JP2013255093A - Control device, control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a service changeover time in a one-segment broadcast from when a service is specified by a channel operation to when the content of the service is output.SOLUTION: In a high-speed mode, a default PMT which is a PMT for a predetermined PID is acquired, and preparation is made for output of a content where the PID is written in the default PMT. In parallel with this operation, an NIT is acquired, and, on the basis of a service list written in the NIT, service authentication for confirming that the default PMT is a PMT for a specified service specified by the user is performed. If the default PMT is a PMT for the specified service, output of a content where the PID is written in the default PMT is begun. This technology can be applied to, for example, a one-segment broadcast receiving system.

Description

  The present technology relates to a control device, a control method, and a program. In particular, for example, in one-segment broadcasting, the service switching time from when a user specifies a service until content of the service is output is shortened. The present invention relates to a control device, a control method, and a program that can perform the above-described process.

  In Japan's terrestrial digital broadcasting, the UHF (Ultra High Frequency) frequency band of approximately 6 MHz is divided into 13 segments, and one-segment broadcasting using one segment (hereinafter also referred to as one-segment broadcasting) is intended for mobile terminals. It is done as a broadcast.

  As for one-segment broadcasting, a method has been proposed in which a receivable one-segment broadcast is quickly presented to the user among the one-segment broadcasting that can be performed in any segment of any frequency band (for example, Patent Document 1). ).

JP 2011-211627

  In a receiving system that receives one-segment broadcasting, SI / PSI (Service Information / Program Specific Information) is acquired, and based on the SI / PSI, the ES (Elementary Stream) PID (Packet of content such as required images and audio) Identifier) is specified. In the receiving system, the content is acquired and decoded, and after the decoding, the content (image and sound) can be output (presented to the user).

  Therefore, in a receiving system that receives one-segment broadcasting, it is the time from when a user performs a channel operation for selecting a channel (service) until the content of the channel (service) specified by the user is output by the channel operation. The service switching time is a time obtained by adding at least the time for acquiring SI / PSI and the time required for decoding content, and is longer than that for analog broadcasting.

  Here, in one-segment broadcasting (terrestrial digital broadcasting), it may take about 1 second in the worst case to acquire the necessary SI / PSI, and it is necessary to acquire the necessary SI / PSI. The ratio of time to service switching time is large.

  The present technology has been made in view of such a situation, and makes it possible to shorten service switching time in one-segment broadcasting.

  A control device or program according to an aspect of the present technology includes a reception control unit that controls reception of one-segment broadcasting, and the reception control unit is a PMT (Program Map Table) of a predetermined PID (Packet Identifier). The default PMT is acquired, and in parallel with preparing the output of the content in which the PID is described in the default PMT, the NIT of the one-segment broadcasting is acquired, and the service list described in the NIT Based on the above, a service confirmation is performed to confirm that the default PMT is a PMT of a service specified by a user. When the default PMT is a PMT of a service specified by the user, a PID is described in the default PMT. It is a program for causing a computer to function as a control device or a control device that starts output of the content being recorded.

  In the control method according to one aspect of the present technology, the reception control unit of the control device including the reception control unit that controls reception of the one-segment broadcast is a PMT (Program Map Table) of a predetermined PID (Packet IDentifier). In parallel with acquiring the default PMT, and preparing the output of the content in which the PID is described in the default PMT, the NIT of the one-segment broadcasting is acquired, and based on the service list described in the NIT And confirming that the default PMT is the PMT of the service specified by the user. If the default PMT is the PMT of the service specified by the user, a PID is described in the default PMT. This is a control method including a step of starting output of the content.

  In one aspect of the present technology, in reception control for controlling reception of one-segment broadcasting, a default PMT that is a PMT (Program Map Table) of a predetermined PID (Packet IDentifier) is acquired, and the PID is stored in the default PMT. In parallel with preparing the output of the described content, the NIT of the one-segment broadcasting is acquired, and based on the service list described in the NIT, the default PMT indicates the service specified by the user. A service check is performed to confirm that the PMT. When the default PMT is a PMT of a service designated by the user, output of content in which a PID is described in the default PMT is started.

  The control device may be an independent device or may be an internal block constituting one device.

  The program can be provided by being transmitted via a transmission medium or by being recorded on a recording medium.

  According to one aspect of the present technology, in one-segment broadcasting, it is possible to shorten a service switching time from when a user designates a service until content of the service is output.

It is a block diagram which shows the structural example of the hardware of one Embodiment of the receiving system to which the control apparatus of this technique is applied. It is a block diagram which shows the structural example (functional structural example) of the reception control apparatus which controls reception of the 1 seg broadcasting functionally implement | achieved when CPU15 runs a program. It is a figure which shows the example of NIT and PMT as SI / PSI of TS of 1seg broadcasting. It is a figure explaining the relationship between the channel operation by a user and the service which the reception control part 33 receives by channel operation. It is a timing chart explaining the output control processing of each of normal mode and high-speed mode. It is a flowchart explaining the output control process of a normal mode. It is a flowchart explaining the output control process of a high-speed mode.

  [Configuration example of an embodiment of a receiving system to which the present technology is applied]

  FIG. 1 is a block diagram illustrating a hardware configuration example of an embodiment of a reception system to which a control device of the present technology is applied.

  In FIG. 1, the receiving system includes an antenna 11, a one-segment tuner (front end) 12, a nonvolatile memory 13, a DRAM (Dynamic random access memory) 14, a CPU (Central Processing Unit) 15, a user I / F (Interface) 16, a display. A device 17, a DAC / AMP (Digital Analog Converter / Amplifier) 18, and a speaker 19 are included.

  The antenna 11 receives a broadcast wave of one-segment broadcasting (terrestrial digital broadcasting) and supplies a reception signal of the broadcast wave to the one-segment tuner 12.

  The one-segment tuner 12 demodulates the received signal from the antenna 11 under the control of the CPU 15 and supplies a baseband TS (Transport Stream) to the CPU 15.

  The nonvolatile memory 13 stores a program executed by the CPU 15 and data that needs to be retained even after the power of the receiving system is turned off.

  The DRAM 14 is a so-called work memory, and temporarily stores data necessary for the operation of the CPU 15.

  The CPU 15 executes a program stored in the nonvolatile memory 13 to control each block of the reception system and functions as a reception control device that performs reception control for controlling reception of one-segment broadcasting.

  That is, for example, the CPU 15 receives a command for designating a channel, a command for designating channel up or down, and the like from the user I / F 16.

  Further, the CPU 15 determines a frequency band to be received (demodulated) by the one-segment tuner 12 based on a command from the user I / F 16 and controls the one-segment tuner 12 according to the determination.

  Further, the CPU 15 encodes the demultiplexer (DEMUX) that separates necessary data (the TS packet in which the data is arranged) from the TS supplied from the one-segment tuner 12 or the data separated by the demultiplexer. It functions as a decoder (DECODER) that decodes the encoded data.

  The CPU 15 supplies the video data of the content obtained by decoding the encoded data to the display device 17.

  Further, the CPU 15 supplies audio data of the content obtained by decoding the encoded data to the DAC / AMP 18.

  In addition, the CPU 15 displays the channel information such as the channel number and broadcasting station name of the channel broadcasting the program as the received content, and the program information such as the title of the program as the received content as a display device. 17 can be supplied.

