JP6707692B2 - Transmission/reception method - Google Patents

Description

The present invention relates to a transmission/reception method.

In a digital television broadcasting system for advanced BS/advanced broadband CS broadcasting, MPEG4-AAC (Moving Picture Experts Group 4-Advanced Audio Coding) (1ch, 2ch, 5.1ch, 7.1ch, 22.2ch) is used as the Audio Stream profile. And MPEG4-ALS (Moving Picture Experts Group 4-Audio Lossless Coding) (2ch, 5.1ch) are planned to be adopted. As a means for outputting these Audio Streams from the receiving device to an external audio device (including an AV amplifier, a sound bar, etc.), an optical cable/coaxial cable compliant with the S/PDIF (Sony Philips Digital Interface) standard, or an HDMI ( (Registered trademark)-Forum (High-Definition Multimedia Interface-Forum) standardized HDMI cable transmission. In both cases, the signal transmission method is standardized by IEC61937.

However, the bit rate of Audio Stream that can be transmitted by the current S/PDIF standard is up to about 1.5 Mbps, and in the case of MPEG4-AAC, up to 7.1 ch can be transmitted by the current S/PDIF standard. However, with 22.2 ch, the bit rate is insufficient and transmission is impossible. Therefore, we are revising IEC61937 and studying to double the clock frequency during transmission and extend the transmission rate up to approximately 3 Mbps. Furthermore, in the case of 5.1-ch of MPEG4-ALS, the maximum bit rate of the stream is about 7.3 Mbps, so we are studying to support the transmission clock frequency up to 8x speed so that it can be transmitted.

At present, in digital television broadcasting, an HDTV (High Definition Television) video signal having a horizontal pixel count of 1920 or 1440 and a vertical pixel count of 1080 is mainly used, but further high-definition video distribution. Came to be requested. For this reason, standardization has been made for ultra-high-definition television broadcasting by UHDTV (Ultra High Definition Television) of 4K, which has four times as many screen pixels (3840×2160) and 16 times (7680×4320) as compared with HDTV. It is being advanced.

By the way, in the current terrestrial digital television broadcasting, a section format table called CDT (Common Data Table) is applied to the transmission of service logo data such as a logo mark used in a program section. ARIB TR-B14 Version 5.9, Part 1, 5.4, in the CDT method transmission, regarding the section_number field, "sections numbered from 0 to the number indicated by last_section_number exist without exception. In the case of service logo data transmission, , The logo of each size is transmitted in the section of section_number that matches the logo_type value.” This means that when transmitting logo data with a certain logo_type value, all types of logo data from 0 to the logo_type value must be transmitted in 1 section units (1 section per 1 logo) without exception. means.

ARIB STD-B63 1.1 version “Receiver Standard for Advanced Broadband Satellite Digital Broadcasting” Revised March 17, 2015, Japan Radio Industry Association ARIB STD-B60 1.4 version "Established on September 30, 2015 by the MMT Media Transport System Standard for Digital Broadcasting", The Association of Radio Industries and Businesses "Terrestrial Digital Television Broadcasting Operation Regulations" ARIB TR-B14 5.9 version Revised July 3, 2015 First edition

An object of this embodiment is to provide a broadcasting system and a transmitting device and a receiving device thereof that solve the problems that occur in a digital television broadcasting system when performing advanced BS/advanced broadband CS broadcasting.

A transmission/reception method according to an embodiment is performed in a transmission device and a reception device for transmitting logo data indicating a logo by a TLV stream in a section format table CDT (Common Data Table) based on TLV (Type Length Value)/MMT (MPEG Media Transport). It is a transmission/reception method.

In this transmission/reception method,
The logo data for each number of pixels is identified by the logo type,
The content of the logo transmission descriptor arranged in the descriptor area of the service description table transmitted by the TLV stream changes depending on the logo transmission type.
When the logo transmission type of the logo transmission descriptor is 0x01, the logo transmission descriptor is
A logo identification that describes the ID of the logo data defined in the service description table,
A logo version number that describes the version number of the logo identification,
Download data identification, which represents the identification of the data to be downloaded,
Logotype,
A start section number that represents the first section number that transmits the logo data of the logo type in pieces,
The number of transmission sections that represents the number of sections that transmit the logo data of the relevant logotype, and
Including,
When the size of the logo data of one logotype exceeds the size that can be transmitted in one section, the transmitting device allocates the logo data identified by the logotype to the CDT section having continuous section numbers and transmits the CDT section.
The receiving device obtains the logo data based on the start section number and the transmission section number included in the logo transmission descriptor arranged in the descriptor area of the service description table transmitted by the TLV stream. ..

The block diagram which shows the structure of the broadcast receiving apparatus in advanced BS/advanced wideband CS broadcasting which concerns on the process at the time of switching the audio stream of 1st Embodiment. FIG. 3 is a block diagram for explaining switching of audio profiles when the broadcast receiving apparatus shown in FIG. 1 and an AV amplifier are connected. The figure which shows the operation|movement at the time of receiving the broadcast which audio assets (audio mode) change from AAC 2ch to ALS 2ch in the broadcast receiving apparatus and external AV amplifier in a conventional system. The figure which shows the operation|movement at the time of the broadcast which the audio|voice mode changes from MPEG4-AAC 2ch to MPEG4-AAC 5.1ch in the broadcast receiving apparatus and external AV amplifier in a conventional system. The figure which shows the operation|movement at the time of receiving the broadcast which the audio mode changes from MPEG4-AAC 2ch to MPEG4-AAC 22.2ch in the broadcast receiving apparatus and external AV amplifier in a conventional system. The figure which shows the operation|movement at the time of receiving the broadcast which changes from AAC 2ch to AAC 22.2ch, when a profile is a B connection mode in the broadcast receiving apparatus shown in FIG. The figure which shows operation|movement at the time of receiving the broadcast which changes from AAC 2ch to AAC 22.2ch, when a profile is A connection mode in the broadcast receiving apparatus shown in FIG. 3 is a flowchart for explaining pre-mode setting of a profile in the broadcast receiving device shown in FIG. 1. 2 is a flowchart for explaining a switching process at the time of receiving a broadcast in the broadcast receiving device shown in FIG. 1. The block diagram which shows the structure of the transmitter of the digital television broadcasting system which concerns on the logo processing of 1st Embodiment. The figure for demonstrating the area|region which stores the process result of the logo data modularization part of the transmitter shown in FIG. FIG. 11 is a diagram showing a CDT data structure used in a CDT sectioning unit of the transmitting apparatus shown in FIG. 10. The figure which shows the data structure of the logo data distribution descriptor of the transmission apparatus shown in FIG. The block diagram which shows the structure of the receiver of the digital television broadcasting system which concerns on the logo processing of 1st Embodiment. 15 is a flowchart for explaining a processing operation regarding logo data of the receiving device shown in FIG. 14. The block diagram which shows the structure of the transmitter of the digital television broadcasting system of 2nd and 3rd embodiment. The figure which shows the data structure which extended the MH-logo transmission descriptor in the transmitter shown in FIG. The flowchart for demonstrating the process operation of the transmitter of the digital television broadcasting system which concerns on 3rd Embodiment. The figure which shows the data structure regarding data_module_byte of the processing operation shown in FIG. FIG. 19 is a diagram showing another data structure related to data_module_byte of the processing operation shown in FIG. 18.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The transmission/reception device of the embodiment is capable of multiplexing transmission of any number of different types of logo data of different types per logo identification in a plurality of sections of the common data table information with a size exceeding the amount of data that can be transmitted in one section of the common data table information. It is a simple transceiver.

The transmission device of the embodiment is capable of multiplex transmission of an arbitrary number of different types of logo data of different types per logo identification in a plurality of sections of the common data table information with a size exceeding the amount of data that can be transmitted in one section of the common data table information. It is a transmission device used in various transmission/reception systems.

The receiver of the embodiment is capable of multiplex transmission of any number of different types of logo data of different types for one logo identification in a plurality of sections of the common data table information with a size exceeding the amount of data that can be transmitted in one section of the common data table information. It is a receiving device used in various transmission/reception systems.

When the doubling mode and the octupling mode of the transmission clock are defined in the IEC61937, it is possible to manufacture a broadcast receiving device and an audio device capable of transmitting up to MPEG4-ALS 5.1ch according to the standard. However, in order to operate the transmission clock at double speed or octuple speed, it is necessary to adopt a dedicated component or the like, which increases the cost of the product.

Also, considering that most audio is MPEG4-AAC 2ch or 5.1ch in actual broadcasting, up to 1x speed that can support up to 1.5Mbps, which is equivalent to the conventional case, for audio equipment that is cheap in cost. It is desirable to make a distinction such that only high-end models that support MPEG4-AAC 22.2ch or MPEG4-ALS can handle up to 2x or 8x speed. However, when an audio device is connected to the receiving device with an optical cable or a coaxial cable, there is a way for the receiving device to know how many speeds the connected audio device supports (which profile it supports). Absent. Therefore, unless some setting is made by the user operation on the receiving device side, the double speed mode sound is output to an audio device that does not support the double speed mode sound, and there is a problem that no sound is produced during a certain broadcast program. Will occur.

