JP7316578B2 - IP broadcast receiving device and IP broadcast receiving method - Google Patents

Description

The present disclosure relates to an IP broadcast receiving apparatus and an IP broadcast receiving method for receiving IP (Internet Protocol) broadcast content.

2. Description of the Related Art Conventionally, there has been known a digital broadcast receiver that selectively receives broadcast radio waves from narrowband to broadband by combining a plurality of narrowband signals. This digital broadcast receiver comprises a receiving circuit including a band-pass filter having a band switching function, reception quality detection means for detecting reception quality, and a receiver for determining reception quality according to the currently selected bandwidth. threshold changing means for changing a plurality of thresholds; means for classifying the detected reception quality into a plurality of stages of reception quality levels determined by the plurality of thresholds; and the classified reception quality display means for displaying the level on a display screen in a display mode that changes in stages.

JP-A-2005-123859

The present disclosure provides an IP broadcast receiving apparatus and an IP broadcast receiving method that visualize the quality of received data in IP broadcast and make it easy for both viewers and business operators to check the quality state.

One aspect of the present disclosure is an IP broadcast receiver that receives a stream using IP (Internet Protocol) packets, comprising: a receiving unit that receives the stream via a network; and a plurality of IP packets in the stream. a calculating unit for calculating a value indicating the reception quality of the stream based on the packet reception information; and processing the value indicating the reception quality to indicate the reception quality a generating unit that generates information; a display unit that displays information indicating the reception quality ; wherein the packet reception information is stored in the storage unit while the stream is being reproduced or recorded, and the packet reception information is stored in the storage unit while the stream is not being reproduced or recorded. It is an IP broadcast receiving device that does not accumulate data .

One aspect of the present disclosure is an IP broadcast receiving method for an IP broadcast receiving apparatus that receives a stream using IP packets, the method receiving the stream via a network, and receiving a plurality of IP packets in the stream. obtaining reception information, calculating a value indicating the reception quality of the stream based on the packet reception information, processing the value indicating the reception quality to generate information indicating the reception quality, and obtaining the reception quality is displayed, the packet reception information is accumulated during a period in which the power of the IP broadcast receiver is on and the stream is being reproduced or recorded, and the stream is being reproduced or recorded. In the IP broadcast reception method, the packet reception information is not stored during the non-stored period.

Advantageous Effects of Invention According to the present disclosure, the quality of received data in IP broadcasting can be visualized, and both viewers and business operators can easily check the quality state.

1 is a block diagram showing a configuration example of an IP broadcasting system according to a first embodiment; FIG. Flowchart showing an example of operation when accumulating a reception log by a receiver Flowchart showing an example of log accumulation processing Diagram showing an example of information accumulated in the log accumulation table during normal operation Flowchart showing an operation example when data analysis is performed based on a reception log by a receiver An example of information accumulated in the log accumulation table when there is packet loss Flowchart showing an example of packet loss calculation processing An example of information accumulated in the log accumulation table when there is packet arrival fluctuation Flowchart showing an example of packet arrival fluctuation calculation processing A diagram showing an example of an arrival interval table Diagram for explaining an example of jitter calculation Diagram showing an example of information accumulated in the result management table Diagram showing an example of reception quality display

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid unnecessary verbosity in the following description and to facilitate understanding by those skilled in the art. It should be noted that the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure and are not intended to limit the claimed subject matter thereby.

(Circumstances leading to obtaining one form of the present disclosure)
In recent years, with the spread of high-speed network lines such as FTTH (Fiber To The Home)/HFC (Hybrid Fiber Coaxial), pay broadcasting service providers are increasingly providing IP broadcasting services using high-speed network lines. In the case of broadcasting via conventional broadcast waves, a receiver generally has a function of measuring radio wave intensity with a tuner and displaying the radio wave intensity numerically. On the other hand, in IP broadcasting, ONUs (Optical Network Units) receive line signals when FTTH is used, and CMs (Cable Modems) receive line signals when HFC is used. Then, the ONU or CM and the receiver located ahead of the ONU or CM are connected by a short-distance line using network equipment in the home. Therefore, measurement of the signal strength of network communication at the receiver is not useful as an index representing the state of reception of line signals. Therefore, in IP broadcasting, it is desirable to measure the packet loss rate and packet arrival fluctuation of the stream (IP stream) flowing to the receiver and present them to the user.

Also, in the packet loss rate, for example, it is measured whether B packets are lost with respect to reception of A packets. Furthermore, since packet loss generally occurs with a very small frequency, it can be a difficult indicator for ordinary users to understand, for example, 10 to some power.

Also, in the packet arrival fluctuation, for example, when C packets are received, how long the packet arrival interval is on average and how much the packet arrival interval narrows or widens is measured. Therefore, a packet arrival fluctuation value of 100 msec may be an index that is difficult for general users to understand.

In the following embodiments, an IP broadcast receiving apparatus and an IP broadcast receiving method that can visualize the quality of received data in IP broadcasting and make it easy for both viewers and business operators to check the quality state will be described.

IP broadcasting in the following embodiments may include independent broadcasting (IP independent broadcasting) performed by the distribution side using IP packets. Also, IP broadcasting may include that the distribution side acquires program content via broadcast waves and retransmits the program content using IP packets (IP retransmission).

(First embodiment)
FIG. 1 is a block diagram showing a configuration example of an IP broadcast system 5 according to the first embodiment. IP broadcasting system 5 includes receiver 100 , distribution server 200 , router 300 and transmission facility 400 . The receiver 100 may be installed in the indoor TN. A receiving facility 150 and a router 160 may be installed in the home TN in addition to the receiver 100 .

Receiver 100 may be, for example, a set-top box, a TV broadcast receiver, or a recorder installed in each home. The receiver 100 receives the IP packets of the program content stream sent out by the distribution server 200 via the network (IP network). If the receiver 100 is a set-top box or recorder, the receiver 100 may output program content to the TV broadcast receiver or recorder via, for example, HDMI (registered trademark) (High-Definition Multimedia Interface). A TV broadcast receiver can reproduce program content, and a recorder can record (for example, record, record, and store data) the program content. Note that the receiver 100 itself may be capable of reproducing or recording the acquired program content.