  The user I / F 16 is a physical button provided on the housing of the receiving system, a virtual button displayed as a GUI (Graphical User Interface) on the remote commander, the display unit 17 or the like, and is operated by the user. Is done. The user I / F 16 supplies an operation signal such as a command corresponding to a user operation to the CPU 15.

  Here, the operation of the user I / F 16 by the user includes a channel operation (channel operation). The channel operation includes an operation of directly specifying a channel (number) and an operation of raising or lowering the channel from the current channel.

  The display device 17 includes, for example, an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence) display, and the like, and displays an image corresponding to video data supplied from the CPU 15. Further, the display device 18 displays channel information and program information supplied from the CPU 15 as necessary.

  The DAC / AMP 18 performs D / A (Digital / Analog) conversion on the (digital) audio data from the CPU 15, adjusts the level of the resulting (analog) acoustic (sound) signal, and supplies it to the speaker 19. To do.

  The speaker 19 outputs sound (sound) corresponding to the acoustic signal from the DAC / AMP 18.

  In the reception system configured as described above, the CPU 15 functions as a reception control device that controls reception of one-segment broadcasting by executing a program stored in the nonvolatile memory 13.

  [Configuration example of reception control device]

  FIG. 2 is a block diagram illustrating a configuration example (functional configuration example) of a reception control apparatus that controls reception of one-segment broadcasting, which is functionally realized by the CPU 15 of FIG. 1 executing a program.

  In FIG. 2, the reception control apparatus includes a user input processing unit 31, a tuner control unit 32, a reception control unit 33, a database 34, a display processing unit 35, an OSD (On Screen Display) plane 36, a DEMUX unit 37, a video decoder 38, A video buffer 39, a synthesis processing unit 40, an audio decoder 41, and an audio buffer 42 are included.

  The user input processing unit 31 accepts an operation (corresponding command) of the user I / F 16 such as a channel operation by the user and supplies it to the reception control unit 33.

  The tuner control unit 32 controls the one-segment tuner 12 according to the control of the reception control unit 33.

  The reception control unit 33 is based on the operation of the user I / F 16 by the user from the user input processing unit 31, the data stored in the database 34, the SI / PSI from the DEMUX unit 37, and the like. The DEMUX unit 37 and other necessary blocks are controlled.

  The database 34 stores data necessary for processing of the reception control unit 33 such as a channel (service) received by the one-segment tuner 12 when the power is finally turned off according to the control of the reception control unit 33. . In addition, the database 34 stores information on channels preset in a factory or the like.

  The display processing unit 35 receives channel information and program information supplied from the reception control unit 33 as necessary, and draws them on the OSD plane 36.

  The OSD plane 36 is a storage area in which an image as an OSD is drawn. Channel information and program information (images thereof) are drawn by the display processing unit 35.

  The DEMUX unit 37 is supplied with TS from the one-segment tuner 12.

  The DEMUX unit 37 separates SI / PSI from the TS from the one-segment tuner 12 and supplies it to the reception control unit 33.

  Further, the DEMUX unit 37 separates the TS packet of the PID supplied from the reception control unit 33 from the TS from the one-segment tuner 12 and converts the encoded data of the video data arranged in the TS packet to the video decoder 38. To supply.

  Further, the DEMUX unit 37 supplies the audio data 41 with the encoded data of the audio data arranged in the TS packet separated from the TS from the one-segment tuner 12.

  The video decoder 38 decodes the encoded data of the video data from the DEMUX unit 37 and supplies the video data obtained as a result to the video buffer 39.

  The video buffer 39 stores the video data from the video decoder 38 as appropriate.

  The synthesis processing unit 40 superimposes channel information and program information drawn on the OSD plane 36 on the video data stored in the video buffer 39 by so-called α blending or the like, and obtains video data obtained as a result of the α blending. This is supplied to the display device 17.

  The audio decoder 41 decodes the encoded data of the audio data from the DEMUX unit 37 and supplies the audio data obtained as a result to the audio buffer 42.

  The audio buffer 42 stores the audio data from the audio decoder 41 as appropriate. The audio data stored in the audio buffer 42 is appropriately read and supplied to the DAC / AMP 18.

  In the reception control apparatus configured as described above, for example, when the user performs a channel operation of the user I / F 16, the user input processing unit 31 receives the channel operation of the user I / F 16, and receives the channel control of the reception control unit 33. To supply.

  The reception control unit 33 performs channel selection processing of a channel desired by the user based on the channel operation from the user input processing unit 31. That is, the reception control unit 33 determines a frequency band to be received, and controls the tuner control unit 32 so as to receive a signal in the frequency band.

  The tuner control unit 32 controls the one-segment tuner 12 according to the control of the reception control unit 33 to receive a signal in the frequency band of the channel desired by the user.

  As a result, the one-segment tuner 12 receives the signal of the frequency band of the channel (service) desired by the user, and the TS of the channel is supplied to the DEMUX unit 37.

  The DEMUX unit 37 separates SI / PSI such as NIT (Network Inforamtion Table and PMT (Program Map Table)) from the TS from the one-segment tuner 12 and supplies the SI / PSI to the reception control unit 33 under the control of the reception control unit 33.

  The reception control unit 33 acquires the SI / PSI from the DEMUX unit 37 by instructing the DEMUX unit 37 of the SI / PSI PID. Then, the reception control unit 33 recognizes the PID of the TS packet in which the content data (video data or audio data) to be decoded is arranged from the SI / PSI, and separates the TS packet of the PID from the TS. Next, the DEMUX unit 37 is controlled.

  The DEMUX unit 37 separates the TS packet in which the content data to be decoded is arranged from the TS from the one-segment tuner 12 under the control of the reception control unit 33. Then, the DEMUX unit 37 supplies the video data 38 with the encoded data of the video data out of the data arranged in the TS packet separated from the TS, and supplies the audio data with the encoded data of the audio data. To do.

  In the video decoder 38, the encoded data of the video data from the DEMUX unit 37 is decoded. Video data obtained as a result of decoding by the video decoder 38 is supplied to the video buffer 39 and stored therein.

  Channel information and program information drawn on the OSD plane 36 are superimposed on the video data stored in the video buffer 39 as necessary in the composition processing unit 40. Then, the video data is supplied from the composition processing unit 40 to the display device 17 and a corresponding image is displayed.

  On the other hand, the audio decoder 41 decodes the encoded data of the audio data from the DEMUX unit 37. Audio data obtained as a result of decoding by the audio decoder 41 is supplied to the speaker 19 via the audio buffer 42 and the DAC / AMP 18 and corresponding sound is output.

  The reception control unit 33 refers to channel information preset in the database 34 (for example, the frequency of each channel) and determines a frequency band to be received.

  Further, when the power of the receiving system is turned off, the reception control unit 33 causes the database 34 to store information on the channel (service) received immediately before the power is turned off. Immediately after the power of the receiving system is turned on, the reception control unit 33 performs channel selection processing of the channel (service) received when the power is last turned off, which is stored in the database 34. .

  [SI / PSI]

  FIG. 3 is a diagram illustrating an example of NIT and PMT as SI / PSI of TS of one-segment broadcasting.

  The NIT includes a service list in which information on services included in a TS transmitted in a frequency band (hereinafter also referred to as a physical channel) in which the NIT is transmitted is described.

  The NIT in FIG. 3 is an NIT in the case where two services are included in a TS transmitted in a certain physical channel, and the service list is information that identifies services for the two services. ID (ServiceID) etc. are described.

