 is mainly used as a work area for the control unit 12. That is, the control unit 12 reads a program and parameters to be executed from the flash memory 28, and stores the read program and parameters in the storage unit 26. The control unit 12 temporarily stores an intermediate value obtained by executing a certain process in the storage unit 26, and the stored intermediate value can be used when executing another process.

[0043] Flash memory 28 is an example of an auxiliary storage device that permanently stores various programs and various data. Setting information, parameters, and measurement data such as reception quality used in processing can be stored in flash memory 28. Receiver 100 may include, as an auxiliary storage device, an SSD (Solid Storage Device), an HDD (Hard Disk Drive), or the like instead of or in addition to flash memory 28.

[0044] The digital I / F (Interface) unit 30 inputs and outputs various types of data to and from the transmission / reception module 40. The digital I / F unit 30 outputs a transmission signal input from the control unit 12 to the transmission / reception module 40. The digital I / F unit 30 outputs a reception signal input from the transmission / reception module 40 to the control unit 12.

[0045] When receiver 100 is installed (used for the first time), it performs a channel search in response to a user's operation. During the channel search, receiver 100 detects a broadcast channel whose broadcast signal can be stably received in the reception environment where receiver 100 is installed, and registers broadcast channel information indicating the detected broadcast channel in the receiver itself.

[0046] In the configuration illustrated in FIG. 1, the control unit 12 of the main system unit 10 is instructed to start a channel search by an operation signal input from the operation input unit 50 in response to a user operation. At this time, the control unit 12 reads a control program from the storage unit 26, loads it into the flash memory 28, and starts executing it. The control unit 12 sets the frequency for each broadcast channel of the terrestrial digital broadcasting to the tuner unit 14. The tuner unit 14 outputs an IF signal based on the broadcast signal carried at the set frequency to the demodulator unit 16. The control unit 12 acquires the received signal strength from the tuner unit 14.

[0047] The control unit 12 may determine whether the conditions for channel selection by this device are met based on control information indicated in the control signal obtained from the demodulation unit 16. The control unit 12 monitors reception quality information input from the demodulation unit 16 and determines whether stable reception is possible based on the reception quality information. The control unit 12 sequentially performs these processes for all broadcast channels assigned to terrestrial digital broadcasting. The control unit 12 counts the number of actual broadcast waves and the number of stable broadcast waves based on the presence or absence of broadcast waves for each broadcast channel and the reception quality information. The number of actual broadcast waves corresponds to the number of broadcast channels for which broadcast signals can be received. The number of stable broadcast waves corresponds to the number of broadcast channels that the user can select. The control unit 12 stores the information obtained by the channel search in the flash memory 28 as channel search information.

[0048] After installing receiver 100, control unit 12 periodically performs a channel search to check for the presence of new receivable broadcast waves. For example, a predetermined execution time may be set in control unit 12, and channel search may be performed at the set execution time. Control unit 12 may perform channel search as background processing, regardless of whether the user is watching a broadcast program. For example, if broadcast receiving unit 13 has the ability to simultaneously process broadcast signals carried on multiple broadcast channels, control unit 12 may obtain reception quality information based on broadcast signals carried on channels other than the channel selected by the user.

[0049] Next, an example of the channel search process according to this embodiment will be described. FIG. 2 is a flowchart showing an example of the channel search process according to the first embodiment. (Step S102) When the current time reaches a preset execution time, the control unit 12 starts a channel search. In the channel search, the control unit 12 executes the following process for each broadcast channel.

[0050] (Step S104) The demodulation unit 16 measures the bit rate of the data signal obtained by demodulating the IF signal input from the tuner unit 14. The demodulation unit 16 outputs the measured bit rate to the control unit 12.

[0051] (Step S106) The control unit 12 compares the bit rate measured in the current channel search input from the demodulation unit 16 with the bit rate measured in the previous channel search for the broadcast channel included in the channel search information stored in the flash memory 28. Specifically, the control unit 12 determines whether there is a difference between the previous bit rate and the current bit rate. If it is determined that there is a difference (YES in step S106), the control unit 12 executes the process of step S108. On the other hand, if it is determined that there is no difference (NO in step S106), the control unit 12 changes the broadcast channel to be processed to an unprocessed broadcast channel and returns to step S104. If there is no unprocessed broadcast channel, the process of FIG. 2 ends.

