JP2000036184A - Data transmission system and data receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply record music data into a storage device without providing a long silence time interval at a signal transmitting side by recording the output of a data receiving device when it is discriminated that silence continues on the input from the device for more than a prescribed time interval and then, an input is received. SOLUTION: The output of an audio compression encoder/decoder 93 is supplied to a level detecting circuit 100 and a detection is made for the level of the audio signals inputted from an input terminal 91 or an optical digital input interface circuit 94. If the silence continues for more than a prescribed time interval and then, an input having more than a prescribed level is received, a recording is started. In order to surely execute a synchronized recording function, a silence condition is set for a prescribed time interval while music data are down loaded when the music arrives at a leading at a prescribed time. The leading of the music to be down loaded is discriminated by the audio adding information from an audio adding information server.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission system and a data receiving apparatus suitable for use in a system for distributing music data by digital satellite broadcasting and recording the music data in a data recording device.

[0002]

2. Description of the Related Art Digital satellite broadcasting has been widely used. Digital satellite broadcasting is more resistant to noise and fading than conventional analog broadcasting, and can transmit high-quality signals. Further, the frequency use efficiency is improved, and the number of channels can be increased. For example, in digital satellite broadcasting, one satellite can secure several hundred channels. In such digital satellite broadcasting, a large number of specialized channels for sports, movies, music, news, etc. are prepared, and programs of respective specialized contents are broadcasted on these specialized channels.

[0003] Among these specialty channels, the music channel is one of the popular channels, and a promotion program mainly for introducing new songs and hit songs is broadcast.

As described above, in a conventional music channel, a new song introduction or a hit song program is transmitted as a moving image and a sound. When the viewer sees such a music channel and finds a favorite song, the viewer may want to purchase a CD or the like of the introduced song and enjoy it. Further, there are times when it is desired to know the information of the artist of the music or the information of the album in which the music is stored. If you are watching a music program and want to know the artist information of the song or the information of the album that contains the song, you can get the information on the spot, and if you find a song you like, It would be very convenient to be able to download the audio data.

[0005] However, in a conventional music channel, a moving image and a sound related to a music are transmitted unilaterally.
Such a request cannot be met.

In order to solve such a problem, information on music broadcast on a music channel can be easily obtained, and the music data can be easily downloaded to a data storage device. A music content distribution system has been proposed.

[0007]

In such a system, when audio data is downloaded to a storage device, a command is automatically given to the storage device, and when the audio data is received, the data is automatically sent to the storage device. It is conceivable to be able to record it in However, in order to construct such a system, an IRD (Integrat
It is necessary to exchange commands and data by connecting the ed Receiver Decoder) and the storage device with an interface such as IEEE1394. Most of the current storage devices do not have an interface through which commands and data can be exchanged.

Therefore, after silence continues for a predetermined time,
It is conceivable to use a so-called synchronous recording function that automatically sets the recording mode when a voice input of a predetermined level or more is made. Such a synchronous recording function is a function that most current storage devices have. To make such a recording function available, the same music data may be repeatedly transmitted, and a silent section may be provided between the music data.

However, in order to reliably operate the synchronous recording function, it is necessary to lengthen a silent section between music data. If a long silence section is provided on the transmitting side,
There is a problem that the number of repetitions of music is reduced.

[0010] Accordingly, an object of the present invention is to provide a data transmission system and a data receiving apparatus which can easily record music data in a storage device by synchronous recording without providing a long silent section on a transmitting side. It is in.

[0011]

SUMMARY OF THE INVENTION The present invention provides a data transmitting apparatus for transmitting content data, a data receiving apparatus for receiving content data from the data transmitting apparatus, and a content data received by the data receiving apparatus. And a data recording device for recording the content data. The data transmitting device repeatedly transmits the data of the content,
The additional information including the time information of the content data is transmitted, and the data receiving device determines the start time of the content data using the time information included in the additional information, and determines the predetermined time before the start time of the content data. The output to the data recording device is silence, the data recording device determines whether or not the input from the data receiving device continues silence for a predetermined time,
This data transmission system records the output of the data receiving device when it is determined that the input from the data receiving device has been made for a predetermined period of time or more after the silence has continued.

According to the present invention, a means for receiving content data and receiving additional information and a time point of content data using time information included in the additional information are determined. Means for silencing the output to the data recording device for a predetermined period of time before.

The start time of the content data is determined using the time information included in the additional information, and the output to the data recording device for a predetermined time before the start time of the content data is silenced. As a result, the data recording device can perform synchronous recording, and can reliably record music data from the beginning of a song.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. The system to which the present invention is applied broadcasts a music program using digital satellite broadcasting, and distributes audio data related to the music program so that a viewer can listen to the music program. If you listen to a song that you like, you can easily purchase the song on the spot.

FIG. 1 shows an overall configuration of a music content distribution system to which the present invention is applied. As shown in the figure, the ground station 1 for digital satellite broadcasting includes a material for television program broadcasting from a television program material server 6, a material for music data from a music material server 7, and an additional audio information server 8 Additional information from the
GUI data from an I (Graphical User Interface) data server 9 is sent.

The television program material server 6 is a server that provides a material of a normal music broadcast program. The material of the music broadcast sent from the television program material server 6 is a moving image and a sound.
For example, a moving image and sound for promotion of a new song introduction are broadcasted, or a countdown of the latest hit songs is broadcasted.