Distribution server 200 and receiver 100 are connected via a network. The network may include the Internet, a closed network installed by a communication carrier, or a closed network installed by a cable television station. The network may include an FTTH network or an HFC network. In the FTTH network, all data is transmitted via optical fibers from the transmission facility 400 to the reception facility (optical network unit (V-ONU)) installed in the subscriber's home TN. In the HFC network, data is transmitted from the transmission equipment 400 to the optical nodes via optical fibers, and from the optical nodes to the subscriber's home TN via coaxial cables.

The distribution server 200 may be installed, for example, at the center of an operator who independently broadcasts program content. The distribution server 200 generates an IP packet stream for IP broadcasting and sends (transmits) it.

The distribution server 200 receives a video stream including video data, an audio stream including audio data, a data broadcasting stream including data broadcasting data, and SI (Service Information)/PSI (Program Specific Information) from broadcasting head-end equipment (not shown). ) may receive and multiplex data inputs to produce a stream of program content. That is, program content may include video data, audio data, data broadcasting data, and SI/PSI data. The SI/PSI data includes at least one of SI and PSI, and may include program listings, caption data, and the like. The video data is H.264. H.265 system (HEVC (High Efficiency Video Coding) system) or the like may be used. Audio data may be encoded by MPEG-2 AAC (Advanced Audio Coding), MPEG-4 AAC, MPEG-4 ALS (Audio Lossless Coding), or the like. The multiplexing method here may be MMT (MPEG Media Transport), TLV (Type Length Value) method, or the like. The distribution server 200 transmits (distributes) a stream containing program content.

Router 300 relays transmission of a stream from distribution server 200 to receiver 100 via transmission facility 400 . The router 300 may route and transmit streams based on the network conditions of the networks to which it is connected. Depending on the route selected, packet loss (packet loss) may occur in which the IP packet does not reach the receiving side, or packet arrival delay or packet arrival fluctuation may occur in which the timing at which the IP packet arrives at the receiving side is delayed. Note that the packet arrival delay includes constant delay. Since the same equipment is used on the network, the same delay occurs. Fluctuations in this delay result in packet arrival fluctuations.

The transmission facility 400 converts an electrical signal obtained from the distribution server 200 via the router 300 into an optical signal, and transmits the optical signal to the reception facility 150 via the network. If the network is an FTTH network, the transmission equipment 400 may be an OLT (Optical Line Terminal). If the network is an HFC network, the transmission facility 400 may be CMTS (Cable Modem Termination System).

The receiving facility 150 converts the optical signal obtained from the transmission facility 400 via the network into an electrical signal and transmits the electrical signal to the receiver 100 via the router 160 . If the network is an FTTH network, the receiving equipment 150 may be an ONU (Optical Network Unit). If the network is an HFC network, the receiving equipment 150 may be a CM (Cable Modem).

Router 160 relays the transmission of the stream from distribution server 200 to receiver 100 via receiving facility 150 . Router 160 may route and transmit streams based on the network conditions of the network.

The receiver 100 includes a control unit 102, an IP communication unit 104, a clock 105, a demultiplexer 106, a video decoder 108, an audio decoder 110, a data processing unit 112, an IP log accumulation unit 114, an IP data analysis unit 116, and a display unit 118. Prepare.

The control section 102 controls each section of the receiver 100 . For example, the control section 102 may control communication by the IP communication section 104 . The control unit 102 may control information accumulation in the IP log accumulation unit 114 . Control unit 102 may assist data analysis by IP data analysis unit 116 . The control unit 102 performs control and calculation for display by the display unit 118 .

The IP communication unit 104 communicates data using IP packets. The IP communication unit 104 receives the program content stream from the distribution server 200 and sends it to the demultiplexer 106 . The clock 105 keeps track of the reception times of IP packets in the stream. The timed reception time may be stored in the IP log storage unit 114 .

The demultiplexer 106 divides the multiplexed program content stream from the IP communication unit 104 into a plurality of streams. Specifically, the demultiplexer 204 divides the program content stream into a video stream, an audio stream, a data broadcasting stream, and SI (Service Information)/PSI (Program Specific Information) data. The division method by the demultiplexer 106 may be a method corresponding to the multiplexing method of the distribution server 200 .

The video decoder 108 acquires the video stream from the demultiplexer 106 and decodes the video data of the video stream. Audio decoder 110 obtains the audio stream from demultiplexer 106 and decodes the audio data of the audio stream. The data processing unit 112 acquires the data broadcasting stream from the demultiplexer 106 and decodes the data broadcasting data of the data broadcasting stream. A data processing unit 112 acquires SI/PSI data from the demultiplexer 106 . The SI/PSI data includes program management data, and may include, for example, EPG (Electronic Program Guide) and caption data.

The IP log accumulation unit 114 acquires and accumulates packet reception information including information regarding the reception of IP packets included in the stream received by the IP communication unit 104 . Since the packet reception information functions as a reception log, it is also called a reception log. The reception log is referred to by each component (for example, IP data analysis unit 116). The packet reception information or reception log may also include timed reception information.

IP data analysis unit 116 acquires the reception log accumulated in IP log accumulation unit 114 and performs data analysis based on the reception log. Data analysis includes reception quality analysis of reception of IP packets. Reception quality may include packet loss information about packet loss (eg, packet loss rate), packet arrival fluctuation information about packet reception (arrival) fluctuations (eg, packet arrival fluctuation value), and other reception qualities.

The display unit 118 displays various data. The display unit 118 may display information based on the results of data analysis. For example, the display unit 118 may display information indicating reception quality.

Next, an example of channel selection will be described.

The IP communication unit 104 may select a channel and receive program content when the receiver 100 is activated. In this case, when the receiver 100 is activated, the control unit 102 sends to the IP communication unit 104 a channel selection instruction designating an IP multicast multicast address indicating a channel to be selected. IP communication unit 104 transmits a join message (for example, IGMP (Internet Group Management Protocol) join message) to a designated multicast address to a higher-level network device (for example, distribution server 200), and receives an IP multicast stream from the higher-level network device. receive. An IP multicast stream is an example of a stream.

Further, when the IP communication unit 104 receives a channel selection instruction from the receiver 100, the IP communication unit 104 may select a channel and receive program content. In this case, when receiving a channel selection instruction by remote control control, reserved recording, or reserved viewing control (not shown), the control unit 102 receives the channel selection instruction based on a correspondence table (not shown) between channels and IP multicast addresses. , and sends a tuning change instruction to the IP communication unit 104 . The IP communication unit 104 that has received the channel selection change instruction transmits, for example, an IGMP leave group message to an upper router (eg, the router 160) in order to leave the currently received IP multicast. After that, the IP communication unit 104 transmits a join message to the new IP multicast address to be selected, and receives the corresponding IP multicast stream. Note that the information of the above correspondence table may be held in a memory (not shown) included in the receiver 100 .

