CN103620678B

CN103620678B - Bit stream dispensing device and method, bit stream receive-transmit system, bit stream receiving trap and method and bit stream

Info

Publication number: CN103620678B
Application number: CN201280023907.9A
Authority: CN
Inventors: 西尾孝祐; 宫阪修二
Original assignee: Socionext Inc
Current assignee: Socionext Inc
Priority date: 2011-05-20
Filing date: 2012-05-16
Publication date: 2015-08-19
Anticipated expiration: 2032-05-16
Also published as: JPWO2012160782A1; WO2012160782A1; EP2711924A4; EP2711924B1; EP2711924A1; CN103620678A; JP5843856B2

Abstract

The bit stream dispensing device (200) that the present invention relates to possesses: input part (100), obtains the elementary audio stream obtained coding audio signal; Analysis portion (101), analyzes sampling frequency and the coding form of basic audio stream (300); Targeting signal generating unit (102), under the sampling frequency analyzed and the non-compliant situation of coding form, generate the targeting signal standard compliant coding form recorded as the information of the coding form that elementary audio stream (300) is shown; And forming portion (103), the targeting signal of generation is added to elementary audio stream (300), thus forms the audio bitstream (301) of standard.

Description

Bit stream dispensing device and method, bit stream receive-transmit system, bit stream receiving trap and method and bit stream

Technical field

The present invention relates to, the device possessed to other sends by the bit stream dispensing device of the sound signal of compressed encoding and receives the bit stream receive-transmit system that the sound signal sent from this bit stream dispensing device carrys out the receiving trap of output audio.

Background technology

In the past, a kind of data regeneration device is known, this data regeneration device, by by compressed encoding and the vision signal of record and sound signal read from the recording medium of CD-ROM, DVD-ROM, semiconductor memory and hard disk etc., by the vision signal that reads and audio signal decoding (expansion) exporting.And the data be expanded are sent to the video monitor be connected with this data regeneration device and sound speaker etc. by data regeneration device.Accordingly, the regeneration of video and audio frequency is realized.Further, when reproducing digital is broadcasted, data regeneration device, receives by the vision signal of compressed encoding and sound signal, same with the regeneration from recording medium, will be exported by the vision signal of compressed encoding and audio signal decoding.Accordingly, the regeneration of video and audio frequency is realized.

About the compressed encoding of vision signal and sound signal, specify many standards.

Such as, for the prime example of coded image data standard, MPEG-2 and MPEG-4 etc. can be enumerated.

And, for the prime example of audio data coding standard, Dolby Digital, DTS (Digital Theater System), MPEG Audio and MPEG-4AAC (Adavanced Audio Coding) etc. can be enumerated.Further, for audio data coding standard, PCM (the Pulse Code Modulation) mode etc. of not cutting down quantity of information can be enumerated.

Dolby Digital is the registered trademark of Dolby company of the U.S..

DTS is the registered trademark of Digltal Theater System company of the U.S..

After, be called in such audio data coding mode " elementary audio stream " by the signal of encoding.

Further, can while elementary audio stream being decoded by data regeneration device, external device exports this elementary audio stream.

Such as, utilize S/PDIF (Sony Philips Digital InterFace) or HDMI (High-Definition Multimedia Interface), digital television is connected with AV receiver.Accordingly, according to IEC60958/IEC61937, elementary audio stream can be transmitted from digital television to AV receiver.

AV receiver, decodes the elementary audio stream of reception and exports, thus realizing the regeneration of sound signal.

Fig. 7 is the figure of an example of the data structure of the output bit flow that IEC60958/IEC61937 is shown.Fig. 7 (a) illustrates, an example of the data structure of the elementary audio stream of IEC60958/IEC61937 defined.Fig. 7 (b) illustrates, for transmitting an example of the data structure of the audio bitstream of elementary audio stream.

As shown in Fig. 7 (a), elementary audio stream 300, comprises multiple using the frame of unit as the sample (such as, 1024 samples) comprising stated number.Each frame, comprises head (Header) and coded data portion (EncodedData).In coded data, portion records, and the coded signal of actual sound, record at head, the attribute of the coded signal that coded data portion records, such as, records sampling rate and port number etc.

Form to the attribute of head record coding signal has, so-called ADTS (Audio DataTransport Stream) form and so-called LOAS (Low Overhead Audio Stream) form.Fig. 8 A and Fig. 8 B is the figure of an example of the data mode of the head of the bit stream that IEC60958/IEC61937 is shown.Fig. 8 A illustrates an example of the description of the fixing head of ADTS form.Fig. 8 A table from eighth row, illustrate for the form of the sampling frequency of ADTS description encoding signal.At this, specify the sampling frequency selecting coded signal from 0x3 to 0x8.Fig. 8 B illustrates an example of the description of the head of LOAS form.As shown in Figure 8 B, in LOAS form, be also defined in the form of the sampling frequency of head description encoding signal.

For the coded system of the coded signal that the coded data portion of the elementary audio stream 300 of Fig. 7 (a) records, the mpeg audio AAC mode and HEAAC (High-Efficiency Advanced Audio Coding) mode etc. of known is international standard specifications.HEAAC mode refers to, AAC mode is suitable for the mode of the band spreading technique of so-called SBR (Spectral Band Replication: spectral band replication).Further, HEAAC mode, if dare to not process SBR information, or, be originally the demoder that can not process SBR information, then can carry out that there is the regeneration process with the compatibility of AAC.

By the information in analysis of encoding data portion, thus can judge that whether the coded signal that describes in described coded data portion is be suitable for SBR technology and by the signal of encoding.That is, by checking the bit structure of the dotted line frame in the elementary audio stream 300 of Fig. 7 (a), thus described analysis can be carried out.Dotted line frame is the information storage construct of the so-called Extension_payload of AAC standard.Whether deposit SBR information according in this Extension_payload, thus can judge whether SBR technology has been suitable for coded signal.In elementary audio stream 300, Extension_payload is configured in the last of each frame, but, might not need to there is Extension_payload at each frame.