The music material server 7 is a server that provides an audio program using an audio channel. The material of this audio program is audio only. The music material server 7 sends materials of audio programs of a plurality of audio channels to the ground station 1. In the program broadcasting of each audio channel, the same music is repeatedly broadcast for a predetermined unit time. Each audio channel is independent, and various usages can be considered. For example, one audio channel repeatedly broadcasts a recommended song in the latest Japanese pop music for a predetermined time, and another audio channel broadcasts a recommended song.
The recommended song in the latest American pop is repeatedly broadcast for a predetermined time, and in other audio channels,
The recommended music may be repeatedly broadcasted from jazz for a predetermined time. Also, a plurality of songs of the same artist may be divided into respective audio channels and repeatedly broadcast.

The additional audio information server 8 provides additional audio information of the music output from the music material server 7. The additional audio information includes the music playing time and the music playing elapsed time.

The GUI data server 9 includes data for forming a screen of a list page of music to be distributed and an information page of each music, data for forming still image data of a jacket, and an EPG (Electric Program Guide). To provide data for forming the screen of FIG. As will be described later in detail, in a system to which the present invention is applied, lyrics of music to be distributed, artist concert information, and the like can be displayed on the screen by operating a GUI on the screen. Also, by operating the GUI on the screen, it is possible to select a music piece, download it, make a reservation for it, and the like. The data for that purpose is sent from the GUI data server 9. The GUI data includes, for example, MHEG (Multimedia and Hypermedia Information
Coding Experts Group) method is used.

The ground station 1 includes the above-described video data and audio data as the material of the music program broadcast from the television program material server 6 and the audio data as the material of the audio channel from the music material server 7.
The voice additional information from the voice additional information server and the GUI data from the GUI data server 9 are multiplexed and transmitted. At this time, the video data of the television program broadcast is compressed by, for example, the MPEG (Moving Picture Experts Group) 2 system, and the audio data of the television program broadcast is compressed by the MPEG audio system. The audio data of each audio channel is divided into two different formats, eg, MPEG audio format and ATRAC.
(Adaptive Transform Acoustic Coding). These data are encrypted using key information from the key information server 10 at the time of multiplexing.

In the digital satellite broadcasting system,
The billing contract includes a flat system in which a predetermined fee is paid every predetermined period and a PPV system in which a fee is paid according to the content every time the content is viewed.
The main television program is billed in a flat manner, and music data to be downloaded is
Charging is performed by the PV method. In the PPV method, scrambling is performed in units of one event. In the case of music data, the same music data is repeatedly transmitted multiple times within one event.

A signal from the ground station 1 is received by the receiving equipment 3 of each home via the satellite 2. The satellite 2 has a plurality of transponders. One transponder has a transmission capacity of, for example, 30 Mbps. The receiving equipment 3 of each home includes a parabolic antenna 11 and an IRD 1
2, a storage device 13, and a television receiver 14 are prepared.

The signal transmitted via the satellite 2 is received by the parabolic antenna 11. This received signal is transmitted to an LNB (Low Noise Bl) attached to the parabolic antenna 11.
ockDownconverter) 15 is converted to a predetermined frequency,
It is supplied to IRD12.

The IRD 12 selects a program of a predetermined program from a received signal and demodulates video data and audio data. In addition, the IRD 12 includes a list page of music to be distributed, an information page of each music,
A screen for EPG is formed. Then, the output of the IRD 12 is supplied to the television receiver 14.

The storage device 13 is for storing downloaded audio data.
For example, as the storage device 13, an MD (Mini
Disc) Recorder / player, DAT (Digital Audio)
Tape) Recorder / player, DVD (Digital Video Di)
sc) A recorder / player can be used. Further, a personal computer is used as the storage device 13 and its hard disk or CD-R (CD-Recor
dable) can also store audio data.

The IRD 12 is connected to the accounting server 5 via the telephone line 4, for example. An IC card in which various information is stored is inserted into the IRD 12. When the audio data of the music is downloaded, the information is
It is stored on the C card. The information of the IC card is sent to the accounting server 5 via the telephone line 4. The billing server 5 performs appropriate billing from the download information and bills the viewer. As described above, by performing appropriate charging, the copyright of the downloaded music can be protected.

As described above, in the system to which the present invention is applied, the ground station 1 includes the video data and audio data serving as the music program broadcast material from the television program material server 6 and the audio data from the music material server 7. The audio data serving as the material of the channel, the audio additional information data from the audio additional information server 8, and the GUI data from the GUI data server 9 are multiplexed and transmitted. Then, when this broadcast is received by the receiving facility 3 of each home, a music program is viewed, and a GUI screen is displayed based on the transmitted GUI data. When a necessary operation is performed while viewing the GUI screen, an information page for each song can be viewed, and a preview of each song can be performed. Further, by performing necessary operations while viewing the GUI screen, audio data of a desired music piece can be downloaded and stored in the storage device 13.