That is, in a broadcast receiving device that receives a broadcast in which the first audio signal and the second audio signal are selectively transmitted and outputs the received audio signal to an externally connected audio device, There are a first transmission clock frequency and a second transmission clock frequency as a transmission clock frequency of the audio signal transmission between the two, and the first audio signal can be transmitted at both the first transmission clock frequency and the second transmission clock frequency. When the second audio signal can be transmitted only at the second transmission clock frequency, the audio signal is output at the second transmission clock frequency to the audio device that does not support the second transmission clock frequency. There is a problem that no sound is produced.

In addition, since a plurality of voice modes are simultaneously transmitted and can be arbitrarily selected on the receiving side, it is desirable to identify and display the voice modes to the user.

According to the embodiment, there are a first transmission clock frequency and a second transmission clock frequency as a transmission clock frequency for audio signal transmission with an externally connected audio device, and the first audio signal is the first transmission clock frequency. A form suitable for the corresponding transmission clock frequency of the connected audio device when the second audio signal can be transmitted at both the frequency and the second transmission clock frequency, and the second audio signal can be transmitted only at the second transmission clock frequency. There is provided a broadcasting system, a broadcasting transmitting device, a broadcasting receiving device, a broadcasting transmitting/receiving method, a broadcasting transmitting method and a broadcasting receiving method, which are capable of outputting a sound signal received by the user and further capable of identifying and displaying a sound mode to a user. It

Further, for example, in the above-described transmission method of logo data in digital television broadcasting, it is not possible to transmit logo data of a size exceeding one section, in other words, a type of a size extending over a plurality of sections, other than 0. There is a problem that it is not possible to select and transmit only logo_type logo data of the required value. Therefore, when the digital television broadcasting is made to have an extremely high definition, the expandability, flexibility, transmission efficiency, etc. of the operation of the logo data are impaired.

According to the embodiment, there is also provided a broadcasting system capable of expanding the operation of logo data and improving flexibility, transmission efficiency, and the like, and a transmitting device and a receiving device thereof when the video has a high definition.

(First embodiment)
Hereinafter, a transmission device, a reception device, a transmission/reception device, and a method thereof according to the first embodiment will be described with reference to FIGS. 1 to 15.

The first embodiment is roughly divided into a process when the audio stream is switched and a part related to the logo process. However, the present invention does not necessarily require both processes, and either process is performed. The invention alone can be an invention.

(First Embodiment Processing of Receiving Device when Audio Stream is Switched)
First, the processing when the audio streams of the first embodiment are switched will be described.

Hereinafter, with reference to FIG. 1 to FIG. 9, the processing of the receiving device and the method when the audio stream is switched will be described.

FIG. 1 is a block diagram showing a configuration of a broadcast receiving device 1 in advanced BS/advanced broadband CS broadcasting as a first embodiment. This broadcast receiving apparatus receives a broadcast wave reception signal obtained by a reception antenna (not shown), and performs a demodulation process and an error correction decoding process in a transmission path demodulation/decoding unit 11 to obtain a TLV stream and obtain this TLV stream. The TLV/MMT separation unit 12 separates the video stream and the audio stream from the stream.

The TLV/MMT separation unit 12 separates a TLV (Type Length Value) packet and an MMT (MPEG Media Transport) packet from the audio stream and sends them to the audio selection control unit 13. The audio selection control unit 13 selects one asset suitable for the AV amplifier 2 of the output destination from a plurality of audio assets based on the TLV information of the TLV packet and the MMT information of the MMT packet, and selects the asset as an internal reproduction system. Output to each external output system.

In the internal reproduction system, the decoder 14 decodes the selected audio asset, and if the decoded output is 5.1 ch PCM data, the down mixer (DMIX) unit 15 converts it to 2 ch PCM data and sends it to the switching unit 16. If it is PCM data of 2ch, it is directly sent to the switching unit 16. Based on an instruction from the audio selection control unit 13, the switching unit 16 selects either 2ch from the downmixer unit 15 or 2ch directly supplied from the decoder 14 at the input, and at the output, an internal reproduction system or an external device. Select one of the output systems.

The 2ch PCM data selectively output to the internal reproduction system by the switching unit 16 is converted into an analog audio signal by a DAC (Digital-Analog Converter) 17, and sent to the audio output unit 18 by an internal amplifier and a speaker to reproduce sound. To be done. The 2ch PCM data selectively output to the external output system is sent to the external output interface (I/F) 19. The external output interface 19 includes an HDMI output terminal, an S/PDIF optical digital audio output terminal, and an S/PDIF coaxial digital audio output terminal, and an external AV amplifier 2 and an HDMI cable, an S/PDIF optical digital cable, and an S/PDIF optical digital cable, respectively. It can be connected by a PDIF coaxial digital cable and outputs the audio asset selected by the audio selection control unit 13 to the externally connected AV amplifier 2. When the corresponding audio mode information of the externally connected AV amplifier 2 is not obtained, the 2ch PCM data from the switching unit 16 is selected and output to the AV amplifier 2.

Here, when the corresponding audio mode information is obtained when the AV amplifier 2 is connected, the external output interface 19 sends the information to the audio selection control unit 13. When the corresponding audio mode information of the connected AV amplifier 2 is obtained from the external output interface 18, the audio selection control unit 13 registers the information, and when the audio asset of the corresponding audio mode arrives. , Switch settings to output the audio asset.

On the other hand, the video stream obtained by the transmission path demodulation/decoding unit 11 is sent to the video processing unit 1A. The video processing unit 1A generates a video signal of a predetermined resolution from the input video stream and sends it to the display device 3 for display. Here, when the corresponding audio mode of the connected AV amplifier 2 cannot be registered and set, the audio selection control unit 13 displays a display on the GUI (Graphical User Interface) display unit 1B to prompt an input operation for mode selection. Send instructions to do so. Upon receiving the instruction, the GUI display unit 1B causes the display device 3 to display an input operation screen for mode selection through the video processing unit 1A. When the user sees the screen and operates the operation input unit 1C to select the corresponding audio mode of the AV amplifier 2, the audio selection control unit 13 registers and sets the corresponding audio mode of the connected AV amplifier 2. be able to.

FIG. 2 is a conceptual diagram for explaining a process of connecting an external AV amplifier 2 to the broadcast receiving device 1 and transmitting an audio asset. In FIG. 2, the receiver 1 and the external AV amplifier 2 are connected by any one of an HDMI cable, an S/PDIF optical digital cable, and an S/PDIF coaxial digital cable.

First, when the receiving device 1 is in the form of a set top box (STB), the HDMI output terminal of the receiving device 1 and the HDMI input terminal of the external AV amplifier 2 are connected by an HDMI cable. As a result, the audio signal is transmitted from the receiving device 1 to the external AV amplifier 2 together with the video signal. On the other hand, when the receiving device 1 is in the form of a television, it is connected to the HDMI output terminal of the external AV amplifier 2 for the purpose of inputting the video/audio signals reproduced by the external AV amplifier 2 to the receiving device (TV) 1. The HDMI input terminal of the receiving device (TV) 1 is connected by an HDMI cable. In this case, by using the function (HDMI-ARC: Audio Return Channel) of transmitting only the audio signal from the receiving device (TV) 1 to the external AV amplifier 2 on the HDMI cable, the audio of the receiving device (TV) The signal can be transmitted to the external AV amplifier 2. The television-type receiving device 1 may be provided with an HDMI output terminal and may be provided with a function of transmitting a video/audio signal to the HDMI input terminal of the external AV amplifier 2.

In the case of the connection using the S/PDIF optical digital cable or the S/PDIF coaxial digital cable, the digital audio output terminal of the receiving device 1 and the optical or coaxial digital audio input terminal of the external AV amplifier 2 are connected.

Here, in any connection of HDMI, HDMI-ARC, and S/PDIF, the audio output from the receiving device 1 to the external AV amplifier 2 is only one audio asset. When receiving a broadcast including a plurality of audio assets, the receiving device 1 selects and outputs one audio asset to be output to the external AV amplifier 2.

The connection with the external AV amplifier 2 and the processing required in the receiving device 1 will be described below.

As shown in FIG. 2, the receiving device 1 receives a broadcast wave (TLV stream) including a plurality of audio streams (maximum audio asset number 4). For example, in advanced broadband CS broadcasting, 7 kinds of audio modes can be operated (note that in advanced BS digital broadcasting, AAC 1.0ch is not used, and therefore 6 kinds). Of these, when broadcasting other audio modes than AAC 1.0ch (not operated in advanced BS), AAC 2.0ch, and AAC 5.1ch, which the receiver 1 is required to reproduce independently, Audio is broadcast at the same time. Table 1 shows an example of a combination of audio modes and simul audio in broadcasting.

The receiving device 1 selects one asset to be output from such a plurality of audio assets and outputs it to the external AV amplifier 2. The asset to be output may be arbitrarily selected by the user, or may be automatically selected when the audio mode compatible with the external AV amplifier 2 is known (set in advance on the receiving device 1 side). In this case, the asset with a small component tag value is prioritized as in the case of the reproduction on the main body of the receiving device 1. Further, a function of decoding the audio stream in the receiving device 1 and outputting it to the external AV amplifier 2 by the linear PCM may be provided.

The audio modes to be output to the outside are a combination according to the support status of the output destination device.

The audio mode and switching operation in stream output will be described.