As shown in Fig. 7 (b), audio bitstream 301 is, IEC61937 form audio bit stream.IEC61937 form audio bit stream is, with the addition of the targeting signal of so-called Pa, Pb, Pc and Pd before elementary audio stream.And then, after elementary audio stream, have insert so-called Stuffing, for the situation of the invalid signals of conditioning signal length.

Fig. 9 is the figure of the data mode that the targeting signal Pc shown in Fig. 7 (b) is shown.Shown in Fig. 9 with dotted line around part be, in targeting signal Pc, with LOAS form, record the part of an example of the data of the presence or absence (signal of AAC or HEAAC is shown) of SBR information.Such as, when the value shown in 5 positions of the 0th to the 4th of targeting signal Pc is 23, this elementary audio stream 300 is LOAS forms.And then, when the value shown in two positions of the 5th to the 6th of targeting signal Pc is 1, illustrates in this elementary audio stream and do not comprise SBR information.That is, the coded signal that coded data portion records is shown, is encoded with AACLC mode or AAC mode.Further, when the value shown in 5 positions of the 0th to the 4th of targeting signal Pc is 23 and the value shown in two positions of the 5th of targeting signal Pc the to the 6th is 2, illustrates in elementary audio stream 300 and comprise SBR information.That is, the coded signal that coded data portion records is shown, is encoded in HEAAC mode.

And, make use of the bit stream dispensing device of described technology, when have received the elementary audio stream as elementary audio stream 300, detecting the presence or absence of SBR information according to the Extension_payload of this elementary audio stream.And bit stream dispensing device, when not having SBR information, in targeting signal Pc, the position structure according to Fig. 9, specifies AAC.On the other hand, when there is SBR information in Extension_payload, HEAAC specified by bit stream dispensing device.For other targeting signal Pa, Pb and Pd separately, the regulation of implication according to its structure and signal sets.And, insert Stuffing as required, thus generate the audio bitstream of IEC61937 form.

(prior art document)

(non-patent literature)

Non-patent literature 1:IEC61937-11Digital audio-Interface for non-linear PCM encoded audio bitstreams applying IEC60958-Part11:MPEG-4AAC and its extensions in LATM/LOAS

Non-patent literature 2:ISO/IEC14496-3Information technology-Coding of audio-visual objects-Part3:Audio

Non-patent literature 3:ETSI TS101154Technical Specification DigitalVideo Broadcasting (DVB); Specification for the use of Video andAudio Coding in Broadcasting Applications based on the MPEG-2Transport Stream

Brief summary of the invention

The problem that invention will solve

But, in described conventional art, there is two problems.

First problem is, has in the parameter defined with MEPG-4AAC, does not define the parameter of bit stream standard.Figure 10 illustrates, the sampling rate of elementary audio stream and the figure to the relation of the coded audio data form of the voice data that this sampling rate can be selected.

As Figure 10 illustrates, when AAC sampling rate is 16kHz, 22.05kHz, 24kHz and coded audio data form is AAC, do not define bit stream standard (Figure 10 from upper 1 to 3 row).Further, when AAC sampling rate is 32kHz, 44.1kHz and coded audio data form is HEAAC (addition of SBR information in AAC coded signal), bit stream standard (the 4 to 5 row of Figure 10) is not defined.Particularly, when the latter, i.e. AAC sampling rate are 32kHz, 44.1kHz and coded audio data form is HEAAC, although the utilization of regulation digital broadcasting etc., do not define bit stream standard.Its result is, Problems existing is, utilizes HEAAC and the elementary audio stream of high tone quality of encoding even if having received, and the regeneration such as Multi-channel loudspeaker system of this elementary audio stream by outside can not be enjoyed.

Second Problem is, such as, when comprising the different coded data of coded audio data form in same content, the switching of the output sampling frequency in output bit flow increases.

Such as, in digital broadcasting., for program content portions, with coded audio data form for HEAAC and AAC sampling rate play for 48KHz, on the other hand, for advertisement part, with coded audio data form for AACLC and AAC sampling rate for 48KHz play when, cut for part at program content portions and advertisement part, the switching of output sampling frequency occurs.

Figure 11 A and Figure 11 B illustrates, the different figure of the frequency band that HEAAC decoders decode also regenerates and the frequency band that AAC decoders decode also regenerates.Figure 11 A illustrates, HEAAC and AAC sampling rate are the reproducible frequency band of the coded data of 48KHz.HEAAC, to the signal of the frequency band of AAC regeneration, utilizes SBR technology (Spectral Band Replication), thus the signal of the frequency band of the twice of regeneration AAC.That is, the bold portion of Figure 11 A illustrates, the signal of 0 to the 24kHz regenerated by the AAC of 48kHz, and the frequency band of 24 to the 48kHz of dotted portion illustrates, by the frequency band of SBR technological expansion.Accordingly, the signal of 96kHz is regenerated.On the other hand, Figure 11 B illustrates, AAC and AAC sampling rate are the frequency band of the coded data regeneration of 48KHz.As Figure 11 B illustrates, generate the signal of the frequency band identical with the frequency band that AAC portion in HEAAC regenerates.

Learn according to Figure 11 A and Figure 11 B, at program content portions, the frame per second exporting IEC60958 is the signal of 96KHz, and at advertisement part, the frame per second exporting IEC60958 is the signal of 48KHz.When receiving such bit stream, the change of the frame per second of the IEC60958 responding the bit stream that AV receiver receives is needed again to obtain synchronous process.And this process needs spended time, therefore, Problems existing is, produces sound and be interrupted in the switching of Program sections and advertisement part.