Next, the operation of the viewer in the receiving facility 3 will be described in more detail. When this broadcast is received by the receiving facility 3 of each home, a screen as shown in FIG. 2 is displayed on the television receiver 14. A moving image based on the music program provided from the television program material server 6 is displayed in the television program display area 21A at the upper left of the screen. In the upper right part of the screen, a list 21B of songs of each channel being broadcast on the audio channel is displayed. A text display area 2 is located at the lower left of the screen.
1C and a jacket display area 21D are set. Furthermore, a lyrics display button 22, a profile display button 23, an information display button 24, a reservation recording button 25, a reservation list display button 26, a recording history display button 27, and a download button 28 are displayed on the right side of the screen.

The viewer searches for an interesting song while looking at the song name displayed in the list 21B.
When the user finds a song of interest, the user operates the arrow keys of the remote commander to move the cursor to the song, and then presses the enter key of the remote commander attached to the IRD 12. As a result, it is possible to listen to the music piece with the cursor. That is, in each audio channel, the same music is repeatedly broadcast during a predetermined unit time, so that the television program display area 21A
Is switched to the audio channel of the song without changing the screen, and the song can be heard. At this time, a still image of the CD jacket of the music is displayed in the jacket display area 21D.

In this state, when the cursor is moved to the lyrics display button 22 and the enter key is pressed (hereinafter, the operation of moving the cursor to the button and pressing the enter key is called the button), the lyrics of the music are displayed in the text display area 21C. Displayed at the timing synchronized with the audio data. Similarly, when the profile display button 23 or the information display button 24 is pressed, the artist profile or concert information corresponding to the music is displayed in the text display area 21C. In this way, the viewer can know what kind of music is currently being distributed,
You can know detailed information about each song.

The viewer presses the download button 28 when he / she wants to purchase the tune listened to. When the download button 28 is pressed, the audio data of the selected music is downloaded and stored in the storage device 13. Along with the audio data of the music, lyrics data, artist profile information, jacket still image data, and the like can be downloaded. Every time a song is downloaded, its information is stored in an IC in the IRD12.
Stored on the card. The information stored on the IC card
For example, it is downloaded to the accounting server 5 once a month. Thereby, the copyright of the downloaded music can be protected.

When the viewer wants to make a reservation for download in advance, he presses the reservation recording button 25.
When this button is pressed, the GUI screen is switched, and a list of songs that can be reserved is displayed on the entire screen. This list can display music searched in units of one hour, one week, or genre. When the viewer selects a song to be reserved for download from this list, the information is registered in the IRD 12. And
If you want to check the songs that have already been reserved for download, press the reserved list display button 26,
It can be displayed on the entire screen. The music thus reserved is downloaded by the IRD 12 at the reserved time and stored in the storage device 13.

When the viewer wants to check the downloaded music, the recording history button 27 can be pressed to display a list of already downloaded music on the entire screen.

As described above, in the receiving equipment 3 of the system to which the present invention is applied, the GUI of the television receiver 14 is used.
A list of songs is displayed on the screen. And this GU
When a song is selected in accordance with the display on the I screen, the song can be previewed, and the lyrics of the song, the artist profile, and the like can be known. Further, it is possible to perform downloading of music and reservation thereof, display of a download history and a list of reserved music, and the like.

As described above, in the music content distribution system to which the present invention is applied, music broadcast programs are distributed, and audio data of music is distributed using a plurality of audio channels. Then, the user can search for a desired music using a list of the music that has been distributed, and can easily store the audio data in the storage device 13. Hereinafter, such a system will be described in more detail.

FIG. 3 shows the configuration of the ground station 1 in the music content distribution system to which the present invention is applied. 3, material data from the television program material registration system 31 is registered in the AV server 35.
This material data is video data and audio data. The data registered in the AV server 35 is sent to a television program transmission system 39, where the video data is compressed by, for example, the MPEG2 system, and the audio data is compressed and packetized by, for example, the MPEG2 audio system. The output of the television program transmission system 39 is sent to the multiplexer 44.

The audio data from the music material registration system 32 is an MPEG2 audio encoder 3
6A and the ATRAC encoder 36B, after being encoded respectively, the MPEG audio server 40
A and registered in ATRAC audio server 40B. MP registered in the MPEG audio server 40A
The EG audio data is sent to the MPEG audio transmission system 43A, where it is packetized and sent to the multiplexer 44. ATRAC data registered in the ATRAC audio server 40B is ATRAC data.
The data is sent to the audio transmission system 43B as quadruple-speed ATRAC data, packetized here, and sent to the multiplexer 44.

Further, the additional audio information from the additional audio information registration system 33 is registered in the additional audio information database 37. The additional audio information registered in the additional audio information database 37 is sent to the additional audio information transmitting system 41, where it is packetized,
Sent to

The GUI data from the GUI material registration system 34 is registered in a GUI material database 38. GU registered in the GUI material database 38
The I material data is sent to the GUI authoring system 42, where the GUI screen data is processed and packetized, and then sent to the multiplexer 44. Here, the GUI material data includes still image information of a jacket, lyric information of music, concert information of an artist, and the like. Still image information is, for example, JPEG (Joint Photograp).
hic Experts Group), and the lyric information is, for example, text data of up to 800 characters and is packetized.

In the multiplexer 44, a video packet and an audio packet from the television program transmission system 39, an audio packet from the MPEG audio transmission system 43A, a quadruple speed audio packet from the ATRAC audio transmission system 43B, and audio additional information The voice additional information packet from the transmission system 41 and the GUI data packet from the GUI authoring system 42 are time-division multiplexed and encrypted using key information from the key information server 10 (FIG. 1).

