WO2012160782A1 - Dispositif de transmission de flux binaire, système de transmission/réception de flux binaire, dispositif de réception de flux binaire, procédé de transmission de flux binaire, procédé de réception de flux binaire et flux binaire - Google Patents

Dispositif de transmission de flux binaire, système de transmission/réception de flux binaire, dispositif de réception de flux binaire, procédé de transmission de flux binaire, procédé de réception de flux binaire et flux binaire Download PDF

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Publication number
WO2012160782A1
WO2012160782A1 PCT/JP2012/003205 JP2012003205W WO2012160782A1 WO 2012160782 A1 WO2012160782 A1 WO 2012160782A1 JP 2012003205 W JP2012003205 W JP 2012003205W WO 2012160782 A1 WO2012160782 A1 WO 2012160782A1
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bitstream
elementary
audio stream
encoding format
audio
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PCT/JP2012/003205
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English (en)
Japanese (ja)
Inventor
孝祐 西尾
宮阪　修二
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パナソニック株式会社
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Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to CN201280023907.9A priority Critical patent/CN103620678B/zh
Priority to EP12788834.5A priority patent/EP2711924B1/fr
Priority to JP2013516194A priority patent/JP5843856B2/ja
Publication of WO2012160782A1 publication Critical patent/WO2012160782A1/fr

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/16—Vocoder architecture
    • G10L19/167—Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes

Definitions

  • the present invention includes a bitstream transmission apparatus that transmits a compression-coded audio signal to another apparatus, and a reception apparatus that receives the audio signal transmitted from the bitstream transmission apparatus and outputs audio.
  • the present invention relates to a bitstream transmission / reception system.
  • video signals and audio signals recorded after compression encoding are read from a recording medium such as a CD-ROM, DVD-ROM, semiconductor memory, and hard disk, and the read video signals and audio signals are decoded (expanded).
  • a data reproducing apparatus for outputting is known. Then, the data reproduction device sends the decompressed data to a video monitor, an audio speaker, and the like connected to the data reproduction device. This realizes video and audio playback. Also, when playing back digital broadcast, the data playback device receives the compressed and encoded video signal and audio signal, and decodes the compressed and encoded video signal and audio signal in the same way as playback from the recording medium. Output. This realizes video and audio playback.
  • MPEG-2 As a main example of the image data encoding standard, there are MPEG-2 and MPEG-4.
  • main examples of the audio data coding standard include Dolby Digital, DTS (Digital Theater System), MPEG Audio, and MPEG-4 AAC (Advanced Audio Coding).
  • a PCM (Pulse Code Modulation) system that does not reduce the amount of information can be cited.
  • Dolby Digital is a registered trademark of Dolby Corporation.
  • DTS Digital Theater System
  • a signal encoded by these audio data encoding methods is hereinafter referred to as an “elementary audio stream”.
  • a digital TV and an AV receiver are connected using S / PDIF (Sony Philips Digital Interface) or HDMI (High-Definition Multimedia Interface).
  • S / PDIF Synchronization Philips Digital Interface
  • HDMI High-Definition Multimedia Interface
  • the AV receiver realizes the reproduction of the audio signal by decoding and outputting the received elementary audio stream.
  • FIG. 7 is a diagram showing an example of the data configuration of the output bit stream in IEC 60958 / IEC 61937.
  • FIG. 7A shows an example of the data structure of an elementary audio stream defined by IEC60958 / IEC61937.
  • FIG. 7B shows an example of the data structure of an audio bit stream for transmitting an elementary audio stream.
  • the elementary audio stream 300 includes a plurality of frames that are units including a predetermined number of samples (for example, 1024 samples).
  • Each frame includes a header part (Header) and an encoded data part (EncodedData).
  • the encoded data portion of the actual sound is recorded in the encoded data portion, and the attributes of the encoded signal recorded in the encoded data portion, such as the sampling rate and the number of channels, are recorded in the header portion.
  • the formats for recording the attribute of the encoded signal in the header part include an ADTS (Audio Data Transport Stream) format and a LOAS (Low Overhead Audio Stream) format.
  • 8A and 8B are diagrams illustrating an example of the data format of the header part of the bit stream in IEC60958 / IEC61937.
  • FIG. 8A shows an example of a description in a fixed header in the ADTS format.
  • the eighth line from the top of the table of FIG. 8A shows a format for describing the sampling frequency of the encoded signal in ADTS.
  • the sampling frequency of the encoded signal is selected from 0x3 to 0x8.
  • FIG. 8B shows an example of the description in the LOAS format header.
  • the format for describing the sampling frequency of the encoded signal in the header is also defined in the LOAS format.
  • the MPEG audio AAC method of the international standard and the HEAAC (High-Efficiency Advanced Audio Coding) method are used. well known.
  • the HEAAC system is a system in which a frequency band expansion technique called SBR (Spectral Band Replication) is applied to the AAC system. Further, the HEAAC method can perform reproduction processing compatible with AAC if the SBR information is not processed intentionally or if it is a decoder that cannot process SBR information in the first place.
  • Whether or not the encoded signal described in the encoded data part is encoded by applying the SBR technique can be determined by analyzing information in the encoded data part. That is, the above can be analyzed by examining the bit structure of the dashed frame in the elementary audio stream 300 of FIG.
  • a broken line frame is an information storage structure called Extension_payload in the AAC standard.
  • Whether or not the SBR technique is applied to the encoded signal can be determined according to whether or not SBR information is stored in the Extension_payload.
  • the Extension_payload is arranged at the end of each frame, but the Extension_payload does not necessarily exist in each frame.
  • the audio bit stream 301 is an IEC 61937 format audio bit stream.
  • the IEC61937 format audio bitstream is obtained by adding preamble signals named Pa, Pb, Pc, and Pd to the elementary audio stream. Furthermore, an invalid signal called “Stuffing” for adjusting the signal length may be inserted after the elementary audio stream.
  • FIG. 9 is a diagram showing a data format of the preamble signal Pc shown in FIG. 7B.
  • a portion surrounded by a broken line in FIG. 9 is a portion showing an example of data for describing the presence / absence of SBR information (a signal indicating AAC or HEAAC) in the LOAS format in the preamble signal Pc.
  • SBR information a signal indicating AAC or HEAAC
  • the elementary audio stream 300 is in the LOAS format.
  • the value indicated by 2 bits from the 5th bit to the 6th bit of the preamble signal Pc is 1, it indicates that the elementary audio stream does not include SBR information.