[0052] (Step S108) The control unit 12 stores the previous bit rate and the current bit rate for the broadcast channel to be processed in the flash memory 28 in association with each other.

[0053] (Step S110) The control unit 12 stores the current bit rate and the current date and time in association with each other for the broadcast channel to be processed in the flash memory . If there is an unprocessed broadcast channel among the broadcast channels to be processed, the control unit 12 changes to the unprocessed broadcast channel and executes the process of step S104. On the other hand, if there is no unprocessed broadcast channel, the control unit 12 ends the channel search process of FIG.

[0054] Next, an example of the output determination process according to this embodiment will be described. Fig. 3 is a flowchart showing an example of the output determination process according to the first embodiment. Fig. 3 shows an example of a case where a broadcast channel that provides 2K broadcasting using video with a resolution of 1920 x 1080 as the current broadcast is selected. The data signal includes a 2K signal that transmits the video as the current signal.

[0055] (Step S202) The control unit 12 identifies a broadcast channel designated by an operation signal input from the operation input unit 50, and outputs channel selection information indicating the identified broadcast channel to the tuner unit 14 (2K broadcast channel selection).

[0056] (Step S204) The tuner unit 14 measures the reception strength of the IF signal selected for the broadcast channel specified by the channel selection information from the broadcast signal input from the antenna unit 80. The demodulator 16 demodulates the IF signal obtained from the tuner unit 14 and measures the bit rate, BER, and CN ratio of the data signal extracted from the IF signal as reception quality. The controller 12 acquires the bit rate, BER, and CN ratio measured by the demodulator 16.

[0057] (Step S206) The control unit 12 determines whether the reception condition of the selected broadcast channel is poor based on the acquired reception quality information. In determining whether the reception condition is poor, the control unit 12 determines, for example, whether the BER indicated in the reception quality information is equal to or greater than the Shannon limit. The Shannon limit corresponds to the upper limit of the BER at which the original bit string can be restored by error correction. If the reception condition is determined to be poor (step S206 YES), the control unit 12 ends the processing of FIG. 3. On the other hand, if the reception condition is not poor, that is, if the reception condition is determined to be good (step S206 NO), the control unit 12 executes the processing of step S208.

[0058] Specifically, the control unit 12 refers to the channel search information stored in the flash memory 28 and determines whether a decrease (deterioration) in the CN ratio for the selected channel is greater than a predetermined threshold value, and whether, at the time when this decrease occurs, a decrease in the CN ratio for another channel that is a broadcast channel separate from the selected channel is greater than a predetermined threshold value.

[0059] Alternatively, the control unit 12 refers to the channel search information stored in the flash memory 28 and determines whether a BER decrease (deterioration) greater than a predetermined threshold value for the selected channel has occurred, and whether, at the time when this decrease occurred, a BER decrease greater than a predetermined threshold value for another channel that is a broadcast channel separate from the selected channel has occurred.

[0060] (Step S208) The control unit 12 acquires the bit rate measured by the demodulation unit 16 and determines whether the bit rate has decreased. If it is determined that the bit rate has not decreased (step S208 NO), the control unit 12 ends the process in Fig. 3. On the other hand, if it is determined that the bit rate has decreased (step S208 YES), the control unit 12 executes the process of step S216.

[0061] Specifically, the control unit 12 refers to the channel search information stored in the flash memory 28 and determines whether the current bit rate for the selected channel has decreased from the previous bit rate, and whether, at the time when this decrease occurred, the current bit rate for another channel that is a broadcast channel separate from the selected channel has decreased from the previous bit rate.

[0062] (Step S210) The control unit 12 determines whether it is within X days since the time when a drop in the bit rate for the selected channel was detected. The time when the drop in the bit rate was detected is identified based on the bit rate described in the channel search information and the date and time when that bit rate was acquired. X days is a predetermined number of days, for example, 3 to 5 days. If it is determined that the drop in the bit rate is within X days since it occurred (YES in step S210), the control unit 12 executes the process of step S212. On the other hand, if it is determined that the drop in the bit rate is not within X days since it occurred, that is, if it is determined that more than X days have passed (NO in step S210), the control unit 12 ends the process according to FIG. 3.