  In the ARIB (Association of Radio Industries and Businesses) standard, the PID of NIT (TS packet) is defined as 0x0010 (0x indicates that the subsequent number is a hexadecimal number).

  Therefore, the reception control unit 33 can acquire the NIT by controlling the DEMUX unit 37 (instructs PID = 0x0010) so as to separate the TS packet with the PID of 0x0010 from the TS.

  The PMT describes the PID of a TS packet (TS packet including content data) in which content data as a service is arranged.

  In FIG. 3, the TS packet PID (PCR PID) of the TS packet of PCR (Program Clock Reference) and the TS of the video data (encoded data) are used as the PID of the TS packet of the content data (TS packet in which the content data is arranged). A packet PID (Video ES (Elementary Stream) PID) and audio data (encoded data) TS packet PID (Audio ES PID) are described.

  Assuming that the service ID is represented by a variable NUM, in the ARIB standard, the PMT of the service ID of NUM, that is, the PMT of the TS packet of the content data of the service ID of NUM is described. PMT_PID, which is the PID, is expressed by the expression PMT_PID = 0x1FC8 + NUM.

  In FIG. 3, the service IDs of the two services included in the TS are 0 and 1, respectively. Therefore, the PMT_PID of the service with service ID 0 (hereinafter also referred to as service # 0) is 0x1FC8 (= 0x1FC8 + 0), and the PMT_PID of service # 1 (service with service ID 1) is 0x1FC9 (= 0x1FC8 + 1) )It has become.

  When the user performs a channel operation and the user specifies a desired service, when the service specified by the channel operation (hereinafter also referred to as a specified service) is included in the currently received TS, that is, one segment When there is no need to change the physical channel (hereinafter also referred to as the current physical channel) that is currently receiving the TS at the tuner 12, the reception control unit 33 performs the NIT (service list in which the designated service is described) of the current physical channel. NIT (including NIT) has already been acquired (should be), so by referring to the acquired NIT of the current physical channel, the service ID of the specified service included in the TS currently transmitted on the physical channel, As a result, PMT_PID can be recognized immediately.

  The reception control unit 33 can acquire the PMT of the designated service from the PMT_PID of the designated service, and can recognize the PID of the TS packet of the content of the designated service from the PMT of the designated service.

  After recognizing the PID of the TS packet of the content of the designated service, the reception control unit 33 can receive the designated service. That is, the reception control unit 33 causes the DEMUX unit 37 to separate the TS packet of the PID of the content of the designated service from the TS, and outputs the image and sound of the content (displays the image on the display device 17, the sound Can be output from the speaker 19).

  On the other hand, when the designated service is not included in the currently received TS, that is, when it is necessary to change the physical channel (current physical channel) at which the one-segment tuner 12 receives the TS, the reception control unit 33 The tuner control unit 32 is controlled so as to change the current physical channel to the physical channel through which the TS including the designated service is transmitted.

  The tuner control unit 32 controls the one-segment tuner 12 according to the control of the reception control unit 33. As a result, the one-segment tuner 12 changes the current physical channel to the physical channel to which the TS including the designated service is transmitted. As a result, the TS including the designated service is supplied from the one-segment tuner 12 to the DEMUX unit 37. The

  To receive the TS packet of the content of the specified service, the PMT_PID of the specified service is required. To recognize the PMT_PID of the specified service, the changed physical channel, that is, the TS including the specified service is transmitted. NIT being transmitted on a physical channel is required.

  Since the PID of the NIT is fixed to 0x0010 as described above, the reception control unit 33 acquires the TS packet with the PID of 0x0010 (so as to control the DEMUX unit 37) so that the designated service is Get NIT of TS including.

  After obtaining the NIT, the designated service can be received in the same manner as when the designated service is included in the currently received TS.

  That is, the reception control unit 33 refers to the NIT of the current physical channel (NIT including a service list in which the specified service is described), thereby specifying the service ID of the specified service included in the TS currently transmitted on the physical channel. And eventually recognize PMT_PID.

  Then, the reception control unit 33 acquires the PMT of the designated service from the PMT_PID of the designated service, and recognizes the PID of the TS packet of the content of the designated service from the PMT of the designated service.

  The reception control unit 33 receives the designated service based on the PID of the TS packet of the content of the designated service. That is, the reception control unit 33 causes the DEMUX unit 37 to separate the PID TS packet of the content of the designated service from the TS, and outputs the content image and audio.

  FIG. 4 is a diagram illustrating the relationship between the channel operation by the user and the service received by the reception control unit 33 by the channel operation.

  Here, for example, buttons provided with numbers 1, 2,..., 12 which are provided in the remote commander as the user I / F 16 and are operated when directly specifying a so-called channel (service) are displayed. , Channel button.

  The number displayed on the channel button is also referred to as a logical channel number.

  One channel button, that is, one logical channel number corresponds to one broadcasting station, for example.

  A single physical channel can provide (transmit) a plurality of services (programs). Each service transmitted on a physical channel is assigned a three-digit channel number, which is a three-digit number representing a logical channel on which the service is transmitted.

  In FIG. 4, in the physical channel having the logical channel number “7”, one service having the three-digit channel number “671” is provided.

  In FIG. 4, three services with three-digit channel numbers “681”, “682”, and “683” are provided in the physical channel whose logical channel number is “8”.

  Further, in FIG. 4, one service with a three-digit channel number “691” is provided in a physical channel with a logical channel number “9”.

  In one-segment broadcasting, as the upper two digits of the three-digit channel number, for example, a value obtained by adding 60 to the logical channel number is employed.

  Also, the lowest digit of the three-digit channel number represents the organization channel, and for example, integers from 1 are used in ascending order of service ID. Therefore, when only one service is provided as a one-segment broadcasting on a physical channel, the lowest digit of the three-digit channel number of that service (the logical channel that is transmitting) is “1”. become.

  In the channel operation, when the channel button is operated, the reception control unit 33 acquires the NIT of the TS transmitted on the physical channel corresponding to the logical channel number displayed on the channel button operated by the channel operation, By referring to the service list included in the NIT, the number of services provided in the physical channel (current physical channel) that acquired the NIT and the service ID are recognized.

  In the channel operation, if a channel button displaying the logical channel number of the currently received physical channel is displayed, the NIT of the TS transmitted on that physical channel (current physical channel) has already been acquired. Therefore, the reception control unit 33 can recognize the number of services currently provided on the physical channel and the service ID with reference to the acquired NIT.

  When the number of services currently provided on the physical channel is one, the reception control unit 33 selects the one service currently provided on the physical channel by the user operating the channel button as the channel operation. Determine the specified service.

  Then, the reception control unit 33 recognizes the PMT_PID of the designated service included in the TS currently transmitted on the physical channel by referring to the NIT of the current physical channel. Further, the reception control unit 33 acquires the PMT of the designated service from the PMT_PID of the designated service, and recognizes the PID of the TS packet of the content of the designated service from the PMT of the designated service.

  The reception control unit 33 receives the designated service based on the PID of the TS packet of the content of the designated service. That is, the reception control unit 33 causes the DEMUX unit 37 to separate the PID TS packet of the content of the designated service from the TS, and outputs the content image and audio.

  On the other hand, when the number of services currently provided on the physical channel is two or more, the reception control unit 33 has, for example, the service ID of the two or more services currently provided on the physical channel being the smallest. This service is determined as the designated service designated by the operation of the channel button as the channel operation by the user.

  Thereafter, the designated service is received in the same manner as when the number of services currently provided on the physical channel is one.