The output of the multiplexer 44 is sent to a radio wave transmission system 45, where an error correction code is added, modulated,
After being subjected to processing such as frequency conversion and the like, it is transmitted from the antenna to the satellite 2.

FIG. 4 shows an example of data transmitted from the ground station 1. Each data shown in this figure is actually multiplexed on the time axis. As shown in FIG. 4, one event is between time t1 and time t2, and the next event is from time t2. An event is a unit for changing the lineup of music, and is usually in units of 30 minutes or 1 hour. For example, it is conceivable to broadcast the 20th to 11th of the top 20 of the latest hit songs in an earlier event, and broadcast the 10th to 1st in a later event. This event is a unit of encryption.

As shown in FIG. 4, from time t1 to time t2
In the event (1), a music program having a predetermined content A1 is being broadcast in a normal video program broadcast. Time t
In the event starting from 2, a music program having a predetermined content A2 is broadcast. What is broadcast on this normal music program is moving images and audio.

For example, ten audio channels CH1 to CH10 are prepared.
At this time, each audio channel CH1, CH2, C
In H3,..., CH10, the same music is repeatedly transmitted during one event. That is, in the event from time t1 to time t2, the audio channel CH
1, the music B1 is repeatedly transmitted, the music C1 is repeatedly transmitted on the audio channel CH2, and thereafter, the music K1 is similarly transmitted on the audio channel CH10.
Is repeatedly transmitted. In the event starting from the time t2, the music B2 is repeatedly transmitted on the audio channel CH1, the music C2 is repeatedly transmitted on the audio channel CH2, and thereafter, the music K2 is repeatedly transmitted on the audio channel CH10. A silent section (for example, 4 seconds) is provided between the songs so that the distinction between the songs can be recognized. This is MPEG
It is common to the audio channel and the 4 × ATRAC audio channel.

That is, in FIG. 4, the same numbers in parentheses, which are the channel numbers of the MPEG audio channel and the 4 × -speed ATRAC audio channel, relate to the same music. The number in parentheses, which is the channel number of the additional audio information, is the additional audio information added to the audio data having the same channel number. Still image data and text data transmitted as GUI data are also formed for each channel. These data are transmitted in a time-division multiplexed manner in an MPEG2 transport packet, and are reconstructed in the IRD 12 using the header information of each data packet.

Next, the receiving equipment 3 in each home will be described. As shown in FIG. 1, the receiving facilities in each home include:
A parabolic antenna 11, an IRD 12, a storage device 13, and a television receiver 14 are provided. Here, as the IRD 12, as shown in FIG.
An analog audio output terminal Aout, a digital audio output terminal Dout such as IEC958 for transmitting audio data via an optical cable, and a digital interface terminal Dif such as IEEE1394 are provided. Therefore, the storage device 13 having only the analog audio input terminal Ain, IE
A device having a PCM audio input terminal Din such as C958 or a device having a bidirectional digital interface terminal Dif such as IEEE1394 can be connected.

As shown in FIG. 5B, when a storage device 13A having only an analog audio input terminal Ain is used as a storage device,
An analog output terminal Aout of the IRD 12 and an analog input terminal Ain of the storage device 13A are connected by an analog cable. As shown in FIG. 5C, a PCM such as IEC958 is used as a storage device.
When the storage device 13B having the audio input terminal Din is used, the digital output terminal Dout of the IRD 12 and the digital input terminal Din of the storage device 13B are connected by, for example, an IEC958 optical fiber. Further, as shown in FIG. 5D, when a storage device 13C having a bidirectional digital interface terminal Dif such as IEEE1394 is used as the storage device,
Digital interface terminal Dif of D12 and digital interface terminal D of storage device 13C.
is connected with a digital interface cable.

As shown in FIG. 5B, when a storage device having no digital input terminal is used, the downloaded MPEG audio data is subjected to MPEG2 decoding processing in the IRD 12 and further to D / A conversion and output from an analog audio output terminal Aout. Then, the storage device 13A is connected from the IRD 12 via an analog cable.
Sent to In this case, a configuration is adopted in which a control signal is exchanged between the IRD 12 and the storage device 13A using wireless communication such as infrared rays or wired communication using a cable to confirm a connection relationship and a download operation. It is also possible.

As shown in FIG. 5C, when a storage device 13B having a PCM audio input terminal Din is used as the storage device, the downloaded MPEG audio data is stored in the IRD 12
The decoding process of MPEG2 is performed within the device, and the IRD 12 outputs the data as PCM audio data. And IR
From D12, it is sent to the storage device 13B via, for example, an IEC958 optical cable. Again, I
A control signal may be exchanged between the RD 12 and the storage device 13A using wireless communication such as infrared rays or wired communication using a cable to confirm a connection relationship or a download operation. is there.

As a specific example in the case shown in FIG. 5D, IE
When an MD recorder / player having a bidirectional digital interface terminal Dif such as EE1394 is used as a storage device, the downloaded quadruple-speed ATRAC data is directly sent from the IRD 12 via, for example, an IEEE1394 digital interface cable. Sent to storage device.