Next, an example of accumulation of reception logs will be described.

The IP communication unit 104 may cause the IP log storage unit 114 to store the reception log based on the reception log storage instruction from the control unit 102, for example.

The control unit 102 may always issue a storage instruction while the main power of the receiver 100 is on. That is, the control unit 102 issues a channel selection instruction and a reception log accumulation instruction to the IP communication unit while the main power of the receiver 100 is on (the period in which the power is turned on, the period in which the receiver 100 is operable). You can send it to 104. By constantly accumulating the reception log, the receiver 100 can ensure a long packet monitoring time even if the probability of occurrence of packet loss as reception quality is low, so packet loss can be easily detected.

In addition, the control unit 102 may issue a reception log accumulation instruction during a period when the receiver 100 is turned on but not activated (a period during which no program content is viewed or recorded). After that, when the viewing state or the recording state is entered by remote control operation or the like, that is, when the receiver 100 receives a remote control operation signal and starts reproducing or recording the program content, the control unit 102 issues an instruction to stop accumulation of the reception log. It may be sent to IP communication section 104 .

Also, the control unit 102 may send an instruction to accumulate a reception log to the IP communication unit 104 during a period in which the receiver 100 is powered on and activated (while the program content is being used or recorded). .

FIG. 2 is a flow chart showing an operation example when the receiver 100 accumulates a reception log. Note that the memory of the receiver 100 holds a log accumulation flag, and the initial state of the log accumulation flag is off.

The IP communication unit 104 receives instructions from other components of the receiver 100 and devices other than the receiver 100 (S101). The IP communication unit 104 determines whether or not the received instruction is a reception log accumulation instruction (S102).

IP communication unit 104 sets the log accumulation flag to ON when the received instruction is an instruction to accumulate a reception log (S103).

The IP communication unit 104 adds an all-zero record to the corresponding item in the log accumulation table T1 (S104). An all-zero record is data in which a value of 0 is set for all items held in the log accumulation table T1 (data for one row of the log accumulation table T1). Note that a value other than 0 may be set as long as it can be distinguished from records in which specific reception log information is accumulated.

The IP communication unit 104 performs log accumulation processing, which will be described later (S105).

If the instruction received in S102 is not a reception log accumulation instruction, the IP communication unit 104 determines whether or not the received instruction is a reception log accumulation stop instruction (S106). When the received instruction is an instruction to stop accumulation of reception logs, IP communication section 104 sets the reception log accumulation flag to OFF (S107). Then, IP communication section 104 stops accumulating reception logs in log accumulation table T1 of IP log accumulation section 114 (S108).

If the instruction received in S106 is not an instruction to stop accumulation of reception logs, the IP communication unit 104 determines whether or not the received instruction is a channel selection instruction (S109). When the received instruction is a channel selection instruction, IP communication section 104 determines whether the log accumulation flag is set to ON or OFF (S110).

When the log accumulation flag is set to ON, IP communication section 104 stops transmission of packet reception information to IP log accumulation section 114 so as to stop accumulation of the reception log (S111). The IP communication unit 104 adds an all-zero record to the log accumulation table T1 (S112). The control unit 102 selects the channel indicated by the channel selection instruction (S113). In other words, the receiver 100 divides the reception log of the previously selected channel into an all-zero record, and is ready to accumulate the reception log of the channel to be tuned this time. More specifically, when the receiver 100 selects a channel and leaves from the original multicast, packets do not reach the receiver 100 until the channel is selected. Even in this case, the receiver 100 inserts all zeros at the time of channel switching, thereby suppressing false recognition that a packet loss has occurred.

The IP communication unit 104 performs log accumulation processing, which will be described later (S114). In the log accumulation processing here, the IP communication unit 104 sends the packet reception information (reception log) regarding the reception of the stream of the selected channel to the IP log accumulation unit 114 so as to accumulate the packet reception information. .

When the log accumulation flag is set to OFF in S110, the IP communication unit 104 performs channel selection according to the channel selection instruction.

FIG. 3 is a flowchart illustrating an example of log accumulation processing.

The IP communication unit 104 receives stream IP packets (for example, RTP (Real-time Transport Protocol) packets) (S201). An RTP packet includes an IP header, a UDP header, and an RTP header. RTP packets include, for example, seven TS (TS: Transport Stream) packets, TTS (TTS: Timestamped Transport Stream) packets, and divided TLVs (Type Length Value) obtained by dividing the TLV into the same size as the TS packet at equal intervals. Packets or TLV packets with time stamps are included.

The IP communication unit 104 acquires the time when the IP packet was received in S201 (packet reception time, clocked reception time) from the clock 105 (S202). IP communication unit 104 also acquires the source IP multicast address included in the header of the received IP packet. The IP communication unit 104 extracts a UDP packet from the received IP packet, and acquires the time stamp and sequence number from the header of the RTP packet included in the payload of the UDP packet.

IP communication unit 203 sends the packet reception information to IP log storage unit 114 (S203). The packet reception information may include packet reception time, source IP multicast address, timestamp (RTP timestamp) and sequence number information. Packet reception information may include information other than the above. At least part of the packet reception information becomes a reception log.

IP communication unit 104 determines whether or not an instruction to stop accumulation of reception logs has been received from control unit 102 (S204). If the IP communication unit 104 has not received an accumulation stop instruction, the process proceeds to S201. On the other hand, when the IP communication unit 104 receives the instruction to stop accumulation, it ends the processing of FIG.

According to the operation for accumulating such a reception log, receiver 100 can accumulate packet reception information relating to reception of IP packets included in a stream. Packet reception information can be referred to as a reception log, and can be used for data analysis such as reception quality.

FIG. 4 is a diagram showing an example of information accumulated in the log accumulation table TB1 (TB11).

The log accumulation table TB1 accumulates reception logs (packet reception information). The reception log may include items such as record number (No.), arrival time, IP address, RTP time stamp, and sequence number. The arrival time corresponds to the packet reception time. The IP address corresponds to the source IP multicast address. The IP address may be, for example, an IPv4 IP address or an IPv6 IP address. The RTP timestamp corresponds to the timestamp included in the RTP packet header. The sequence number corresponds to the sequence number included in the RTP packet header.