  Therefore, in FIG. 4, for example, when the user operates a channel button whose logical channel number is “7” (hereinafter also referred to as channel button “7”), a physical channel whose logical channel number is “7” (hereinafter, “7”). A service having a three-digit channel number “671” (hereinafter also referred to as service “671”) transmitted on the physical channel “7” is determined as a designated service and received.

  For example, when the user operates the channel button “8” (the channel button whose logical channel number is “8”), the three transmitted on the physical channel “8” corresponding to the channel button “8” are transmitted. Among the services "681" (service with a 3-digit channel number "681"), "682", and "683", the service with the smallest service ID, that is, the service with the smallest 3-digit channel number "681" Is determined by the designated service and received.

  Further, for example, when the user operates the channel button “9”, one service “691” transmitted on the physical channel “9” corresponding to the channel button “9” is determined as the designated service. Received.

  Next, reception of a service when a button for instructing channel up or down (each also referred to as a channel up button or a channel down button) is operated in the channel operation will be described.

  The 3-digit channel number of the service received immediately before the channel up button or the channel down button is operated (hereinafter also referred to as the immediately preceding service) and the physical channel (hereinafter referred to as the immediately preceding physical) to which the immediately preceding service is transmitted. The logical channel numbers representing the channel) are referred to as the immediately preceding three-digit channel number and the immediately preceding logical channel number, respectively.

  When the channel up button is operated and there is a service with a 3-digit channel number greater than the previous 3-digit channel number among the services provided on the previous physical channel, the service provided on the previous physical channel Of these, the service with the next 3-digit channel number next to the immediately preceding 3-digit channel number is determined as the designated service and received.

  That is, the reception control unit 33 refers to the NIT of the immediately preceding physical channel, and among the services provided on the immediately preceding physical channel, the service having the next 3 digit channel number next to the immediately preceding 3 digit channel number is The designated service is determined by the operation of the channel up button as the channel operation by.

  Then, the reception control unit 33 recognizes the PMT_PID of the designated service included in the TS transmitted on the immediately preceding physical channel by referring to the NIT of the immediately preceding physical channel. Further, the reception control unit 33 acquires the PMT of the designated service from the PMT_PID of the designated service, and recognizes the PID of the TS packet of the content of the designated service from the PMT of the designated service.

  Thereafter, the reception control unit 33 causes the DEMUX unit 37 to separate the PID TS packet of the content of the designated service from the TS transmitted on the immediately preceding physical channel, and outputs the image and audio of the content.

  Also, when the channel up button is operated, if there is no service with a 3-digit channel number greater than the previous 3-digit channel number among the services provided on the previous physical channel, that is, the previous 3-digit channel number. Is the maximum three-digit channel number among the services provided on the immediately preceding physical channel, for example, among the services provided on the physical channel having the next largest logical channel number after the preceding logical channel number. The service with the smallest three-digit channel number is determined as the designated service and received.

  That is, the reception control unit 33 performs tuner control so as to change the current physical channel to the physical channel to which the TS including the designated service is transmitted, that is, the physical channel having the next largest logical channel number. The unit 32 is controlled.

  As a result, the one-segment tuner 12 changes the current physical channel to the physical channel to which the TS including the designated service is transmitted. As a result, the TS including the designated service is supplied from the one-segment tuner 12 to the DEMUX unit 37. The

  The reception control unit 33 acquires the NIT of the TS including the designated service supplied to the DEMUX unit 37 and refers to the service list included in the NIT, thereby acquiring the physical channel (current physical channel). Recognize the number of services and service IDs provided by.

  The reception control unit 33 selects the service with the smallest service ID (also the service with the smallest three-digit channel number) from among the services currently provided on the physical channel by the channel up operation as the channel operation by the user. Determine the specified service.

  Then, the reception control unit 33 recognizes the PMT_PID of the designated service included in the TS currently transmitted on the physical channel by referring to the NIT of the current physical channel. Further, the reception control unit 33 acquires the PMT of the designated service from the PMT_PID of the designated service, and recognizes the PID of the TS packet of the content of the designated service from the PMT of the designated service.

  The reception control unit 33 causes the DEMUX unit 37 to separate the PID TS packet of the content of the designated service from the TS, and outputs the content image and audio.

  On the other hand, when the channel down button is operated, if there is a service with a 3-digit channel number smaller than the previous 3-digit channel number among the services provided on the previous physical channel, it is provided on the previous physical channel. Of the services, the service with the next three-digit channel number next to the previous three-digit channel number is determined as the designated service and received.

  In other words, the reception control unit 33 refers to the NIT of the immediately preceding physical channel, and among the services provided on the immediately preceding physical channel, the service having the next 3 digit channel number next to the immediately preceding 3 digit channel number is The designated service is determined by the operation of the channel down button as the channel operation by.

  Then, the reception control unit 33 recognizes the PMT_PID of the designated service included in the TS transmitted on the immediately preceding physical channel by referring to the NIT of the immediately preceding physical channel. Further, the reception control unit 33 acquires the PMT of the designated service from the PMT_PID of the designated service, and recognizes the PID of the TS packet of the content of the designated service from the PMT of the designated service.

  Thereafter, the reception control unit 33 causes the DEMUX unit 37 to separate the PID TS packet of the content of the designated service from the TS transmitted on the immediately preceding physical channel, and outputs the image and audio of the content.

  When the channel down button is operated, if there is no service with a 3-digit channel number smaller than the previous 3-digit channel number among the services provided on the previous physical channel, that is, the previous 3-digit channel number. Is the smallest three-digit channel number of services provided on the previous physical channel, the largest of the services provided on the physical channel with the next lower logical channel number than the previous logical channel number. The three-digit channel number service is determined as the designated service and received.

  That is, the reception control unit 33 performs tuner control so as to change the current physical channel to the physical channel to which the TS including the designated service is transmitted, that is, the physical channel having the next smallest logical channel number after the previous logical channel number. The unit 32 is controlled.

  As a result, the one-segment tuner 12 changes the current physical channel to the physical channel to which the TS including the designated service is transmitted. As a result, the TS including the designated service is supplied from the one-segment tuner 12 to the DEMUX unit 37. The

  The reception control unit 33 acquires the NIT of the TS including the designated service supplied to the DEMUX unit 37 and refers to the service list included in the NIT, thereby acquiring the physical channel (current physical channel). Recognize the number of services and service IDs provided by.

  The reception control unit 33 selects the service with the largest service ID (also the service with the largest three-digit channel number) from among the services currently provided on the physical channel by the channel up operation as a channel operation by the user. Determine the specified service.

  Then, the reception control unit 33 recognizes the PMT_PID of the designated service included in the TS currently transmitted on the physical channel by referring to the NIT of the current physical channel. Further, the reception control unit 33 acquires the PMT of the designated service from the PMT_PID of the designated service, and recognizes the PID of the TS packet of the content of the designated service from the PMT of the designated service.

  The reception control unit 33 causes the DEMUX unit 37 to separate the PID TS packet of the content of the designated service from the TS, and outputs the content image and audio.

  Therefore, in FIG. 4, for example, when the service “671” provided on the physical channel “7” is received, when the channel up button is operated, the service provided on the physical channel “7”. There is no service with a three-digit channel number greater than service "671", so service "681", which is provided on physical channel "8" with the next largest logical channel number after physical channel "7", Among the “682” and “683”, the service “681” having the minimum three-digit channel number is determined as the designated service and received.