Summary of the invention

So, the object of the present invention is to provide a kind of bit stream dispensing device, even if when the form that the coding form of the reality corresponding with sampling frequency is against regulation, also can send as the audio bitstream be applicable to.

The means of dealing with problems

In order to solve described problem, the bit stream dispensing device that one embodiment of the present invention relates to, send the audio bitstream of the form of regulation, described bit stream dispensing device possesses: input part, obtains the elementary audio stream obtained coding audio signal; Analysis portion, analyzes sampling frequency and the coding form of described elementary audio stream; Targeting signal generating unit, according to the analysis result of described analysis portion, generates the targeting signal comprising the information of the coding form that described elementary audio stream is shown; Forming portion, is added to described elementary audio stream by the described targeting signal that described targeting signal generating unit generates, thus forms the audio bitstream of the form of described regulation; And efferent, export the described audio bitstream formed by described forming portion, described targeting signal generating unit, the described sampling frequency obtained according to the analysis result according to described analysis portion and described coding form, to the coding form of the form of the described regulation of described audio bitstream be met and the different coding form of the coding form obtained from the analysis result according to described elementary audio stream, record as the information that described coding form is shown in described targeting signal.

So, targeting signal generating unit, the described sampling frequency obtained according to the analysis result according to described analysis portion and described coding form, to the coding form of the form of the described regulation of described audio bitstream be met and the different coding form of the coding form obtained from the analysis result according to described elementary audio stream, record as the information that described coding form is shown in described targeting signal.Accordingly, the bit stream dispensing device that one embodiment of the present invention relates to, even if when the form that the coding form of the reality corresponding with sampling frequency is against regulation, also can send as the audio bitstream be applicable to.

Further, also can be, described targeting signal generating unit, in the mode of output transmission speed in prespecified scope of the data exported from described efferent, record the information that described coding form is shown in described targeting signal.

At this, " prespecified scope " refers to, such as, 1536kbps and 1411.2kbps and 1024kbps is the bit rate that standard can be transmitted.Accordingly, the bit stream dispensing device that one embodiment of the present invention relates to, can make according to the sampling frequency of elementary audio stream and coding form and the output transmission speed of the audio bitstream determined, become the transmission speed that can transmit.

And, also can be, the audio bitstream of the form of described regulation is the audio bitstream of IEC61937 prescribed by standard, the described sampling frequency obtained at the analysis result according to described analysis portion is prespecified first frequency, in the described coding form corresponding with described first frequency when the corresponding scope of described IEC61937 standard is outer, described targeting signal generating unit, by coding forms different from analyzed described coding form for the presence or absence this point of the spectral band replication information in described elementary audio stream, as illustrating that the information of described coding form is recorded, thus generate described audio bitstream and become targeting signal in the corresponding scope of IEC61937 standard.

Accordingly, the bit stream dispensing device that one embodiment of the present invention relates to, the described sampling frequency obtained at the analysis result according to described analysis portion and described coding form do not meet the form of described regulation of described audio bitstream, only change the presence or absence of the SBR information of targeting signal, just can form the audio bitstream of the form conformed with the regulations.Therefore, this bit stream dispensing device, with few processing load, can generate and send the audio bitstream of the form conformed with the regulations.

And, also can be, described targeting signal generating unit, further, the described sampling frequency obtained at the analysis result according to described analysis portion is prespecified second frequency, described elementary audio stream, is recorded as the information that described coding form is shown in described targeting signal by the situation of encoding not comprise the coding form of described spectral band replication information.

Accordingly, the bit stream dispensing device that one embodiment of the present invention relates to, when being second frequency according to the sampling frequency of elementary audio stream, described elementary audio stream, can be recorded as the information that described coding form is shown in described targeting signal by the situation of encoding not comprise the coding form of described spectral band replication information.Therefore, when the sampling frequency of elementary audio stream is second frequency, always not have the coding form of SBR information, this elementary audio stream can be decoded, therefore, it is possible to prevent the variation of sampling frequency.

And, also can be, described targeting signal generating unit, the described sampling frequency obtained at the analysis result according to described analysis portion is the 3rd prespecified frequency, even if described elementary audio stream is not encoded to comprise the described coding form of described spectral band replication information, also generate the coding form illustrating to comprise described spectral band replication information and by the targeting signal of encoding.

Accordingly, the bit stream dispensing device that one embodiment of the present invention relates to, when the sampling frequency of elementary audio stream is the 3rd frequency, can be controlled to and carries out SBR process forcibly.Accordingly, this bit stream dispensing device, when the 3rd frequency is low-frequency band, can make the form that audio bitstream conforms with the regulations.

And, also can be, described targeting signal generating unit, the described sampling frequency obtained at the analysis result according to described analysis portion is the 4th prespecified frequency, even if described elementary audio stream is encoded to comprise the described coding form of described spectral band replication information, also generate the coding form illustrating not comprise described spectral band replication information and by the targeting signal of encoding.

Accordingly, the bit stream dispensing device that one embodiment of the present invention relates to, when the sampling frequency of elementary audio stream is the 4th frequency, can be controlled to do not have the AAC of SBR to decode.Accordingly, this bit stream dispensing device, when the 4th frequency is high frequency band, can make the form that audio bitstream conforms with the regulations.

And, also can be, the bit stream receive-transmit system that one embodiment of the present invention relates to, it is the bit stream receive-transmit system possessing described bit stream dispensing device and bit stream receiving trap, described bit stream receiving trap, receive the audio bitstream sent from this bit stream dispensing device, and the described audio bitstream received is decoded, described bit stream receiving trap, possess: targeting signal elimination portion, by eliminating the described targeting signal comprised in the described audio bitstream of reception, thus extract described elementary audio stream; And elementary audio stream lsb decoder, the information that the coding form of described elementary audio stream is shown recorded in described targeting signal, with described elementary audio stream in comprise the unmatched situation of information of the coding form of described elementary audio stream is shown under, with the coding form shown in the information that coding form is shown recorded in described targeting signal, described elementary audio stream is decoded.

