JP2014168187A - Digital broadcast receiver and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital broadcast receiver etc., capable of reducing risk of overflowing by selecting a type of data to be stored according to the storage capacity of a buffer part and thereby decreasing an amount of writing to the buffer part.SOLUTION: A digital broadcast receiver includes a reception part which receives a digital broadcast comprising a plurality of packets, a control part which transfers the packets received by the reception part to a buffer part for temporary storage, and a storage part which stores a content obtained by decoding the packets transferred to the buffer part, and has a table stored with a predetermined threshold and packet identification information associatively. When the buffering amount of the buffer part is equal to or larger than the predetermined threshold, the control part performs control to transfer packets, corresponding to the packet identification information stored in the table, among the packets received by the reception part to the buffer part.

Description

  The present invention relates to a digital broadcast receiver and the like.

  Conventionally, digital broadcast receiving apparatuses that receive digital broadcasts are known. Known digital receivers include, for example, stationary devices such as liquid crystal televisions and STBs, and mobile devices such as mobile phones and smartphones.

  Here, when a digital broadcast is received using a digital broadcast receiving apparatus, for example, when playing back or recording, a buffer for temporarily storing decoded packets is generally used to reduce the load. is there.

  As an invention using a buffer, for example, provided with a buffer remaining amount monitoring means for controlling the start and stop of the reading of the data reading means according to the remaining amount of the buffer after demultiplexing the video or audio transport stream, In normal AV playback, the output timing is controlled by the switching means, AV playback is performed by the output timing control means at the same output timing as the broadcast wave, and the output timing is not controlled by the switching means in the special AV playback of double speed playback. An invention has been disclosed in which the buffer amount is monitored by a buffer remaining amount monitoring means to control the start and stop of data reading of the data reading means (see, for example, Patent Document 1).

JP 2004-336332 A

  In recent years, high-bit-rate content such as ISDB-Tmm storage services and moving image downloads from communication networks has frequently been written into terminal storage.

  When storing high bit rate content and digital broadcast recording (for example, one-segment recording) simultaneously in the same storage area (main unit memory, SD card (registered trademark), etc.), access to the same device is concentrated, It is conceivable that the write time / response time in the storage area becomes long and the storage buffer overflows.

  Here, in the above prior art, the amount of unprocessed data in the buffer is monitored, and control is performed to stop or not to stop reading data from the buffer according to the amount, but the amount of data to be processed as a whole Since there is no change, there is a possibility that overflow occurs before the buffer if the amount of data to be processed is large.

  For example, when high bit rate content storage and broadcast wave recording are performed at the same time, the amount of data to be buffered increases and data reading stops, so content storage fails or the recorded data is interrupted. There was a possibility that I could get lost.

  This will be specifically described with reference to the drawings. FIG. 10A is a schematic diagram showing received one-segment data and received moving image data. Here, “A” indicates an audio packet (data), V indicates a video packet (data), D indicates a data broadcast packet (data), and C indicates a caption packet (data).

  FIG. 10B shows a state in which the one-segment data and the moving image data are recorded at the same time. As described above, the moving image data and the one-segment data are recorded in the same area, thereby causing a problem that the one-segment data that can be written per unit time is reduced.

  In view of the above-described problems, an object of the present invention is to select the data type to be stored according to the storage amount of the buffer unit, thereby reducing the amount of writing to the buffer unit and reducing the risk of overflow. It is to provide a digital broadcast receiver and the like.

  In view of the above-described problems, the digital broadcast receiving apparatus of the present invention includes a receiving unit that receives a digital broadcast composed of a plurality of packets, and a buffer unit that temporarily stores the packets received by the receiving unit. A control unit that performs control to transfer, and a storage unit that stores content decoded from the packet transferred to the buffer unit, and has a table that stores a predetermined threshold and packet identification information in association with each other. And when the buffer amount of the buffer unit is equal to or greater than a predetermined threshold, the control unit selects a packet corresponding to the packet identification information stored in the table from among the packets received by the receiving unit. It is characterized by carrying out the control to transfer to.

  The digital broadcast receiving apparatus of the present invention is a control for performing control to transfer a digital broadcast composed of a plurality of packets to a receiving unit and a buffer unit for temporarily storing the packets received by the receiving unit. And a storage unit that stores content decoded from the packet transferred to the buffer unit, and has a table that stores predetermined threshold values and packet identification information in association with each other, and the control unit When the buffer amount of the buffer unit is equal to or larger than a predetermined threshold, the packet corresponding to the packet identification information stored in the table is not transferred to the buffer unit among the packets received by the receiving unit. It is characterized by that.