  When the service “681” provided on the physical channel “8” is received and the channel up button is operated, the services “681” and “682” provided on the physical channel “8” are operated. In "and" "683", there is a service with a three-digit channel number larger than service "681", so services "681", "682", and so on provided on physical channel "8" Of the “683”, the service “682” having the three-digit channel number next to the service “681” is determined as the designated service and received.

  Thereafter, when the channel up button is further operated, the service “682” of the services “681”, “682”, and “683” provided on the physical channel “8” is similarly processed. Next, the service “683” having the largest 3-digit channel number is determined as the designated service and received.

  When the service “683” provided on the physical channel “8” is received and the channel up button is operated, the services “681” and “682” provided on the physical channel “8” are operated. Since there is no service with a 3-digit channel number greater than service "683" in "and" 683, it is provided on physical channel "9" with the next largest logical channel number after physical channel "8". Among the existing services, the service “691” having the smallest three-digit channel number is determined as the designated service and received.

  On the other hand, in FIG. 4, for example, when the service “691” provided on the physical channel “9” is received, when the channel down button is operated, the service provided on the physical channel “9”. Service with a three-digit channel number smaller than service "691" does not exist, so service "681", which is provided on physical channel "8" with the smallest logical channel number next to physical channel "9", Among the “682” and “683”, the service “683” having the maximum three-digit channel number is determined as the designated service and received.

  When the service “683” provided on the physical channel “8” is received and the channel down button is operated, the services “681” and “682” provided on the physical channel “8” are operated. Since there is a service with a three-digit channel number smaller than the service “683” in “683”, the services “681”, “682”, and the services provided on the physical channel “8” Of the “683”, the service “682” having the next three-digit channel number after the service “683” is determined as the designated service and received.

  Thereafter, when the channel down button is further operated, the service “682” of the services “681”, “682”, and “683” provided on the physical channel “8” is similarly processed. Next, the service “681” having the smallest 3-digit channel number is determined as the designated service and received.

  When the service “681” provided on the physical channel “8” is received and the channel down button is operated, the services “681” and “682” provided on the physical channel “8” are operated. In "683", there is no service with a three-digit channel number smaller than service "681", so it is provided on physical channel "7" with the logical channel number next to physical channel "8". Among the existing services, the service “671” having the maximum three-digit channel number is determined as the designated service and received.

  [Process during channel operation]

  When the channel operation is performed, the reception control unit 33 performs an output control process for outputting the content of the service (designated service) specified by the channel operation.

  Processing modes of output control processing performed by the reception control unit 33 include a normal mode and a high speed mode.

  FIG. 5 is a timing chart for explaining output control processing in the normal mode and the high-speed mode.

  In the following, output control processing when a channel operation for changing the physical channel received by the one-segment tuner 12 (channel operation for changing the TS supplied from the one-segment tuner 12 to the DEMUX unit 37) is performed. explain.

  When a channel operation in which the physical channel is changed is performed, the reception control unit 33 receives the service provided on the changed physical channel in either the normal mode or the high-speed mode. The one-segment tuner 12 controls the tuner control unit 32 so as to receive the TS transmitted on the changed physical channel.

  Then, the tuner control unit 32 controls the one-segment tuner 12 according to the control of the reception control unit 33, and the one-segment tuner 12 receives the TS transmitted on the changed physical channel and supplies it to the DEMUX unit 37. Then, in the normal mode, the reception control unit 33 acquires the NIT of the TS transmitted on the changed physical channel (S11).

  Further, the reception control unit 33 acquires the PMT of the service (designated service) designated by the channel operation by the user from the TS NIT transmitted on the changed physical channel (S12), and designates from the PMT. The DEMUX unit 37 is controlled to acquire (separate) TS packets of service content.

  For the content (data) of the designated service acquired by the DEMUX unit 37, the content such as decoding by the video decoder 38 and the audio decoder 41 and buffering by the video buffer 39 and the audio buffer 42 is output. Preparation for output is performed (S13), and then the content for which output preparation is completed is output (the image of the content is displayed and sound is output) (S14).

  Therefore, in the normal mode, the service switching time T from when the user performs the channel operation until the content of the designated service is output (presented to the user) is expressed by Expression (1).

T = Ttuner + Tnit + Tpmt + Tdec
... (1)

  Here, Ttuner represents the time required for channel selection of the changed physical channel when the one-segment tuner 12 receives the TS transmitted on the changed physical channel, and Tnit is transmitted on the changed physical channel. It represents the time required to obtain the NIT of the incoming TS. Tpmt represents the time required to acquire the pmt of the service included in the TS transmitted on the changed physical channel, and Tdec represents the time required for output preparation such as decoding of the content of the specified service. .

  In 1Seg broadcasting (terrestrial digital broadcasting), the NIT transmission cycle is 1 second (Typical) and the PMT transmission cycle is 200 milliseconds (Typical). T is represented by Formula (2).

T = Ttuner + 1.2 seconds + Tdec
... (2)

  By the way, in one-segment broadcasting currently performed in Japan, it is extremely rare that one TS includes two or more services. Therefore, in the high-speed mode, output control processing is performed on the assumption that only one default service with a service ID of 0 is included in one TS.

  Here, if it is assumed that only one default service with a service ID of 0 is included in one TS, the service ID of the default service is 0. Therefore, the PMT_PID of the default service is the expression PMT_PID = 0x1FC8 + NUM = 0x1FC8 It becomes.

  Therefore, assuming that only one default service with a service ID of 0 is included in one TS, the PMT of the default service (hereinafter also referred to as default PMT) is acquired without acquiring the NIT (S21), From the default PMT, the content of the default service can be acquired (separated from the TS) to prepare for output (S22).

  As a result, the service switching time T in the high-speed mode is shorter than the service switching time T in the normal mode of Expression (1) by the time Tnit required to acquire the NIT, and is expressed by Expression (3).

T = Ttuner + Tpmt + Tdec
... (3)

  That is, according to the high-speed mode, after the channel operation is performed, the content of the service specified by the channel operation can be output earlier by the time Tnit of about 1 second than in the normal mode.

  In high-speed mode, it is assumed that the default service assumption that assumes that only one default service with a service ID of 0 is included in one TS is satisfied. If the TS transmitted on the physical channel of this service includes multiple services or only one service, but the service ID of that one service is not 0, the service specified by the channel operation ( (Designated service) may not be received.

  Therefore, in the high-speed mode, the reception control unit 33 changes the acquisition in parallel with the acquisition of the default service PMT (default PMT) and the output preparation of the content (default service content) in which the PID is described in the default PMT. The NIT of the TS transmitted on the subsequent physical channel is acquired (S23), and the default PMT is the PMT of the service (specified service) specified by the channel operation based on the service list described in the NIT. In other words, service confirmation is performed to confirm that the default service is correct as the specified service (the specified service is the default service) (S24).

  When it is confirmed that the default PMT is the PMT of the designated service, that is, when the designated service is the default service, the reception control unit 33 displays the content of the default service (PID is described in the default PMT). The output of (content) is started (S25).

  In general, the time required for content output preparation, in particular, the time required for decoding is longer than the time Tnit required for NIT acquisition, so it is possible to acquire NIT and perform service confirmation during output preparation. For this reason, the service switching time T does not change whether or not NIT acquisition and service confirmation performed in parallel with output preparation are performed.

  Therefore, even if NIT acquisition and service confirmation are performed in parallel with output preparation, the service switching time T is expressed by equation (3) as in the case where NIT acquisition and service confirmation are not performed. Is done.