  • the encoded signal recorded in the encoded data portion is encoded by the AACLC method or the AAC method. Also, when the value indicated by the 5th bit from the 0th bit to the 4th bit of the preamble signal Pc is 23 and the value indicated by the 2nd bit from the 5th bit to the 6th bit of the preamble signal Pc is 2, the element It is indicated that the mental audio stream 300 includes SBR information. That is, it is indicated that the encoded signal recorded in the encoded data portion is encoded by the HEAAC method.
  • the bitstream transmitting apparatus when the bitstream transmission apparatus using the above technique receives an elementary audio stream such as the elementary audio stream 300, the bitstream transmitting apparatus detects the presence / absence of SBR information from the Extension_payload of the elementary audio stream. Then, when there is no SBR information, the bit stream transmission apparatus designates AAC according to the bit structure shown in FIG. 9 in the preamble signal Pc. On the other hand, when there is SBR information in Extension_payload, the bitstream transmission apparatus specifies HEAAC. Other preamble signals Pa, Pb, and Pd are also set in accordance with the bit structure and the definition of the meaning of the signal. Then, stuffing is inserted as necessary to generate an audio bit stream in the IEC 61937 format.
  • FIG. 10 is a diagram illustrating the relationship between the sampling rate of the elementary audio stream and the audio encoded data format of audio data that can be selected for the sampling rate.
  • the bitstream standard is not defined (1 to 3 lines from the top of FIG. 10). Eye).
  • the bitstream standard is not defined (FIG. 10). 4th to 5th lines).
  • the bitstream standard is defined even though the operation is regulated by digital broadcasting or the like. Absent. As a result, there is a problem that even if a high-quality elementary audio stream encoded using HEAAC is received, the elementary audio stream cannot be reproduced and enjoyed by an external multi-channel speaker system or the like.
  • the program content portion is broadcast with an audio encoded data format of HEAAC and an AAC sampling rate of 48 KHz, while the commercial portion has an audio encoded data format of AACLC and AAC sampling rate. Is broadcast at 48 KHz, the output sampling frequency is switched at the transition between the program content portion and the commercial portion.
  • FIG. 11A and 11B are diagrams showing the difference between the frequency band decoded and reproduced by the HEAAC decoder and the frequency band decoded and reproduced by the AAC decoder.
  • FIG. 11A shows a reproducible frequency band in encoded data with HEAAC and an AAC sampling rate of 48 KHz.
  • HEAAC reproduces a signal in a frequency band twice that of AAC by using SBR technology (Spectral Band Replication) for a signal in a frequency band reproduced by AAC. That is, the solid line portion in FIG. 11A shows a signal of 0 to 24 kHz reproduced by AAC of 48 kHz, and the band of 24 to 48 kHz of the broken line portion shows a band expanded by the SBR technique.
  • FIG. 11B shows a frequency band in which encoded data having AAC and an AAC sampling rate of 48 KHz is reproduced. As shown in FIG. 11B, a signal in the same frequency band as the frequency band reproduced by the AAC unit in HEAAC is generated.
  • a signal with an IEC60958 frame rate of 96 KHz is output in the program content portion, and a signal with an IEC60958 frame rate of 48 KHz is output in the commercial portion.
  • a process for re-synchronizing in response to a change in the frame rate of IEC 60958 of the bit stream received by the AV receiver is required. And since this process takes time, there is a problem that the sound is cut off by switching between the program part and the commercial part.
  • an object of the present invention is to provide a bitstream transmission device that can transmit an audio bitstream that conforms to a case where the actual encoding format corresponding to the sampling frequency does not conform to a predetermined format.
  • a bitstream transmission device is a bitstream transmission device that transmits an audio bitstream of a predetermined format, and is an element obtained by encoding an audio signal.
  • An input unit for acquiring a primary audio stream, an analysis unit for analyzing a sampling frequency and a coding format of the elementary audio stream, and a preamble signal including information indicating a coding format of the elementary audio stream are analyzed.
  • a preamble generation unit that generates according to the analysis result of the unit, and a shaping unit that shapes the audio bitstream of the predetermined format by adding the preamble signal generated by the preamble generation unit to the elementary audio stream; , Molded at the molding part An output unit that outputs the audio bitstream, wherein the preamble generation unit is configured to output the predetermined bit rate of the audio bitstream according to the sampling frequency and the encoding format obtained from the analysis result of the analysis unit.
  • An encoding format conforming to the format and different from the encoding format obtained from the analysis result of the elementary audio stream is described as information indicating the encoding format in the preamble signal.
  • the preamble generation unit has an encoding format that conforms to the predetermined format of the audio bitstream according to the sampling frequency and the encoding format obtained from the analysis result of the analysis unit, and An encoding format different from the encoding format obtained from the analysis result of the elementary audio stream is described as information indicating the encoding format in the preamble signal.
  • the bitstream transmission apparatus can transmit an audio bitstream that conforms to a case where the actual encoding format corresponding to the sampling frequency does not conform to the predetermined format. .
  • the preamble generation unit may describe information indicating the encoding format in the preamble signal so that an output transmission rate of data output from the output unit is in a predetermined range.
  • the “predetermined range” is, for example, 1536 kbps, 1411.2 kbps, and 1024 kbps, which are bit rates that can be transmitted according to the standard.
  • the bitstream transmission device can set the output transmission rate of the audio bitstream determined according to the sampling frequency and the encoding format of the elementary audio stream to a transmittable transmission rate. it can.
  • the preamble generation unit uses the SBR (Spectral Band) in the elementary audio stream as information indicating the encoding format. It is also possible to generate a preamble signal such that the audio bit stream falls within the corresponding range of the IEC 61937 standard by describing a coding format different from the analyzed coding format in terms of presence or absence of (Replication) information.
  • SBR Spectrum Band
  • the bitstream transmission device provides a preamble when the sampling frequency and the encoding format obtained from the analysis result of the analysis unit do not conform to the predetermined format of the audio bitstream.
  • the bit stream transmission apparatus can generate and transmit an audio bit stream that conforms to a predetermined format with a small processing load.
  • the preamble generation unit may further include the elementary audio stream in the SBR information when the sampling frequency obtained from the analysis result of the analysis unit is a predetermined second frequency. It may be described as information indicating the encoding format in the preamble signal that the encoding is not performed.
  • the bitstream transmission device can encode the elementary audio stream in an encoding format that does not include the SBR information when the sampling frequency of the elementary audio stream is the second frequency.
  • Encoding can be described as information indicating the encoding format in the preamble signal. Therefore, when the sampling frequency of the elementary audio stream is the second frequency, the elementary audio stream can always be decoded in the encoding format without the SBR information, so that the sampling frequency can be prevented from changing.