And, also can be, the bit stream receive-transmit system that one embodiment of the present invention relates to, it is the bit stream receive-transmit system possessing described bit stream dispensing device and bit stream receiving trap, described bit stream receiving trap, receive the audio bitstream sent from this bit stream dispensing device, and the described audio bitstream received is decoded, described bit stream receiving trap, possess: targeting signal elimination portion, by eliminating the described targeting signal comprised in the described audio bitstream of reception, thus extract described elementary audio stream; And elementary audio stream lsb decoder, the information that the coding form of described elementary audio stream is shown recorded in described targeting signal, with described elementary audio stream in comprise the unmatched situation of information of the coding form of described elementary audio stream is shown under, according to the information that described coding form is shown recorded in described targeting signal, carry out making the signal that will expand to high frequency band become 0, the decoding process that make use of described spectral band replication information.

And, also can be, the bit stream receive-transmit system that one embodiment of the present invention relates to, it is the bit stream receive-transmit system possessing described bit stream dispensing device and bit stream receiving trap, described bit stream receiving trap, receive the audio bitstream sent from this bit stream dispensing device, and the described audio bitstream received is decoded, described bit stream receiving trap, possess: targeting signal elimination portion, by eliminating described targeting signal from the described audio bitstream received, thus extract described elementary audio stream; And elementary audio stream lsb decoder, the information that the coding form of described elementary audio stream is shown recorded in described targeting signal, with described elementary audio stream in comprise the unmatched situation of information of the coding form of described elementary audio stream is shown under, according to the information that described coding form is shown recorded in described targeting signal, generate the signal of the sampling frequency of 1/2 of sampling frequency when utilizing described spectral band replication information to carry out decoding process.

And, also can be, described bit stream receiving trap has informing capability portion, this informing capability portion, to illustrate that the message notice of the ability of this bit stream receiving trap is to described bit stream dispensing device, described analysis portion, analyze the FS information that the sampling rate of described elementary audio stream is shown, described targeting signal generating unit, when this FS information is prespecified value, corresponding with the information from described informing capability portion, illustrate that the targeting signal comprising spectral band replication information switches to whether generating.

And, also can be, the bit stream receiving trap that one embodiment of the present invention relates to, acceptance division, following audio bitstream is received from bit stream dispensing device, described audio bitstream refers to, to the elementary audio stream obtained coding audio signal, additional packets is containing the targeting signal of information of coding form of described elementary audio stream being shown and the audio bitstream of the form of the described regulation formed, and, in described audio bitstream, when the sampling frequency of described elementary audio stream and described coding form do not meet the form of described regulation of described audio bitstream, the coding form of the form of the described regulation of described audio bitstream will be met, record as the information that described coding form is shown in described targeting signal, targeting signal elimination portion, by eliminating the described targeting signal comprised in the described audio bitstream of reception, thus extracts described elementary audio stream, and elementary audio stream lsb decoder, the information that the coding form of described elementary audio stream is shown recorded in described targeting signal, with described elementary audio stream in comprise the unmatched situation of information of the coding form of described elementary audio stream is shown under, with the coding form shown in the information that coding form is shown recorded in described targeting signal, described elementary audio stream is decoded.

Accordingly, the bit stream receiving trap of this bit stream receive-transmit system, the information that coding form is shown recorded in described targeting signal, with described elementary audio stream in comprise the unmatched situation of information of the coding form of described elementary audio stream is shown under, with the coding form shown in the information that coding form is shown recorded in described targeting signal, described elementary audio stream can be decoded.Therefore, this bit stream receiving trap, even if the information that coding form is shown in elementary audio stream, with targeting signal in the unmatched situation of the information of coding form that illustrates under, also can not decode contradictorily to audio bitstream.

And, also can be, described bit stream receiving trap receives following audio bitstream, in described audio bitstream, when the described sampling frequency of described elementary audio stream is the 3rd prespecified frequency, even if described elementary audio stream is not encoded to comprise the described coding form of described spectral band replication information, also the coding form that illustrates to comprise described spectral band replication information is comprised and by the targeting signal of encoding, described elementary audio stream lsb decoder, the information that the coding form of described elementary audio stream is shown recorded in described targeting signal, with comprise in described elementary audio stream the unmatched situation of information of the coding form of described elementary audio stream is shown under, according to the information that described coding form is shown recorded in described targeting signal, carry out making the signal that will expand to high frequency band to become 0, make use of the decoding process of described spectral band replication information.

And, also can be, described bit stream receiving trap receives following audio bitstream, in described audio bitstream, when the described sampling frequency of described elementary audio stream is the 4th prespecified frequency, even if described elementary audio stream is encoded to comprise the described coding form of described spectral band replication information, also the coding form that illustrates not comprise described spectral band replication information is comprised and by the targeting signal of encoding, described elementary audio stream lsb decoder, the information that the coding form of described elementary audio stream is shown recorded in described targeting signal, with comprise in described elementary audio stream the unmatched situation of information of the coding form of described elementary audio stream is shown under, according to the information that described coding form is shown recorded in described targeting signal, generate the signal of the sampling frequency of 1/2 of sampling frequency when utilizing described spectral band replication information to carry out decoding process.

And so comprehensive or concrete form, can be realized by system, method, integrated circuit, computer program or recording medium, also can be realized by the arbitrary combination of system, method, integrated circuit, computer program and recording medium.Further, the present invention, the audio bitstream that also can generate as described bit stream dispensing device realizes.