  As a result of the service confirmation, when it is confirmed that the designated service is not the default service, the reception control unit 33 obtains the PMT of the designated service from the NIT obtained in parallel with the output preparation (S26), and the PMT Then, the DEMUX unit 37 is controlled so as to acquire the TS packet of the content of the designated service.

  For the content (data) of the designated service acquired by the DEMUX unit 37, the content such as decoding by the video decoder 38 and the audio decoder 41 and buffering by the video buffer 39 and the audio buffer 42 is output. Preparation for output is performed (S27), and then the content for which output preparation is completed is output (S28).

  Therefore, when it is confirmed that the designated service is not the default service, the service switching time T is the time Ttuner required for channel selection of the physical channel after the change by the one-segment tuner 12, the time Tpmt1 required for obtaining the default PMT, the output preparation Time Tnit required for NIT acquisition performed in parallel, time Tpmt2 required for PMT acquisition of specified service after it is confirmed that the specified service is not the default service, and time required for preparation of content output for specified service A value obtained by adding Tdec is represented by Expression (4).

T = Ttuner + Tpmt1 + Tnit + Tpmt2 + Tdec
... (4)

  Therefore, even when the designated service is not the default service, the service switching time T is only the time Tpmt1 of about 200 milliseconds, which is the same as in the normal mode.

  Note that the acquisition of the default PMT and the acquisition of the NIT can be performed in parallel, and the time Tnit required to acquire the NIT is longer than the time Tpmt1 required to acquire the default PMT, so in most cases the default PMT The time Tpmt1 required to acquire NIT is absorbed by the time Tnit required to acquire NIT (Tpmt1 = 0 in equation (4)). In this case, the service switching time T expressed by the equation (4) is expressed by the equation Ttuner + Tnit + Tpmt2 + Tdec, which is the same as in the normal mode.

  With reference to FIG. 5, the output control processing in each of the normal mode and the high speed mode will be further described.

  In the normal mode, when a channel operation for changing the physical channel is performed by the user, the reception control unit 33 causes the one-segment tuner 12 to receive a TS transmitted on the changed physical channel. Accordingly, the one-segment tuner 12 receives the TS transmitted on the changed physical channel and supplies the TS to the DEMUX unit 37.

  In step S11, the reception control unit 33 waits for (receives) the TS NIT transmitted on the changed physical channel.

  That is, the reception control unit 33 supplies 0x0010, which is the PID of the NIT, to the DEMUX unit 37. The DEMUX unit 37 separates the TS packet with the PID of 0x0010 from the TS from the one-segment tuner 12, and the reception control unit After waiting to be supplied to the terminal 33, the NIT that is the data of the TS packet whose PID is 0x0010 is acquired.

  In FIG. 5, for simplicity of explanation, the time Ttuner required for the one-segment tuner 12 to select the changed physical channel is set to zero.

  Upon obtaining the NIT, the reception control unit 33 refers to the service list described in the NIT, and determines the designated service (service ID) designated by the channel operation by the user as described in FIG. In addition, the PMT_PID of the designated service is recognized.

  Thereafter, in step S12, the reception control unit 33 waits for the PMT of the designated service to be transmitted based on the PMT_PID of the designated service, and acquires the PMT of the designated service.

  That is, the reception control unit 33 supplies the PMT_PID of the designated service to the DEMUX unit 37, and the DEMUX unit 37 separates the TS packet with the PID of the designated service PMT_PID from the TS from the one-segment tuner 12, and performs reception control. After waiting for supply to the unit 33, the PMT of the designated service, which is the data of the TS packet of PMT_PID, is acquired.

  After acquiring the PMT of the designated service, the reception control unit 33 performs output preparation for preparing the output of the content of the designated service, that is, the content in which the PID is described in the designated service PMT, in step S13.

  That is, the reception control unit 33 causes the DEMUX unit 37 to separate the PID TS packet described in the designated service PMT from the TS from the one-segment tuner 12, that is, the content data of the designated service, and the video decoder 38. Or the audio decoder 41.

  Further, the reception control unit 33 causes the video decoder 38 and the audio decoder 41 to decode the content data of the designated service, and causes the video buffer 39 and the audio buffer 42 to buffer the decoded content data.

  Then, when the output preparation is completed, that is, for example, when content data having a certain amount of data is buffered in the video buffer 39 and the audio buffer 42, in step S14, the reception control unit 33 The image and sound corresponding to the content data buffered in the audio buffer 42 are output (the image is displayed on the display device 17 and the sound is output from the speaker 19).

  On the other hand, in the high-speed mode, when a channel operation for changing the physical channel is performed by the user, the reception control unit 33 uses the one-segment tuner 12 to transmit the TS transmitted on the changed physical channel, as in the normal mode. The tuner control unit 32 is controlled to receive. As a result, the one-segment tuner 12 receives the TS transmitted on the changed physical channel and supplies the TS to the DEMUX unit 37.

  In step S21, the reception control unit 33 assumes that the designated service is a default service transmitted on the changed physical channel, and is a PMT of the default service transmitted on the changed physical channel. The default PMT, that is, the PID is acquired after waiting for a TS packet of 0x1FC8 determined in advance as the PMT_PID of the PMT of the default service.

  After acquiring the default PMT, the reception control unit 33 performs output preparation in step S22 to prepare output of default service content, that is, content in which PID is described in the default PMT.

  In the high-speed mode, the reception control unit 33 parallels the acquisition of the default PMT in step S21 and the output preparation of the content of the default service in step S22 as described above. In step S23, the reception control unit 33 uses the changed physical channel. Wait for the NIT of the TS to be sent and get it.

  Upon obtaining the NIT, the reception control unit 33 refers to the service list described in the NIT, and determines the designated service (service ID) designated by the channel operation by the user as described in FIG. In addition, the PMT_PID of the designated service is recognized.

  In step S24, the reception control unit 33 performs service confirmation to confirm that the default service is the designated service, that is, the assumption that the designated service is the default service is correct.

  As a result of the service confirmation in step S24, when it is confirmed that the assumption that the designated service is the default service is correct, that is, the service ID of the designated service described in the NIT service list is the service ID of the default service. If the predetermined value is 0, in step S25, the reception control unit 33 waits for the completion of output preparation in step S22, and the image and audio corresponding to the content data of the default service for which output preparation has been completed. Is output.

  As described above, in the high-speed mode, when the assumption that the designated service is the default service is correct, the time Tnit required for acquiring the NIT, which is performed in step S11, is about 1 second as compared with the normal mode. The service switching time T can be shortened.

  On the other hand, as a result of the service confirmation in step S24, it is confirmed that the assumption that the designated service is the default service is incorrect, that is, the service ID of the designated service described in the NIT service list is the default service. If the service ID is not 0, which is determined in advance, the reception control unit 33 waits for the PMT of the designated service to be transmitted based on the PMT_PID of the designated service in step S26, and acquires the PMT of the designated service. .

  After acquiring the PMT of the designated service, the reception control unit 33 performs output preparation for preparing the output of the content of the designated service, that is, the content in which the PID is described in the designated service PMT, in step S27.

  In step S28, the reception control unit 33 waits for the completion of output preparation in step S27, and outputs an image and sound corresponding to the content data of the designated service for which output preparation has been completed.

  As described above, in the high-speed mode, even if the assumption that the designated service is the default service is not correct, the service switching time T is approximately the same as that in the normal mode.