As described above, devices used as the storage device 13 include analog input devices, PCs, and the like.
There are three systems, one for inputting M audio data and one for inputting ATRAC data.

FIG. 6 shows an example of the configuration of the IRD 12. The IRD 12 has an input terminal T1, an analog video output terminal T as an external terminal or an interface.
2, an analog audio output terminal T3, T4, an optical digital output interface 59, an IEEE 1394 interface 60, a man-machine interface 61, an IC card slot 62, and a modem 63.

The received signal input to input terminal T 1 is supplied to tuner 51. In the tuner 51, the control C
Based on a setting signal from a PU (Central Processing Unit) 58, a signal of a predetermined carrier frequency is selected from the received signals. Then, this received signal is QPSK (Quad
rature Phase Shift Keying) is demodulated, further subjected to error correction processing, and an MPEG transport stream is output.

The output of the tuner 51 is supplied to a descrambler 52. The received ECM (Entitlement Control Message) data and EMM (Entitlement Management Message) data are input to the descrambler 52, and key data for descrambling stored in the IC card 65 is stored in the IC card slot 62. It is input via the control CPU 58. The descrambler 53 descrambles the MPEG transport stream using the received ECM data and EMM data and the key data of the IC card 65. The descrambled MPEG transport stream is sent to the transport IC 53.

The transport IC 53 separates a desired packet from the stream from the descrambler 52 based on a command from the CPU 58.
In a transmission packet, a packet identifier (PI
D) is provided. A desired packet is extracted based on the PID, and the packet is sent to the MPEG audio decoder 54 and the MPEG video decoder 55.

The video signal packet is sent to the MPEG video decoder 55. The audio signal packet is MPE
It is sent to the G audio decoder 54.

The MPEG video decoder 55 receives the video signal packet from the transport IC 53,
An MPEG2 decoding process is performed to form video data before data compression. This video data is N
The signal is supplied to the TSC conversion circuit 57 and the NTSC conversion circuit 57
Then, the video data decoded by the MPEG video decoder 55 is converted into a composite video signal and converted into an analog signal. The output of the NTSC conversion circuit 57 is output from the analog video output terminal T2 to the television receiver 14.

The MPEG audio decoder 54 receives a video signal packet from the transport IC 53, performs an MPEG audio decoding process, and forms audio data before data compression. The decoded audio data is converted into an analog audio signal by the DA converter 56, and then output from the analog audio output terminal T3 to the television receiver 14.
The audio data decoded by the audio decoder 54 is transmitted to the optical digital output interface 59.
Sent to

The setting of the carrier frequency of the received signal is performed based on the channel setting signal input from the remote controller 64 by the viewer. When setting a desired channel, the reception frequency of the tuner 51 is set to a predetermined carrier frequency by referring to an NIT (Network Information Table). Then, PAT (Progra), which is information on a channel at the carrier frequency, is used.
m Association Table), a PMT (Program Map Table) which is information on a desired channel.
ble) is extracted. By referring to this PMT, video, audio,
The PID of the packet of the additional data is obtained.

Further, if there is a sub-channel related to this channel in the PMT, the PMT of this sub-channel can be described. For example, a program for download related to main video and audio is transmitted on a sub-channel. If the PMT of this subchannel is described, the PMT of this subchannel
Is extracted and the PID of the data packet of the desired sub-channel is obtained by referring to the PMT of this sub-channel.

GUI data such as still images such as CD jackets and lyrics and artist information are sent based on the MHEG5 system. For mono-media such as still images and audio, MHEG5 content is created together with a script indicating a display procedure (file information, link information, time information, event) and the like. The created content is D
SM-CC (Digital Storage Media-Command and Cont
rol) format.

The music list 21B is displayed on the screen shown in FIG.
When the user selects a song and listens to the audio data of the song, the audio data of the selected song is extracted by the transport IC 53, decoded by the MPEG audio decoder 54, and subjected to digital / analog conversion by the DA converter 56. After the switch S
The signal is output from the analog audio output terminal T3 to the television receiver 14 through W1.

At this time, the viewer uses the remote control 64 to
When the various operations described above are performed, the operation is sent from the man-machine interface 61 to the control CPU 58. Control CPU5
8 processes the GUI data according to the operation of the viewer.

For example, when the lyrics button 22 is pressed, the text data of the lyrics transmitted as the additional data is supplied to the MPEG video decoder 55. Then, the data is converted into image data using an OSD (On Screen Display) function, converted into a composite video signal by the NTSC conversion block 57, and output from the analog video output terminal T2 to the television receiver. Thereby, at the same time as the sound of the music is played from the speaker of the television receiver 14, the lyrics are displayed in the text display area 21C of the screen in synchronization with the sound.

When the download button 28 is pressed on the screen shown in FIG. 2 and the audio data of the music is downloaded, the sub-channel corresponding to the download button 28 is set. P of this main channel
With reference to the MT, a PID for extracting the PMT of the specified sub-channel is specified. Then, the MPE sent on the sub-channel from the sub-channel PMT
The PID of audio compressed by the G method, audio data compressed by ATRAC, and additional data is specified.

Referring to the PID of this sub-channel,
From the transport IC 53, audio data compressed by the MPEG system, audio data compressed by ATRAC, and additional data are extracted.

