JP2001222858A - Device and method for voice transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that the transmission of only an encoded audio signal to a digital interface is impossible because it is not approved since the CGMS or the SCMS is not being described. SOLUTION: By a TS and demultiplex processing circuit 11, the encoded audio signal is converted to the TS and outputted to a 1394 processing circuit 14, and also the copy control information of the encoded audio signal and a video signal are outputted to a PMT generating circuit 13. The TS of the PMT is produced by the PMT generating circuit 13 and outputted to the 1394 processing circuit 14 and a copy control information producing circuit 15 of a 1394 header. The TS of the video signal is produced by a video signal generating circuit 12 and outputted to the 1394 processing circuit 14. By the 1394 processing circuit 14, the TS of the inputted video signal, the TS of the audio signal and the TS of the PMT are multiplexed and transmitted to an IEEE 1394 transmission line with the copy control information of 1394 header added to the header.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for transmitting an audio signal, and more particularly to an audio transmission apparatus and an audio transmission method for transmitting a compressed digital audio signal with copy management information added thereto.

[0002]

2. Description of the Related Art In MPEG2-TS, CGMS, which is a descriptor determined for copyright information of a video signal, is used.
(Copy Generation Management System) is used as a copy control descriptor, and is generally determined to be inserted in broadcasts and the like in various countries.

On the other hand, in digital transmission of an unencoded audio signal alone, SCMS (Serial Copy Management System), which is an identifier of copyright information for an audio signal, is adopted, and IEC 6095 is used.
8 has been adopted.

[0004] Some audio contents recorded on broadcasts and media require copyright protection, and measures must be taken to prohibit illegal copying. In the case of a video signal + audio signal, CGMS is inserted, and in the case of only an audio signal, SCMS is inserted.

At present, the record industry association of the United States, RIAA (Record Industry Association of Amer
ica) The voice signal transmitted by the voice carrier such as ica) is encoded and becomes data that does not describe SCMS. Therefore, it is not permitted to transmit this voice compressed signal to the digital interface as it is.

Further, DTCP (Digital Transmissi), which is one of the copy protection standards of IEEE 1394, is used.
on Copy Protection)
The transmission of encoded audio signals is not permitted.

[0007]

As described above, in the conventional audio transmission apparatus and the conventional audio transmission method, the transmission of only the encoded audio signal to the digital interface is performed by using the C signal.
GMS and SCMS are not recognized because they are not described. For this reason, there is a problem that it is impossible to transmit only the MPEG2-TS audio signal to a receiver that wants to receive only the MPEG2-TS audio signal.

[0008] The present invention solves the above problem by using an MP.
A receiver that wants to receive the audio signal of EG2-TS
An object of the present invention is to provide a voice transmission device and a voice transmission method capable of transmitting a 2-TS voice signal.

[0009]

To achieve the above object, the present invention includes a first copy control descriptor (eg, SCMS or CGMS) for an audio signal along with the compressed audio signal. An input end to which a stream (for example, SI) is input, copy control descriptor conversion means for converting to a second copy control descriptor (for example, CGMS) according to the first copy control descriptor, Means for generating a stream (for example, PMT) including two copy control descriptors (for example, CGMS); means for generating image data; first packetizing means for packetizing the audio signal; Packetizing means for packetizing data, and packetizing a stream (for example, PMT) including the second copy control descriptor (for example, CGMS) A third packetizing means for outputting data packetized by the first to third packetizing means as data in a digital interface format, and a third copy control in a header of the packet in the digital interface format. Output means for adding information (for example, EMI) to output to the digital interface.

[0010] In addition, together with the compressed audio signal, a first copy control descriptor (for example, SCMS) for the audio signal.
Or CGMS) (eg, S
I) is input, and the second copy control descriptor is converted by the second copy control descriptor according to the first copy control descriptor.
Converting a second copy control descriptor (eg, CGMS) into a stream (eg, PMT) including a second copy control descriptor (eg, CGMS);
Generating image data; packetizing the audio signal by a first packetizing unit; packetizing the image data by a second packetizing unit; and third packetizing unit Packetizing a stream (for example, PMT) including the second copy control descriptor (for example, CGMS), and outputting the data packetized by the first to third packetizing means by the output means. In the form of data in a digital interface format, adding third copy control information (for example, EMI) to a header of a packet in the digital interface format, and outputting the data to the digital interface. Is provided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below in detail with reference to FIGS.