First, the stream output method to S/PDIF and HDMI is defined by IEC60958 and IEC61937. When outputting each audio mode used in advanced BS broadcasting and advanced broadband CS broadcasting, they are output according to the regulations of Table 2.

When transmitting AAC 22.2 ch and ALS audio, the bit rate of the signal exceeds the range that can be transmitted at the IEC60958 frame rate of 48 kHz, so it is necessary to expand the frame rate to double speed or more. Currently, we are preparing to revise the standards of IEC60958 and IEC61937 corresponding to this.

As an operation example when outputting a broadcast whose audio mode changes to the external AV amplifier 2, the receiving apparatus 1 and the external AV amplifier 2 when receiving a broadcast whose audio mode changes from MPEG4-AAC 2ch to MPEG4-ALS 2ch The operation of is shown in FIG.

The receiving device 1 receives the AAC 2ch asset that is the preceding voice (FIG. 3A) and outputs it to the S/PDIF at a frame rate of 48 kHz (FIG. 3B). The external AV amplifier 2 receives this stream, decodes it, and outputs it to the speaker (FIG. 3(c)). When the preceding audio asset of the broadcast stops in this state (Fig. 3(a)), the receiving device 1 outputs a NULL data stream to S/PDIF for 50 msec or more according to IEC60958-1 (Fig. 3(b)), and then S /Stops output to PDIF. With this NULL data stream, the external AV amplifier 2 discharges the audio stream accumulated in the buffer.

When the receiving apparatus 1 receives the ALS 2ch asset which is the subsequent audio (FIG. 3A), the receiving apparatus 1 changes the S/PDIF frame rate to 96 kHz and outputs the ALS 2ch stream (see FIG. b)). The external AV amplifier 2 that has received such a stream that changes on the S/PDIF performs resynchronization processing by the PLL circuit with respect to the change in the frame rate. After that, the format of the audio stream is detected, the audio decoder is switched from AAC to ALS, and the subsequent audio is output from the speaker after the delay time of ALS decoding (FIG. 3C).

Further, in FIGS. 4 and 5, in the advanced BS/advanced broadband CS digital broadcasting, when a stream in which the audio mode changes is broadcast, the change in the audio mode in the broadcast signal and the S/PDIF from the receiving apparatus 1 are shown. 2 shows the relationship between the signal output from the AV amplifier 2 and the audio data output from the AV amplifier 2.

FIG. 4 shows the relationship when the audio mode is changed from MPEG4-AAC 2ch to MPEG4-AAC 5.1ch. Receiving apparatus 1 that has received AAC 2ch from the broadcast signal outputs the AAC 2ch audio stream to S/PDIF with a transmission clock of 48 kHz (1× speed). Also, in broadcasting, an MPT for notifying the change of the audio mode is transmitted about 100 msec before the audio mode changes.

When the receiving device 1 looks at the contents of the MPT and finds that the audio changes from AAC 2ch to 5.1ch, it stops outputting the audio stream to the S/PDIF. However, the succeeding audio is 5.1ch, and it is known that the same 48kHz transmission clock can be sent, so the transmission clock continues to be output. After that, when the subsequent AAC 5.1ch audio stream is received, the stream is output to S/PDIF.

The AV amplifier 2 which receives the signal from the S/PDIF outputs the AAC 2ch sound to the speaker while the AAC 2ch sound is being input, and stops the audio output when the no sound section is entered. Next, when an audio signal is input, a process of detecting what the audio is is performed, and when it is determined that the AAC 5.1ch is output, it is output to the speaker.

On the other hand, FIG. 5 shows the case where the audio mode changes from MPEG4-AAC 2ch to MPEG4-AAC 22.2ch. The difference from the case of FIG. 4 is that MPEG4-AAC 22.2ch cannot transmit at a bit rate when the S/PDIF transmission clock is 48 kHz, and it is necessary to switch the transmission clock to 96 kHz (double speed). ..

Receiving the change in the audio mode by updating the MPT, the receiving device 1 stops the AAC 2ch audio output of S/PDIF when it knows that the following audio is MPEG4-AAC 22.2ch that requires transmission at 96kHz. After that, the output of the transmission clock of 48 kHz is also stopped. After that, the audioless data of the transmission clock of 96 kHz is output to S/PDIF, and when the 22.2 ch audio stream is received, the audio is output to S/PDIF.

The AV amplifier 2 receiving the signal from the S/PDIF receives the signal of the 96 kHz transmission clock after the AAC 2ch 48 kHz signal is cut off, and then synchronizes with the receiving device 1 at the frequency of 96 kHz by the PLL. I do. After the time required for this synchronization (about 200 msec) has elapsed, the audio signal is received and the sound is output to the speaker after understanding that it is AAC 22.2 ch. In this way, when the audio mode changes with different transmission clocks occur, there is a problem that the time required for sound output becomes long. As shown in FIG. 3, when switching the audio mode from MPEG4-AAC 2ch to MPEG4-ALS, since the transmission clock frequency is different, the same problem occurs.

As described in the subject, the audio mode is expanded in advanced BS broadcasting. As a result, there is an audio mode in which the transmission rate is insufficient at the transmission clock frequency defined by the conventional S/PDIF standard and transmission cannot be performed. Therefore, the S/PDIF standard is being revised to expand the S/PDIF standard and enable high-speed transmission. Table 3 shows the relationship between the audio mode and the transmission clock frequency in S/PDIF.

As an AV amplifier (including a device such as a sound bar) 2 compatible with advanced BS broadcasting, it is not necessary to receive and output all audio modes defined in the standard as shown in Table 3, AAC 1ch/2ch It is possible to commercialize products that support only /5.1ch. In this case, the S/PDIF transmission clock frequency only needs to be compatible with 48 kHz.

On the other hand, when the AV amplifier 2 is compatible with MPEG4-AAC 22.2 ch, the S/PDIF transmission clock frequency is compatible with both 48 kHz and 96 kHz. When the AV amplifier 2 supports up to MPEG4-ALS 5.1ch, it is necessary to further support a transmission clock frequency of 384 kHz.

In order to convey these distinctions to general consumers in an easy-to-understand manner, in this embodiment, AV amplifier products are classified into three profiles as shown in Table 4.

On the other hand, the broadcasting station switches the audio mode of the audio stream during broadcasting and sends it. For example, the main program is transmitted in MPEG4-AAC 5.1ch and the CM part is transmitted in MPEG4-AAC 2ch.

In advanced BS broadcasting, when such an audio stream is switched, the MPT is updated 100 msec before the switching to notify the receiving device 1 in advance that the audio stream will be switched.

When the receiving device (TV) 1 that has received such a broadcast outputs sound from the built-in speaker, if the switching of the audio mode is known in advance by MPT update, the receiving device (TV) 1 first outputs the preceding side audio. Is muted to prepare for switching, the decoder mode is changed according to the audio mode of the subsequent audio stream, and when the subsequent audio is received, the subsequent audio is output to the speaker.

On the other hand, when the audio stream is output from the receiving device (TV) 1 to the AV amplifier 2 and is output to the speaker via the AV amplifier 2, the receiving device (TV) 1 first outputs the preceding audio (as shown in FIG. 4). MPEG4-AAC 2ch) is output to S/PDIF. When the switching of the audio mode is detected by the MPT update, the output of the preceding audio to S/PDIF is stopped. However, the S/PDIF transmission clock continues to be output at 48 kHz. Upon receiving the subsequent audio (MPEG4-AAC 5.1ch), the receiving device (TV) 1 outputs the subsequent audio stream to the S/PDIF.

Here, the S/PDIF has no means for transmitting information other than the audio stream from the receiving device (TV) 1 to the AV amplifier 2. Therefore, the AV amplifier 2 checks the content of the received audio stream each time the audio mode is switched, and detects the change from AAC 2ch to AAC 5.1ch. For this reason, the subsequent sound is output from the speaker with a delay of a certain time from the point where the stream on S/PDIF is changed to AAC 5.1ch. This time is a time for the AV amplifier 2 to detect the audio mode switching.

The above example describes the case where the change from MPEG4-AAC 2ch to MPEG4-AAC 5.1ch is made within the range of the audio mode in which the S/PDIF transmission clock frequency is 48kHz. .. FIG. 5 shows audio mode switching that requires switching from MPEG4-AAC 2ch to MPEG4-AAC 22.2ch to different transmission clock frequencies.

When receiving the audio of MPEG4-AAC 2ch which is the preceding audio, the receiving device (TV) 1 transmits the stream of AAC 2ch at the transmission clock frequency of 48 kHz when outputting the audio stream to S/PDIF. The receiving device (TV) 1 which has grasped that the following audio is MPEG4-AAC 22.2 ch by updating the MPT, first stops the transmission of the preceding audio. Next, since the subsequent voice is in a voice mode in which it cannot be transmitted unless it is a clock of 96 kHz, the transmission clock of 48 kHz is also stopped, and subsequently the transmission clock of 96 kHz is output. After that, when the subsequent audio is received, the MPEG4-AAC 22.2 ch audio stream is transmitted at the 96 kHz clock.