An IEEE 1394 interface 60
When an IEEE 1394-compatible storage device is connected, the transport IC 53 selects the quadruple-speed ATRAC data and sends it out to the storage device via the IEEE 1394 interface 60 as it is.

The optical digital output interface 59 has I
When an EC958-compatible device is connected, MPEG audio data is selected by the transport IC 53, decoded by the MPEG audio decoder 54, and transmitted to the storage device via the optical digital output interface 59. When a storage device is connected to the analog audio output terminal T4, MPEG audio data is selected, decoded by the MPEG audio decoder 54, converted into an analog signal by the DA converter 56, and output to the storage device 13.

Next, the storage device 13 will be described. FIG. 7 shows an example of the storage device 13. In this example, an MD recorder / player is used as the storage device 13. The MD recorder / player 13 has a digital interface 94 of an analog input terminal 91IEC958. Further, the MD recorder / player has a synchronous recording function that starts recording when there is a voice input of a predetermined level or more after a predetermined period of silence.

In FIG. 7, reference numeral 71 denotes a magneto-optical disk.
Is driven to rotate. The magneto-optical disk 71 is a disk having a diameter of 64 mm housed in a cartridge.
(Mini Disc). Further, instead of the magneto-optical disk 71, a read-only optical disk can be mounted.

An optical head 73 is provided for the magneto-optical disk 71. The optical head 73 outputs a high-level laser beam for heating a recording track to the Curie temperature during recording, and outputs a relatively low-level laser for detecting data from reflected light by a magnetic Kerr effect during reproduction. Output.

The optical head 73 has a laser diode for outputting laser light, an optical system including a polarizing beam splitter and an objective lens, and a detector for detecting reflected light. The objective lens of the optical head 73 is held by a biaxial device (not shown) so as to be displaceable in a radial direction of the disk and in a direction approaching and separating from the disk.

The magnetic head 7 faces the optical head 73.
4 are provided. The magnetic head 74 applies a magnetic field modulated by data to the magneto-optical disk 71. The entire optical head 73 and the magnetic head 74 can be moved in the radial direction of the disk by a thread mechanism 75.

The optical head 73 causes the magneto-optical disk 71
Is supplied to the RF amplifier 77.
From the RF amplifier 77, a reproduced RF signal, a tracking error signal, a focus error signal, absolute position information recorded in wobble, address information, and the like are extracted by arithmetically processing the output of each detector of the optical head 73. This reproduced RF signal is transmitted to an EFM (Eight To Fourtee).
n Modulation) and ACICR (Advanced Cross Inter
leave Reed-Solomon Code) Encoder / Decoder 7
8 is supplied. Further, the tracking error signal from the RF amplifier 77 is supplied to the servo circuit 79, and the address information is supplied to the address decoder 80, decoded, and output as an absolute position address.

The servo circuit 79 includes a tracking error signal, a focus error signal, and the system controller 8.
Various servo drive signals are generated according to the track jump command, seek command, rotation speed detection information of the spindle motor 72, etc.
5 to perform focus and tracking control.

The overall operation is managed by the system controller 81. In the system controller 81,
An input is provided from the operation input unit 85. Operation input unit 85
Includes a play key, a stop key, an AMS key, a record key, a volume up / down key, and the like. Further, a key for setting synchronous recording is included.

The output of the system controller 81 is supplied to the display unit 86. Various setting states are displayed on the display unit 86.

At the time of recording, an analog audio signal is supplied to the input terminal 91. The analog audio signal is supplied to an A / D converter 92, and the A / D converter 92 digitizes the analog audio signal at, for example, a sampling frequency of 44.1 kHz and a quantization bit number of 16 bits. The output of the A / D converter 92 is supplied to an audio compression encoder / decoder 93.

A digital audio signal from an optical digital input terminal 94 such as IEC958 is supplied to a voice compression encoder / decoder 93.

The audio compression encoder / decoder 93
Audio data is compressed by TRAC (Advanced Transform Acoustic Coding). The audio data is reduced to about 1/5 by the audio compression encoder / decoder 93.
Compressed.

Further, the audio compression encoder / decoder 93
Is supplied to the level detection circuit 100. The level detection circuit 100 detects the level of an audio signal input from the input terminal 91 or the optical digital input interface 94. When performing synchronous recording, the level detection circuit 100 detects an input level. Then, recording is started when there is an input of a predetermined level or more after silence continues for a predetermined time or more.

The output of the audio compression encoder / decoder 93 is output to the RAM 99 under the control of the memory controller 98.
Is stored once. The output of the RAM 99 is EFM and A
It is supplied to the CIRC encoder / decoder 78. EF
By M and ACIRC encoder / decoder 78, A
Error correction coding by CIRC is performed, and further, recording data is EFM-modulated. This EFM and ACIRC
The output of the encoder / decoder 78 is supplied to the magnetic head 74 via the magnetic head drive circuit 82.

The magnetic head drive circuit 82 supplies a magnetic head drive signal to the magnetic head 74 according to the encoded recording data. That is, the magneto-optical disk 71
, A magnetic field from the magnetic head 74 is applied. At this time, a laser beam at a recording level is output from the optical head 73. Thereby, the magneto-optical disk 71
Then, data is recorded by a magnetic field modulation method.