  • the preamble generation unit may include the code in which the elementary audio stream is included in the SBR information when the sampling frequency obtained from the analysis result of the analysis unit is a predetermined third frequency. Even if it is not encoded in the encoded format, a preamble signal indicating that it is encoded in the encoded format including the SBR information may be generated.
  • the bit stream transmission device can be controlled to forcibly perform the SBR process when the sampling frequency of the elementary audio stream is the third frequency.
  • the bit stream transmission device can adapt the audio bit stream to a predetermined format when the third frequency is in a low frequency range.
  • the preamble generation unit may encode the elementary audio stream including the SBR information when the sampling frequency obtained from the analysis result of the analysis unit is a predetermined fourth frequency. Even if it is encoded in a format, a preamble signal indicating that it is encoded in an encoding format not including the SBR information may be generated.
  • the bit stream transmission device can be controlled to perform decoding with AAC without SBR when the sampling frequency of the elementary audio stream is the fourth frequency. Therefore, the bit stream transmitting apparatus can adapt the audio bit stream to a predetermined format when the fourth frequency is a high frequency band.
  • a bitstream transmission / reception system includes the bitstream transmission device and a bitstream reception that receives the audio bitstream transmitted from the bitstream transmission device and decodes the received audio bitstream.
  • a bitstream transmission / reception system comprising: a preamble removal unit that extracts the elementary audio stream by removing the preamble signal included in the received audio bitstream; Information indicating the encoding format of the elementary audio stream described in the preamble signal, and the elementary audio stream included in the elementary audio stream And an elementary decoding unit that decodes the elementary audio stream in an encoding format indicated by the information indicating the encoding format described in the preamble signal when the encoding format information is inconsistent. May be.
  • a bitstream transmission / reception system includes the bitstream transmission device and a bitstream reception that receives the audio bitstream transmitted from the bitstream transmission device and decodes the received audio bitstream.
  • a bitstream transmission / reception system comprising: a preamble removal unit that extracts the elementary audio stream by removing the preamble signal included in the received audio bitstream; Information indicating the encoding format of the elementary audio stream described in the preamble signal and the code of the elementary audio stream included in the elementary audio stream.
  • the decoding process using the SBR information is performed with the signal expanded to a high frequency set to 0 according to the information indicating the encoding format described in the preamble signal.
  • An elementary decoding unit may be provided.
  • a bitstream transmission / reception system includes the bitstream transmission device and a bitstream reception that receives the audio bitstream transmitted from the bitstream transmission device and decodes the received audio bitstream.
  • a bit stream transmission / reception system comprising: a preamble removal unit that extracts the elementary audio stream by removing the preamble signal from the received audio bit stream; and the preamble Information indicating the encoding format of the elementary audio stream described in the signal and the encoding format of the elementary audio stream included in the elementary audio stream.
  • the bitstream reception device includes a capability notification unit that notifies the bitstream transmission device of information indicating the capability of the bitstream reception device, and the analysis unit indicates a sampling rate of the elementary audio stream. Analyzing the FS information, if the preamble generation unit has a predetermined value, whether to generate a preamble signal indicating that the SBR information is included according to the information from the notification unit May be switched.
  • the bit stream receiving apparatus adds a preamble signal including information indicating an encoding format of the elementary audio stream to the elementary audio stream obtained by encoding the audio signal.
  • the audio bitstream of the predetermined format which is formed in the case where the sampling frequency of the elementary audio stream and the encoding format do not conform to the predetermined format of the audio bitstream
  • a receiving unit that receives an audio bitstream described as information indicating the encoding format in the preamble signal from a bitstream transmitting device, and an encoding format that conforms to the predetermined format; and the received audio bitstream
  • a preamble removing unit that extracts the elementary audio stream by removing the preamble signal included in the stream; information indicating an encoding format of the elementary audio stream described in the preamble signal; and the elementary
  • the elementary audio is encoded in the encoding format indicated by the information indicating the encoding format described in the preamble signal.
  • the bit stream receiving device of the present bit stream transmission / reception system provides information indicating the encoding format described in the preamble signal and information indicating the encoding format of the elementary audio stream included in the elementary audio stream.
  • the elementary audio stream can be decoded in the encoding format indicated by the information indicating the encoding format described in the preamble signal. Therefore, the bit stream receiving apparatus can consistently process the audio bit stream even when the information indicating the encoding format in the elementary audio stream and the information indicating the encoding format in the preamble signal are inconsistent. Can be decrypted.
  • the bitstream reception device may be configured such that when the sampling frequency of the elementary audio stream is a predetermined third frequency, the elementary audio stream is in the encoding format in which the SBR information is included. Even if it is not encoded, an audio bitstream including a preamble signal indicating that it is encoded in the encoding format including the SBR information is received, and the elementary decoding unit describes the preamble signal. If the information indicating the encoding format of the elementary audio stream is mismatched with the information indicating the encoding format of the elementary audio stream included in the elementary audio stream, the information is described in the preamble signal. The sign being According to the information indicating the format, the signal is expanded in the high band may be subjected to decoding processing employing the SBR information as 0.
  • the bitstream reception device may encode the elementary audio stream in an encoding format including the SBR information when the sampling frequency of the elementary audio stream is a predetermined fourth frequency.
  • the decoding processing employing the SBR information may generate a signal of half the sampling frequency when performing.
  • the present invention can provide a bit stream transmission device that can transmit an audio bit stream that conforms to a case where the actual encoding format corresponding to the sampling frequency does not conform to a predetermined format. .
  • the sampling rate of the input elementary audio stream and the encoding format corresponding to the sampling rate are transmitted in accordance with the IEC 61937 standard.
  • the bit stream can be transmitted so as to be within the IEC 61937 standard range.
  • the parameter P described in the preamble signal added to the received bit stream and the parameter P included in the elementary audio stream constituting the bit stream are included in the parameter P. Even when the corresponding parameter E is inconsistent, the decode signal can be generated normally.
  • bitstream transmission in the case of AAC with low FS, bitstream transmission can be performed so as to be within the IEC 61937 standard range.
  • bitstream transmission in the case of a high FS HEAAC, bitstream transmission can be performed within the IEC 61937 standard range.
  • FIG. 1 is a diagram showing an example of a configuration of a bit stream transmission apparatus according to Embodiment 1 of the present invention.
  • FIG. 2 is a diagram showing an example of the configuration of the bit stream receiving apparatus according to Embodiment 1 of the present invention.
  • FIG. 3 is a diagram illustrating an application example of the bit stream transmission / reception system according to Embodiment 1 of the present invention to an audio system.