[0063] (Step S212) The control unit 12 generates notification information indicating a possibility of degradation in reception quality due to advanced terrestrial broadcasting (segment division method). The control unit 12 outputs a signal indicating the generated notification information to the display processing unit 24. The control unit 12 outputs the notification information, for example, as a notification image representing the notification information to the display processing unit 24 by an image signal (video signal) representing the notification image. The display processing unit 24 displays the notification image (also referred to as a display image) based on the image signal input from the control unit 12 on the display unit 70. The display unit 70 displays the notification information (notification image) indicating a possibility of degradation in reception quality due to advanced terrestrial broadcasting using the segment division method.

[0064] Next, an example of a display image displayed by the display unit 70 according to this embodiment will be described. Fig. 4 is a diagram showing an example of a display image displayed by the display unit according to the first embodiment. The display image shown in FIG. 4 may be displayed immediately after tuning in to a broadcast program. The display image includes reception status information, received signal quality, and notification information for the selected channel. The notification information may include, for example, an area surrounded by a dashed frame and a message within the area that reads, "There may be reception interference due to the start of Advanced Terrestrial Broadcasting (Segmented Broadcasting). This is due to the broadcasting method and does not affect your television receiver. Please check the website or other means to see if Advanced Terrestrial Broadcasting (Segmented Broadcasting) has started in your area." For example, presenting the notification information to a user can alert them to the possibility of a decrease in reception quality due to the Advanced Terrestrial Broadcasting (Segmented Broadcasting) method, thereby informing them to improve their reception environment. Furthermore, this can reduce inquiries to broadcasters providing broadcast services on the channel, or to receiver manufacturers or sellers, thereby improving user convenience.

[0065] The notification information may include location information of guidance information indicating the start of advanced terrestrial broadcasting (segment division method) on the selected channel. Such location information may include a link to the address of a web server where the guidance information is stored (e.g., a uniform resource locator (URL)). When detecting a link press, the control unit 12 may use the digital I / F 30 and the transceiver module 40 to request guidance information from a device indicated by the URL and acquire the requested guidance information. In this application, "press" refers not only to an actual "press" but also to the input of an operation signal indicating a position within the area. The control unit 12 may generate a video signal representing a display image including the guidance information and output it to the display processing unit 24. The display processing unit 24 may cause the display unit 70 to display the video signal representing a display image including the guidance information.

[0066] The display image shown in FIG. 4 also displays "Terrestrial-2" as the selected channel. "Terrestrial-2" refers to a channel for terrestrial digital broadcasting. The reception status information includes a reception status of "A" and the description of that status, "Good." The control unit 12 selects a reception status level corresponding to the measured received signal quality from a plurality of preset reception status levels. The control unit 12 presets different ranges of received signal quality and descriptions for each reception status level, and can identify a reception status level and description corresponding to a range that includes the measured received signal quality.

[0067] Also, in FIG. 4, the received signal quality is expressed using an approximate conversion value. The approximate conversion value is equivalent to, for example, 2.6 times the CN ratio expressed in decibels. The current value of the approximate conversion value is displayed as "80." The current value is displayed together with the recommended value range using a bar graph. The recommended value range is between 60 and 100, and is displayed as the "range in which stable viewing is possible." In other words, in the example of receiver 100 shown in the figure, this indicates that terrestrial broadcasting can be viewed stably. Note that if the current value is lower than the recommended value range, the user is prompted to check the reception environment.

[0068] FIG. 5 is a diagram showing another example of a display image displayed by the display unit according to the first embodiment. The display image shown in Figure 5 shows the reception status of broadcast channels, including terrestrial digital broadcasting and satellite broadcasting. The reception status information is displayed as one of the codes A to E, indicating the reception strength and reception status level for each broadcast channel. However, for terrestrial digital broadcasting (terrestrial digital), the values ​​shown are the past reception strength values ​​(YYYY year, MM month, DD day) and the current reception strength values. For satellite broadcasting (BS / CS antenna), the current reception quality and reception strength values ​​are displayed. However, in the example of FIG. 5, the notification information includes a message indicating the possibility of a degradation in reception quality due to advanced terrestrial broadcasting (segment division method) for the currently selected channel.