At the time of reproduction, the recording signal of the magneto-optical disk 71 is reproduced by the optical head 73. The output of the optical head 73 is supplied to an RF amplifier 77, from which a reproduced RF signal is obtained. This playback RF
The signals are sent to the EFM and ACIRC encoder / decoder 7
8 is supplied. The EFM and ACIRC encoder / decoder 78 performs EFM demodulation processing and error correction processing by ACIRC on the reproduced RF signal.

The output of the EFM and ACIRC encoder / decoder 78 is temporarily written to the RAM 99 under the control of the memory controller 98. The reading of data from the magneto-optical disk 71 by the optical head 73 and the transfer of reproduced data in the system from the optical head 73 to the RAM 99 are intermittently performed at 1.41 Mbit / sec.

The data written in the RAM 99 is read at the timing when the transfer of the reproduction data becomes 0.3 Mbit / sec, and supplied to the audio compression encoder / decoder 93. In the audio compression encoder / decoder 93, A
The audio data is expanded by the TRAC.

The output of the audio compression encoder / decoder 93 is supplied to a D / A converter 95. The digital audio signal is converted into an analog audio signal by the D / A converter 95. This analog audio signal is output from the output terminal 96.

Here, the writing of data into the RAM 99 /
Reading is performed by specifying an address under the control of the write pointer and the read pointer by the memory controller 81. The write pointer is 1.41 Mbit / sec.
, While the read pointer is incremented at a timing of 0.3 Mbit / sec. Due to the difference between the bit rates for writing and reading, data is stored in the RAM 99 to some extent. At the time when the full capacity data is stored in the RAM 99, the increment of the write pointer is stopped, and the operation of reading data from the magneto-optical disk 71 by the optical head 73 is also stopped. However, since the read pointer is continuously incremented, the reproduced audio output is not interrupted.

Thereafter, only the read operation from the RAM 99 is continued, and if the amount of data stored in the RAM 99 becomes smaller than a predetermined amount at a certain point in time, the optical head 73 is returned again.
, The data read operation and the increment of the write pointer are restarted, and the data is stored in the RAM 99 again.

By outputting the reproduced audio signal via the RAM 99 in this manner, even if tracking is lost due to disturbance or the like, the output of the reproduced audio is not interrupted, and the data storage is performed. For example, by accessing the correct tracking position and restarting the data reading, the operation can be continued without affecting the reproduction output.

The MD recorder / player shown in FIG.
The level detection circuit 100 has a synchronous recording function of detecting whether or not a silence period continues for a predetermined time or more, and starting recording when there is an input of a predetermined level or more after the silence of the predetermined time or more. . In order to ensure that such a synchronous recording function operates, the IRD in FIG. 6 is configured such that when music data is downloaded, if the music is a predetermined time before the beginning, a silent state is set for a predetermined time.

[0092] The beginning of the song to be downloaded can be determined from the additional audio information from the additional audio information server 8 in FIG. 1 (or the additional audio information transmission system 41 in FIG. 3). That is, as the audio additional information, as shown in FIG. 8, a music performance time, a music performance elapsed time, a music title, a player name, and the like are transmitted. The performance time of the music is known from the music performance time, and the performance elapsed time of the music up to that time is known from the music performance elapsed time. Thereby, the start time of the next music piece can be calculated.

Since there is such a silent state, the IEEE
MD that does not have an interface like 1394
Even when a recorder / player is used as a storage device, music data can be reliably recorded from the beginning of a song. Such control can be realized by a flowchart as shown in FIG.

While the main channel television program is being received, the channel as shown in FIG.
Sent by G script. This script is received (Step S1).

A television program on the main channel is received, and audio data of the program is monitored as audio output (step S2). Then, it is determined whether or not the download sub-channel is viewed (step S3).

If it is determined that the sub-channel will not be viewed, the process returns to step S2. If it is determined that the user views the sub-channel, the ECM of the sub-channel is extracted and the sub-channel is descrambled (step S4). Then, the start time of the music is calculated from the audio additional information (step S5).

The start time and the current time of the music piece calculated in step S5 are referred to, and it is determined whether or not the current time is, for example, 10 seconds before the start time of the music piece (step S5).
6). If the current time is not, for example, 10 seconds before the start time of the music, the time until the download is completed is obtained from the current time and the end time of the music, and the time until the download is completed is counted down. Is displayed. Then, the sound of the main channel is output (step S7), and the process returns to step S6.

If it is determined that the current time is, for example, 10 seconds before the start time of the music, a countdown display is performed and the sound is muted (step S8). And
It is determined whether, for example, two seconds before the start time of the music has come (step S9). If it is not two seconds before the start time of the music, the process returns to step S6.

When two seconds before the start time of the music, the muting of the audio output is released, and the audio of the sub-channel is output (step S10). Then, it is determined whether or not the music has ended (step S11).
Returning to step S10, the audio output of the sub-channel is continued. When the song ends, step S2
Is returned to

When the processing shown in the above-mentioned flowchart is performed, an audio output as shown in FIG. 10 is obtained. That is, as shown in FIGS. 10A and 10B, it is assumed that video and audio of the main television are transmitted.
Then, in the sub-channel, as shown in FIG.
Audio data is sent as PEG audio data,
It is assumed that voice additional information is transmitted as shown in FIG. 10D. In the audio data for download (FIG. 10C), the same music data is repeatedly transmitted. A slight silence section TA is provided between the music data to distinguish each music piece.