In FIG. 4, all zeros are inserted at the position of record number 100, and the digits at the end of the IP address change from "23" to "24" before and after record number 100. In FIG. In other words, it indicates that the selected channel changed before and after the record number 100th.

FIG. 4 shows that a 6 Mbps stream regularly receives IP packets at a rate of once every 175466 nanoseconds. In addition, in FIG. 4, no loss or delay such as packet loss or packet arrival fluctuation occurs in the reception of IP packets.

Next, data analysis based on reception logs will be described.

FIG. 5 is a flow chart showing an operation example when the receiver 100 performs data analysis based on the reception log. This data analysis may be at predetermined timings. Data analysis may be performed on a regular basis, for example once every n days, at a fixed time. Further, it may be performed when an instruction for data analysis is received from a remote controller that instructs data analysis by a user operation.

IP data analysis unit 116 acquires data included in the reception log from IP log storage unit 114 (S301). The log data is at least part of the information accumulated in the log accumulation table TB1. IP data analysis unit 116 executes packet loss calculation processing based on the acquired log data (S302). Details of the packet loss calculation process will be described later. The IP data analysis unit 116 calculates packet arrival fluctuations based on the acquired log data (S303). The details of the packet arrival fluctuation arithmetic processing will be described later. The IP data analysis unit 116 stores the calculation result of at least one of the packet loss rate and the packet arrival fluctuation in the result management table TB3, which will be described later (S304).

FIG. 6 is a diagram showing an example of information accumulated in the log accumulation table TB1 (TB12). FIG. 6 illustrates that packet loss has occurred. In FIG. 6, there is an absent sequence number (23429) between the sixth (record number No. 6) sequence number (23428) and the seventh (record number No. 7) sequence number (23430). That is, it indicates that one packet loss has occurred.

FIG. 7 is a flowchart illustrating an example of packet loss calculation processing. Information on the variable i indicating the packet registration number, the comparison sequence number, the number of error packets, and the total number of packets may be held in the memory of the receiver 100 . The packet registration number corresponds to the record number in the log accumulation table TB1.

The IP data analysis unit 116 initializes the values of the variable i, the comparison sequence number, the number of error packets, and the total number of packets, and sets the initial value to 0 (S401). IP data analysis unit 116 determines whether or not there is i-th data (S402). If there is i-th data, acquire i-th data (for example, at least one of "arrival time", "IP address", "RTP time stamp", and "sequence number" in the reception log) (S403) .

IP data analysis unit 116 determines whether the i-th data obtained is all zero (S404). If the i-th data is all zeros, IP data analysis unit 116 clears the comparison sequence number, that is, sets the comparison sequence number to an initial value of 0 (S405). IP data analysis unit 116 then increments variable i and adds value 1 (S411). After S411, the process proceeds to S402.

If the i-th data is not all zero in S404, IP data analysis unit 116 increments the total number of packets and adds 1 (S406). It is determined whether or not there is a comparison sequence number, that is, whether or not the comparison sequence number is equal to or greater than 1 (S407). If the comparison sequence number is less than the value 1, that is, if the comparison sequence number is the initial value 0 (cleared state), the comparison sequence number is set as the sequence number of the i-th data (S408). IP data analysis unit 116 then increments variable i and adds value 1 (S411).

If the comparison sequence number is equal to or greater than 1 in S407, IP data analysis unit 116 determines whether or not the sequence number of the i-th data is equal to the value obtained by adding 1 to the comparison sequence number (S409). . When the sequence number of the i-th data is equal to the value obtained by adding 1 to the comparison sequence number, IP data analysis section 116 increments the comparison sequence number and adds 1 (S410). IP data analysis unit 116 then increments variable i and adds value 1 (S411).

If the sequence number of the i-th data and the value obtained by adding 1 to the comparison sequence number are not equal in S409, the IP data analysis unit 411 adds 1 to the comparison sequence number from the sequence number of the i-th data. Subtract the resulting value to get the subtracted value. That is, subtraction value=sequence number of i-th data−(comparison sequence number+1). IP data analysis unit 411 adds the subtraction value to the number of error packets (S412). Then, IP data analysis unit 116 sets the comparison sequence number as the sequence number of the i-th data (S408). IP data analysis unit 116 then increments variable i and adds value 1 (S411).

If there is no i-th data in S402, that is, if there are no remaining records accumulated in the log accumulation table TB1, the IP data analysis unit 166 calculates the packet loss rate based on the number of error packets and the total number of packets. Calculate (S413). Specifically, the packet loss rate may be calculated according to Equation (1) below.
Packet loss rate (%) = (number of error packets/total number of packets) x 100 (1)

Assume that the reception log data shown in FIG. 6 is held in the log accumulation table TB1. If i=0 corresponding to the record number, the data is all zero, so the process proceeds from S404 to S405. If i=1, the data is not all zero and the comparison sequence number has the value 0, so the process proceeds from S404 to S406 and from S407 to S408. In the case of i=2, 3, 4, 5, 6, the data is not all zero, the comparison sequence number is not 0, and the condition of S409 is satisfied. Proceed to S410. In this case, since the sequence numbers are consecutive numbers, the receiver 100 can determine that no packet loss has occurred. If i=7, the data is not all zero, the comparison sequence number is not 0, and the condition of S409 is not satisfied. In this case, since the sequence numbers are not consecutive numbers, the receiver 100 can determine that packet loss has occurred. Since the eighth record (i=8) does not exist, the process proceeds from S402 to S413. That is, the packet loss rate in this case is (⅛)×100=12.5%.

According to such packet loss calculation processing, the receiver 100 can derive the presence or absence of packet loss and the packet loss rate, which are examples of reception quality, by simple calculation processing. The receiver 100 displays the reception quality in an easy-to-understand manner based on the packet loss rate, so that both viewers and business operators can easily check the quality state.

FIG. 8 is a diagram showing an example of information accumulated in the log accumulation table TB1 (TB13). FIG. 8 illustrates the occurrence of packet arrival fluctuations. Referring to the arrival times in FIG. 8, IP packets other than record number No. 3 arrive at intervals of 1,754,666 nsec. They arrive at intervals of 3,509,332 nsec. Here, it can be understood that although the IP packets are sent out at equal time intervals on the delivery side, the intervals at which the IP packets are received on the receiving side are not constant and fluctuate.