Invention effect

As mentioned above, according to the present invention, a kind of bit stream dispensing device can be provided, even if when the form that the coding form of the reality corresponding with sampling frequency is against regulation, also can send as the audio bitstream be applicable to.

Further, according to one embodiment of the present invention, the undesirable condition when the sampling rate of the elementary audio stream that will be transfused to and the coding form corresponding with this sampling rate send with IEC61937 standard can be solved.

Further, according to other embodiment of the present invention, even if the elementary audio stream be transfused to is outside IEC61937 critical field, also can becomes in IEC61937 critical field and send bit stream.

And then, according to of the present invention also other embodiment can, when decoding to the elementary audio stream of input continuously, do not produce the change of the sampling rate of decoded signal.

And, further, according to other embodiment of the present invention, even if in the unmatched situation of parameter E corresponding with described parameter P comprised in the parameter P recorded in targeting signal additional in the bit stream received and the elementary audio stream forming this bit stream, also can normal generating solution coded signal.

Further, according to embodiment of going back other of the present invention, when the AAC of low FS, can become in IEC61937 critical field and send bit stream.

According to embodiment of going back other of the present invention, when the AAC of low FS, the regeneration sound of the sampling rate of prespecified middle FS can be generated.

According to embodiment of going back other of the present invention, when the HEAAC of high FS, can become in IEC61937 critical field and send bit stream.

According to embodiment of going back other of the present invention, when the AAC of high FS, the regeneration sound of the sampling rate of prespecified middle FS can be generated.

Accompanying drawing explanation

Fig. 1 is the figure of an example of the structure of the bit stream dispensing device that embodiments of the invention 1 are shown.

Fig. 2 is the figure of an example of the structure of the bit stream receiving trap that embodiments of the invention 1 are shown.

Fig. 3 is the figure of the Application Example to audio system of the bit stream receive-transmit system that embodiments of the invention 1 are shown.

Fig. 4 A is the different figure of the reproduction band of AAC mode and the HEAAC mode related to for illustration of embodiments of the invention 1.

Fig. 4 B is the different figure of the reproduction band of AAC mode and the HEAAC mode related to for illustration of embodiments of the invention 1.

Fig. 5 A is the figure that the stream shown in Figure 10 related to for illustration of embodiments of the invention 1 exports the implication of regulation.

Fig. 5 B is the figure that the stream shown in Figure 10 related to for illustration of embodiments of the invention 1 exports the implication of regulation.

Fig. 5 C is the figure that the stream shown in Figure 10 related to for illustration of embodiments of the invention 1 exports the implication of regulation.

Fig. 6 is the figure of an example of the structure of the bit stream receive-transmit system that embodiments of the invention 2 are shown.

Fig. 7 is the figure of an example of the data structure of output bit flow for illustration of IEC60958/IEC61937.

Fig. 8 A is the figure of an example of the description of the fixing head that ADTS form is shown.

Fig. 8 B is the figure of an example of the description of the head that LOAS form is shown.

Fig. 9 is the figure of the data mode that the expression targeting signal Pc that Fig. 7 (b) illustrates is shown.

Figure 10 illustrates, the stream for the IEC61937 standard of the sampling rate of elementary audio stream and the combination of coded audio data form exports figure with presence or absence of regulation.

Figure 11 A illustrates, HEAAC and AAC sampling rate are the figure of the reproducible frequency band of the coded data of 48KHz.

Figure 11 B illustrates, AAC and AAC sampling rate are the figure of the reproducible frequency band of the coded data of 48KHz.

Embodiment

Below, accompanying drawing is utilized to describe embodiments of the invention in detail.And the embodiment below illustrated, all illustrates an object lesson of the present invention.The allocation position of the numerical value shown in following embodiment, shape, material, inscape, inscape and connect the order etc. of form, step, step, is an example, instead of limits aim of the present invention.The present invention, is determined by claims.Therefore, for in the inscape of following embodiment, individual requests that upper concept of the present invention is shown not have the inscape of record in requiring, might not need to realize problem of the present invention, but, be illustrated as the key element forming preferred form.

(embodiment 1)

Below, for the bit stream dispensing device of embodiments of the invention 1, be described with reference to accompanying drawing.

Fig. 1 is the figure of the structure of the bit stream dispensing device 200 that the present embodiment 1 is shown.As Fig. 1 illustrates, bit stream dispensing device 200 possesses, input part 100, analysis portion 101, targeting signal generating unit 102, forming portion 103 and efferent 104.

Input part 100, obtains the elementary audio stream 300 obtained coding audio signal.

Analysis portion 101, analyzes sampling rate and the coded audio data form of the elementary audio stream 300 obtained.

Targeting signal generating unit 102, according to the analysis result of analysis portion 101, generates the targeting signal of the audio bitstream of the form forming IEC61937 defined.At this, targeting signal generating unit 102, when the sampling frequency obtained according to the analysis result of analysis portion 101 is prespecified value, will illustrate the parameter of the coded audio data form of elementary audio stream 300, change to the value of the regulation based on IEC61937, thus generate targeting signal.

Forming portion 103, is added to elementary audio stream 300 by the targeting signal that targeting signal generating unit 102 generates, thus forms the audio bitstream of IEC61937 form.

Efferent 104, exports the audio bitstream 301 formed by forming portion 103.

Fig. 2 is the figure of an example of the structure of the bit stream receiving trap that embodiment 1 is shown.As shown in Figure 2, bit stream receiving trap 201, receives the audio bitstream 301 sent from the bit stream dispensing device 200 shown in Fig. 1, decodes to the audio bitstream 301 received.This bit stream receiving trap 201 possesses, targeting signal elimination portion 202 and elementary audio stream lsb decoder 203.