  The program according to the present invention includes a receiving unit that receives a digital broadcast composed of a plurality of packets, and a buffer unit that temporarily stores packets received by the receiving unit. A program that realizes a control function that performs control to transfer the packet received by the buffer unit to the buffer unit, and a content storage function that performs control to store the content decoded from the packet transferred to the buffer unit. The computer stores a table that stores a predetermined threshold and packet identification information in association with each other, and the control function is configured to receive the reception when the buffer amount of the buffer unit is equal to or larger than the predetermined threshold. Among the packets received by the communication unit, packets corresponding to the packet identification information stored in the table are And performing control to transfer the file unit.

  The program according to the present invention includes a receiving unit that receives a digital broadcast composed of a plurality of packets, and a buffer unit that temporarily stores packets received by the receiving unit. A program that realizes a control function that performs control to transfer the packet received by the buffer unit to the buffer unit, and a content storage function that performs control to store the content decoded from the packet transferred to the buffer unit. The computer stores a table that stores a predetermined threshold and packet identification information in association with each other, and the control function is configured to receive the reception when the buffer amount of the buffer unit is equal to or larger than the predetermined threshold. Among the packets received by the communication unit, packets corresponding to the packet identification information stored in the table are Characterized in that does not transfer to the file unit.

  According to the present invention, when transferring a received packet from a receiving unit that receives a digital broadcast composed of a plurality of packets to a buffer unit for temporarily storing the packet, the predetermined threshold value and the packet identification information When the buffer amount of the buffer unit is greater than or equal to a predetermined threshold value, the packet corresponding to the packet identification information stored in the table is buffered out of the packets received by the receiving unit. Will be transferred to the department. Therefore, since the packet to be transferred is selected according to the buffer amount, it is possible to suppress the risk of overflow of the buffer unit.

It is a figure for demonstrating the whole system in this embodiment. It is a block diagram which shows the function structure of the portable terminal in this embodiment. It is a figure which shows an example of a data structure of the buffer threshold value storage part in 1st Example. It is a figure for demonstrating the operation | movement in 1st Example. It is an operation | movement flow for demonstrating the flow of the process in 1st Example. It is a figure which shows an example of a data structure of the buffer threshold value storage part in 2nd Example. It is a figure for demonstrating the operation | movement in 2nd Example. It is an operation | movement flow for demonstrating the flow of the process in 2nd Example. It is a figure for demonstrating the operation example in this embodiment. It is a figure for demonstrating the conventional operation | movement.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the present embodiment, as an example, a case will be described in which the digital broadcast receiving apparatus according to the present invention is applied to a portable terminal 1 capable of receiving portable one-segment broadcasting.

[1. overall structure]
With reference to FIG. 1, the entire system according to an embodiment of the present invention will be described. The mobile terminal 1 receives broadcast content distributed from the broadcast station 3. In the present embodiment, content is transmitted from the broadcasting station 3 by terrestrial digital broadcasting. And the portable terminal 1 demonstrates the case where one seg broadcasting is received among terrestrial digital broadcasting.

[2. Functional configuration]
Next, the functional configuration of the mobile terminal 1 will be described with reference to FIG. As shown in FIG. 2, the mobile terminal 1 includes a control unit 10, a tuner unit 20, a digital broadcast control unit 30, a recording control unit 40, a packet filter unit 45, a buffer unit 50, and a buffer monitoring unit 55. A storage unit 60, a buffer threshold storage unit 70, an operation unit 80, a display unit 90, and an audio output unit 95.

  The control unit 10 is a functional unit for controlling the entire mobile terminal 1. The control unit 10 implements various functions by reading and executing various programs stored in the storage unit 60, and is configured by, for example, a CPU (Central Process Unit).

  The tuner unit 20 is a functional unit for receiving a broadcast signal from a channel frequency desired by the user. The tuner unit 20 is connected to an antenna 22.

  The antenna 22 is a functional unit for directly receiving a broadcast signal from the broadcast station 3. For example, the mobile terminal 1 may be configured to be built in, or may be configured to be connected to the outside.

  The digital broadcast control unit 30 is a functional unit for decoding content from the broadcast signal received by the tuner unit 20. The content includes a plurality of packets.

  Here, in the case of one-segment broadcasting, the packet includes an audio packet, a video packet, a caption packet, a data broadcast packet, and the like. These packets can be identified based on the packet identification information. In the present embodiment, a case where an identifier (identification information) called PID (Packet ID) is used as an example of packet identification information will be described.

  The recording control unit 40 is a functional unit for controlling recording of terrestrial digital broadcasting (one-segment broadcasting). That is, control is performed to record the received content as recording data 62 in the storage unit 60 at an instruction from the user or at a predetermined time.