  • FIG. 4A is a diagram for explaining a difference between reproduction bands of the AAC method and the HEAAC method according to Embodiment 1 of the present invention.
  • FIG. 4B is a diagram for explaining a difference between reproduction bands of the AAC method and the HEAAC method according to Embodiment 1 of the present invention.
  • FIG. 1 is a diagram showing an example of a configuration of a bit stream transmission apparatus according to Embodiment 1 of the present invention.
  • FIG. 2 is a diagram showing an example of the configuration of the bit stream receiving apparatus according to Embodiment 1 of the
  • FIG. 5A is a diagram for explaining the meaning of the stream output regulation shown in FIG. 10 according to Embodiment 1 of the present invention.
  • FIG. 5B is a diagram for explaining the meaning of the stream output regulation shown in FIG. 10 according to Embodiment 1 of the present invention.
  • FIG. 5C is a diagram for explaining the meaning of the stream output regulation shown in FIG. 10 according to Embodiment 1 of the present invention.
  • FIG. 6 is a diagram showing an example of the configuration of the bitstream transmission / reception system according to Embodiment 2 of the present invention.
  • FIG. 7 is a diagram for explaining an example of the data configuration of the output bitstream in IEC60958 / IEC61937.
  • FIG. 8A is a diagram illustrating an example of a description of a fixed header in the ADTS format.
  • FIG. 8B is a diagram illustrating an example of a description of a LOAS format header.
  • FIG. 9 is a diagram showing a data format of the preamble signal Pc shown in FIG.
  • FIG. 10 is a diagram showing the presence / absence of a stream output regulation in the IEC 61937 standard for a combination of a sampling rate of an elementary audio stream and an audio encoded data format.
  • FIG. 11A is a diagram illustrating a frequency band in which encoded data with HEAAC and an AAC sampling rate of 48 KHz can be reproduced.
  • FIG. 11B is a diagram showing frequency bands in which encoded data with AAC and an AAC sampling rate of 48 KHz can be reproduced.
  • Embodiment 1 a bitstream transmission apparatus according to Embodiment 1 of the present invention will be described with reference to the drawings.
  • FIG. 1 is a diagram illustrating a configuration of a bitstream transmission apparatus 200 according to the first embodiment.
  • the bitstream transmission device 200 includes an input unit 100, an analysis unit 101, a preamble generation unit 102, a shaping unit 103, and an output unit 104.
  • the input unit 100 acquires an elementary audio stream 300 obtained by encoding an audio signal.
  • the analysis unit 101 analyzes the sampling rate and audio encoded data format of the acquired elementary audio stream 300.
  • the preamble generation unit 102 generates a preamble signal that constitutes an audio bitstream in a format defined by IEC 61937 according to the analysis result of the analysis unit 101.
  • the preamble generation unit 102 sets a parameter indicating the audio encoded data format of the elementary audio stream 300 in accordance with IEC 61937.
  • a preamble signal is generated by changing the value.
  • the shaping unit 103 shapes the IEC 61937 format audio bitstream by adding the preamble signal generated by the preamble generation unit 102 to the elementary audio stream 300.
  • the output unit 104 outputs the audio bitstream 301 formed by the forming unit 103.
  • FIG. 2 is a diagram illustrating an example of the configuration of the bit stream receiving apparatus according to the first embodiment.
  • the bitstream receiving apparatus 201 receives the audio bitstream 301 transmitted from the bitstream transmitting apparatus 200 illustrated in FIG. 1, and decodes the received audio bitstream 301.
  • the bit stream receiving apparatus 201 includes a preamble removing unit 202 and an elementary decoding unit 203.
  • the preamble removing unit 202 is incorporated in the bitstream receiving apparatus 201 and removes the preamble signals Pa, Pb, Pc, and Pd from the IEC61937 format audio bitstream 301 transmitted from the bitstream transmitting apparatus 200, thereby the elementary audio stream 300. Extract.
  • the elementary decoding unit 203 is built in the bitstream receiving apparatus 201, generates an audio signal (multi-channel decoding signal) by decoding the elementary audio stream 300 extracted by the preamble removing unit 202, and generates the generated audio Output a signal.
  • the elementary decoding unit 203 when decoding the elementary audio stream 300, if the audio encoded data format indicated by the preamble signal Pc and the audio encoded data format indicated by the Extension_payload contradict each other, The elementary audio stream 300 is decoded in the audio encoded data format indicated by Pc.
  • FIG. 3 is a diagram illustrating an example in which a transmission / reception system including the bit stream transmission device 200 illustrated in FIG. 1 and the bit stream reception device 201 illustrated in FIG. 2 is installed in an audio device.
  • a bit stream transmission / reception system 210 including a bit stream transmission apparatus 200 and a bit stream reception apparatus 201 is connected via a connection line that transmits an audio bit stream 301 in the IEC 61937 format.
  • This connection line is, for example, HDMI.
  • the bit stream transmission device 200 is built in, for example, the television 220, and is connected to, for example, a 2-channel stereo speaker via a decoder and a 2-channel downmix unit inside the television 220.
  • the television 220 acquires the elementary audio stream 300 from a broadcast wave or CD via an antenna, tuner, CD driver, or the like (not shown), and the acquired elementary audio stream 300 is input to the input unit 100 of the bitstream transmission device 200. input.
  • the decoder 221 takes in the elementary audio stream 300 input from the input unit 100 to the shaping unit 103 and temporarily decodes it into a multi-channel audio signal.
  • the 2-channel downmix unit 222 (2ch downmix unit) downmixes the multichannel audio signal obtained by decoding the elementary audio stream 300 with a decoder into a 2-channel stereo audio signal, and converts the stereo audio signal into Output to the stereo speaker 223.
  • the bit stream receiving device 201 is built in a theater system 230 including a multi-channel speaker 231 such as 5.1 channel, for example.
  • the bitstream receiving apparatus 201 decodes an audio bitstream 301 that is input from the bitstream transmitting apparatus 200 via HDMI or the like according to IEC61937, and a multichannel audio signal obtained by the decoding is converted into a multichannel speaker 231. Output to.
  • bitstream transmission apparatus 200 configured as described above.
  • the input unit 100 acquires the elementary audio stream 300.
  • the elementary audio stream 300 is a stream in the data format as shown in FIG. 7, and in the first embodiment, the header format is the LOAS format, and the encoded data is AAC encoded data that does not include SBR information.
  • the encoding data portion in the elementary audio stream 300 does not include the Extension_payload 310, and the sampling rate (sampling frequency) described in the header is 24 kHz.