In the present embodiment, as shown in FIG. 3, an audio signal transmitted by digital broadcasting is transmitted to a digital broadcast receiver 31.
, And decodes the MPEG2-TS encoded audio signal of the predetermined audio program as it is, without decoding it.
4 DVHS (Digital VHS) 3 via network
2 is output.

In the digital broadcast receiver 31 shown in FIG. 3, the TS & demultiplex processing circuit 11, video signal generation circuit 12, PMT generation circuit 13, and IEEE 13 shown in FIG.
A 94 processing circuit 14 is provided.

In FIG. 1, a video signal generating circuit 12 includes:
For example, a background video (hereinafter, referred to as BGV) is generated, and a transport stream (hereinafter, referred to as TS) of BGV data, that is, a video signal, is IEEE.
Output to the E1394 processing circuit 14.

TS & demultiplex processing circuit 11
Is input with a TS including an audio program selected by the digital broadcast receiver 31, and demultiplexes and extracts a packet of the selected audio program from the input TS to extract only the audio program. The TS is output to the IEEE 1394 processing circuit 14. If this TS is transmitted by 1394, it becomes as shown in FIG. At this time, it has not been recognized by voice providers that the MPEG2-TS containing only voice is transmitted as 1394.

Further, TS & demultiplex processing circuit 1
1 is copy management information (CG) of a previously selected audio program.
MS or SCMS), and generates the above-described BGV (or BGV + audio program) copy control information,
Output to the MT generation circuit 13.

If this is inserted into the SI (service information) of the audio program as the first copy management information, it is sent to the PMT generation circuit 13 and the B
As the second copy management information for GV + audio, PM
It is generated by the T generator 13 and inserted into the PMT stream.

For example, if the first copy management information (CGMS or SCMS) previously given to a program is copy free, the copy is free to CGMS, and if copy is allowed n times, the copy is prohibited to the copy once of CGMS. In the case of, it is converted to CGMS copy prohibition.

Normally, CG is used in the 1394 output stream.
The MS has a PMT for sending auxiliary information of data to be transmitted.
(Program Map Table)
Is inserted into. The same applies to the present invention, and the PMT generation circuit 13 creates a PMT into which the second copy management information (CGMS) of BGV (or BGV + audio program) is inserted,
The data is output to the IEEE 1394 processing circuit 14 and the copy control information generation circuit 15 for the 1394 header.

The 1394 header copy control information generating circuit 15 converts EMI (Encryption Mode Indicator) which is copy control information to be inserted into the 1394 Isochronous packet header from the input second copy management information of the PMT.
r) is generated and output to the IEEE 1394 processing circuit 14.

The IEEE 1394 processing circuit 14 receives the TS of the BGV data from the input video signal generation circuit 12,
The PMT from the TS & demultiplex processing circuit 11 and the TS of the selected audio program are combined with IEC61883-
In addition to adding a time stamp according to the method specified in No. 4 and adding EMI to the header of the packet, the packet is sent to the IEEE 1394 transmission line. At this time, the TS from the video signal generation circuit 12 and the TS and PMT from the TS & demultiplex processing circuit 11 are set to the same 1394 Is
An ochronous channel is designated and transmitted to the IEEE 1394 transmission line.

In the IEEE 1394 processing circuit 14, TS
& Multiplex transmission of only the MPEG2-TS and PMT of the audio signal from the demultiplexing processing circuit 11, the signal becomes as shown in FIG. Since the consent has not been obtained, the BGV data from the video signal generation circuit 12 is also always multiplexed and the signal shown in FIG.
By transmitting the second copy descriptor (CGMS) based on the video and audio signals by sending the data to the 394 network and performing EMI processing based on the second copy descriptor, it is possible to prevent a violation of the regulation.

The coded audio signal transmitted from the digital broadcast receiver 31 via the 1394 transmission path is subjected to copy control as to whether or not to record it on a DVHS 32 magnetic tape based on CGMS.

Also, in the first embodiment, a description will be given assuming that a digital broadcast receiver transmits to a DVHS (Digital VHS).
Any device that reproduces audio content such as VD can be applied.