  The packet filter unit 45 is a functional unit for outputting necessary packets from the content packets decoded by the digital broadcast control unit 30 to the buffer unit 50. In the present embodiment, a packet to be output (or a packet to be discarded) is specified by the PID, and a necessary packet is output to the buffer unit 50.

  The buffer unit 50 is a functional unit that temporarily stores content before storing recorded data in the storage unit 60 described later. The buffer unit 50 has a predetermined capacity as a storable capacity, and the buffer monitoring unit 55 outputs the storage amount currently in use (or the remaining storage amount of the buffer unit 50). The buffer monitoring unit 55 outputs the storage amount (filling state, remaining state) of the buffer unit 50 to the control unit 10 at a predetermined timing.

  The storage unit 60 is a functional unit that stores various programs necessary for the operation of the mobile terminal 1 and various data. The storage unit 60 is configured by, for example, a semiconductor memory, an HDD (Hard Disk Drive), or the like. In addition to the program, each content (for example, video data, audio data) and the like are stored.

  Here, recording data 62 is stored in the storage unit 60. The recording data 62 can perform so-called recording by storing the content data stored in the buffer unit.

  The buffer threshold storage unit 70 is a functional unit that stores a buffer threshold. As the buffer threshold, the threshold of the buffer unit 50 and the type of content used (or discarded) at that time (for example, PID indicating the type of packet in the present embodiment) are stored in association with each other.

  Here, the buffer unit 50 may store one threshold (buffer threshold) or a plurality of thresholds may be stored. Further, the buffer threshold value may be stored in advance, or may be selected from a plurality of types or arbitrarily set by a user or the like. In addition, the content provider may specify.

  The operation unit 80 is a functional unit for receiving an input of an operation instruction from a user. For example, the user can instruct channel selection operation, recording operation, and the like via the operation unit 80. The operation unit 80 includes hardware keys and software keys using a touch panel or the like. In addition, since it is only necessary for the user to give an operation instruction, other methods such as a voice input method, an external device such as a keyboard and a mouse may be connected, and remote operation via a network (including e-mail) is performed. It may be broken.

  The display unit 90 is a functional unit that displays various types of information or displays video. For example, it is configured by a device such as an LCD or an organic EL display. The audio output unit 95 is a functional unit (for example, a speaker or an earphone) for outputting sound (sound, music, etc.). These devices may be built in the mobile terminal 1 or may be output to an external device. Since the display unit 90 and the audio output unit 95 are configured by conventional devices, detailed descriptions thereof are omitted.

[3. Example]
[3.1 First Example]
Next, the first embodiment will be described. The first embodiment is a case where there is one buffer threshold, and a case where a packet not to be stored is designated will be described. An example of a table stored in the buffer threshold storage unit 70 in the first embodiment is shown in FIG. As shown in FIG. 3, the buffer threshold (for example, “50%”) is stored in association with the corresponding PID (for example, “0x0320, 0x0180, 0x0240”) of the packet that is not to be recorded.

  An outline of the operation of this embodiment will be described with reference to FIG. FIG. 4A is a diagram showing a state of a packet received by the tuner unit 20 (decoded by the digital broadcast control unit 30). Currently, packets of contents of “A (voice)”, “V (video)”, “C (caption)”, and “D (data broadcasting)” are output.

  Each packet is identified by PID. In the case of the present embodiment, when the PID is “0x180”, “Data Broadcast (D)”, “0x240” is “Subtitle (C)”, “0x320” is “Video (V)”, “0x270” "Is identified as a packet of" voice (A) ".

  Here, FIG. 4B is a diagram showing a normal state (that is, when the buffer amount is equal to or smaller than the buffer threshold). The same packet as in FIG. 4A is output via the packet filter unit 45.

  FIG. 4C is a diagram illustrating a state where the buffer amount exceeds the buffer threshold. That is, based on the content stored in the packet threshold storage unit 70, packets with PIDs “0x0320”, “0x0180”, and “0x0240” are discarded. That is, only the packet “A (voice)” is output to the buffer unit 50.

  Here, specific processing in the first embodiment is shown in FIG. First, when one-segment recording is started (step S102), it is determined whether or not one-segment recording is completed (step S104). Here, when the one-segment recording has not ended (step S104; No), the buffer section is monitored, that is, the buffer amount is monitored (step S106).

  When the buffer amount exceeds the buffer threshold value stored in the buffer threshold value storage table 70 (step S108; Yes), the packet filter unit 45 transfers only a specific packet to the buffer unit 50 (step S110). In the case of the present embodiment, a process of discarding the PID packet stored in the buffer threshold storage table 70 is performed.