  • the analysis unit 101 analyzes the elementary audio stream 300.
  • the input elementary audio stream 300 has a sampling rate of 24 kHz and does not include SBR information. Therefore, this is analyzed by the analysis unit 101.
  • the sampling rate can be obtained by analyzing the bit stream in accordance with the LOAS header format specification shown in FIG. 8B. Also, the presence / absence of SBR information can be obtained by analyzing the bit stream in accordance with the definition of Extension_payload shown in FIG.
  • the preamble generation unit 102 generates a preamble signal in the IEC 61937 format according to the analysis result of the analysis unit 101.
  • the preamble generation unit 102 generates a preamble signal indicating that the elementary audio stream 300 includes SBR information.
  • the preamble generation unit 102 sets the value indicated by 5 bits from 0 to the 4th bit of the preamble signal Pc to 23. Thereby, the preamble signal Pc indicates that the header format is the LOAS format.
  • the preamble generation unit 102 sets 2 bits of the 5th to 6th bits of the preamble signal Pc to 2. Accordingly, the preamble signal Pc indicates that the elementary audio stream 300 includes SBR information.
  • SBR information is included, that is, the preamble signal Pc indicates that the elementary audio stream 300 is encoded by the HEAAC method.
  • the sampling rate is set to 24 kHz, but it goes without saying that the same applies to 22.05 kHz and 16 kHz.
  • the shaping unit 103 adds the preamble signal output from the preamble generation unit 102 to the elementary audio stream 300. That is, the forming unit 103 forms an audio bit stream in the IEC 61937 format as shown in the audio bit stream 301 of FIG.
  • the output unit 104 outputs an audio bitstream 301 that is a signal from the shaping unit 103 to an external device.
  • bitstream receiving apparatus 201 configured as shown in FIG. 2 will be described below.
  • the bit stream transmission device 200 forms the input elementary audio stream 300 into an audio bit stream 301 in the IEC 61937 format, and outputs the audio bit stream 301.
  • sampling rate (sampling frequency) of the input elementary audio stream 300 is 24 kHz and encoding is performed without SBR information (AAC method)
  • SBR information is included in Pc in the preamble signal.
  • a code indicating a certain (HEAAC system) is described.
  • Pc in the preamble signal has no SBR information (AAC system) ) Is indicated.
  • the preamble removal unit 202 extracts the elementary audio stream 300 by removing the preamble signals Pa, Pb, Pc, and Pd from the IEC 61937 format audio bit stream 301 transmitted from the bit stream transmission apparatus 1000. If a stuffing signal is included in the audio bit stream 301 in the IEC 61937 format, the preamble removal unit 202 also removes the stuffing signal and generates an elementary audio stream 300.
  • the elementary audio stream 300 generated in this way is an AAC or HEAAC elementary audio stream, and can be decoded according to a decoding procedure defined by the MPEG standard. Further, the preamble removing unit 202 detects SBR presence / absence information indicating the presence / absence of SBR information from the preamble signal Pc, and sends the SBR presence / absence information to the subsequent elementary decoding unit 203.
  • the elementary decoding unit 203 generates an audio signal by decoding the extracted elementary audio stream 300. Further, the elementary decoding unit 203 refers to the SBR presence / absence information sent from the preamble removal unit 202, information indicating the presence / absence of SBR information included in the elementary audio stream 300, and the SBR from the preamble removal unit 202. It is determined whether the presence / absence information contradicts, and if there is a conflict, the content indicated by the SBR presence / absence information from the preamble removal unit 202 is followed.
  • the elementary decoding unit 203 performs the band expansion process. To implement. Of course, since there is actually no SBR information in the Extension_payload of the elementary audio stream 300, the elementary decoding unit 203 cannot perform complete band expansion processing. For example, the sampling rate of the decoded signal is upsampled to twice. The process of performing the process to perform is performed. That is, the elementary decoding unit 203 performs a process equivalent to performing a band expansion process such that the component replicated in the high band by the SBR is zero.
  • the elementary decoding unit 203 Do not perform the enlargement process. For example, the elementary decoding unit 203 skips and ignores SBR information that actually exists. Alternatively, the elementary decoding unit 203 performs processing such as applying the SBR information that actually exists, but downsampling the output sampling rate to 1 ⁇ 2, and generating a 48 kHz signal as a result. .
  • the elementary decoding unit 203 adds to the elementary audio stream 300 when the information indicating the presence / absence of the SBR information included in the elementary audio stream 300 and the SBR presence / absence information from the preamble removing unit 202 contradict each other. Information indicating the presence or absence of the included SBR information may be followed.
  • the decoded signal generated in this way is transmitted to the outside from the elementary decoding unit 203 and is converted into an audible signal using a speaker or headphones.
  • the bitstream transmission apparatus 200 includes the input unit 100 that acquires an elementary audio stream obtained by encoding an audio signal, the sampling frequency of the elementary audio stream, and the audio encoding.
  • An analysis unit 101 that analyzes the data format
  • a preamble generation unit 102 that generates a preamble signal that constitutes an audio bitstream in IEC 61937 format according to the analysis result of the analysis unit 101, and a preamble signal generated by the preamble generation unit 102
  • a forming unit 103 that forms an audio bit stream in the IEC 61937 format and an output unit 104 that outputs the audio bit stream formed by the forming unit 103 are provided.
  • the preamble generation unit 102 conforms the parameter indicating the audio encoded data format of the elementary audio stream to the IEC 61937 of the audio bit stream. Change the format to generate a preamble signal.
  • the bit stream transmitting apparatus 200 can transmit the audio bit stream 301 that could not be transmitted to the bit stream receiving apparatus 201 because it does not conform to IEC 61937 without any problem.
  • the bitstream transmission apparatus 200 can obtain the audio bitstream 301 within the range of the IEC61937 standard even if the combination of the sampling rate of the elementary audio stream 300 and the audio encoded data format is outside the range of the IEC61937 standard.
  • it can be implemented by changing only the presence / absence of SBR information described in the preamble signal, so the processing is very simple.
  • the sampling rate described in the header is 24 kHz (or 22.05 kHz, 16 kHz) and “no SBR information” has been described, but the sampling rate described in the header is 44.1 kHz.
  • the same processing can be performed when “SBR information exists” at (or 32 kHz). The operation in that case is as follows.
  • the analysis unit 101 analyzes the sampling rate of the elementary audio stream 300 and the audio encoded data format. As described above, the analysis unit 101 analyzes that the input elementary audio stream 300 has a sampling rate of 44.1 kHz and includes SBR information.