  [Output control processing in normal mode]

  FIG. 6 is a flowchart for explaining the output control process in the normal mode.

  In step S41, the reception control unit 33 determines whether or not the channel operation by the user has been performed. If it is determined that the channel operation has not been performed, the process returns to step S41.

  If it is determined in step S41 that a channel operation has been performed, the process proceeds to step S42, and the reception control unit 33 displays an image on the display device 17 and outputs sound from the speaker 19. Mute (stop), and the process proceeds to step S43.

  In step S43, the reception control unit 33 controls the tuner control unit 32 so that the one-segment tuner 12 receives the physical channel through which the TS including the designated service designated by the user by channel operation is transmitted. Thus, the TS NIT (TS packet with PID 0x0010) is acquired (received) after waiting for the transmission.

  Then, the process proceeds from step S43 to step S44, and the reception control unit 33 refers to the service list described in the NIT acquired in step S43, and as described with reference to FIG. The designated designated service (service ID) is determined, and further, the PMT_PID of the designated service is recognized, and the process proceeds to step S45.

  In step S45, the reception control unit 33 waits for the PMT of the designated service to be transmitted based on the PMT_PID of the designated service, acquires the PMT of the designated service, and the process proceeds to step S46.

  In step S46, for example, the reception control unit 33 instructs the DEMUX unit 37 to acquire (separate from the TS) the TS packet of the content of the designated service based on the PMT of the designated service. The preparation for outputting the content of the designated service, such as instructing the video decoder 38 and the audio decoder 41 to perform decoding, is started, and the process proceeds to step S47.

  In step S47, the reception control unit 33 waits for completion of the output preparation of the content of the designated service, cancels the muting of the image and audio output performed in step S42, and completes the content of the designated service ready for output. The image and sound corresponding to the data are output.

  Thereafter, the process returns from step S47 to step S41, and the same process is repeated thereafter.

  When the channel operation is not an operation that requires changing the physical channel received by the one-segment tuner 12, that is, the TS currently received by the one-segment tuner 12 includes a plurality of services, and the channel operation is performed. For example, when the channel up button or the channel down button is operated in which one of the plurality of services becomes the designated service, the NIT of the TS currently received by the one-segment tuner 12 Has already been acquired (should be), the process of step S43 can be skipped.

  [High-speed mode output control processing]

  FIG. 7 is a flowchart for explaining output control processing in the high-speed mode.

  In step S51, the reception control unit 33 determines whether or not the channel operation by the user has been performed. If it is determined that the channel operation has not been performed, the process returns to step S51.

  If it is determined in step S51 that a channel operation has been performed, the process proceeds to step S52, and the reception control unit 33 displays an image on the display device 17 and outputs sound from the speaker 19. The process proceeds to step S53.

  In step S53, the reception control unit 33 controls the tuner control unit 32 so that the one-segment tuner 12 receives the physical channel through which the TS including the designated service designated by the user by the channel operation is transmitted, and the physical channel. The default PMT (PID is 0x1FC8 TS packet determined in advance as the PMT_PID of the PMT of the default service), which is the PMT of the default service transmitted in step S1, is acquired.

  Then, the process proceeds from step S53 to step S54, and the reception control unit 33 starts preparation for output such as an instruction to decode the content of the default service based on the default PMT.

  Further, the reception control unit 33 waits for NIT (TS packet with PID 0x0010) to be transmitted, obtains it in step S55, and the process proceeds to step S56.

  Here, waiting for the NIT to be transmitted means that the one-segment tuner 12 receives the physical channel from which the reception control unit 33 transmits the TS including the designated service designated by the user by the channel operation. The tuner control unit 32 is controlled so that the one-segment tuner 12 starts outputting the TS transmitted on the physical channel.

  In step S56, the reception control unit 33 refers to the service list described in the NIT acquired in step S55, and as described in FIG. 4, the specified service (service ID of the specified service specified by the channel operation by the user). ) And the PMT_PID of the designated service is recognized, and the process proceeds to step S57.

  In step S57, the reception control unit 33 confirms whether or not the assumption that the designated service is the default service is correct based on the service ID of the designated service as a service confirmation for confirming that the default service is the designated service. Determine.

  If it is determined in step S57 that the assumption that the designated service is the default service is correct, that is, the service ID of the designated service described in the NIT service list acquired in step S55 (determined in step S56). If the service ID of the designated service is 0 determined as the service ID of the default service, the process skips steps S58 and S59, proceeds to step S60, and the reception control unit 33 starts in step S54. Waiting for the output preparation of the default service content completed, the image and audio output mute performed in step S52 is released, and the image and audio corresponding to the default service content data ready for output is released. Is output.

  On the other hand, if it is determined in step S57 that the assumption that the designated service is the default service is not correct, that is, the service ID of the designated service described in the service list of the NIT acquired in step S55 (in step S56). If the determined service ID of the designated service is not 0 determined as the service ID of the default service, the process proceeds to step S58, and the reception control unit 33 sets the PMT_PID of the designated service recognized in step S56. Based on this, it waits for the PMT of the designated service to be transmitted, acquires the PMT of the designated service, and the process proceeds to step S59.

  In step S59, the reception control unit 33 starts preparation for output such as an instruction for decoding the content of the designated service based on the PMT of the designated service, and the process proceeds to step S60.

  In step S60, the reception control unit 33 waits for completion of the output preparation of the content of the designated service, cancels the muting of the image and audio output performed in step S52, and completes the content of the designated service ready for output. The image and sound corresponding to the data are output.

  Thereafter, the process returns from step S60 to step S51, and the same process is repeated thereafter.

  When the channel operation is not an operation that requires changing the physical channel received by the one-segment tuner 12, that is, the TS currently received by the one-segment tuner 12 includes a plurality of services, and the channel operation is performed. For example, when the channel up button or the channel down button is operated in which one of the plurality of services becomes the designated service, the NIT of the TS currently received by the one-segment tuner 12 Has already been acquired (should be), the processing of steps S53 to S57 can be skipped.

  In this case, in step S58, the reception control unit 33 waits for the PMT of the specified service to be transmitted based on the PMT_PID of the specified service recognized from the acquired NIT, and acquires the PMT of the specified service. . Thereafter, the process proceeds sequentially from step S58 to step S59 and subsequent steps, and the same process as described above is performed.

  As described above, in the output control processing in the high-speed mode, for one-segment broadcasting, only one default service is included in one TS, and the designated service is the default service. The default PMT is acquired, and in parallel with the output preparation of the content (default service content) whose PID is described in the default PMT, the NIT is acquired, and based on the service list described in the NIT, It is assumed that the default PMT is the PMT of the specified service specified by the user through channel operation (the service ID of the specified service is 0, which is the service ID of the default service), and that the specified service is the default service. Check the service and confirm that the specified service is the default service. When it is confirmed that the assumption is correct, the output of the default service content (contents in which the PID is described in the default PMT) is started, so PMT and NIT are stored in non-volatile memory (semi-permanently) ) Service switching time from the channel operation to the output of the specified service content specified by the channel operation can be shortened with simple processing without performing processing such as saving. .

  Here, in this embodiment, in order to simplify the output control processing in the high-speed mode, assuming that the designated service is the default service, a PMT (default PMT) of PID = 0x1FC8 determined in advance for the default service is set. The service switching time has been shortened by acquiring the service list. In addition, for example, the service list included in the NIT is stored in the nonvolatile memory for each physical channel to which the TS is transmitted, and the service list is stored. The service switching time can also be shortened by determining the designated service (service ID) and obtaining the PMT of the designated service with reference to FIG.