Targeting signal elimination portion 202, is contained at bit stream receiving trap 201, from the IEC61937 form audio bit stream 301 that bit stream dispensing device 200 sends, eliminate targeting signal Pa, Pb, Pc and Pd, thus extracts elementary audio stream 300.

Elementary audio stream lsb decoder 203, is contained at bit stream receiving trap 201, decodes to the elementary audio stream 300 that targeting signal elimination portion 202 extracts, and generates sound signal (multi-channel decoding signal), exports the sound signal after generating.Elementary audio stream lsb decoder 203, when decoding to elementary audio stream 300, when the coded audio data form shown in the coded audio data form shown in targeting signal Pc and Extension_payload is contradictory, with the coded audio data form shown in targeting signal Pc, elementary audio stream 300 is decoded.

Fig. 3 illustrates, the receive-transmit system possessing the bit stream receiving trap 201 shown in the bit stream dispensing device 200 shown in Fig. 1 and Fig. 2 is arranged on the figure of the example of audio frequency apparatus.

As Fig. 3 illustrates, possess the bit stream receive-transmit system 210 of bit stream dispensing device 200 and bit stream receiving trap 201, the connecting line via the audio bitstream 301 of transmission IEC61937 form connects.This connecting line is, such as HDMI etc.Bit stream dispensing device 200, such as, is contained at televisor 220, via portion mixed under the demoder of televisor 220 inside and 2 passages, such as, is connected with the boombox of 2 passages.Televisor 220, via not illustrated antenna, tuner or CD driver etc., obtains elementary audio stream 300 from broadcast wave or CD etc., by the elementary audio stream 300 obtained, is input to the input part 100 of bit stream dispensing device 200.Demoder 221, obtains the elementary audio stream 300 being input to forming portion 103 from input part 100, once, be decoded as multi-channel audio signal.Mixed portion 222 (under 2ch mixed portion) under 2 passages, the multi-channel audio signal obtained being decoded to elementary audio stream 300 by demoder, mixing down is the stereo audio signal of 2 passages, and this stereo audio signal is outputted to boombox 223.

Bit stream receiving trap 201, such as, by the cinema system 230 contained at the Multi-channel loudspeaker 231 possessing 5.1 passages etc.This bit stream receiving trap 201, to input from bit stream dispensing device 200 via HDMI etc., decode based on the audio bitstream 301 of the regulation of IEC61937, multi-channel audio signal decoding obtained, outputs to Multi-channel loudspeaker 231.

Below, the more detailed work of bit stream dispensing device 200 as constructed as above is described.

First, input part 100, obtains elementary audio stream 300.Elementary audio stream 300 is, the stream of the data mode shown in Fig. 7, and imagine in the present embodiment 1, head type is LOAS form, and coded data is, does not comprise the coded data of the AAC mode of SBR information.Coded data portion in elementary audio stream 300 does not comprise Extension_payload310, and sampling rate (sampling frequency) described in head is 24kHz.

Then, in analysis portion 101, basic audio stream 300 is analyzed.In the present embodiment 1, the elementary audio stream 300 be transfused to is, sampling rate described above is 24kHz and does not comprise the stream of SBR information, therefore, analyzes this situation by analysis portion 101.The provision discussion bit stream of the LOAS head type according to Fig. 8 B, thus obtain sampling rate.Further, the provision discussion bit stream of the Extension_payload according to Fig. 7, thus obtain the presence or absence of SBR information.

Then, in targeting signal generating unit 102, according to the analysis result of analysis portion 101, the targeting signal of IEC61937 form is generated.When the sampling rate of elementary audio stream 300 is 24kHz and does not comprise SBR information, as Figure 10 illustrates, do not define the audio bitstream of IEC61937 form.Therefore, targeting signal generating unit 102, generates and illustrates that elementary audio stream 300 comprises the targeting signal of SBR information.Specifically, targeting signal generating unit 102, is set as 23 by the value shown in 5 positions of the 0 to 4 of targeting signal Pc the.Accordingly, targeting signal Pc illustrates, head type is LOAS form.And then targeting signal generating unit 102, is set as 2 by the value shown in two positions of the 5 to 6 of targeting signal Pc the.Accordingly, targeting signal Pc illustrates, comprises SBR information in elementary audio stream 300.At this, comprise SBR information and refer to, that is, targeting signal Pc illustrates, elementary audio stream 300 is encoded in HEAAC mode.In the present embodiment 1, sampling rate is 24kHz, but, certainly, even 22.05kHz and 16kHz is also same.

Then, forming portion 103, is added to elementary audio stream 300 by the targeting signal exported from targeting signal generating unit 102.That is, forming portion 103, forms the audio bitstream of the IEC61937 form shown in audio bitstream 301 of Fig. 7.

Finally, efferent 104, outputs to external unit using the audio bitstream 301 as the signal from forming portion 103.

Further, for the work of the bit stream receiving trap 201 that such as Fig. 2 is formed, be below described.

First, bit stream dispensing device 200, is formed as the audio bitstream 301 of IEC61937 form by the elementary audio stream 300 of input, export this audio bitstream 301.

Such as, be 24kHz in the sampling rate (sampling frequency) of elementary audio stream 300 of input, when carrying out the coding not having SBR information (AAC mode), in the Pc in targeting signal, record the code illustrating and there is SBR information (HEAAC mode).And, such as, when there is SBR information (HEAAC mode), in the Pc in targeting signal, the code illustrating and do not have SBR information (AAC mode) is recorded for 48kHz in the sampling rate (sampling frequency) of elementary audio stream 300 of input.