On the other hand, from the viewpoint of the AV amplifier 2 side that receives this audio stream, the audio stream is first stopped while the preceding audio of MPEG4-AAC 2ch 48 kHz is being output, and then the transmission clock of 48 kHz is also stopped. Subsequently, a 96 kHz transmission clock is input via S/PDIF. Since the frequency of the transmission clock for communication has changed, the PLL circuit synchronizes the transmission clocks of the receiving device (TV) 1 and the AV amplifier 2.

When the communication path between the receiving device (TV) 1 and the AV amplifier 2 is synchronized, the audio stream can be received again via S/PDIF, the audio mode of the received audio stream is detected, and the audio stream is sent to the speaker. Is performed. It is assumed that the time required for the synchronization processing by the PLL (PLL lock time) is about 200 msec, which is a relatively long time. Therefore, there is a problem that the beginning portion of the subsequent voice is missing.

To avoid this problem, the receiving apparatus (TV) 1 belongs to which profile in Table 4 which transmission clock frequency the AV amplifier 2 connected to the receiving apparatus (TV) 1 can handle. Whether or not the AV amplifier is connected is stored as a profile connection mode.

When an HDMI cable is used for the connection between the receiving device (TV) 1 and the AV amplifier 2, the HDMI EDID (Extended Display Identificaiton Data) or HDMI-CEC (High Definition Multimedia Interface-Consumer Electronics Control) is used. The receiving device (TV) 1 determines which profile the AV amplifier 2 belongs to based on the information that can be acquired, and stores the connection mode of the profile. For example, when an AV amplifier capable of supporting only MPEG2-AAC 2ch/5.1ch is connected, the receiving device (TV) 1 stores and sets "Profile-A connection mode". When an AV amplifier capable of supporting MPEG2-AAC 2ch/5.1ch/22.2ch is connected, the receiving device (TV) 1 stores and sets the "Profile-B connection mode".

On the other hand, when the connection between the receiving device (TV) 1 and the AV amplifier 2 is the S/PDIF optical cable or the coaxial cable, the receiving device (TV) 1 cannot acquire the information about the AV amplifier 2. Therefore, the GUI of the receiving device (TV) 1 is used to create a menu for inputting the “profile of the connected AV amplifier” and prompt the user to input it.

By providing the receiving device (TV) 1 with a function of storing and setting the “profile connection mode” indicating which profile the AV amplifier 2 connected to the receiving device (TV) 1 belongs to, the receiving device (TV) 1 The audio streams output from S to PDIF are as shown in FIGS. 6 and 7 show signals output from the receiving apparatus (TV) 1 to S/PDIF for each mode when receiving a broadcast in which the audio stream changes from MPEG4-AAC 2ch to MPEG4-AAC 22.2ch. It is a figure.

FIG. 6 is a diagram when a Profile-B AV amplifier capable of handling AAC 22.2 ch is connected. When outputting the MPEG4-AAC 2ch audio to S/PDIF, the receiving device (TV) 1 set to "Profile-B connection mode" dares to use 96kHz even if it is the AAC 2ch stream that is originally in time for 48kHz. To output to S/PDIF. After that, even if audio switching to MPEG4-AAC 22.2ch occurs, it becomes possible to switch only the audio stream while keeping the transmission clock at 96 kHz. As a result, the PLL lock time as shown in FIG. 5 becomes unnecessary, and the head loss of the sound at the switching point from AAC 2ch to 22.2ch can be reduced.

On the other hand, FIG. 7 is a diagram when a Profile-A AV amplifier, which cannot handle MPEG4-AAC 22.2 ch, is connected. The receiving device (TV) 1 set to the "Profile-A connection mode" outputs the MPEG4-AAC 2ch sound to the S/PDIF, and cannot output a clock other than 48kHz to the AV amplifier of the Profile-A. Since it is an output, the transmission clock of S/PDIF is set to 48 kHz and output.

In the case of advanced BS broadcasting, the only audio decoder that the receiving device must have is MPEG4-AAC 1ch/2ch/5.1ch, and the others are optional. Therefore, when broadcasting audio of AAC 22.2ch or MPEG4-ALS, audio of AAC 2ch or 5.1ch is always broadcast as simulcast.

Profile-A AV amplifier cannot handle AAC 22.2ch audio. For this reason, the receiving device (TV) 1 which has been aware that the MPT update causes audio switching to MPEG4-AAC 22.2ch will generate AAC 2ch or 5.1ch simulcast audio that can be handled by the Profile-A AV amplifier. It searches from the broadcast signal and outputs the audio to S/PDIF with the transmission clock of 48 kHz. In this case, since the AV amplifier 2 receives a stream in which the mode does not change, that is, MPEG4-AAC 2ch for both the preceding voice and the subsequent voice, the succeeding voice can be output without requiring the audio mode detection time.

Thus, when the connection between the receiving device (TV) 1 and the AV amplifier 2 is the S/PDIF optical cable or the coaxial cable, the receiving device (TV) 1 preliminarily determines the audio mode that can be received by the AV amplifier 2. Although it cannot be automatically grasped, it is necessary to output the stream that can reproduce the sound to the AV amplifier 2 by registering the “Profile-A connection mode” in the user in advance with the GUI. You can

MPEG4-AAC 22.2ch of this embodiment can be read as MPEG4-ALS 2ch. When handling MPEG4-ALS 5.1ch, a third profile and mode called Profile-C will be added.

The above control processing is performed by the voice selection control unit 13 shown in FIG. A concrete processing procedure in the voice selection control unit 13 is shown in FIGS. 8 and 9.

FIG. 8 is a flowchart showing the procedure of the voice mode registration setting process. First, in the connection of the external AV amplifier 2, it is judged whether or not it is a connection by an HDMI cable (step S1), and if it is not HDMI connection (NO), the GUI display (step S2) is made to the user to select the profiles A to C. Is performed (step S3), and the selected profile is registered and set (step S4).

In step S1, if HDMI connection is made (YES), it is determined whether EDID is available through the HDMI cable (step S5). If EDID is available (YES), EDID is obtained (step S6). From the obtained EDID, the physical address of the device is specified to determine a compatible profile (step S7), and the process proceeds to step S4 to register and set the profile.

If the EDID is not obtained in step S5 (NO), the HDMI-CEC command is obtained (step S8), and a compatible profile is discriminated from the HDMI-CEC command (step S9), and the process proceeds to step S4. Migrate and register and set the profile.

FIG. 9 is a flow chart showing the procedure of processing after the voice mode registration setting is made at the time of S/PDIF connection as an example. First, when MPT is detected during reception of an audio stream (steps S11 and S12), the registered profile of the AV amplifier 2 is determined (step S13), and if the profile connection mode is A, the clock speed is set to 48 kHz (step S14). ), if B, the clock speed is set to 96 kHz (step S15), and if C, the clock speed is set to 384 kHz (step S16).

Here, it is determined whether or not the double speed mode (96 kHz, 384 kHz) is selected in the clock setting (step S17), and if it is not the double speed mode, it is converted to the 1×48 kHz audio mode (step S18). To the S/PDIF in the corresponding audio mode (step S19).

As described above, in the processing of the receiving device when the audio stream is switched in the broadcast receiving device according to the first embodiment, when the voices in the non-double speed mode and the double speed mode are mixed and broadcast, the connected If the audio device does not support the voice mode of the profile of the double speed mode, it can be converted into the voice of the non-double speed mode and output when switching to the voice of the double speed mode.

Further, when the connected audio device also supports the double speed mode, the audio mode of the corresponding profile is grasped in advance and the clock is set not to be changed before and after the audio mode switching. The head loss of the output voice can be extremely reduced.

Further, even when it is not possible to know in advance the audio mode support status in the AV amplifier, the user can select the audio to be output by designating and inputting the mode through the GUI.

Next, a part related to the logo processing of the first embodiment will be described.

In the logo processing in the transmission device, the reception device, and the transmission/reception device according to the first embodiment, first, for ease of understanding, description will be given using a CDT based on MPEG-2 TS adopted in the current terrestrial broadcasting and the like. To do.

In the case of applying to MH-CDT based on TLV (Type Length Value)/MMT (MPEG Media Transport) which is expected to be adopted in future advanced BS, which is compatible with FIG. It will be described later in the processing.

(Processing of logo in the first embodiment)
Hereinafter, a transmission device, a reception device, a transmission/reception device, and a method thereof for processing a logo will be described with reference to FIGS. 10 to 15.

FIG. 10 is a block diagram showing the configuration of the transmitter of the digital television broadcasting system according to the present embodiment. This transmitter inputs, for example, logo data used in a program display section such as an EPG (Electronic Program Guide) and logo management information for managing the logo of this logo data, and the logo data modularization unit 101 and the CDT, respectively. After passing through the sectioning unit 102, the logo data distribution descriptor generating unit 103, the logo transmission descriptor generating unit 104, and the SDT (Service Definition Table) sectioning unit 105, the multiplexing unit 106 transmits a video signal or an audio signal, PSI (Program Specific Information) and SI (Service Information) other than CDT and SDT are multiplexed together as MPEG-2 TS (Transport Stream) (hereinafter, TS) to perform transmission path coding such as error correction coding and modulation. After being applied by the transmission path coding/modulation unit 107, it is transmitted to the service area as a broadcast signal.

In the present invention, the transmission channel coding/modulation unit 107 is provided after the multiplexing process as a configuration example of a transmission device for general digital broadcasting. As for conversion, transmission line coding may be performed as necessary in IP transmission.