FIG. 9 is a flowchart illustrating an example of packet arrival fluctuation calculation processing. Information on the variable i indicating the packet registration number, the comparative arrival time, and the total number of packets may be held in the memory of the receiver 100 . The packet registration number corresponds to the record number in the log accumulation table TB1.

IP data analysis unit 116 initializes variable i, comparison arrival time, and total number of packets (S501). In this case, the initial value of the variable i and the total number of packets is set to 0, and the initial value is set to the comparative arrival time. IP data analysis unit 116 determines whether or not there is i-th data (S502). If there is i-th data, acquire i-th data (for example, at least one of "arrival time", "IP address", "RTP time stamp", and "sequence number" in log accumulation table TB1) ( S503).

IP data analysis unit 116 determines whether the i-th data obtained is all zero (S504). When the i-th data is all zero, IP data analysis unit 116 initializes the comparative arrival time, that is, sets the initial value 0 to the comparative arrival time (S505). The initial value of the comparison arrival time may be a value other than zero. IP data analysis unit 116 then increments variable i and adds value 1 (S511).

If the i-th data is not all zero in S504, IP data analysis unit 116 increments the total number of packets and adds 1 (S506). IP data analysis unit 116 determines whether there is a comparative arrival time, that is, whether it is other than the initial value (S507). If the comparative arrival time is the initial value, the comparative arrival time is set as the arrival time of the i-th data (S508). IP data analysis unit 116 then increments variable i and adds value 1 (S511).

If the comparative arrival time is other than the initial value in S507, the IP data analysis unit 116 calculates the difference between the arrival time of the i-th data and the comparative arrival time as the arrival time interval (S509). The IP data analysis unit 116 holds the information of the calculated difference (arrival time interval) in the arrival interval table TB2 (see FIG. 10, for example) (S510). IP data analysis unit 116 then increments variable i and adds value 1 (S511).

FIG. 10 is a diagram showing an example of the arrival interval table TB2. The arrival interval table TB2 holds items such as a registration number assigned in order of registration and an arrival time interval, and may hold other information. In the case of FIG. 10, the second (registration number No. 2) arrival time interval is the maximum arrival time interval, and its value is 3,509,332. The minimum arrival time intervals of arrival time intervals other than the second (registration number Nos. 1, 3, 4, 5, and 6) are 1,754,666. In other words, it can be understood that the arrival time interval varies depending on the received IP packets.

If there is no i-th data in S502, that is, if there are no remaining records accumulated in the log accumulation table TB1, the IP data analysis unit 166 calculates the value (fluctuation amount) of packet arrival fluctuation (jitter). (S512). Packet arrival fluctuations may be calculated according to known methods.

When IP data analysis unit 166 complies with RFC (Request for Comments) 3550, IP data analysis unit 166 analyzes RTP time stamp Si of IP packets received in communication between a transmitting device (here, distribution server 200) and a receiving device (here, receiver 100). and the arrival time Ri, the packet arrival fluctuation (jitter) may be calculated.

In RFC3500, the jitter J(i) may be calculated by Equation (2). FIG. 11 is a diagram for explaining an example of jitter calculation.
J(i)=J(i-1)+(|D(i-1,i)|-J(i-1))/16 (2)
Note that D(i, j)=(Rj-Ri)-(Sj-Si).

The IP data analysis unit 166 uses ITU-T Rec. When following Y1541, the packet arrival fluctuation (jitter) may be calculated based on the arrival time without using the RTP timestamp of the received IP packet. For example, the packet arrival fluctuation may be calculated as the difference between the maximum arrival time interval and the minimum arrival time interval.

Therefore, ITU-T Rec. In accordance with Y1541, when the information held in the arrival interval table TB2 shown in FIG. 10 is obtained, packet arrival fluctuations are as follows.
Packet arrival fluctuation = maximum arrival time interval - minimum arrival time interval
= 3,509,332 - 1,754,666
= 1,754,666 (nsec)
≈1.7 (msec)

Assume that the reception log data shown in FIG. 9 is held in the log accumulation table TB1. If i=0 corresponding to the record number, the data is all zero, so the process proceeds from S504 to S505. If i=1, the data is not all zero and the comparison arrival time is the initial value, so the process proceeds from S504 to S506 and from S507 to S508. If i=2, 3, 4, 5, 6, 7, the data is not all zero and the comparison arrival time is not the initial value, so the process proceeds from S504 to S506 and from S507 to S508. Since the eighth record (i=8) does not exist, the process advances from S502 to S512 to calculate packet arrival fluctuations. Packet arrival fluctuations in this case are described in ITU-T Rec. In accordance with Y1541, it is approximately 1.7 (msec) as described above.

Note that ITU-T Rec. When following Y1541, RTP time stamp information is not used in calculating packet arrival fluctuations. In this case, no RTP timestamp is required.

According to such packet arrival fluctuation arithmetic processing, receiver 100 can derive a value indicating packet arrival fluctuation, which is an example of reception quality, by simple arithmetic processing. The receiver 100 displays the reception quality in an easy-to-understand manner based on the value indicating the packet arrival fluctuation, so that both the viewer and the operator can easily check the quality state.

FIG. 12 is a diagram showing an example of information accumulated in the result management table TB3.

The result management table TB3 includes items such as analysis date and time, log start date and time, log end date and time, total number of packets, packet loss rate, and packet arrival fluctuation. The analysis date and time may be the date and time when the operation in FIG. 5 was executed. The log start date and time may be the first registration date and time of the data to be analyzed registered in the log accumulation table TB1. The log end date and time may be the registration date and time of the last data among the dates and times when the data to be analyzed were registered in the log accumulation table TB1. The total number of packets may be the total number of packets used in the packet loss calculation process of FIG. 7 and the packet arrival fluctuation calculation process of FIG. The packet loss rate may be the packet loss rate obtained as a result of the packet loss calculation process in FIG. The packet arrival fluctuation may be the packet arrival fluctuation obtained as a result of the packet arrival fluctuation arithmetic processing in FIG. An index indicating reception quality other than packet loss and packet arrival fluctuation may be derived and registered in the result management table TB3.

Next, display by the display unit 118 will be described.

The display unit 118 displays information based on the packet loss rate obtained as a result of packet loss calculation processing. The display unit 118 displays information based on packet arrival fluctuations obtained as a result of packet arrival fluctuation calculation processing. If the values of the packet loss rate and the packet arrival fluctuation are displayed as they are, it is difficult for the user to understand them. For example, when the packet arrival fluctuation is 1.7 msec, the packet loss is 0.000001, etc., it is difficult for the user to understand whether there are many losses or whether the packet arrival fluctuation is large. Note that the calculation and control for displaying may be performed by the control unit 102 .