  If the buffer amount does not exceed the threshold value (step S108; No), the processing is repeatedly executed from step S104. That is, all packets are transferred. Thereby, when the buffer amount exceeds the threshold value, only a specific packet is transferred to the buffer unit 50, and it is possible to avoid the buffer overflow itself.

[3.2 Second Embodiment]
Next, the second embodiment will be described. In the second embodiment, a plurality of threshold values are stored to limit packets stored in stages. Further, in this embodiment, the packet specified by the PID is discarded.

  An example of the packet threshold stored in the packet threshold storage 70 in the second embodiment is shown in FIG. As shown in FIG. 6, the packet threshold values are stored in stages as “50%”, “70%”, and “90%”.

  An outline of the operation of this embodiment will be described with reference to FIG. FIG. 7A is a diagram showing a state of a packet received by the tuner unit 20 (decoded by the digital broadcast control unit 30). Currently, packets of contents “A”, “V”, “C”, and “D” are output.

  Each packet is identified by PID. In the case of the present embodiment, when the PID is “0x180”, “Data Broadcast (D)”, “0x230” is “Subtitle (C)”, “0x320” is “Video (V)”, “0x270” "Is identified as a packet of" voice (A) ".

  Here, FIG. 7B is a diagram showing a normal state (that is, when the buffer amount is equal to or smaller than the packet threshold). The same packet as in FIG. 7A is output via the packet filter unit 45.

  FIG. 7C is a diagram illustrating a state where the buffer amount exceeds the packet threshold “50%”. That is, based on the content stored in the packet threshold storage unit 70, the packet (“D”) with the PID “0x0180” is discarded.

  FIG. 7D is a diagram illustrating a state when the buffer amount exceeds the packet threshold “70%”. That is, based on the content stored in the packet threshold storage unit 70, in addition to the PID “0x0180”, the packet (“C”) with the PID “0x230” is discarded.

  FIG. 7E is a diagram illustrating a state where the buffer amount exceeds the packet threshold “90%”. That is, based on the content stored in the packet threshold storage unit 70, in addition to the PIDs “0x0180” and “0x230”, the packet (“V”) with the PID “0x320” is discarded.

  Here, the specific processing in the second embodiment is shown in FIG. First, when the one-segment recording is started (step S202), it is determined whether or not the one-segment recording is completed (step S204).

  If the one-segment recording has not been completed yet (step S204; No), the degree of filling of the buffer unit 50, the so-called buffer amount, is monitored (step S206). If the buffer amount exceeds the first threshold (step S208; Yes), the packet filter unit 45 associates the packet with PID1 (that is, the buffer threshold storage unit 70 with the first threshold). The packet is controlled not to be transferred to the buffer unit 50 (step S210).

  Subsequently, when the buffer amount exceeds the second threshold value (step S212; Yes), the packet filter unit 45 further associates the PID2 packet (that is, the buffer threshold value storage unit 70 with the second threshold value). The packet is controlled so as not to be transferred to the buffer unit 50 (step S214).

  Subsequently, when the buffer amount exceeds the third threshold (step S216; Yes), the packet filter unit 45 further associates the packet with PID3 (that is, the buffer threshold storage unit 70 with the third threshold). The packet is controlled so as not to be transferred to the buffer unit 50 (step S218).

  If each buffer amount is equal to or less than the respective threshold value, one-segment recording is continuously performed (step S208; No / step S212; No / step S216; No).

  Thereby, when the buffer amount is equal to or smaller than the first threshold value, all packets are transferred to the buffer unit 50, but when the buffer amount exceeds the first threshold value and equal to or smaller than the second threshold value, the packet of PID1 is not transferred. In other words, packets other than the packet of PID 1 are transferred to the buffer unit 50. Furthermore, when the buffer amount exceeds the second threshold and is equal to or smaller than the third threshold, the PID1 and PID2 packets are not transferred to the buffer unit 50. When the buffer amount exceeds the third threshold, the PID1, PID2, and PID3 packets Will not be transferred to the buffer unit 50.

[4. Example of operation]
Next, an operation example in the present embodiment will be described with reference to FIG. FIG. 9 is a diagram illustrating an example of the display screen W <b> 100 of the mobile terminal 1. The threshold value is input to the region R100, and the type of content not recorded (packet type) corresponding to the threshold value is input to the region R102.

  Here, the threshold value and the content type (packet type) may be selected, or an arbitrary number may be input. The threshold value or the like may be one input or a plurality of inputs.