  Note that the present technology can be applied to a reception system that receives an arbitrary one-segment broadcast that broadcasts image and audio, audio only, or other arbitrary data.

  Further, the normal mode and the high speed mode can be switched in accordance with, for example, a user operation.

  Furthermore, in the reception control apparatus (FIG. 2), not only the normal mode and the high speed mode but also the high speed mode can be mounted.

  In addition to the case where the channel operation is performed by the user, the present technology can also be applied to a case where the channel operation is performed by, for example, control of viewing reservation or recording reservation performed by the user.

  Furthermore, the program executed by the CPU 15 (FIG. 1) can be preinstalled in the nonvolatile memory 13 or can be recorded on a removable recording medium such as an optical disk or a semiconductor memory and provided as so-called package software.

  Then, the program can be installed in the receiving system (FIG. 1) from the removable recording medium as described above.

  Further, the program can be downloaded to the receiving system via a communication network or a broadcast network and installed in the built-in nonvolatile memory 13. That is, for example, the program is wirelessly transferred to a receiving system from a download site via an artificial satellite for digital satellite broadcasting, or wired to the receiving system via a network such as a LAN (Local Area Network) or the Internet. Can be transferred.

  Here, in the present specification, the processing performed by the CPU 15 according to the program does not necessarily have to be performed in time series in the order described as the flowchart. That is, the processing performed by the CPU 15 according to the program includes processing executed in parallel or individually (for example, parallel processing or object processing).

  Further, the program may be processed by one computer (processor) or may be distributedly processed by a plurality of computers. Furthermore, the program may be transferred to a remote computer and executed.

  Furthermore, in this specification, the system means a set of a plurality of components (devices, modules (parts), etc.), and it does not matter whether all the components are in the same housing. Accordingly, a plurality of devices housed in separate housings and connected via a network and a single device housing a plurality of modules in one housing are all systems. .

  The embodiments of the present technology are not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present technology.

  For example, the present technology can take a configuration of cloud computing in which one function is shared by a plurality of devices via a network and is jointly processed.

  In addition, each step described in the above flowchart can be executed by being shared by a plurality of apparatuses in addition to being executed by one apparatus.

  Further, when a plurality of processes are included in one step, the plurality of processes included in the one step can be executed by being shared by a plurality of apparatuses in addition to being executed by one apparatus.

  In addition, this technique can take the following structures.

[1]
It has a reception control unit that controls reception of one-segment broadcasting,
The reception control unit
The one-segment broadcasting is performed in parallel with obtaining a default PMT which is a PMT (Program Map Table) of a predetermined PID (Packet Identifier) and preparing output of contents in which the PID is described in the default PMT. The NIT is acquired, and based on the service list described in the NIT, a service check is performed to confirm that the default PMT is a PMT of a service specified by the user,
When the default PMT is a PMT of a service designated by the user, a control device that starts outputting content in which a PID is described in the default PMT.
[2]
When the default PMT is not the PMT of the service specified by the user, the reception control unit acquires the PMT of the service specified by the user, and prepares output of the content in which the PID is described in the PMT. The control device according to [1], wherein output of the content is started.
[3]
When the service specified by the user is a service that is broadcast in a frequency band different from the signal of the frequency band that the tuner that receives the one-segment broadcast is currently receiving, the reception control unit is:
In parallel with obtaining the default PMT and preparing the output of the content in which the PID is described in the default PMT, the service confirmation is performed,
The control device according to [1] or [2], in which, when the default PMT is a PMT of a service designated by the user, output of content in which a PID is described in the default PMT is started.
[4]
The reception control unit of a control device including a reception control unit that controls reception of one-segment broadcasting,
The one-segment broadcasting is performed in parallel with obtaining a default PMT which is a PMT (Program Map Table) of a predetermined PID (Packet IDentifier) and preparing output of contents in which the PID is described in the default PMT. The NIT is acquired, and based on the service list described in the NIT, a service check is performed to confirm that the default PMT is a PMT of a service specified by the user,
When the default PMT is a PMT of a service designated by the user, a control method includes a step of starting output of content in which a PID is described in the default PMT.
[5]
A program for causing a computer to function as a reception control unit that controls reception of one-segment broadcasting,
The reception control unit
The one-segment broadcasting is performed in parallel with obtaining a default PMT which is a PMT (Program Map Table) of a predetermined PID (Packet IDentifier) and preparing output of contents in which the PID is described in the default PMT. The NIT is acquired, and based on the service list described in the NIT, a service check is performed to confirm that the default PMT is a PMT of a service specified by the user,
When the default PMT is a PMT of a service designated by the user, a program for starting output of content in which a PID is described in the default PMT.

  11 antenna, 12 one-segment tuner, 13 nonvolatile memory, 14 DRAM, 15 CPU, 16 user I / F, 17 display device, 18 DAC / AMP, 19 speaker, 31 user input processing unit, 32 tuner control unit, 33 reception control unit , 34 database, 35 display processing unit, 36 OSD plane, 37 DEMUX unit, 38 video decoder, 39 video buffer, 40 synthesis processing unit, 41 audio decoder, 42 audio buffer

Claims (5)

It has a reception control unit that controls reception of one-segment broadcasting,
The reception control unit
The one-segment broadcasting is performed in parallel with obtaining a default PMT which is a PMT (Program Map Table) of a predetermined PID (Packet Identifier) and preparing output of contents in which the PID is described in the default PMT. The NIT is acquired, and based on the service list described in the NIT, a service check is performed to confirm that the default PMT is a PMT of a service specified by the user,
When the default PMT is a PMT of a service designated by the user, a control device that starts outputting content in which a PID is described in the default PMT. When the default PMT is not the PMT of the service specified by the user, the reception control unit acquires the PMT of the service specified by the user, and prepares output of the content in which the PID is described in the PMT. The control device according to claim 1, wherein output of the content is started. When the service specified by the user is a service that is broadcast in a frequency band different from the signal of the frequency band that the tuner that receives the one-segment broadcast is currently receiving, the reception control unit is:
In parallel with obtaining the default PMT and preparing the output of the content in which the PID is described in the default PMT, the service confirmation is performed,
The control device according to claim 1, wherein when the default PMT is a PMT of a service designated by the user, output of content in which a PID is described in the default PMT is started. The reception control unit of a control device including a reception control unit that controls reception of one-segment broadcasting,
The one-segment broadcasting is performed in parallel with obtaining a default PMT which is a PMT (Program Map Table) of a predetermined PID (Packet IDentifier) and preparing output of contents in which the PID is described in the default PMT. The NIT is acquired, and based on the service list described in the NIT, a service check is performed to confirm that the default PMT is a PMT of a service specified by the user,
When the default PMT is a PMT of a service designated by the user, a control method includes a step of starting output of content in which a PID is described in the default PMT. A program for causing a computer to function as a reception control unit that controls reception of one-segment broadcasting,
The reception control unit
The one-segment broadcasting is performed in parallel with obtaining a default PMT which is a PMT (Program Map Table) of a predetermined PID (Packet IDentifier) and preparing output of contents in which the PID is described in the default PMT. The NIT is acquired, and based on the service list described in the NIT, a service check is performed to confirm that the default PMT is a PMT of a service specified by the user,
When the default PMT is a PMT of a service designated by the user, a program for starting output of content in which a PID is described in the default PMT.

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