Here, in the transmission method of service logo data for digital television broadcasting, a section type table called CDT (Common Data Table) is used in accordance with the specifications of ARIB TR-B14, 5.4.1.2, and the logo type ( Logo_type) and the logo management information indicating the correspondence between the sections to be transmitted are defined as a new descriptor and transmitted with the logo data.

Usually, the logo used for broadcasting is different for each broadcasting channel (service). Therefore, each logo data is given a logo identification (hereinafter, logo_id) for identification and management by the receiver. In addition, the same logo_id is given to logo data of multiple types of sizes that have the same design and color, but the number of pixels etc. differs depending on the assumed receiver, its application, difference in audio mode, etc. It is distinguished by the logo type (hereinafter logo_type). Also, the logo_id is updated and managed by a version number (hereinafter, logo_version).

The transmitted logo data is sent to the logo data modularization unit 101 together with logo_id, logo_type, and logo_version which are logo management information. This logo data modularization unit 101 compresses the input logo data, and for each logo_id and logo_type, the data structure defined by FIG. 11 (referenced from Table 5-15 in 5.4.1.2 of ARIB TR-B14 5.9 version 5.4.1.2) is used. Store in the area called the logo data module. This logo data module has a data_size field of 16 bits, but cannot store 64 kbytes of data in the CDT section.

Each information in FIG. 11 is defined as follows in ARIB TR-B14 5.9 version 5.4.1.2 Table 5-15.

“Logo_type: Indicates the type of logo. Refer to Table 4-1 for logo_type. This value is transmitted in accordance with the section_number value of CDT.

logo_id: A value to identify the logo data in the receiver, unique for each network_id.

logo_version (logo version number): Enter the version number of the relevant logo_id. This value matches the value of logo_version described in the logo transmission descriptor described in SDT.

data_size (logo data size): Indicates the number of bytes of subsequent logo data. 0 may be entered because the logo_id is no longer used.

data_byte (logo data): The data body of the logo data. ”
The logo data module in which the compressed input logo data is stored is sent from the logo data module conversion unit 101 to the CDT section conversion unit 102. The CDT sectioning section 102 distributes the logo data module to a plurality of sections of the CDT and transmits it to the multiplexing section 106. Here, the CDT has a data structure as shown in FIG. 12 (quoted from Table 5-14 in 5.4.1.2 of ARIB TR-B14). The CDT is identified for each download data identification (hereinafter, download_data_id). One section of the CDT has a maximum size of 4 kbytes indicated by the section_length field, and the CDT can be divided into up to 256 sections for transmission.

The information in FIG. 12 is defined as follows in ARIB TR-B14 5.9 version 5.4.1.2, Table 5-14.

“Table_id: Enter 0xC8.

section_syntax_indicator (section syntax instruction): 1 is described.

section_length (section length): Specifies the number of bytes of the section from immediately after the section length field to the end of the section including CRC. The maximum section length of CDT is 4096 bytes, and this value must not exceed 4093.

download_data_id (Download data identification): Used to identify the download data being transmitted. Download data identification is unique for each original network identification (original_network_id). In the case of a service logo, this value matches the value of download_data_id described in the logo transmission descriptor described in SDT.

version_number (version number): The version number of the sub-table is incremented by 1 each time the content changes, and returns to 0 after 31.

current_next_indicator (current next instruction): 1 is described.

section_number (section number): Describes the section number, and sections from 0 to the number displayed by last_section_number exist without omission. In the case of service logo data transmission, the logo of each size is transmitted in the section of section_number that matches the logo_type value.

last_section_number (last section number): represents the last section number to which the section belongs.

original_network_id (original network identification): Describe the network ID of the transmission source of the transmitted data.

data_type: Indicates the type of data being transmitted. For terrestrial digital television broadcasting, only the CDT transmission system service logo will be operated for the time being.

descriptors_loop_length (descriptor length): Describe the data length of the descriptor loop immediately after. If there is no data in the descriptor loop, enter 0.

data_module_byte() (data module byte): Download data is described by the syntax defined for each data_type. ”
The logo management information logo_id, logo_type, and logo_version are also sent to the logo data distribution descriptor generation unit 103 and the logo transmission descriptor generation unit 104. The logo data distribution descriptor generation unit 103 generates a logo data distribution descriptor indicating the correspondence between the logo_type and the distributed CDT section for each logo data, and sends the logo data distribution descriptor to the CDT section conversion unit 102, and the CDT descriptor area. To place. Further, in the logo transmission descriptor generation unit 104, 0x01 is set when the CDT transmission method 1 is separately specified in the logo transmission type (logo_transmission_type), and the logo data of the logo identification (logo_id) or the logo version number (logo_version) is set. A logo transmission descriptor is generated by adding download data identification (download_data_id) together with management information. By setting the same value for download_data_id as the download_data_id of CDT, it becomes possible to specify the logo data of CDT transmission corresponding to a certain broadcast channel (service). The SDT sectioning unit 105 arranges a logo transmission descriptor in the descriptor area of the SDT for each service_id that specifies a broadcast channel, transmits the logo transmission descriptor to the multiplexing unit 106, and TS multiplexes it together with the CDT section data.

If the size of the data for each logo_type stored in the logo data module is within the size of one section of 4 kbytes, one section can be used for transmission. However, in the case of transmitting logo data having a large number of pixels such as 4K and 8K broadcasting, there is a possibility of exceeding 4 kbytes. Also, in ultra-high definition digital broadcasting, if you do not use the logo_type with a small number of pixels among the logo_type used in terrestrial digital broadcasting, you want to select only the logo of a somewhat large type and transmit it in any order Can also be considered. For these reasons, the “logo of each size”, which was determined by the operational regulations for digital terrestrial broadcasting, is transmitted as is in the section of section_number that matches the “logo_type” value. Cannot be used. Therefore, in the present embodiment, the logo data distribution descriptor is defined so that CDT can be transmitted even in such a case. The data structure of this logo data distribution descriptor is as shown in FIG. 13, for example.

The logo data module identified by logo_type shall be divided into CDT sections with consecutive section numbers for transmission, and the first section number shall be entered in the start_section_number field to indicate the number of section divisions for transmitting the logo data module. Describe in the numbers_of_sections field. For example, let's say that two types of logo_type logo data are transmitted, 1000 bytes of logo_type=0x05 logo data is section number 0, and logo_type of 10000byte logo data is 0x06, and 4000byte, 4000byte, and 2000byte are divided into 3 sections. It is divided and transmitted in order from section number 1.

in this case,
logo_type=0x05, start_section_number=0x00, numbers_of_sections=0x01
logo_type=0x06, start_section_number=0x01, numbers_of_sections=0x03
Can be described as

Then, this logo data distribution descriptor is arranged in the descriptor area of the CDT and transmitted. The transmission system of these series of logo data is as shown in FIG.

On the other hand, when the corresponding broadcast receiving apparatus detects that the logo transmission descriptor is arranged in the descriptor area of the SDT for the logo data of the desired broadcast channel (service), the CDT of the service is detected. It is determined that the data has been transmitted, and the designated download_data_id is referred to, and first, the relevant CDT section is acquired. In this way, by analyzing the logo data distribution descriptor described in the acquired CDT section, it is possible to understand which logo_type logo data is transmitted in which section number section (group). Then, by setting the next required logo_type section number to be filtered, it is possible to efficiently acquire the logo data.

Next, the configuration of the broadcast receiving device will be described. FIG. 14 is a block diagram showing the configuration of the broadcast receiving device 1a according to the first embodiment. As shown in FIG. 14, the broadcast receiving device 1a includes a transmission path demodulation/decoding unit 201, a module I/F unit 202, a section processing unit 203, a TS processing unit 204, a video decoding unit 205, an audio decoding unit 206, and an OSD process. Unit 207 (OSD: On-Screen Display), communication I/F unit 208, operation unit 209, NVRAM 210 (NVRAM: Non-Volatile RAM), ROM 211 (ROM: Read Only Memory), RAM 212 (RAM: Random Access Memory), A CPU 213 (CPU: Central Processing Unit), a descrambler 214, and a storage unit 215 are provided, and each unit is connected by a bus 216.

The transmission path demodulation/decoding unit 201 performs demodulation processing or error correction decoding processing on a broadcast signal received from a reception antenna (not shown) to obtain a transport stream TS. The TS processing unit 204 performs a process of separating the packet-multiplexed information as the transport stream TS and extracting a video signal and an audio signal. Also, the section processing unit 203 cooperates with the TS processing unit 204 to extract PSI (Program Specific Information) and SI (Service Information) demultiplexed from the transport stream TS, and further related information in section format such as CDT. Perform processing. For example, by setting a filtering condition, it is also possible to extract only a section having a specific section number from EIT, CDT, etc. which are generally composed of a plurality of sections.