[0069] If the receiver 100 has a recording function, the scheduled broadcast channel may be tuned in immediately before the scheduled recording start time. In this case, the user is not expected to view the screen of the display unit 70. Therefore, the control unit 12 may present notification information using the user notification function. More specifically, the control unit 12 generates a video signal representing an icon indicating the presence of a message. The control unit 12 outputs the generated video signal to the display processing unit 24. The display processing unit 24 displays the input video signal on the display unit 70. The control unit 12 may continue to display the icon even after the recording end time. The icon may be configured to represent, for example, a stylized envelope, letter, or the like. When the control unit 12 detects a press on the icon, it outputs a video signal representing a display image including a message representing notification information for clearing the display of the icon to the display processing unit 24. The display processing unit 24 displays the video signal on the display unit 70. At this time, the notification image including the message representing the notification information is displayed on the display unit 70.

[0070] In this way, the broadcast receiving unit 13 of the receiver 100 according to the first embodiment of the present invention measures a reception quality value, which is the reception quality of a broadcast data signal, and the bit rate of the data signal. When the reception quality value is good, the control unit 12 outputs notification information indicating the possibility of a decrease in reception quality due to advanced terrestrial broadcasting using the segment division method, based on the fact that the bit rate has decreased after a specific point in time compared to the bit rate before the specific point in time.

[0071] Furthermore, the broadcast receiving unit 13 of the receiver 100 according to the first embodiment receives a TMCC signal including information on the number of segments. The control unit 12 outputs notification information indicating the possibility of a decrease in reception quality due to advanced terrestrial broadcasting using the segment division method, based on the fact that the number of segments has decreased after a specific point in time compared to before the specific point in time.

[0072] This makes it possible to make users aware of the possibility of a decline in reception quality due to advanced terrestrial broadcasting using segment division. This allows users to be informed of improvements to their reception environment. Furthermore, it is possible to reduce inquiries to broadcasters providing broadcast services on the channel, or to manufacturers or sellers of receivers, thereby improving user convenience.

[0073] <Second embodiment> Next, a second embodiment of the present invention will be described with reference to Fig. 6. In the second embodiment, differences between Fig. 6 and Fig. 3 of the first embodiment will be mainly described. Explanations of parts common to the first and second embodiments will be omitted.

[0074] FIG. 6 is a flowchart showing an example of the output determination process according to the second embodiment. (Step S302) The control unit 12 identifies a broadcast channel designated by an operation signal input from the operation input unit 50, and outputs channel selection information indicating the identified broadcast channel to the tuner unit 14 (2K broadcast channel selection).

[0075] (Step S304) The tuner unit 14 measures the reception strength of the IF signal selected for the broadcast channel specified by the channel selection information from the broadcast signal input from the antenna unit 80. The demodulator 16 demodulates the IF signal obtained from the tuner unit 14 and measures the bit rate, BER, and CN ratio of the data signal extracted from the IF signal as reception quality. The controller 12 acquires the bit rate, BER, and CN ratio measured by the demodulator 16.

[0076] (Step S306) The control unit 12 determines whether the reception condition (reception quality) of the selected broadcast channel is poor based on the acquired reception quality information. If the reception condition is determined to be poor (step S306 YES), the control unit 12 ends the processing in Fig. 6. On the other hand, if the reception condition is not poor, that is, if the reception condition is determined to be good (step S306 NO), the control unit 12 executes the processing of step S308.

[0077] (Step S308) The control unit 12 acquires the bit rate measured by the demodulation unit 16 and determines whether the bit rate has decreased. If it is determined that the bit rate has not decreased (step S308 NO), the control unit 12 ends the process in Fig. 6. On the other hand, if it is determined that the bit rate has decreased (step S308 YES), the control unit 12 executes the process of step S310.