  • the preamble generation unit 102 generates a preamble signal included in the IEC 61937 format audio bitstream 301 according to the analysis result of the analysis unit 101.
  • the sampling rate of the elementary audio stream 300 is 44.1 kHz and SBR information is included
  • an audio bit stream in the IEC61937 format is not defined as shown in FIG.
  • the preamble generation unit 102 sets the value indicated by 5 bits from 0 to the 4th bit of the preamble signal Pc to 23. Thereby, the preamble signal Pc indicates that the header format is the LOAS format.
  • the preamble generation unit 102 sets 2 bits of the 5th to 6th bits of the preamble signal Pc to 1. As a result, the preamble signal Pc indicates that no SBR information is included. That is, the preamble signal Pc indicates that the audio encoded data format of the elementary audio stream 300 is the AAC format.
  • the shaping unit 103 adds the preamble signal output from the preamble generation unit 102 to the elementary audio stream 300. That is, the forming unit 103 forms the audio bit stream 301 in the IEC61937 format as shown in FIG.
  • the output unit 104 outputs the audio bitstream 301 formed by the forming unit 103 to an external device.
  • the bit stream transmitting apparatus 200 can output as the audio bit stream 301 within the range of the IEC 61937 standard even if the input elementary audio stream 300 is outside the range of the IEC 61937 standard.
  • the SBR information is forcibly changed as described above, the information indicating the presence or absence of SBR included in the preamble signal and the information indicating the presence or absence of SBR included in the encoded data become inconsistent. In the case of inconsistency, it may be determined in advance so that processing is performed according to information indicating the presence or absence of SBR included in the preamble signal. As described above, since the AAC elementary audio stream and the HEAAC elementary audio stream are compatible with each other, even if the inconsistent IEC 61937 format audio bit stream is used, the external receiver can reproduce the stream. is there.
  • FIGS. 4A and 4B The concept is shown in FIGS. 4A and 4B. 4A (a) to (b2) and FIGS. 4B (a) to (b2), the horizontal axis represents frequency.
  • FIG. 4A (a) schematically shows frequency components included in the elementary audio stream 300 encoded by HEAAC in the frequency spectrum.
  • a signal indicated by a solid line lower than 1 ⁇ 4 of the sampling frequency is encoded by the AAC method, and a signal indicated by a broken line higher than 1 ⁇ 4 of the sampling frequency is indicated by the SBR method. It is encoded with.
  • FIG. 4A (b1) shows frequency components when the HEAAC signal shown in FIG. 4A (a) is processed by the HEAAC decoder. In this case, a signal of the entire band including both the low frequency band and the high frequency band is reproduced.
  • FIG. 4A (b2) shows frequency components when the HEAAC signal shown in FIG. 4A (a) is processed by the AAC decoder.
  • the high frequency band encoded by the SBR method is not decoded, and only the low frequency band signal encoded by the AAC method is decoded and reproduced by the AAC decoder.
  • FIG. 4B (a) schematically shows frequency components included in the elementary audio stream 300 encoded by AAC using a frequency spectrum. In this case, the entire band is encoded by the AAC method.
  • FIG. 4B (b1) shows frequency components when the AAC signal shown in FIG. 4B (a) is processed by the HEAAC decoder. In this case, the entire band signal is decoded by the HEAAC decoder and reproduced.
  • FIG. 4B (b2) shows frequency components when the AAC signal shown in FIG. 4B (a) is processed by the AAC decoder. Also in this case, as in the case shown in FIG. 4B (b1), the signal of the entire band is decoded by the AAC decoder and reproduced.
  • the preamble audio signal causes the elementary audio stream 300 to be AAC.
  • the elementary audio stream 300 is processed by the AAC decoder. Even in such a case, the audible audio decoded by the AAC is reproduced until the same sound quality as that obtained by the original HEAAC is not obtained (FIG. 4A (b2)).
  • this AAC signal is processed by HEAAC decoding without any problem. That is, if this AAC signal is processed by HEAAC decoding, the same sound quality as that obtained by decoding by the original AAC can be obtained (FIG. 4B (b2)).
  • the sampling rate described in the header is 24 kHz (or 22.05 kHz, 16 kHz) and there is no SBR information” and “the sampling rate described in the header is 44.1 kHz (or 32 kHz).
  • the configuration that solves the first problem has been described using the example of “with SBR information”, but the same processing as described above is performed when “the sampling rate described in the header is 48 kHz and there is SBR information”.
  • the second problem can be solved. In the following, the processing in the case of “the sampling rate described in the header is 48 kHz and there is SBR information” will be described in detail.
  • the analysis unit 101 analyzes the sampling rate of the elementary audio stream 300 and the audio encoded data format.
  • the analysis unit 101 analyzes that the input elementary audio stream 300 has a sampling rate of 48 kHz and includes SBR information.
  • the preamble generation unit 102 generates a preamble signal in IEC 61937 format according to the analysis result of the analysis unit 101.
  • the sampling rate is 48 kHz, as shown in FIG. 10, an audio bit stream in the IEC 61937 format is defined regardless of whether the SBR information is included or not.
  • preamble generation section 102 of the present embodiment always generates a preamble signal indicating that it does not include SBR information, even when it includes SBR information.
  • the preamble generation unit 102 sets the value indicated by 5 bits from 0 to 4 of the preamble signal Pc to 23. Thereby, the preamble signal Pc indicates that the header format is the LOAS format.
  • the preamble generation unit 102 sets 2 bits of the 5th to 6th bits of the preamble signal Pc to 1. Thereby, the preamble signal Pc indicates that the elementary audio stream 300 does not include SBR information. That is, the preamble signal Pc generates a preamble signal indicating that the elementary audio stream 300 is encoded by the AAC method whenever the sampling rate is 48 kHz.
  • the shaping unit 103 adds the preamble signal generated by the preamble generation unit 102 to the elementary audio stream 300. That is, the forming unit 103 forms the audio bit stream 301 in the IEC61937 format as shown in FIG.
  • the output unit 104 outputs the audio bitstream 301 generated by the shaping unit 103 to an external device.
  • the program content part is broadcast with an audio encoded data format of HEAAC and an AAC sampling rate of 48 KHz
  • the commercial part is an audio encoded data format of AACLC and AACLC
  • the bit stream transmission apparatus outputs a signal at an IEC60958 frame rate of 96 KHz in the program content portion, and outputs a signal at a frame rate of 48 KHz of IEC60958 in the commercial portion.
  • the bitstream receiving apparatus 201 has problems such as sound skipping due to the time required to follow the change in the IEC60958 frame rate. It can be avoided.