In this embodiment, reception quality information is displayed so that the user can easily understand the IP packet reception quality (network quality). Reception quality may include packet loss rate, packet arrival fluctuation, packet shuffling, packet arrival delay, and the like. Packet switching means that the order in which the IP packets received by the IP communication unit 104 are switched. The packet arrival delay is that the reception time of the IP packet by the IP communication unit 104 is delayed from the reception scheduled time assumed from the transmission time.

The control unit 102 may set one or more thresholds th (th1, th2, . . . ) to evaluate the packet loss rate and packet arrival fluctuation. The display unit 118 may display this evaluation result. Evaluation results may include, by way of example, best, good, bad, and other evaluations. The evaluation result may be displayed, for example, as character information or graphic information, and may be indicated by the color of the LED lighting or blinking. The graphic information may include illustration information of faces, and may be represented by a smiling face for best, a normal face for good, a crying face for bad, and the like.

For example, the threshold th1 may be 10 ⁻⁴ and the threshold th2 may be 10 ⁻³ . Control section 102 may evaluate that the reception quality is the best when 0≦packet loss rate<th1 is satisfied. Control section 102 may evaluate that the reception quality is good when th1≦packet loss rate<th2 is satisfied. Control section 102 may evaluate that the reception quality is poor when th2≦packet loss rate is satisfied.

For example, the threshold th3 may be 100 msec, and the threshold th4 may be 200 msec. Control section 102 may evaluate that the reception quality is the best when 0≦packet arrival fluctuation<th3 is satisfied. If th3≦packet arrival fluctuation<th4, control section 102 may evaluate that the reception quality is good. Control section 102 may evaluate that the reception quality is poor when th4≦packet loss rate is satisfied.

As a result, even if the packet loss rate becomes "0.00000001" or the like, and it is difficult for general users to perceive the reception quality, the reception quality can be easily understood.

In addition, the control unit 102 controls the character strings (numbers, letters, decimal points, units, the number of consecutive identical numbers, etc.) included in the specific packet loss rate and packet arrival fluctuation values. You may replace the string with other corresponding strings. A string may be a single number, letter, decimal point, unit, and the like. For example, "0" may be replaced with "A", "1" with "B", "2" with "C", and so on. The decimal point '.' may be replaced with 'X'. A consecutive number of the same number may be replaced with a number indicating this consecutive number. In this case, it can be replaced as follows.
"0.0000001" → "AX6AB"
"200" → "C2A"

As a result, even when the packet loss rate is "0.00000001" or the like, and the number of digits is large or the number of consecutive 0's is large, the receiver 100 can prevent the user from erroneously recognizing the number of 0's. Note that the control unit 102 may replace part of the information included in the packet arrival fluctuation value with another character string in the same manner as the packet loss rate.

FIG. 13 is a diagram showing a display example of the reception quality on the display unit 118. As shown in FIG. The reception quality may include packet loss information regarding packet loss (eg, packet loss rate) and packet arrival fluctuation information regarding packet arrival fluctuation (eg, packet arrival fluctuation rate). In FIG. 13 , the display unit 118 displays evaluation information (best, poor, etc.) on packet loss information and packet arrival fluctuation information, and information replaced with other character strings indicating the packet loss rate and packet arrival fluctuation rate (AX6AB , C2A, etc.) are displayed. Although FIG. 13 illustrates that both the evaluation information and the information replaced with the other character string are displayed at the same time, either one of them may be displayed.

In this way, in the IP broadcasting system 5, the receiver 100 indicates the reception quality of the IP broadcast not by the reception strength but by the probability that the IP packets of the stream are lost or the frequency of delay. Derive information. Therefore, when compared with the reception quality (reception strength) of streams via broadcast waves, it is indicated by another index. In the case of the FTTH network, the signal strength of the electrical signal can be measured, and the reception facility 150 (ONU) in front of the receiver 100 can measure it, but the optical strength of the optical signal received from the reception facility 150 is detected. However, it is difficult to accurately grasp how much data is missing. On the other hand, the receiver 100 of the present embodiment derives the reception quality such as packet loss based on the reception status of IP packets, so that the reception quality determination accuracy can be improved. In addition, the receiver 100 determines the degree of influence caused by packet arrival fluctuations (for example, image output based on IP packets does not catch up with a predetermined time, and image output stops or block noise occurs). , can be presented to the user in an easy-to-understand manner.

Also, since packet loss is rare, the packet loss rate tends to be a very small value (eg, 0.0000001). When this number is displayed, it is difficult for ordinary users to judge whether this packet loss rate is large or small. On the other hand, the receiver 100 presents the reception quality in a format that is easy for general users to understand (for example, reception quality evaluation information based on the threshold value th, information replaced with other character strings) to viewers and business operators. It can be visualized.

Note that IP communication section 104 may transmit the reception log accumulated in IP log accumulation section 114 and the analysis result analyzed by IP data analysis section 116 to an external server. For example, the IP communication unit 104 as the IP log notification unit may transmit the reception log shown in FIG. 4 or the data of the result management table TB3 shown in FIG. 12 to the log collection server as an external server. The transmission timing may be, for example, a fixed time once a day, or may be the timing when the IP data analysis unit 116 generates the result management table TB3. As a transmission method, for example, it may be transmitted by putting it on an HTTP POST message.

The IP communication unit 104 may transmit at least part of the information contained in the reception log to the external server without analyzing the reception log. In this case, the external server may derive (for example, calculate) the reception quality based on the reception log and display it. IP communication unit 104 may also send a value indicating reception quality (for example, a value indicating packet loss rate or packet arrival fluctuation) to the external server. In this case, the server may generate information indicating the reception quality (for example, evaluation result information, information replaced with other character strings) based on the value indicating the reception quality, and may display the information. IP communication section 104 may also send information indicating reception quality to an external server. In this case, the server may display information indicating the reception quality. In this way, the receiver 100 and the external server may cooperate to perform processing related to the output of the reception log and reception quality. The external server may be included in IP broadcast system 5 . Also, a plurality of transmitters 50 may exist. A plurality of receivers 100 may exist.

Various embodiments have been described above with reference to the drawings, but it goes without saying that the present disclosure is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope described in the claims, and these also belong to the technical scope of the present disclosure. Understood.