Targeting signal elimination portion 202, eliminates targeting signal Pa, Pb, Pc and Pd the audio bitstream 301 of the IEC61937 form sent from bit stream dispensing device 1000, thus extracts elementary audio stream 300.If when comprising Stuffing signal in the audio bitstream 301 of IEC61937 form, targeting signal elimination portion 202, also removes this Stuffing signal, generate elementary audio stream 300.The elementary audio stream 300 of generation like this is, the elementary audio stream of AAC mode or HEAAC mode can be decoded according to the decoding order of mpeg standard defined.Further, in this targeting signal elimination portion 202, will illustrate that with presence or absence of SBR information, SBR detects with or without information from targeting signal Pc, this SBR is sent to follow-up elementary audio stream lsb decoder 203 with or without information.

Elementary audio stream lsb decoder 203, decodes to the elementary audio stream 300 extracted, thus generates sound signal.And, elementary audio stream lsb decoder 203, with reference to the SBR sent from targeting signal elimination portion 202 with or without information, judge the information with presence or absence of SBR information that illustrates that comprises in elementary audio stream 300 and the SBR from targeting signal elimination portion 202 whether contradictory with or without information, in case of conflict, according to the SBR from targeting signal elimination portion 202 with or without the content shown in information.

Such as, even if the sampling rate of elementary audio stream 300 is 24kHz and " not having SBR ", also when SBR illustrates " there is SBR information " with or without information, elementary audio stream lsb decoder 203, performs bandspreading process.Certainly, in fact in the Extension_payload of elementary audio stream 300, SBR information is not had, therefore, elementary audio stream lsb decoder 203, can not perform complete bandspreading process, but, such as, the process of the process that the sampling rate by decoded signal is sampled to twice etc. is carried out performing.That is, elementary audio stream lsb decoder 203, carries out making the composition that will copy as high frequency band with SBR be the process of the bandspreading process equivalence of 0 with performing.

Further, such as, even if the sampling rate of elementary audio stream 300 is 48kHz and " there is SBR information ", when SBR illustrates " not having SBR " with or without information, elementary audio stream lsb decoder 203, does not perform bandspreading process yet.Such as, elementary audio stream lsb decoder 203, skips and ignores in esse SBR information.Or, elementary audio stream lsb decoder 203, although be suitable in esse SBR information, be sampled to 1/2 under carrying out the sampling rate by output, generate the process of the signal of the 48kHz as its result etc.

And, elementary audio stream lsb decoder 203, the information with presence or absence of SBR information that illustrates comprised in elementary audio stream 300 and contradictory with or without information from the SBR in targeting signal elimination portion 202, according to what comprise in elementary audio stream 300, information with presence or absence of SBR information can be shown.

The decoded signal of generation like this, is sent to outside from elementary audio stream lsb decoder 203, is converted to the signal can listened by loudspeaker or headphone etc.

As mentioned above, the bit stream dispensing device 200 that the present embodiment 1 relates to, possesses: input part 100, obtains the elementary audio stream obtained coding audio signal; Analysis portion 101, analyzes sampling frequency and the coding form of basic audio stream; Targeting signal generating unit 102, according to the analysis result of analysis portion 101, generates the targeting signal of the audio bitstream forming IEC61937 form; Forming portion 103, is added to elementary audio stream by the targeting signal that targeting signal generating unit 102 generates, thus forms the audio bitstream of IEC61937 form; And efferent 104, export the audio bitstream formed by forming portion 103, targeting signal generating unit 102, the sampling frequency obtained at the analysis result according to analysis portion 101 is prespecified value, the parameter of the coded audio data form of elementary audio stream will be shown, change to the form of the IEC61937 meeting audio bitstream to generate targeting signal.

Accordingly, this bit stream dispensing device 200, can send the audio bitstream 301 that could not be sent to bit stream receiving trap 201 because not meeting IEC61937 no problemly.Its result is, this bit stream dispensing device 200, even if the combination of the sampling rate of elementary audio stream 300 and coded audio data form, outside the scope of IEC61937 standard, also can export as the audio bitstream 301 in the scope of IEC61937 standard.Particularly, according to the present embodiment 1, only change the presence or absence of the SBR information described in targeting signal, just can perform it, therefore, process very simple.

And, in the present embodiment 1, describe the sampling rate recorded in head and be 24kHz (or 22.05kHz, 16kHz) and the example of " not having SBR information ", but, the sampling rate recorded in head be 44.1kHz (or 32kHz) and " there is SBR information ", also can process equally.In the case, work as follows.

Analysis portion 101, analyzes sampling rate and the coded audio data form of basic audio stream 300.For the elementary audio stream 300 of input, analyzed as mentioned above by analysis portion 101, sampling rate is 44.1kHz and comprises the situation of SBR information.

Then, targeting signal generating unit 102, according to the analysis result of analysis portion 101, generates the targeting signal comprised in the audio bitstream 301 of IEC61937 form.Now, when the sampling rate of elementary audio stream 300 is 44.1kHz and comprises SBR information, as Figure 10 illustrates, do not define the audio bitstream of IEC61937 form, therefore, targeting signal generating unit 102, generates and the targeting signal not comprising SBR information is shown.Specifically, targeting signal generating unit 102, is set as 23 by the value shown in 5 positions of the 0 to 4 of targeting signal Pc the.Accordingly, targeting signal Pc illustrates, head type is LOAS form.And then targeting signal generating unit 102, is set as 1 by the value shown in two positions of the 5 to 6 of targeting signal Pc the.Accordingly, targeting signal Pc illustrates, does not comprise SBR information.That is, targeting signal Pc illustrates, the coded audio data form of elementary audio stream 300 is AAC mode.

Then, forming portion 103, is added to elementary audio stream 300 by the targeting signal of the output of targeting signal generating unit 102.That is, forming portion 103, forms the audio bitstream 301 of the IEC61937 form shown in Fig. 7.

Finally, efferent 104, outputs to external unit by the audio bitstream 301 formed by forming portion 103.