In this case, mute control is performed as shown in FIG. 10E, and an audio signal is output as shown in FIG. 10F.

That is, when the operation before time t11 is not performed, the sound of the main television broadcast (FIG. 10B) is output.

At time t11, when a preview is performed, MPEG audio data (FIG. 10C) is output for a predetermined preview time TB. When the predetermined preview time TB elapses, the sound returns to the main television broadcast sound.

At time t12, when the download button 28 is pressed, the time t15 at the beginning of the next song is calculated.
Then, the audio output is muted from time point t13 to time point t4 before the head time point t15 of the next song. And
At time t15, MPEG audio data (FIG. 10C) is output.

The reason why the mute section is set to a time point t4 slightly before the head time point t15 of the next music piece is to ensure that the head of the next music piece can be recorded even if there is a time error. That's why. In order to distinguish each song, a slight silence section TA is provided between each song. Therefore, there is no sound until time TA before the time point t15 at the beginning of the next song. Therefore, if the end of the mute is set within the time TA before the start time t15 of the next song, the start of the next song can be reliably recorded even if there is a time error.

From time t15, music data for download shown in FIG. 10C is output. This music data is recorded on the storage device 13. Then, at time t16, the recording of one piece of music data ends.

[0107]

According to the present invention, the start time of the content data is determined using the time information included in the additional information, and the output to the data recording apparatus for a predetermined time before the start time of the content data is muted. I am trying to do it.
As a result, the data recording device can perform synchronous recording, and can reliably record music data from the beginning of a song.

By using the time information included in the additional information, it is possible to display the time until the download starts and the time until the download ends.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of an example of a music content distribution system to which the present invention has been applied.

FIG. 2 is a diagram illustrating an example of a screen displayed on a television receiver in the system illustrated in FIG. 1;

FIG. 3 is a block diagram illustrating an example of a configuration on a transmission side in the system illustrated in FIG. 1;

FIG. 4 is a diagram showing a structure of an example of data transmitted in the system shown in FIG. 1;

FIG. 5 is an explanatory diagram showing a connection relationship between an IRD and a storage device in the system shown in FIG. 1;

6 is a block diagram showing an example of an IRD configuration in the system shown in FIG.

FIG. 7 is a block diagram showing an example of a configuration of a storage device in the system shown in FIG.

FIG. 8 is a schematic diagram used for describing audio additional information.

FIG. 9 is a flowchart used to explain when audio is output in the IRD in the system shown in FIG. 1;

FIG. 10 is a schematic diagram used for explanation when outputting sound in the IRD in the system shown in FIG. 1;

[Explanation of symbols]

3 ... receiving equipment, 12 ... IRD, 13 ... storage device, 14 ... television receiver,

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/93 H04N 7/20 // H04N 7/08 5/93 G 7/081 7/08 Z 7 / 20 (72) Inventor Keiji Yuzawa 6-35 Kita Shinagawa, Shinagawa-ku, Tokyo F-term in Sony Corporation (reference) 5C026 DA25 DA27 5C053 FA20 FA23 GA11 GB06 GB07 GB11 GB15 GB36 GB37 GB38 HA27 JA05 JA07 JA12 JA23 KA24 KA26 LA06 LA11 LA15 5C063 AA01 AB03 AB05 AC01 AC06 CA16 CA20 CA23 DA05 DA07 DA13 DA20 DB09 5C064 AA06 AB02 AB03 AB04 AB06 AC01 AC12 AC17 AC18 AD01 AD06 AD14 DA06 DA10 DA12 5D077 AA21 BA26 CA01 DA01 DA10 DD04 GA02

Claims (7)

[Claims] 1. A data transmitting device for transmitting content data, a data receiving device for receiving content data from the data transmitting device, and a data recording device for recording content data received by the data receiving device The data transmitting apparatus repeatedly transmits content data, transmits additional information including time information of the content data, and the data receiving apparatus uses time information included in the additional information. The start time of the data of the content is determined, and the output to the data recording device is silenced for a predetermined time before the start time of the data of the content. Judgment is made as to whether or not silence continues for a period of time. A data transmission system for recording the output of the data receiving device when it is determined that an input has been made. 2. The data transmitting apparatus sends a script for controlling multimedia, and the data receiving apparatus receives the script, and based on the script, a predetermined time before a start time of data of the content. 2. The data transmission system according to claim 1, wherein control is performed to silence the output to the data recording device. 3. The data transmission system according to claim 1, wherein the data of the content is audio data, and the audio data is compressed and transmitted from the transmitting device to the receiving device. 4. While receiving content data,
Means for receiving the additional information; determining a start time of the data of the content by using time information included in the additional information; and outputting to the data recording device a predetermined time before the start time of the data of the content. Means for silencing the data. 5. A control for receiving a script for controlling multimedia, and controlling the output to the data recording device to be silence for a predetermined time before a start time of the data of the content based on the script based on the script. The data receiving apparatus according to claim 4, wherein the data receiving apparatus is executed. 6. The data receiving apparatus according to claim 4, wherein the data of the content is audio data, and the audio data is transmitted after being compressed. 7. The data receiving apparatus according to claim 4, wherein the estimated download end time of the content is displayed using the time information included in the additional information.