  In the operation example, the name of the content (packet) is displayed as an unrecorded target. The mobile terminal 1 stores the threshold and the PID corresponding to the selected content type (packet type) in the buffer threshold storage unit 70. The PID corresponding to the name of the content (packet) may be set in advance or may be set by the user.

[5. Modified example]
The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the design and the like within the scope of the present invention are also within the scope of the claims. include.

  Note that the digital broadcast receiving apparatus of the above-described embodiment is applicable as long as it can receive digital broadcasts such as a mobile phone including a smartphone, a tablet, a car navigation system, a TV, and a computer.

  In the above-described embodiment, the one-segment broadcasting is described as an example of the received broadcast. However, other methods may be used as long as the content is specified by a packet or the like. For example, it can be used in various broadcasting formats such as terrestrial digital broadcasting (full-segment service), digital satellite broadcasting, and IP multicast broadcasting.

  In addition, the program that operates in each device in the embodiment is a program (a program that causes a computer to function) that controls the CPU and the like so as to realize the functions of the above-described embodiments. Information handled by these devices is temporarily stored in a temporary storage device (for example, RAM) at the time of processing, then stored in various ROM or HDD storage devices, and read and corrected by the CPU as necessary. • Writing is performed.

  In addition, when distributing to the market, the program can be stored and distributed in a portable recording medium, or transferred to a server computer connected via a network such as the Internet. In this case, of course, the storage device of the server computer is also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Mobile terminal 10 Control part 20 Tuner part 22 Antenna 30 Digital broadcast control part 40 Recording control part 45 Packet filter part 50 Buffer part 55 Buffer monitoring part 60 Storage part 62 Recording data 70 Buffer threshold value saving part 80 Operation part 90 Display part 95 Audio | voice Output section

Claims (5)

A receiver for receiving a digital broadcast composed of a plurality of packets;
A control unit that performs control to transfer a packet received by the receiving unit to a buffer unit for temporarily storing the packet;
A storage unit for storing content decoded from the packet transferred to the buffer unit;
With
A table that stores predetermined threshold values and packet identification information in association with each other;
The control unit transfers, to the buffer unit, a packet corresponding to the packet identification information stored in the table among the packets received by the receiving unit when the buffer amount of the buffer unit is equal to or greater than a predetermined threshold value. A digital broadcast receiver characterized by performing control to perform. A receiver for receiving a digital broadcast composed of a plurality of packets;
A control unit that performs control to transfer a packet received by the receiving unit to a buffer unit for temporarily storing the packet;
A storage unit for storing content decoded from the packet transferred to the buffer unit;
With
A table that stores predetermined threshold values and packet identification information in association with each other;
When the buffer amount of the buffer unit is equal to or greater than a predetermined threshold, the control unit sends a packet corresponding to the packet identification information stored in the table to the buffer unit among the packets received by the receiving unit. A digital broadcast receiver characterized in that no transfer is performed. The table stores the first threshold value and the first packet identification information in association with the second threshold value and the second packet identification information,
The controller is
When the buffer amount of the buffer unit is equal to or greater than the first threshold, among the packets received by the receiving unit, the packet corresponding to the first packet identification information stored in the table is not transferred,
Further, when the buffer amount of the buffer unit is equal to or larger than the second threshold, the packet corresponding to the second packet identification information stored in the table is not transferred among the packets received by the receiving unit. The digital broadcast receiver according to claim 2. A computer having a receiving unit for receiving digital broadcasting composed of a plurality of packets, and a buffer unit for temporarily storing packets received by the receiving unit,
A control function for performing control to transfer a packet received by the receiving unit to the buffer unit;
A content storage function for performing control to store the content decoded from the packet transferred to the buffer unit;
A program that realizes
The computer stores a table for storing predetermined threshold values and packet identification information in association with each other,
The control function transfers, to the buffer unit, a packet corresponding to the packet identification information stored in the table among the packets received by the receiving unit when the buffer amount of the buffer unit is equal to or greater than a predetermined threshold value. A program characterized by performing control. A computer having a receiving unit for receiving digital broadcasting composed of a plurality of packets, and a buffer unit for temporarily storing packets received by the receiving unit,
A control function for performing control to transfer a packet received by the receiving unit to the buffer unit;
A content storage function for performing control to store the content decoded from the packet transferred to the buffer unit;
A program that realizes
The computer stores a table for storing predetermined threshold values and packet identification information in association with each other,
When the buffer amount of the buffer unit is equal to or larger than a predetermined threshold, the control function sends a packet corresponding to the packet identification information stored in the table to the buffer unit among the packets received by the receiving unit. A program that performs control without performing transfer.

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