[0078] (Step S310) The control unit 12 refers to the channel search information stored in the flash memory 28 and determines whether the bit rate of the selected channel has decreased Y or more times in succession from the specific day on which the bit rate decrease occurred until that point in time. Here, Y is a predetermined integer equal to or greater than 2 (e.g., 3 to 5). The specific day is, for example, the day on which advanced terrestrial broadcasting using the segment division method started. If this has occurred Y or more times in succession (YES in step S310), the control unit 12 executes the process of step S312. If this has not occurred Y or more times in succession, i.e., if it has occurred less than Y times (NO in step S310), the control unit 12 ends the process of FIG. 6.

[0079] (Step S312) It is determined whether or not it has been within X days since the time when a drop in the bit rate was detected for the selected channel. The time when the drop in the bit rate was detected is identified based on the bit rate described in the channel search information and the date and time when that bit rate was acquired. X days is a predetermined number of days, for example, 3 to 5 days. If it is determined that the drop in the bit rate is within X days since it occurred (step S312 YES), the control unit 12 executes the process of step S314. On the other hand, if it is determined that the drop in the bit rate is not within X days since it occurred, that is, if it is determined that more than X days have passed (step S312 NO), the control unit 12 ends the process according to FIG. 6.

[0080] (Step S314) The control unit 12 generates notification information indicating the possibility of degradation in reception quality due to advanced terrestrial broadcasting (segment division method). The control unit 12 outputs a signal indicating the generated notification information to the display processing unit 24. The control unit 12 outputs the notification information, for example, as a notification image representing the notification information to the display processing unit 24 by an image signal (video signal) representing the notification image. The display processing unit 24 displays the notification image (also referred to as a display image) based on the image signal input from the control unit 12 on the display unit 70. The display unit 70 displays the notification information (notification image) indicating the possibility of degradation in reception quality due to advanced terrestrial broadcasting using the segment division method.

[0081] In this way, the broadcast receiving unit 13 of the receiver 100 according to the second embodiment of the present invention measures a reception quality value, which is the reception quality of a broadcast data signal, and the bit rate of the data signal. When the reception quality value is good, the control unit 12 outputs notification information indicating the possibility of a degradation in reception quality due to advanced terrestrial broadcasting using the segment division method, based on the fact that the bit rate has decreased after a specific point in time compared to the bit rate before the specific point in time.

[0082] Furthermore, the broadcast receiving unit 13 of the receiver 100 according to the first embodiment receives a TMCC signal including information on the number of segments. The control unit 12 outputs notification information indicating the possibility of a decrease in reception quality due to advanced terrestrial broadcasting using the segment division method, based on the fact that the number of segments has decreased after a specific point in time compared to before the specific point in time.

[0083] In this way, notification information is output when a predetermined number of days have passed since a specific date on which a drop in bit rate occurred, thereby preventing the output of notification information from becoming a regular occurrence. Also, notification information is output when a drop in bit rate occurs Y or more times in succession, thereby improving the accuracy of determination when outputting notification information and improving user convenience.

[0084] <Third embodiment> Next, a third embodiment of the present invention will be described with reference to Fig. 7. In the third embodiment, differences between Fig. 7 and Fig. 3 of the first embodiment will be mainly described. Explanations of parts common to the first and third embodiments will be omitted.

[0085] FIG. 7 is a flowchart showing an example of the output determination process according to the third embodiment. (Step S402) The control unit 12 identifies a broadcast channel designated by an operation signal input from the operation input unit 50, and outputs channel selection information indicating the identified broadcast channel to the tuner unit 14 (2K broadcast channel selection).

[0086] (Step S404) The tuner unit 14 measures the reception strength of the IF signal selected for the broadcast channel specified by the channel selection information from the broadcast signal input from the antenna unit 80. The demodulator 16 demodulates the IF signal obtained from the tuner unit 14 and measures the bit rate, BER, and CN ratio of the data signal extracted from the IF signal as reception quality. The controller 12 acquires the bit rate, BER, and CN ratio measured by the demodulator 16.

[0087] (Step S406) The control unit 12 determines whether the reception state (reception quality) of the selected broadcast channel is poor based on the acquired reception quality information. If the reception state is determined to be poor (step S406 YES), the control unit 12 ends the processing in Fig. 7. On the other hand, if the reception state is not poor, that is, if the reception state is determined to be good (step S406 NO), the control unit 12 executes the processing of step S408.