The video decoding unit 205 decodes the video signal output from the TS processing unit 204 and outputs the decoded video signal to the OSD processing unit 207. The audio processing unit 206 corresponds to the audio selection control unit 13, the decoder 14, the DMIX unit 15, the switching unit 16, the DAC 17, the audio output unit 18, the external output interface 19, and the GUI display unit 1B shown in FIG. The audio signal (audio stream) output from the TS processing unit 204 is decoded, and the decoded audio signal is output to the audio output unit 18 inside the receiving apparatus or to the external AV amplifier 2. The AV amplifier 2 is an audio device including an amplifier and a speaker, and performs audio reproduction according to the audio signal output from the audio processing unit 206. Under the control of the CPU 213, the OSD processing unit 207 performs predetermined OSD processing on the video signal output from the video decoding unit 205, for example, GUI display processing from the audio processing unit 206, and outputs it to the display device 3. The display device 3 is an LCD (Liquid Crystal Display) or the like, and displays a screen based on the output video signal. For example, the display device 3 displays a screen such as an EPG based on the SDT described in the broadcast channel information and the EIT described in the program information included in the SI separated from the multiplexed transport stream TS1.

The communication I/F unit 208 is an interface that performs data communication with the communication network 4 according to a predetermined communication protocol under the control of the CPU 213. The operation unit 209 is an operation key, a remote controller, or the like, and receives an operation input of the user. The operation unit 209 also has the function of the operation input unit 1C shown in FIG. The NVRAM 210 stores various setting information. For example, the NVRAM 210 stores, as setting information, a content format that the broadcast receiving apparatus 2 can handle.

The ROM 211 stores a program executed by the CPU 213 and the like. The RAM 212 provides a work area when the CPU 213 executes the program. The RAM 212 also provides an area for temporarily storing the EIT information included in the SI separated from the multiplexed transport stream TS1. The CPU 213 centrally controls the operation of the broadcast receiving device 1a by expanding the program stored in the ROM 211 into the work area of the RAM 212 and sequentially executing the program.

The module I/F unit 202 is an interface that connects to the security module 220 that stores encryption key information for conditional access and the like.

The descrambler 214 descrambles the scrambled payload part in the received transport stream TS1 based on the encryption key information stored in the security module 220. The descrambler by the descrambler 214 allows the broadcast receiving apparatus 2 to perform limited reception using EMM or ECM. The storage unit 215 is a large-capacity storage medium such as an HDD (hard disk drive), and stores, for example, received content.

Next, the processing operation relating to the logo data of the receiving device, which is executed under the control of the CPU 213, will be described with reference to the flowchart shown in FIG.

First, when the broadcast signal is received (step S21), the broadcast signal is demodulated to obtain the SDT (step S22). Here, regarding the logo data of the desired broadcast channel (service), the presence or absence of the logo transmission descriptor is repeatedly judged from the acquired SDT (step S23), and if the SDT has the description of the logo transmission descriptor (YES). From the logo transmission descriptor, it is determined whether there is any unreceived logo (step S24). Based on the determination result of step S24, the CDT section of any section_number of the designated service is acquired (step S25), and the logo data distribution descriptor is extracted from the acquired CDT section and analyzed (step S26). Based on the analysis result, the CDT section of the desired logo_type section_number of the designated service is acquired (step S27), the logo data is acquired from the acquired CDT section (step S28), and the series of processes is ended.

That is, according to the above processing procedure, it is possible to know which logo_type logo data is transmitted in which section number section (group). Therefore, set the required logo_type section number to be filtered next. By doing so, the logo data can be efficiently acquired.

As described above, in the logo processing in the transmission device, the reception device, and the transmission/reception device according to the first embodiment, in the logo data transmission in the section format, the correspondence between the logo type of the logo data to be transmitted and the section to be transmitted. Since the logo data distribution descriptor indicating the relationship is specified and transmitted, the required number of types of logo data can be selected regardless of the size of the logo data and efficient in any order. Can be transmitted to.

It should be noted that, in the logo processing in the transmission device, the reception device, and the transmission/reception device according to the first embodiment, the description has been made using the CDT based on MPEG-2 TS adopted in the current terrestrial broadcasting, etc. It may be applied to MH-CDT based on TLV (Type Length Value)/MMT (MPEG Media Transport) which is expected to be adopted in advanced BS/advanced broadband CS broadcasting and the like. When it is applied to MH-CDT based on TLV (Type Length Value)/MMT (MPEG Media Transport), it becomes the same as the broadcasting system of TLV (Type Length Value)/MMT (MPEG Media Transport) in FIG. It is possible to combine both the processing when the audio stream is switched and (2) Logo processing without any problem.

However, in the case of TLV (Type Length Value)/MMT (MPEG Media Transport), there are the following differences in blocks and processing as compared with MPEG-2 TS. For "MH-", see "Reference 1 Structure of control information described in this standard" of ARIB STD-B60, "Tables and descriptors specified in ARIB STD-B10 have the same function." However, in the case where the table identifier and the descriptor tag value are modified to be used in the broadcasting system using MMT, the original table and the descriptor are added by adding "MH-" which means MPEG-H to the beginning of the name. Making a distinction. Is explained.

The MH-CDT section of TLV/MMT corresponds to the CDT section of MPEG-2 TS, the MH-SDT section of TLV/MMT corresponds to the SDT section of MPEG-2 TS, and the MH-logo transmission descriptor of TLV/MMT. Corresponds to the MPEG-2 TS logo transmission descriptor.

The data structure of the above MH-CDT is described in ARIB STD-B60, section 7.3.1.3. In this case, for example, even if the number of bits of the tag field (descriptor_tag) of the logo data distribution descriptor of FIG. 11 is set to 16 bits, its essence is not changed at all.

(Second embodiment)
The second embodiment is based on the first embodiment, and only parts different from the first embodiment will be described.

Second Embodiment Processing of Receiving Device When Switching Audio Streams
The processing of the receiving device when the audio stream is switched is the same as that in the first embodiment.

(Logo processing in the second embodiment)
Hereinafter, as the second embodiment, a transmission device in the case of the TLV/MMT will be described.

FIG. 16 shows the configuration, in which the logo data and the logo management information for managing the logo of this logo data are input, and the logo data modularization unit 21, the MH-CDT section conversion unit 22 and the MH-logo transmission are performed, respectively. After passing through the descriptor generating unit 23 and the MH-SDT sectioning unit 24, the MMT multiplexing unit 25 multiplexes them together with a video signal, an audio signal, etc., and performs error correction coding, which is transmission line coding, modulation, etc. The signal is applied by the encoding/modulation unit 26 and then transmitted as a broadcast signal toward the service area.

Specifically, the transmitted logo data is sent to the logo data modularization unit 21 together with the logo management information (logo identification (logo_id), logo type (logo_type), logo version number (logo_version)). The logo data modularization unit 21 converts the input logo data into logo data modules for each logo_id and logo_type. The modularized logo data module is sent by the logo data modularization unit 21 to the MH-CDT section conversion unit 22.

The MH-CDT sectioning unit 22 distributes the logo data module input from the logo data moduleing unit 21 to a plurality of MH-CDT sections and transmits the section to the MMT multiplexing unit 25. If the MH-CDT section conversion unit 22 can send the logo data module input from the logo data module conversion unit 21 in one section of the MH-CDT, the MH-CDT section conversion unit 22 transmits it to the MMT multiplexing unit 25 without distributing it. To do. Here, MH-CDT is identified for each download_data_id.

Further, the MH-CDT sectioning unit 22 shows the logo data indicating the correspondence relationship between the logo type and the section to be distributed (correspondence relationship between which type (logo_type) the logo is distributed to which section). The distribution information (extended portion in FIG. 17) is sent to the MH-logo transmission descriptor generation unit 23.

The logo management information (logo identification (logo_id), logo type (logo_type), logo version number (logo_version)) is also sent to the MH-logo transmission descriptor generation unit 23.

The MH-logo transmission descriptor generation unit 23 sets 0x01 separately when the CDT transmission method 1 is specified by the logo transmission type (logo_transmission_type), and sets the logo identification (logo_id) and the logo version number in the logo management information. Along with (logo_version), download data identification (download_data_id) is added to generate the logo transmission descriptor shown in FIG. The download data identification (download_data_id) given by the MH-logo transmission descriptor generation unit 23 has the same id as the download data identification (download_data_id) given by the MH-CDT sectioning unit 22. Here, the download_data_id (16 bits) of FIG. 17 is set to the same value as the download_data_id (16 bits) of the MH-CDT shown in FIG. 12, so that the MH-CDT transmission corresponding to a certain broadcast channel (service) It becomes possible to specify the logo data. Here, the MH-logo transmission descriptor generating unit 23 receives the logo data distribution information from the MH-CDT sectioning unit 22, and expands the contents of the logo data distribution information in the MH-logo transmission descriptor shown in FIG. To do.

In the MH-SDT (Service Definition Table) sectioning unit 24, the MH-logo transmission descriptor is placed in the descriptor area of the MH-SDT (Service Definition Table) for each service_id that identifies the broadcast channel. It is arranged and transmitted to the MMT multiplexing unit 25, and is multiplexed together with the MH-CDT section data.

The essential difference from the configuration of the first embodiment shown in FIG. 10 is that instead of newly defining the logo data distribution information as a descriptor and describing it in the descriptor area in the MH-CDT, it is described in the MH-SDT. The MH-logo transmission descriptor (Table 7-79 MH-logo transmission descriptor in 7.4.3.34 of ARIB STD-B60 version 1.4) is described as an extension. The state of this expansion is shown in FIG.

The first section number is described in the start_section_number field, and the number of section divisions transmitting the logo data module is described in the numbers_of_sections field.