In the video signal generating circuit 12, the BGV
For example, a program name or a song title of an audio program included in SI (service information) included in the original content may be detected, and image information of the character may be generated. In this way, it is possible to know from which program the program has been obtained or the title of the song by simply displaying an image on the DVHS side.

As described above, it is possible to provide an audio transmission apparatus and an audio transmission method capable of transmitting an MPEG2-TS audio signal to a receiver that wants to receive the MPEG2-TS audio signal.

(Second Embodiment) Next, a second embodiment of the present invention will be described.
The embodiment will be described in detail with reference to FIGS.

In the present embodiment, as shown in FIG. 5, the MPEG2-TS encoded audio signal reproduced from the DVD audio 41 is directly decoded without being decoded by the IEEE 1394 standard.
The data is output to a digital television 52, a digital amplifier 53, or a recording / reproducing DVD 54 via a network.

The DVD audio 51 shown in FIG.
, A DVD audio signal processing circuit 42, an MPEG2-TS conversion circuit 43, a second copy control descriptor conversion circuit 45, a PMT generation circuit 46, IEEE1
A 394 processing circuit 47 and a second copy control descriptor conversion circuit 45 are provided.

Referring to FIG. 4, a video signal generating circuit 41
BGV is generated, and TS of BGV data is converted to IEEE139
4 to the processing circuit 47.

The DVD audio signal processing circuit 42 transmits the reproduced data reproduced from the read circuit such as the DVD audio pickup to the MPEG2-TS conversion circuit 43, and transmits the detected first copy control descriptor SCMS to the MPEG2-TS conversion circuit 43. The second copy control descriptor conversion circuit 45 converts the copy control descriptor into the second copy control descriptor. The second copy control descriptor conversion circuit 45 converts the CGMS into a CGMS corresponding to the SCMS,
Output to the generation circuit 46.

The PMT generating circuit 46 generates a PMT signal which is an information table relating to the 1394 output signal including the CGMS, and outputs the PMT signal to the MPEG2-TS conversion processing circuits 43 and 1.
The 394 header is output to the copy control information generation circuit 48. For example, CGM when SCMS copy free
S copy free, CGMS copy prohibited when SCMS copy prohibited, CGMS copy once when SCMS copy n times allowed (only one copy allowed)
And outputs it to the PMT generation circuit 46.

Output to the MPEG2-TS conversion circuit 43.
The MPEG2-TS conversion processing circuit 43 outputs the MPEG2-TS
And outputs the result to the IEEE 1394 processing circuit 47.

The 1394 header copy control information generation circuit 48 generates 1394 header copy control information (EMI) from the input PMT, and outputs it to the IEEE 1394 processing circuit 47.

The IEEE 1394 processing circuit 47 includes a video signal generation circuit 41 and an MPEG2-TS conversion processing circuit 43.
A time stamp is added to each of the signals input from the above-mentioned devices according to the method defined in IEC61883-4, and the copy control information from the copy control information generation circuit 48 of the 1394 header is inserted into this packet. The signal to be indicated is transmitted to the digital television 52 or the digital
Output to At this time, the TS from the video signal generation circuit 41
And the TS and PMT from the MPEG2-TS conversion processing circuit 43 are designated to the same 1394 Isochronous channel and transmitted to the IEEE 1394 transmission path.

In the IEEE 1394 processing circuit 47, the IE
MPEG2-T, as specified in C61883-4.
When only the TS (audio signal and PMT TS) from the S processing circuit 43 is transmitted in 1394, the signal becomes as shown in FIG. 2 (b), which is not recognized by the audio service provider. BGV from the video signal generation circuit 41
Data is also multiplexed and a signal as shown in FIG. 2 (c) is sent to the IEEE 1394 network to prevent a violation of regulations.

The signal transmitted from the DVD audio 51 via the 1394 transmission path is subjected to copy control of the encoded audio signal based on the second copy control descriptor (CGMS), and the digital television 52 or the digital amplifier 5
3. Processing is performed on the recording / reproducing DVD 54.

The BGV generated from the video signal generation circuit 41 in FIG. 4 may be a fixed image pattern irrespective of the audio information to be output, or the OSD (OSD) included in the sub-picture data recorded in the disk data. Image information (OSD) may be created from on-screen data (On ScreenData) data or character information and output as a BGV.