[0088] (Step S408) The control unit 12 acquires the bit rate measured by the demodulation unit 16 and determines whether the bit rate has decreased. If it is determined that the bit rate has not decreased (step S408 NO), the control unit 12 ends the process in Fig. 7. On the other hand, if it is determined that the bit rate has decreased (step S408 YES), the control unit 12 executes the process of step S410.

[0089] (Step S410) It is determined whether or not it has been within X days since the time when the drop in bit rate for the selected channel was detected. If it is determined that the drop in bit rate is within X days after the occurrence (YES in step S410), the control unit 12 executes the process of step S412. On the other hand, if it is determined that the drop in bit rate is not within X days after the occurrence, that is, if it is determined that more than X days have passed (NO in step S410), the control unit 12 ends the process according to FIG.

[0090] (Step S412) The control unit 12 determines whether the period from the start of presentation of notification information indicating the possibility of degradation of reception quality due to advanced terrestrial broadcasting using the segment division method to that point in time is within Z days. Z indicates a predetermined number of days (for example, 3 to 7 days). If it is determined that it is within Z days (YES in step S412), the control unit 12 executes the process of step S414. On the other hand, if it is determined that it exceeds Z days (NO in step S412), the control unit 12 ends the process of FIG. 6.

[0091] (Step S414) The control unit 12 generates notification information indicating a possibility of degradation in reception quality due to advanced terrestrial broadcasting (segment division method). The control unit 12 outputs a signal indicating the generated notification information to the display processing unit 24. The control unit 12 outputs the notification information, for example, as a notification image representing the notification information to the display processing unit 24 by an image signal (video signal) representing the notification image. The display processing unit 24 displays the notification image (also referred to as a display image) based on the image signal input from the control unit 12 on the display unit 70. The display unit 70 displays the notification information (notification image) indicating a possibility of degradation in reception quality due to advanced terrestrial broadcasting using the segment division method.

[0092] In this way, the broadcast receiving unit 13 of the receiver 100 according to the third embodiment of the present invention measures a reception quality value, which is the reception quality of a broadcast data signal, and the bit rate of the data signal. When the reception quality value is good, the control unit 12 outputs notification information indicating the possibility of a degradation in reception quality due to advanced terrestrial broadcasting using the segment division method, based on the fact that the bit rate has decreased after a specific point in time compared to the bit rate before the specific point in time.

[0093] Furthermore, the broadcast receiving unit 13 of the receiver 100 according to the first embodiment receives a TMCC signal including information on the number of segments. The control unit 12 outputs notification information indicating the possibility of a decrease in reception quality due to advanced terrestrial broadcasting using the segment division method, based on the fact that the number of segments has decreased after a specific point in time compared to before the specific point in time.

[0094] By doing this, output of the notification information can be suppressed if Z days or more have passed since the start of presentation of the notification information, and therefore the notification information can be prevented from being displayed constantly.

[0095] In the above description, the case where notification information is output based on a decrease in reception quality and bit rate has been described, but information on the number of segments included in the TMCC signal may be referenced, and based on that information on the number of segments, the number of segments after a specific point in time may be compared with the number of segments before the specific point in time. In this case, when the number of segments decreases after a specific point in time compared to before, receiver 100 may output notification information to the notification unit indicating the possibility of a decrease in the reception quality of the data signal due to advanced terrestrial broadcasting using the segment division method.

[0096] As described above, the receiver 100 of this embodiment includes a broadcast receiving unit that measures a reception quality value, which is the reception quality of a broadcast data signal, and the bit rate of the data signal, and a control unit that, when the reception quality value is good, outputs notification information to the notification unit that indicates the possibility of a decrease in the reception quality of the data signal due to advanced terrestrial broadcasting using the segment division method, based on the fact that the bit rate has decreased after a specific point in time compared to the bit rate before the specific point in time.