  • FIGS. 5A to 5C are diagrams for explaining an example of stream transmission based on the stream output rule shown in FIG.
  • the circles with the letters a, b, c and d indicate the preamble signals Pa, Pb, Pc and Pd
  • the hatched circles indicate the elementary audio streams
  • the circles indicate the data length.
  • the padding data which is invalid data for adjusting the value, is shown.
  • the header format of the stream transmitted here is assumed to be the LOAS format.
  • FIG. 5A is a diagram illustrating a reason why a stream that is AAC encoded (without SBR information) at a sampling rate of 48 kHz can be transmitted, for example.
  • the decoder In contrast, in the case of 48 kHz AAC, the decoder generates PCM data every 21.333 msec. Therefore, when the signal supply rate matches the processing rate of the decoder, the decoder can process the signal without contradiction.
  • FIG. 5B is a diagram illustrating the reason why a stream that is AAC encoded (no SBR information) at a sampling rate of 24 kHz cannot be transmitted, for example.
  • the decoder since the decoder generates PCM data for 42.6667 msec for the signal supplied every 21.333 msec (since 1024 samples are 42.6667 msec at 24 kHz), the bit rate with respect to the processing speed of the decoder Supply of signals from the stream transmission device becomes excessive. As a result, the stream overflows.
  • FIG. 5C is a diagram illustrating a reason why a stream that is HEAAC encoded (with SBR) at a sampling rate of 24 kHz can be transmitted, for example.
  • the bitstream transmission apparatus regards the entire stream as a signal with a sampling rate of 48 kHz.
  • the decoder in the case of 24 kHz HEAAC, the decoder generates PCM data every 42.6667 msec, so that the signal supply rate matches the processing rate of the decoder. Therefore, the decoder can process the signal without contradiction.
  • both the AAC-encoded stream and the HEAAC-encoded stream can be transmitted without problems at a sampling rate of 48 kHz.
  • the decoder In contrast, in the case of 48 kHz AAC, the decoder generates PCM data every 21.333 msec, so that the signal supply rate and the decoder processing rate match. Therefore, the decoder can process the signal without contradiction.
  • the decoder in the case of 48 kHz HEAAC, the decoder generates PCM data every 21.333 msec, so that the signal supply rate matches the decoder processing rate. Therefore, the decoder can process the signal without contradiction.
  • the elementary audio stream is encoded at the sampling rate of 48 kHz, it is possible to transmit the AAC or HEAAC without any problem.
  • a stream that is AAC encoded at a sampling rate of 48 kHz and a stream that is HEAAC encoded at a sampling rate of 48 kHz are switched, a stream having a transmission rate of 1536 kbps and a stream having a transmission rate of 3072 kbps are switched. become.
  • a process of re-synchronizing such as switching the operating frequency of the A / D converter is required. Since it takes time to re-synchronize the entire bit stream transmission / reception system, a time lag occurs when the sampling rate is switched. For example, there may be a problem that the sound is interrupted at the joint between the main program and the CM.
  • the transmission rate can be set to a constant sampling rate. This makes it possible to prevent problems such as sound skipping.
  • the bit stream transmission / reception system generates a time lag when the sampling rate is switched. Therefore, when the sampling rate of the elementary audio stream is 48 kHz, the elementary audio stream is encoded with HEAAC.
  • the present invention is not limited to this. However, the present invention is not limited to this. For example, if the time lag that occurs when the sampling rate is switched is not concerned, the bitstream transmission / reception system may perform processing assuming that the elementary audio stream is always a HEAAC signal.
  • FIG. 6 is a diagram showing a configuration of the bit stream transmission / reception system in the second embodiment.
  • the bitstream transmission / reception system 210 according to the second embodiment includes a bitstream transmission apparatus 1000 and a bitstream reception apparatus 1001.
  • the bitstream transmission apparatus 1000 includes an input unit 100, an analysis unit 101, a shaping unit 103, an output unit 104, and a preamble generation unit 1010.
  • the processing units denoted by the same reference numerals as the processing units of the bitstream transmission apparatus 200 are the same as those described in FIG.
  • the preamble generation unit 1010 will be mainly described.
  • the preamble generation unit 1010 receives the capability information of the bit stream reception device 1001 from the bit stream reception device 1001, and in accordance with the received capability information, converts the audio encoded data format of the elementary audio stream included in the preamble signal Pc. Change the information shown. Specifically, the preamble generation unit 1010 has the capability of the bit stream reception device 1001 to decode the elementary audio stream 300 encoded by HEAAC at a sampling rate of 48 kHz based on the capability information received from the bit stream reception device 1001. Judge whether there is.
  • the preamble generation unit 1010 When it is determined that the bitstream receiving apparatus 1001 has the ability to decode the elementary audio stream 300 encoded by HEAAC at a sampling rate of 48 kHz, the preamble generation unit 1010 is different from the first embodiment, When the actual elementary audio stream 300 is encoded by HEAAC at a sampling rate of 48 kHz, a preamble signal Pc indicating that it is encoded by HEAAC is generated. Specifically, the preamble generation unit 1010 sets the value indicated by the 5th bit from 0 to the 4th bit of the preamble signal Pc to 23. Thereby, the preamble signal Pc indicates that the header format is the LOAS format.
  • the preamble generation unit 1010 sets 2 bits of the 5th to 6th bits of the preamble signal Pc to 2. Accordingly, the preamble signal Pc indicates that the elementary audio stream 300 includes SBR information. That is, the preamble signal Pc indicates that the elementary audio stream 300 is encoded by the HEAAC method.
  • the bitstream reception apparatus 1001 receives the audio bitstream 301 transmitted from the bitstream transmission apparatus 1000 and decodes the received audio bitstream 301.
  • the bitstream receiving apparatus 1001 includes a preamble removing unit 202, an elementary decoding unit 203, and a capability information notification unit 1011.
  • the processing units denoted by the same reference numerals as the processing units of the bitstream receiving apparatus 201 are the same as those described in FIG. .
  • the capability information notification unit 1011 will be mainly described.
  • the capability information notification unit 1011 stores capability information indicating whether or not the elementary decoding unit 203 in the bitstream receiving apparatus 1001 can decode the HEAAC-encoded elementary audio stream 300 at a sampling rate of 48 kHz. I remember it. When there is a capability information transmission request from the bitstream transmission apparatus 1000, the capability information notification unit 1011 notifies the preamble generation unit 1010 of the bitstream transmission apparatus 1000 of the capability information stored in the memory.