In the above embodiment, the reception quality is evaluated using a threshold value as a display example, and the information indicating the reception quality is displayed by replacing the decimal point, the consecutive number of the same numbers, etc. with other corresponding character strings. Although displaying is exemplified, the information indicating the reception quality may be displayed by other methods. For example, the control unit 102 may define a quantification rule for reception quality and display it as a bar graph. For example, the reception quality may be adjusted (for example, linearly adjusted) so that the lowest possible reception quality is a value of 0 and the highest reception quality is a value of 100, and displayed in a bar graph or the like.

In the above embodiment, processing related to data broadcasting may be omitted. In other words, the processing related to the data broadcasting data and the data broadcasting stream by the distribution server 200 and the processing related to the data broadcasting data and the data broadcasting stream by the receiver 100 may be omitted.

In the above embodiment, each component of the IP broadcasting system 5 shown in FIG. 1 and the like may be configured with dedicated hardware, or the function of each component may be realized by software using general-purpose hardware. good too. Special purpose hardware and general purpose hardware may include various processors.

In the above embodiments, the processor may be physically configured in any way. Moreover, if a programmable processor is used, the content of processing can be changed by changing the program, so that the degree of freedom in designing the processor can be increased. The processor may be composed of one semiconductor chip, or physically composed of a plurality of semiconductor chips. When configured with a plurality of semiconductor chips, each control of the first embodiment may be realized by separate semiconductor chips. In this case, it can be considered that the plurality of semiconductor chips constitutes one processor. Also, the processor may be composed of a member (capacitor, etc.) having a function different from that of the semiconductor chip. Also, one semiconductor chip may be configured to implement the functions of the processor and other functions.

As described above, the IP broadcast receiving apparatus (for example, the receiver 100) of this embodiment receives a stream (for example, a program content stream) using IP packets. The receiving device includes a receiving unit (for example, IP communication unit 104), an acquisition unit (for example, IP data analysis unit 116), a calculation unit (for example, IP data analysis unit 116), a generation unit (for example, control unit 102), and a display unit (for example, A display unit 118) may be provided. The receiver may receive the stream via the network. The obtaining unit may obtain packet reception information regarding reception of a plurality of IP packets in the stream. The calculator may calculate a value indicating the reception quality of the stream based on the packet reception information. The generator may process the value indicating the reception quality to generate information indicating the reception quality. The display unit may display information indicating reception quality.

As a result, the IP broadcast receiver can derive a reception quality value that more accurately expresses the network quality through which IP packets are transmitted, based on the packet reception information. In addition, the IP broadcast receiver can present the reception quality in a user-friendly format by processing and displaying the reception quality value instead of displaying the reception quality value as it is. Therefore, the IP broadcast receiving apparatus can visualize the quality of received data in IP broadcast, and can easily confirm the quality state for both viewers and business operators.

Also, the generating unit may generate information indicating the reception quality by replacing a character string included in the value indicating the reception quality with another character string corresponding to the character string.

As a result, the IP broadcast receiver can present the reception quality in a format that makes it difficult for the user to erroneously recognize the reception quality, even if the reception quality is derived as a value with a large number of digits.

Also, the generator may compare the value indicating the reception quality with the threshold value th, and generate information indicating the reception quality according to the comparison result.

As a result, the IP broadcast receiver can evaluate the reception quality based on the threshold th and present the evaluation in an easy-to-recognize format. Therefore, even users such as viewers who are unfamiliar with the quality of IP packets can easily understand the reception quality.

Further, the obtaining unit may obtain the measured reception time, which is the time when the plurality of IP packets in the stream is received by the receiving unit. Reception quality may include packet arrival fluctuations that indicate variations in the times at which multiple consecutive IP packets are received by the receiver. The calculator may calculate a value indicating packet arrival fluctuation based on the clocked reception time.

As a result, the IP broadcast receiving apparatus can present packet fluctuation information to both viewers and business operators in a manner that is easy to confirm.

Also, the acquisition unit may acquire multiple time stamps (for example, RTP time stamps) included in multiple IP packets in the stream. The calculation unit may calculate the packet arrival fluctuation based on the plurality of acquired time stamps.

With this, the IP broadcast receiver can comply with, for example, ITU-T Rec. Even when packet arrival fluctuations are derived in accordance with Y1541, information on packet fluctuations can be presented to viewers and business operators in an easy-to-confirm manner.

Also, the obtaining unit may obtain the reception order (for example, the sequence number) of the plurality of IP packets in the stream. Reception quality may include packet loss, which indicates loss of IP packets. The calculation unit may calculate packet loss information (for example, a packet loss rate or other value indicating packet loss) related to packet loss based on the obtained reception order of the plurality of IP packets.

As a result, the IP broadcast receiver confirms the continuity of the reception order of the received IP packets, for example, so that the information on the packet loss can be presented to both the viewer and the operator in an easy-to-confirm manner.

The IP broadcast receiver may also include an accumulation unit (for example, IP log accumulation unit 114) that accumulates packet reception information. The receiving unit may cause the storage unit to store the packet reception information during at least part of the period during which the power of the IP broadcast receiving apparatus is turned on. The acquisition unit may acquire the packet reception information from the storage unit.

As a result, the IP broadcast receiver can present the reception quality based on the packet reception information accumulated in the past. Also, when the IP broadcast receiving apparatus accumulates packet reception information over a long period of time, for example, it is possible to derive a value indicating reception quality even if the index of reception quality occurs infrequently.

Further, the receiving unit may cause the storage unit to store the packet reception information during a period in which the power of the IP broadcast receiving apparatus is on and the stream is not being reproduced or recorded.

As a result, the IP broadcast receiver can derive a value indicating the reception quality during a period when the viewer does not view or record the IP broadcast. Therefore, it is possible to prevent the processing load from concentrating in the IP broadcast receiving apparatus in a predetermined period.

Further, the receiving unit may store the packet reception information in the storage unit while the power of the IP broadcast receiving apparatus is on and the stream is being reproduced or recorded.

As a result, the IP broadcast receiving apparatus can derive a value indicating the reception quality while the viewer watches or records the IP broadcast. As a result, the IP broadcast receiver can accumulate packet reception information and view and record IP broadcasts at the same time, and perform other processes during periods other than viewing and recording IP broadcasts to improve operational efficiency. , the power consumption of the IP broadcast receiver can be reduced.