[0097] This configuration makes it possible to estimate degradation of reception quality caused by advanced terrestrial broadcasting using the segment division method based on the reception quality and bit rate of the data signal. Furthermore, notification information can be used to notify the user that degradation of reception quality of the data signal may be caused by advanced terrestrial broadcasting using the segment division method. Therefore, receiver 100 can notify the user that the cause of degradation of reception quality is relatively unlikely to be a malfunction of the broadcast service or the receiver. Furthermore, unnecessary inquiries based on the assumption of a malfunction of the broadcast service or the receiver can be suppressed, thereby reducing the burden on broadcasters and manufacturers or sellers of receiver 100 to respond to users.

[0098] The receiver 100 also includes a broadcast receiving unit that receives a TMCC signal including information on the number of segments, and a control unit that outputs notification information to the notification unit indicating the possibility of a decrease in the reception quality of the data signal due to advanced terrestrial broadcasting using the segment division method, based on the fact that the number of segments has decreased after a specific point in time compared to before the specific point in time.

[0099] This configuration allows the reduction in segments to be ascertained by referring to segment information contained in the TMCC signal, and therefore, based on the reduction in the number of segments, it is possible to estimate the degradation of reception quality caused by advanced terrestrial broadcasting using the segment division method. Furthermore, the notification information can be used to notify the user that the degradation in reception quality of the data signal is likely to be caused by advanced terrestrial broadcasting using the segment division method. Therefore, the receiver 100 can notify the user that the cause of the degradation in reception quality is relatively unlikely to be a malfunction of the broadcast service or the receiver. Furthermore, unnecessary inquiries based on the assumption of a malfunction of the broadcast service or the receiver can be suppressed, thereby reducing the burden on broadcasters, manufacturers, or sellers of the receiver 100 to respond to users.

[0100] The control unit 12 outputs notification information to the notification unit if it is within a predetermined period (for example, within X days) from a specific point in time when the bit rate has decreased.

[0101] According to this configuration, it is possible to suppress the output of notification information due to an accidental drop in bit rate, thereby improving the accuracy of notification of a drop in reception quality caused by advanced terrestrial broadcasting using the segment division method.

[0102] The control unit 12 outputs notification information to the notification unit when a drop in the bit rate occurs a predetermined number of times (for example, Y times or more) consecutively, including at a specific point in time.

[0103] According to this configuration, it is possible to suppress the output of notification information due to an accidental drop in bit rate, thereby improving the accuracy of notification of a drop in reception quality caused by advanced terrestrial broadcasting using the segment division method.

[0104] The broadcast receiving unit 13 may measure the signal-to-noise ratio as an index of reception quality. This quantifies the degree of noise components relative to the data signal.

[0105] The broadcast receiving unit 13 may measure the bit error rate as an index of reception quality. This quantifies the degree of bit error in the data signal.

[0106] Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configurations are not limited to the above-described embodiments and modifications, and include designs that do not deviate from the gist of the present invention. The configurations described in the above-described embodiments can be combined in any manner.

[0107] The above description exemplifies a case in which the receiver 100 provides broadcast services based on current broadcasting but not on advanced broadcasting. However, this is not limiting. The receiver 100 may also have a function for providing broadcast services based on advanced broadcasting. In this case, the broadcast receiving unit 13 modulates the demodulated IF signal using the modulation method used for modulation. The broadcast receiving unit 13 subtracts the IF signal assigned to the high-power hierarchical layer reconstructed by modulation from the IF signal input from the antenna unit 80, and extracts the IF signal assigned to the low-power hierarchical layer. The broadcast receiving unit 13 demodulates the advanced broadcasting data signal assigned to the extracted IF signal using a demodulation method corresponding to the modulation method used for modulation. When advanced broadcasting is selected in response to user operation, the broadcast receiving unit 13 may cause the notification unit 55 to present content for the advanced broadcasting based on a content signal separated from the demodulated data signal. When current broadcasting is selected in response to user operation, the broadcast receiving unit 13 causes the notification unit 55 to present notification information according to the above method.

[0108] Furthermore, some components of the receiver 100 may be omitted, or other components may be added. For example, in the receiver 100, any one or a combination of the transceiver module 40, operation input unit 50, speaker 60, and display unit 70 may not necessarily be provided integrally in the receiver 100, as long as they can be connected to the main system unit 10 so as to be able to input and output various data. For example, in a receiver 100 configured as a dedicated television receiver, the transceiver module 40 may be omitted. In a receiver 100 configured as a set-top box or a recorder, the display unit 70 may be omitted. The receiver 100 may be provided with an antenna unit 80 and configured integrally.