As described above, it is possible to provide an audio transmission apparatus and an audio transmission method capable of transmitting an MPEG2-TS audio signal to a receiver that wants to receive an MPEG2-TS audio signal.

The digital amplifier 53 outputs the T
Although S is received, since there is no display processing internally, only the audio signal is eventually processed.

The following is common to the first and second embodiments.

In the present embodiment, BGV data is used. However, the present invention is not limited to this. A normal moving picture video signal or a blue-back screen may be used. For example, it is not preferable to insert a single still image only at the beginning of an audio program because it is close to flowing only an encoded audio signal to the IEEE 1394 digital interface.

IEEE 1394 is based on the CGMS value in the PMT of MPEG2-TS.
EMI (Encryption Mode Indicato) of ous Packet header
r) Since the insertion of 2-bit copy control information as a value is standardized by DTCP, this is used. For example, when a digital broadcast receiver records the contents of a service on a digital recording device such as a DVHS by a digital interface, the DTCP system performs copy control by EMI based on CGMS.

This is because, when an audio signal is output together with a video signal, an audio provider such as RIAA recognizes that audio copy control may be performed by CGMS of the video signal.

[0045]

As described above, according to the present invention,
The receiver that wants to receive only the MPEG2-TS audio has MP
EG2-TS audio signals can be transmitted.

[Brief description of the drawings]

FIG. 1 is an exemplary view for explaining a voice transmission device according to a first embodiment;

FIG. 2 is a diagram for explaining a 1394 transmission signal.

FIG. 3 is an exemplary view for explaining a configuration example including the voice transmission device according to the first embodiment;

FIG. 4 is a diagram illustrating a voice transmission device according to a second embodiment.

FIG. 5 is a diagram for explaining a configuration example including a voice transmission device according to a second embodiment;

[Explanation of symbols]

11: TS & demultiplex processing circuit, 12: video signal generation circuit, 13: PMT generation circuit, 14: IEEE
1394 processing circuit.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenji Shimoda 70 Yanagimachi, Saiwai-ku, Kawasaki-shi, Kanagawa F-term in Toshiba Yanagimachi Plant (reference) 5D044 AB05 AB08 BC01 BC06 CC03 CC06 DE50 DE58 DE83 EF05 FG18 HL11 9A001 BB04 EE04 KK60 LL03

Claims (6)

[Claims] 1. An input terminal to which a stream including a first copy control descriptor for an audio signal is input together with a compressed audio signal, and a second copy according to the first copy control descriptor. Copy control descriptor conversion means for converting to a control descriptor, means for generating a stream including a second copy control descriptor, means for generating image data, and first packetization for packetizing the audio signal Means, packetizing means for packetizing the image data, third packetizing means for packetizing a stream including the second copy control descriptor, and first to third packetizing means Means for outputting data packetized by means as data in a digital interface format, By adding a third copy control information in the header, the audio transmission device characterized by comprising an output means for outputting to the digital interface. 2. The copy control descriptor conversion means according to claim 1,
Is copy-free when the copy control descriptor is copy-free, and copy-prohibited when copy is prohibited, copy n (n
2. The audio transmission apparatus according to claim 1, wherein the conversion is performed to a second copy control descriptor that permits one-time copying when permission is granted for a natural number of times. 3. The audio transmission device according to claim 1, wherein said output means outputs said image data once in a predetermined period. 4. The apparatus according to claim 1, wherein said image data generating means is means for generating a still image irrespective of a sound to be transmitted in an audio transmission device provided with a means for outputting to said digital interface. An audio transmission device according to claim 1. 5. The voice according to claim 1, wherein the image data generating means is an image generating means for displaying characters or images based on information inserted in the service information of the content. Transmission equipment. 6. A step of inputting a stream including a first copy control descriptor for the audio signal together with the compressed audio signal, and converting the first copy control descriptor to the first copy control descriptor by copy control descriptor conversion means. Responsively converting to a second copy control descriptor; generating a stream including the second copy control descriptor; generating image data; Packetizing a signal; packetizing the image data by a second packetizing unit; and packetizing a stream including the second copy control descriptor by a third packetizing unit. Output means for converting the data packetized by the first to third packetizing means into digital interface format data. While the force, said header digital interface format of a packet by adding a third copy control information, voice transmission method characterized by comprising the step of outputting to the digital interface.