This FIG. 17 is an extension of Table 7-79 MH-Logo transmission descriptor of 7.4.3.34 of ARIB STD-B60 version 1.4, and the extended portion is the portion surrounded by the line in FIG.

The information of the expanded part of FIG. 17 is as follows.

logo_type: Indicates the type of logo.

start_section_number: Describe the first section number that transmits the logo data identified by logo_type.

numbers_of_sections: Describe the number of section divisions that transmit the logo data module.

Each piece of information other than the expanded part of FIG. 17 is defined as follows in the structure of the MH-logo transmission descriptor of Table 7-79 in 7.4.3.34 of ARIB STD-B60 version 1.4.

“Logo_transmission_type (logo transmission type): This 8-bit field indicates the logo transmission method shown in Table 7-80 (see ARIB STD-B21).

logo_id (logo identification): These 9 bits describe the ID of the logo data defined for the service (see ARIB STD-B21).

logo_version (logo version number): This 12-bit field describes the version number of the relevant logo_id (see ARIB STD-B21).

download_data_id (download data identification): This 16-bit field represents the identification of the data to be downloaded. It matches the value of download_data_id of MH-CDT where the logo data is located (see ARIB STD-B21).

logo_char (character string for simple logo): These 8 bits describe the character string for simple logo. As described above, in the logo processing in the transmission device, the reception device, and the transmission/reception device according to the second embodiment, the required type of logo data is selected without depending on the size of the logo data. Thus, it is possible to efficiently transmit the data in any order.

Furthermore, by expanding the MH-SDT and describing the logo data distribution information, the logo data distribution information can be acquired before the acquisition of the MH-CDT. Therefore, on the receiver side, first, one of the MH-CDT sections is selected. The step of S25 in FIG. 15 of acquiring and confirming the logo data distribution descriptor is unnecessary, and it is possible to more efficiently acquire the required logo_type logo data.

The processing of this embodiment is also applicable to the case of the MPEG-2 TS system of the first embodiment.

(Structure of the broadcast receiving apparatus 1a according to the second embodiment)
In the configuration of the broadcast receiving device 1a of the second embodiment, the TS processing unit 204 of FIG. 14 is replaced with the TLV/MMT separation unit 12. The broadcast receiving apparatus 1a inputs a received signal of a broadcast wave obtained by a receiving antenna (not shown), performs demodulation processing and error correction decoding processing in the transmission path demodulation/decoding unit 201 to obtain a TLV stream, and performs TS processing. Instead of the unit 204, the TLV/MMT separation unit 12 separates the video stream and the audio stream from the TLV stream, and outputs them to the video decoding unit 205 and the audio processing unit 206.

(Third Embodiment)
The third embodiment is based on the second embodiment, and only portions different from the second embodiment will be described.

(Third Embodiment Processing of receiving device when audio stream is switched)
The processing of the receiving device when the audio stream is switched is the same as that in the first embodiment.

(Logo processing in the third embodiment)
The third embodiment can be realized by a sending device similar to that of the second embodiment. However, the logo data distribution information is not inserted in the MH-logo transmission descriptor. The logo data distribution information is fixedly determined in advance according to the operation regulation, or additionally inserted into the data_module_byte of the MH-CDT.

In advanced broadband satellite digital broadcasting, logo_type for three types of size patterns is defined. One is "2K", which is the same as "HD Large" defined in terrestrial digital broadcasting. The other two are "Small" which is supposed to be displayed on a 4K screen and "Large" which is supposed to be displayed on an 8K screen. The number of vertical and horizontal pixels is twice each compared to "2K". Quadrupled. Also, with the "small" and "large" logos, although the number of colors that can be used at the same time is limited, a color palette is also transmitted in order to be able to use 8-bit RGB full-color colors. Therefore, the upper limit of the logo data size is large.

The maximum size of the "2K" logo is 1152 bytes as in the case of "HD Large" for terrestrial digital broadcasting, and it is possible to send with one MH-CDT, but "Small" is 8000 bytes and "Large" is 16000 bytes. It is assumed to be the upper limit and cannot be sent with one MH-CDT. Therefore, a new regulation for transmitting the logo data by a plurality of MH-CDTs is newly required.

Hereinafter, as a third embodiment, a method for transmitting logo data by a plurality of MH-CDTs will be described.

FIG. 18 shows the flow of processing according to the third embodiment. In FIG. 18, waiting for the input of logo data (step S31), when the logo data is input, it is determined whether the logo_type indicates 2K, large, or small, and the logo data is displayed for each logo_type. The value of section_number to be distributed is set (step S32). Next, in consideration of the maximum capacity of the MH-CDT, the logo data is divided and set in the data_module_byte of the MH-CDT section together with the placement information (step S33), and a series of processing is ended.

That is, in the third embodiment, a service logo having a large size that does not fit in one section is transmitted by the MH-CDT by changing only the operation rule such as a change in the definition of data_module_byte. Therefore, it is added to the ARIB standard for the purpose of creating a new data structure other than MH-CDT, describing a new descriptor to be inserted in MH-CDT, or changing the definition of MH-logo transmission descriptor. And no need to make changes.

Hereinafter, as to the specific processing of the third embodiment, Examples 1 to 5 of the logo processing of the third embodiment will be described.

[Example 1 of logo processing according to the third embodiment]
In the logo data modularization unit 101 shown in FIG. 10, for the syntax of data_module_byte of terrestrial digital broadcasting, the number of bytes of the logo of the corresponding logo_type, that is, the total size of the data divided into each section is Add a field called "total_logo_size". An example thereof is shown in FIG. Also, instead of being prescribed in the terrestrial digital broadcasting as "transmit the logo of each size in the section of the section_number that matches the logo_type value.", the section_number value used for each logo_type is fixed and used. Make the rules as specified.

Here, if
2K 0
Large 1-4
Small 5-6
And

Also, the logo data is divided every 4000 bytes and stored in data_byte. By deciding in this way, the range of section_number of the section acquired to receive the logo of each logo_type can be known in advance without using the information in the received MH-CDT. For example, if you want only the small logo, you should not get the section_number in the data_module_byte by judging the logo_type in the data_module_byte after acquiring all the sections with the section_number from 0 to 6, but the section_number Only the sections 5 and 6 need to be acquired.

Further, by adding total_logo_size and determining the division size, it becomes possible to determine that it is not necessary to receive all the sections of section_number determined by logo_type. For example, if the large logo has a total_logo_size of 10000 bytes, you can see that the data_size of sections with section_number 1 to 4 is 4000byte, 4000byte, 2000byte, and 0byte, respectively, and you do not need to obtain the section of section_number=4. .. Similarly, if the section_number=5 section is acquired and the total_logo_size is 4000 bytes or less, it can be seen that the section_number=6 section need not be acquired.

Here, as an example, the section_number values are assigned in the order of the logotype values, but the order is not limited to this.

Further, although the division size is 4000 bytes as an example here, another value may be used. For example, the division size may be 4070 bytes, and a logo whose total_logo_size is 10000 bytes may be divided into 4070 bytes, 4070 bytes, 1860 bytes, and 0 bytes.

Also, here, as an example, total_logo_size is added to data_module_byte to determine the division size, but you may add information whether there is a continuation in data_module_byte without determining the division size, and also decide the division size. After that, other information such as whether or not there is a continuation may be added.

[Example 2 of logo processing according to the third embodiment]
I don't know in what order the sections are sent in the stream, and while I am getting one section and reconfiguring the section filter to get the next section If one section is acquired and the next section is acquired, it may take a long time to acquire all desired sections. Also, setting the section filter at the same time can shorten the acquisition time, but consumes a lot of resources of the section filter.

As a means for avoiding this, it is possible to specify a mask in the condition of the section filter.

It is a function to acquire a section regardless of whether the value of some bits is 0 or 1. Regarding the mask designation of section_number, it is assumed that the bit designated as 0 is 0, the bit designated as 1 is 1, and the bit that may be 0 or 1 is represented by x.

It is efficient to mask a large logo with a maximum of 4 sections and a small logo with a maximum of 2 sections. Masking with 2 bits for the large logo and 1 bit for the small logo is effective. Therefore, the mask designation of the section_number of the large logo is 000001xx (00000100, 00000101, 00000110, 00000111), and the mask designation of the section_number of the small logo is 0000001x (00000010, 00000011).

If you do this, the section_number value used will be small 2-3
Large 4-7
Becomes

in addition
2K 0
In this case, the section with section_number=1 is unnecessary.

Normally, section_number is arranged from 0 to last_section_number without omission. However, in EIT[schedule] (and MH-EIT[schedule]), an exception is that an intermediate section may be omitted. Therefore, if the MH-CDT is also specified to perform an exceptional operation that the section of section_number=1 is not sent, the logo data of each logo_type can be transmitted in seven sections of section_number of 0 and 2 to 7. ..

Here, as an example, section_number=1 is an unnecessary section, but section_number=0 is an unnecessary section, and logo data of each logo_type may be transmitted in seven sections with section_numbers of 1 to 7.

[Example 3 of logo processing according to the third embodiment]
When mask designation similar to that in the second embodiment is performed, if it can be shown that the data is invalid, it can be realized without performing exceptional operation such as not sending a section in the middle.