[0109] Alternatively, a program for implementing some of the functions of the receiver 100 described above, such as some or all of the functions of the control unit 12, may be recorded on a computer-readable recording medium (e.g., flash memory 28), and the program recorded on the recording medium may be loaded into a computer system and executed to implement those functions. The term "computer system" as used herein includes hardware such as an OS and peripheral devices. The term "computer system" may also include multiple computer devices connected via a network, including communication lines such as the Internet, a WAN, a LAN, and a dedicated line. [Explanation of symbols]

[0110] 1 Receiving System 10 Main System Section 12 Control Unit 13 Broadcast receiving unit 14 Tuner section 16 Demodulation section 18 Descramble Demax Section 20 Audio processing unit 24 Display processing section 28 Flash Memory 30 Digital I / F 40 Transmitting and receiving module 50 Operation input section 55 Notification Department 60 speakers 70 Display section 80 Antenna section 84 Booster 100 receivers

Claims

1. a broadcast receiving unit for receiving a TMCC signal including information on the number of segments; a control unit that outputs notification information to a notification unit, the notification information indicating a possibility of a decrease in the reception quality of the data signal due to the segment division type advanced terrestrial broadcasting, based on the fact that the number of segments indicated by the information included in the TMCC signal has decreased after a specific point in time compared to the number of segments before the specific point in time; A receiver comprising:

2. a broadcast receiving unit that measures a reception quality value that is the reception quality of a broadcast data signal and a bit rate of the data signal; a control unit that outputs notification information indicating a possibility of a decrease in reception quality of the data signal due to segment division advanced terrestrial broadcasting to a notification unit, based on the fact that the bit rate has decreased from a specific point in time onward compared to the bit rate before the specific point in time when the reception quality value is good; and A receiver comprising:

3. the control unit outputs the notification information to the notification unit if a predetermined period has not elapsed since the specific time point at which the bit rate has decreased.

3. The receiver of claim 2.

4. the control unit outputs the notification information to the notification unit when the decrease in the bit rate occurs a predetermined number of times consecutively, including at the specific time point.

3. The receiver of claim 2.

5. The broadcast receiving unit measures a signal-to-noise ratio as an index of the reception quality.

5. The receiver of claim 4.

6. The broadcast receiving unit measures a bit error rate as an index of the reception quality.

5. The receiver of claim 4.

7. On the computer, a broadcast receiving step of receiving a TMCC signal including information on the number of segments; a control step of outputting notification information to a notification unit, based on the fact that the number of segments indicated by the information included in the TMCC signal has decreased after a specific point in time compared to the number of segments before the specific point in time, which indicates a possibility of a decrease in reception quality of a broadcast data signal caused by advanced terrestrial broadcasting using a segment division method; A program to execute.

8. On the computer, a broadcast reception step of measuring a reception quality value, which is the reception quality of a broadcast data signal, and a bit rate of the data signal; a control step of outputting notification information indicating a possibility of degradation of reception quality due to segment division type advanced terrestrial broadcasting to a notification unit, based on the fact that the bit rate has decreased after a specific time point compared to the bit rate before the specific time point when the reception quality value is good; A program to execute.

9. The receiver, a broadcast receiving step of receiving a TMCC signal including information on the number of segments; a control step of outputting notification information to a notification unit, based on the fact that the number of segments indicated by the information included in the TMCC signal has decreased after a specific point in time compared to the number of segments before the specific point in time, which indicates a possibility of a decrease in reception quality of a broadcast data signal caused by advanced terrestrial broadcasting using a segment division method; A receiving method having the following features.

10. The receiver, a broadcast reception step of measuring a reception quality value, which is the reception quality of a broadcast data signal, and a bit rate of the data signal; a control step of outputting notification information indicating a possibility of degradation of reception quality due to segment division type advanced terrestrial broadcasting to a notification unit, based on the fact that the bit rate has decreased after a specific time point compared to the bit rate before the specific time point when the reception quality value is good; A receiving method having the following features.

Images