The IP broadcast receiver may also include a transmitter (for example, IP communication section 104) that transmits packet reception information to the server. Also, the transmitting unit may transmit a value indicating the reception quality of the stream based on the packet reception information. Also, the transmitting unit may transmit information indicating the reception quality obtained by processing the value indicating the reception quality.

As a result, the IP broadcast receiver visualizes the quality of the received data in the IP broadcast in cooperation with the server, making it easy for both viewers and business operators to check the quality state. In other words, the IP broadcast receiver or server can derive a reception quality value that more accurately expresses the network quality through which IP packets are transmitted. Also, the IP broadcast receiver or server can derive information indicating the reception quality by processing the value of the reception quality. Therefore, the server can present the reception quality in a user-friendly format. Therefore, the IP broadcast receiver and the server can visualize the quality of received data in IP broadcast, and the viewers and business operators can easily check the quality state.

Also, the server that receives various information from the IP broadcast receiver can analyze the IP data. Also, the server can later change the thresholds for evaluating packet loss rate and packet arrival fluctuation for evaluating best, good, bad, etc. (for example, after receiving information from the IP broadcast receiver). Also, the server can change the formula for calculating packet arrival fluctuations. Also, the server operator who operates the server can centrally manage the reception quality of all the receivers 100 in the IP broadcasting system 5 .

INDUSTRIAL APPLICABILITY The present disclosure is useful for an IP broadcast receiving apparatus, an IP broadcast receiving method, and the like, which visualizes the quality of received data in IP broadcasting and makes it easy for viewers and business operators to check the quality state.

5 IP broadcasting system 100 receiver 102 control unit 104 IP communication unit 105 clock 106 demultiplexer 108 video decoder 110 audio decoder 112 data processing unit 114 IP log accumulation unit 116 IP data analysis unit 118 display unit 150 reception equipment 160 router 200 distribution server 300 Router 400 Transmission facility TN Home

Claims (10)

An IP broadcast receiver that receives a stream using IP (Internet Protocol) packets,
a receiver that receives the stream via a network;
an acquisition unit for acquiring packet reception information regarding reception of a plurality of IP packets in the stream;
a calculation unit that calculates a value indicating the reception quality of the stream based on the packet reception information;
a generation unit that processes the value indicating the reception quality to generate information indicating the reception quality;
a display unit for displaying information indicating the reception quality;
an accumulation unit for accumulating the packet reception information,
The receiving unit accumulates the packet reception information in the storage unit during a period in which the power of the IP broadcast receiving device is on and the stream is being reproduced or recorded, and the stream is reproduced or recorded. an IP broadcast receiver that does not store the packet reception information in the storage unit during a period in which the packet reception information is not received. An IP broadcast receiver that receives a stream using IP (Internet Protocol) packets,
a receiver that receives the stream via a network;
an acquisition unit for acquiring packet reception information regarding reception of a plurality of IP packets in the stream;
a calculation unit that calculates a value indicating the reception quality of the stream based on the packet reception information;
a generation unit that processes the value indicating the reception quality to generate information indicating the reception quality;
a display unit for displaying information indicating the reception quality;
an accumulation unit for accumulating the packet reception information,
The receiving unit accumulates the packet reception information in the storage unit during a period in which the power of the IP broadcast receiving device is on and the stream is not being reproduced or recorded, and the stream is reproduced or recorded. IP broadcast receiving apparatus, which does not store the packet reception information in the storage unit during the period in which the packet reception information is stored. The generating unit compares a value indicating the reception quality with a threshold, and generates information indicating the reception quality according to the comparison result.
3. The IP broadcast receiver according to claim 1 or 2. the acquisition unit acquires the packet reception information from the storage unit;
An IP broadcast receiver according to any one of claims 1 to 3. The accumulation unit accumulates an all-zero record when switching to a channel.
An IP broadcast receiver according to any one of claims 1 to 3. An IP broadcast receiver that receives a stream using IP packets,
a receiver that receives the stream via a network;
an acquisition unit for acquiring packet reception information regarding reception of a plurality of IP packets in the stream;
a calculation unit that calculates a value indicating the reception quality of the stream based on the packet reception information;
a transmission unit that transmits a value indicating reception quality of the stream;
an accumulation unit for accumulating the packet reception information,
The receiving unit accumulates the packet reception information in the storage unit during a period in which the power of the IP broadcast receiving device is on and the stream is being reproduced or recorded, and the stream is reproduced or recorded. the packet reception information is not stored in the storage unit during a period in which the packet reception information is not stored;
IP broadcast receiver. An IP broadcast receiver that receives a stream using IP packets,
a receiver that receives the stream via a network;
an acquisition unit for acquiring packet reception information regarding reception of a plurality of IP packets in the stream;
a calculation unit that calculates a value indicating the reception quality of the stream based on the packet reception information;
a transmission unit that transmits a value indicating reception quality of the stream;
an accumulation unit for accumulating the packet reception information,
The receiving unit accumulates the packet reception information in the storage unit during a period in which the power of the IP broadcast receiving device is on and the stream is not being reproduced or recorded, and the stream is reproduced or recorded. the packet reception information is not accumulated in the accumulation unit during the period of
IP broadcast receiver. Further comprising a generating unit that processes the value indicating the reception quality to generate information indicating the reception quality,
The IP broadcast receiver according to claim 6 or 7. An IP broadcast reception method for an IP broadcast receiver that receives a stream using IP packets, comprising:
receiving said stream over a network;
obtaining packet reception information regarding reception of a plurality of IP packets in the stream;
calculating a value indicating the reception quality of the stream based on the packet reception information;
processing the value indicating the reception quality to generate information indicating the reception quality;
displaying information indicating the reception quality;
The packet reception information is stored while the IP broadcast receiver is powered on and the stream is being reproduced or recorded, and the packet reception information is accumulated while the stream is not being reproduced or recorded. does not accumulate
An IP broadcast receiving method comprising: An IP broadcast reception method for an IP broadcast receiver that receives a stream using IP packets, comprising:
receiving said stream over a network;
obtaining packet reception information regarding reception of a plurality of IP packets in the stream;
calculating a value indicating the reception quality of the stream based on the packet reception information;
processing the value indicating the reception quality to generate information indicating the reception quality;
displaying information indicating the reception quality;
The packet reception information is not accumulated while the IP broadcast receiver is on and the stream is being reproduced or recorded, and the packet is received while the stream is not being reproduced or recorded. accumulate information,
An IP broadcast receiving method comprising:

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