For example, it can be realized by deciding not to use the value of 0xFF as the logo_type in the future and determining that it is invalid data when the value of the logo_type of data_module_byte is 0xFF. In the case of a receiver that acquires only the required section_number section, this section is not acquired, so there is no effect on processing. In the case of a receiver that acquires all section_number sections by the mask function of the section filter, it may be determined that the data is invalid data and the data may be discarded.

[Example 4 of logo processing according to the third embodiment]
Alternatively, when the same mask designation as in the second embodiment is performed, the logo data itself for one section may not be sent, but it may be used for transmitting other information.

The 2K logo will be transmitted with section_number=1, and other information will be transmitted with section_number=0.section_number=0 can be used to transmit special data and section_number 1 to 7 can be used to transmit logo data. it can.

For example, when section_number=0, the data_module_byte is shown in FIG. 20, and it is possible to indicate which logo_type logo data is being sent at each section number, that is, the logo data distribution information. In the example of FIG. 20, a loop is rotated by number_of_logo_type, which is the number of logo_types, and the number of bytes of logo data for each section_number (start_section_number + j) used in each logo_type can be specified.

[Example 5 of logo processing according to the third embodiment]
If data_module_byte as shown in FIG. 20 is transmitted with section_number=0, even if the section_number range used in each logo_type is not fixed in the operational rules, after obtaining section_number=0, the section_number of the desired logo_type will be obtained. It is possible to obtain the desired logo_type service logo by taking the two steps of obtaining the section. Although it may take a long time to obtain the desired logo by stepping on two steps, it will be possible to deal with the case where a new logo_type is added in the future.

When the range of section_number is not fixed in the operational rules, the number of sections used in logo_type may be fixed to the maximum or may be variable depending on the size of logo data.

As described above, in the logo processing in the transmission device, the reception device, and the transmission/reception device according to the third embodiment, by changing the definition of data_module_byte or the allocation rule of section_number, a new data structure that is not MH-CDT, Alternatively, a new descriptor to be inserted in the MH-CDT is not additionally defined in the ARIB standard, or the definition of the MH-logo transmission descriptor in the ARIB standard is not changed, and a large size that does not fit in one section is used. The service logo can be transmitted by MH-CDT.

In addition, in Examples 1 to 4 of the logo processing of the third embodiment, it is possible to acquire only the section of the desired logo_type section_number as in the terrestrial digital broadcasting. Further, in Examples 2 to 4 of the logo processing of the third embodiment, it is possible to efficiently obtain a large logo and a small logo by masking section_number and setting a section filter. .. In addition, Example 5 of the logo processing of the third exemplary embodiment can handle a case where a new logo_type is added in the future.

In the third embodiment, CDT and MH-CDT are collectively referred to as common data table information, SDT and MH-SDT are collectively referred to as service description table information, and a logo transmission descriptor and an MH-logo transmission descriptor are referred to. Collectively referred to as the logo transmission descriptor.

Although some embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the scope equivalent thereto. In addition, "broadcast" in the present specification also includes "IP broadcast" using the Internet protocol.

(1) A digital television capable of multiplex transmission of an arbitrary number of different types of logo data of different types per logo identification in a plurality of sections of common data table information, the size of which exceeds the amount of data that can be transmitted in one section of common data table information. A broadcasting system,
By the modularization unit, the logo data is modularized for each logo identification and logo type,
The first sectioning unit distributes the logo data modularized by the modularization unit to a plurality of sections of the common data table information having the same download data identification and outputs the logo data. Generate and output logo data distribution information that indicates the correspondence between the type of and the section to be distributed,
The second sectioning unit determines the logo transmission descriptor from the logo identification of the logo data and the version number of the logo included in the logo management information, and the logo data distribution information having the same download data identification as the download data identification. Generate the information and insert it in the service description table information,
A transmission system for transmitting a broadcast signal in which the common data table information generated by the first sectioning unit and the service description table information generated by the second sectioning unit are multiplexed by the multiplexing unit;
The broadcast signal is received to obtain the service description table information, and the logo transmission descriptor information is extracted from the obtained service description table information to obtain the logo transmission information, the logo management information, and the logo data distribution information. The logo identification and logo type stored in the module from a plurality of sections that are acquired and distributed to the common data table information of the broadcast signal based on the acquired logo transmission information, logo management information, and logo data distribution information. A transmission/reception device equipped with a reception system that acquires logo data for each.

(2) Digital television capable of multiplex transmission of any number of different types of logo data of different types for each logo identification in a plurality of sections of common data table information in a size exceeding the amount of data that can be transmitted in one section of common data table information. Used in broadcasting systems,
A modularization unit that modularizes the logo data by the logo identification and logo type,
The logo data modularized by the modularization unit is distributed and output to a plurality of sections of the common data table information having the same download data identification, and the logo data and the section to be distributed are included in the logo data. A first sectioning unit that generates and outputs logo data distribution information indicating a correspondence relationship with
A service description is generated by generating logo transmission descriptor information from the logo identification and logo version number of the logo data included in the logo management information, and the logo data distribution information having the same download data identification as the download data identification. A second sectioning part to insert into the table information,
A transmission device comprising a common data table information generated by the first sectioning unit and a multiplexing unit for transmitting a broadcast signal in which the service description table information generated by the second sectioning unit is multiplexed. ..

(3) Used in a digital television broadcasting system capable of multiplex transmission of an arbitrary number of different types of logo data for one logo identification, which is larger than the amount of data that can be sent in one section of common data table information,
By the modularization unit, the logo data is modularized for each logo identification and logo type,
The first sectioning unit distributes the logo data modularized by the modularization unit to a plurality of sections of the common data table information having the same download data identification and outputs the logo data. Generate and output logo data distribution information that indicates the correspondence between the type of and the section to be distributed,
The second sectioning unit determines the logo transmission descriptor from the logo identification of the logo data and the version number of the logo included in the logo management information, and the logo data distribution information having the same download data identification as the download data identification. Generate the information and insert it in the service description table information,
Corresponding to a transmission system for transmitting a broadcast signal in which the multiplexing unit multiplexes the common data table information generated by the first sectioning unit and the service description table information generated by the second sectioning unit A receiving device that
A receiver for receiving the broadcast signal,
The service description table information is obtained from the broadcast signal received by the receiving unit, the logo transmission descriptor information is extracted from the obtained service description table information, and the logo transmission information, logo management information, and logo data distribution Acquiring information, the logo identification stored in the module from a plurality of sections distributed to the common data table information of the broadcast signal based on the acquired logo transmission information, logo management information and logo data distribution information, A logo data acquisition unit that acquires logo data for each logo type,
A receiver equipped with.

The above-described first to third embodiments have been described as examples in which the present invention is applied to transmission of service logo data such as a logo mark used in a program section, but the present invention transmits other image data. You may apply to doing.

1, 1a... Broadcast receiving device, 1A... Video processing unit, 1B... GUI display unit, 1C... Operation input unit, 2... AV amplifier, 3... Display device, 11... Transmission line demodulation/decoding unit, 12... TLV/MMT Separation unit, 13... Voice selection control unit, 14... Decoder, 15... DMIX unit, 16... Switching unit, 17... DAC, 18... Voice output unit, 19... External output interface, 21... Logo data modularization unit, 22... MH-CDT section conversion unit, 23... MH-logo transmission descriptor generation unit, 24... MH-SDT section conversion unit, 25... MMT multiplexing unit, 26... Transmission line coding/modulation unit, 101... Logo data modularization Reference numeral 102... CDT section conversion unit, 103... Logo data distribution descriptor generation unit, 104... Logo transmission descriptor generation unit, 105... SDT section conversion unit, 106... Multiplexing unit, 107... Transmission path coding/modulation unit , 201... Transmission line demodulation/decoding section, 202... Module I/F section, 203... Section processing section, 204... TS processing section, 205... Video decoding section, 206... Audio processing section, 207... OSD processing section, 208... Communication I/F section, 209... Operation section, 210... NVRAM, 211... ROM, 212... RAM, 213... CPU, 214... Descrambler, 215... Storage section, 216... Bus.

Claims (1)

A transmission/reception method in a transmission device and a reception device, which transmits logo data indicating a logo by a TLV stream in a section format table CDT (Common Data Table) based on TLV (Type Length Value)/MMT (MPEG Media Transport),
The logo data is prepared for each number of pixels,
The logo data for each number of pixels is identified by the logo type,
The content of the logo transmission descriptor arranged in the descriptor area of the service description table transmitted by the TLV stream changes depending on the logo transmission type.
When the logo transmission type of the logo transmission descriptor is 0x01, the logo transmission descriptor is
A logo identification that describes the ID of the logo data defined in the service description table,
A logo version number that describes the version number of the logo identification,
Download data identification, which represents the identification of the data to be downloaded,
Logotype,
A start section number that represents the first section number that transmits the logo data of the logo type in pieces,
The number of transmission sections that represents the number of sections that transmit the logo data of the relevant logotype, and
Including,
When the size of the logo data of one logotype exceeds the size that can be transmitted in one section, the transmitting device allocates the logo data identified by the logotype to the CDT section having continuous section numbers and transmits the CDT section.
The receiving device acquires the logo data based on the start section number and the transmission section number included in the logo transmission descriptor arranged in the descriptor area of the service description table transmitted by the TLV stream. How to send and receive.

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