  • the bitstream transmission apparatus 1000 has the ability to decode the HEAAC-encoded elementary audio stream at the sampling rate of 48 kHz when the elementary decoding unit 203 of the bitstream reception apparatus 1001 has the capability of decoding. Even when the sampling rate of the elementary audio stream 300 is 48 kHz, a parameter indicating the presence of SBR information can be described in the preamble signal Pc when it is encoded by HEAAC. Therefore, when the problem that the sound is interrupted at the joint between the content encoded with AAC and the content encoded with HEAAC does not become a problem, the bit stream reception device 1001 transmits the bit stream from the bit stream transmission device 1000.
  • the elementary audio stream 300 can be decoded in accordance with the preamble signal included in the audio bit stream 301 thus obtained. Thereby, there is an effect that the user can enjoy the content encoded by HEAAC with high sound quality that is band-extended to a high frequency range.
  • the bitstream receiving apparatus 1001 Even when the elementary decoding unit 203 of the bitstream receiving apparatus 1001 has a capability of decoding a stream encoded by HEAAC with a sampling rate of 48 kHz, the bitstream receiving apparatus 1001 dares to send the bitstream transmitting apparatus 1000 to the bitstream transmitting apparatus 1000. However, it is not necessary to notify the ability information. In this case, for example, the bitstream receiving apparatus 1001 interprets the header and the Extension_payload of the elementary audio stream 300 extracted from the audio bitstream 301 received from the bitstream transmitting apparatus 200 of Embodiment 1, and the elementary audio stream When SBR information is included in 300, the elementary audio stream 300 may be decoded according to the SBR information. Furthermore, even when the SBR information is not included in the elementary audio stream 300 extracted from the audio bitstream 301, the bitstream reception device 1001 may perform HEAAC decoding that extends the bandwidth to the high frequency range. .
  • the preamble generation unit 1010 uses the elementary signal as information indicating the encoding format in the preamble signal.
  • An encoding format in which the SBR information is not included in the audio stream is described.
  • the program content part is broadcast with an audio encoded data format of HEAAC and an AAC sampling rate of 48 KHz, while the commercial part has an audio encoded data format of AACLC and AAC. Even when the sampling rate is broadcast at 48 KHz, the sampling rate of the final decoded signal does not need to fluctuate. Therefore, the switching portion between the program content and the CM portion smoothly transitions.
  • the bit stream receiving device 1001 A high-quality audio signal decoded by HEAAC can be reproduced.
  • the bit stream transmission / reception system can reduce the influence of a bad reception state.
  • preamble removing section 202 extracts SBR presence / absence information and sends the information to elementary decoding section 203.
  • the sampling rate indicated by elementary audio stream 300 is not changed. In the case of 16 kHz to 24 kHz, the bit stream receiving apparatus may always decode the elementary audio stream 300 on the premise that “SBR information is present”. Conversely, when the sampling rate indicated by the elementary audio stream 300 is 32 kHz to 48 kHz, the bit stream receiving device may always decode the elementary audio stream 300 on the premise of “no SBR information”.
  • bitstream transmission apparatus and the bitstream transmission / reception system according to the embodiment of the present invention have been described above, but the present invention is not limited to this embodiment.
  • each processing unit included in the bit stream transmission apparatus or the bit stream transmission / reception system according to the above embodiment is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them.
  • bitstream transmission apparatus or the bitstream transmission / reception system according to the embodiment of the present invention may be realized by a processor such as a CPU executing a program.
  • the present invention may be the above program or a non-transitory computer-readable recording medium on which the above program is recorded.
  • the program can be distributed via a transmission medium such as the Internet.
  • bitstream transmission device the bitstream transmission / reception system, and their modifications according to the first and second embodiments may be combined.
  • division of functional blocks in the block diagram is an example, and a plurality of functional blocks can be realized as one functional block, a single functional block can be divided into a plurality of functions, or some functions can be transferred to other functional blocks. May be.
  • functions of a plurality of functional blocks having similar functions may be processed in parallel or time-division by a single hardware or software.
  • the bitstream transmitting apparatus includes means for changing information regarding the presence or absence of SBR information, even if a bitstream not defined in the IEC61937 standard is input, the bitstream using the IEC61937 standard is used. Stream can be sent. Therefore, the present invention can be applied to a wide range of DTV broadcast receivers and playback devices that read out and play back signals from recording media storing audio encoded signals. In addition, the present invention can suppress a change in sampling rate at the time of switching contents with different audio encoded data formats, so that it is possible to enjoy good reproduced sound without interruption.

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Abstract

Un dispositif de transmission de flux binaire (200) selon la présente invention comprend : une unité d'entrée (100) qui acquiert un flux audio élémentaire obtenu par codage d'un signal audio ; une unité d'analyse (101) pour analyser la fréquence d'échantillonnage et la forme de codage du flux audio élémentaire (300) ; une unité de génération de préambule (102) qui, si la fréquence d'échantillonnage et la forme de codage analysées ne sont pas conformes à une norme, génère un signal de préambule décrivant une forme de codage qui est conforme à la norme à titre d'informations indiquant la forme de codage pour le flux audio élémentaire (300) ; et une unité de formation (103) pour former un flux binaire audio (301) en conformité avec la norme, par incorporation du signal de préambule généré dans le flux audio élémentaire (300).
PCT/JP2012/003205 2011-05-20 2012-05-16 Dispositif de transmission de flux binaire, système de transmission/réception de flux binaire, dispositif de réception de flux binaire, procédé de transmission de flux binaire, procédé de réception de flux binaire et flux binaire WO2012160782A1 (fr)

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CN201280023907.9A CN103620678B (zh) 2011-05-20 2012-05-16 比特流发送装置及方法、比特流收发系统、比特流接收装置及方法、以及比特流
EP12788834.5A EP2711924B1 (fr) 2011-05-20 2012-05-16 Dispositif de transmission de flux binaire, système de transmission/réception de flux binaire, dispositif de réception de flux binaire, procédé de transmission de flux binaire, procédé de réception de flux binaire et flux binaire
JP2013516194A JP5843856B2 (ja) 2011-05-20 2012-05-16 ビットストリーム送信装置、ビットストリーム送受信システム、ビットストリーム受信装置、ビットストリーム送信方法及びビットストリーム受信方法

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EP2711924A4 (fr) 2015-04-01
CN103620678B (zh) 2015-08-19
JPWO2012160782A1 (ja) 2014-07-31
EP2711924A1 (fr) 2014-03-26
EP2711924B1 (fr) 2018-11-14
CN103620678A (zh) 2014-03-05

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