Accordingly, bit stream dispensing device 200, even if the elementary audio stream 300 of input, outside the scope of IEC61937 standard, also can export as the audio bitstream 301 in the scope of IEC61937 standard.

And, SBR information is changed if as above force, the illustrating of comprising in information with presence or absence of SBR and coded data that illustrate comprised in targeting signal with presence or absence of SBR, do not mate by information, but, also can be fixed as in advance, in absence of such a match, illustrate that with presence or absence of SBR, information processes according to what comprise in targeting signal.As mentioned above, it is compatible that the elementary audio stream of AAC and the elementary audio stream of HEAAC have regeneration, and therefore, even the audio bitstream of this unmatched IEC61937 form, external receiver also can regenerate this stream.

Fig. 4 A and Fig. 4 B illustrates its idea.At Fig. 4 A (a) to (b2) and Fig. 4 B (a) in (b2), transverse axis represents frequency.

Fig. 4 A (a) is, illustrates with HEAAC by the mode chart of frequency content comprised in the elementary audio stream 300 of encoding with frequency spectrum.In Figure 4 A, than sampling frequency 1/4 low-frequency band with the signal shown in solid line, encoded in AAC mode, than the signal shown in broken lines of 1/4 high frequency band of sampling frequency, encoded in SBR mode.

Fig. 4 A (b1) illustrates, frequency content when being processed by the signal of HEAAC demoder to the HEAAC that Fig. 4 A (a) illustrates.In the case, regeneration comprises the signal of the Whole frequency band of the both sides of low-frequency band and high frequency band.

Fig. 4 A (b2) illustrates, frequency content when being processed by the signal of AAC demoder to the HEAAC that Fig. 4 A (a) illustrates.In the case, not decoded by the high frequency band of encoding in SBR mode, only in AAC mode by the signal of low-frequency band of encoding, regenerated by AAC decoders decode.

Fig. 4 B (a) is, illustrates with AAC by the mode chart of frequency content comprised in the elementary audio stream 300 of encoding with frequency spectrum.In the case, Whole frequency band is encoded in AAC mode.

Fig. 4 B (b1) illustrates, frequency content when being processed by the signal of HEAAC demoder to the AAC that Fig. 4 B (a) illustrates.In the case, the signal of Whole frequency band is regenerated by HEAAC decoders decode.

Fig. 4 B (b2) illustrates, frequency content when being processed by the signal of AAC demoder to the AAC that Fig. 4 B (a) illustrates.In the case, also same with the situation shown in Fig. 4 B, the signal of Whole frequency band is by AAC decoders decode and regenerate.

That is, when signal is HEAAC actually, namely, when elementary audio stream 300 be with HEAAC coded audio data form by encode elementary audio stream, illustrated by targeting signal, when elementary audio stream 300 is encoded with AAC, elementary audio stream 300 is by AAC decoder processes.In the case, though can not obtain with original decoded by HEAAC time same tonequality, be also regenerated by AAC and decoded audible acoustic frequency (Fig. 4 A (b2)).Further, even if hypothesis targeting signal illustrates that AAC, in fact signal are also AAC, also can be processed the signal of this AAC by HEAAC decoding.That is, if processed the signal of this AAC by HEAAC decoding, then can obtain with original decoded by AAC time same tonequality (Fig. 4 B (b2)).

(application examples of embodiment 1)

And, in the present embodiment 1, utilize the example of " sampling rate recorded in head is 24kHz (or 22.05kHz, 16kHz) and does not have SBR information " and " sampling rate recorded in head is 44.1kHz (or 32kHz) and SBR information ", describe the structure solving first problem, but, when " sampling rate recorded in head is 48kHz and there is SBR information ", also by carrying out and described same process, thus Second Problem can be solved.Below, for the process of the situation of " sampling rate recorded in head is 48kHz and there is SBR information ", be described in detail.

First, analysis portion 101, analyzes sampling rate and the coded audio data form of basic audio stream 300.At this, for the elementary audio stream 300 of input, as mentioned above, be 48kHz by analysis portion 101 analytical sampling rate and comprised the situation of SBR information.

Then, targeting signal generating unit 102, generates the targeting signal of IEC61937 form according to the analysis result of analysis portion 101.When sampling rate is 48kHz, as Figure 10 illustrates, when comprising SBR information, also when not comprising, under any circumstance, the audio bitstream of IEC61937 form is all defined.But the targeting signal generating unit 102 of the present embodiment, even if when comprising SBR information, always, also generating and the targeting signal not comprising SBR information is shown.Specifically, targeting signal generating unit 102, is set as 23 by the value shown in 5 positions of the 0 to 4 of targeting signal Pc the.Accordingly, targeting signal Pc illustrates, head type is LOAS form.And then targeting signal generating unit 102, is set as 1 by the value shown in two positions of the 5 to 6 of targeting signal Pc the.Accordingly, targeting signal Pc illustrates, does not comprise SBR information in elementary audio stream 300.That is, targeting signal Pc, when sampling rate is 48kHz, always, generates and elementary audio stream 300 is shown in AAC mode by the targeting signal of encoding.

Then, forming portion 103, is added to elementary audio stream 300 by the targeting signal that targeting signal generating unit 102 generates.That is, forming portion 103, forms the audio bitstream 301 of the IEC61937 form shown in Fig. 7.

Accordingly, can suppress in actual DTV broadcast etc., the increase of the switching of output sampling frequency.Such as, in digital broadcasting., for program content portions, with coded audio data form for HEAAC and AAC sampling rate play for 48KHz, on the other hand, for advertisement part, with coded audio data form for AACLC and AAC sampling rate for 48KHz play when, bit stream dispensing device, for program content portions, output signal with IEC60958 frame per second 96KHz, advertisement part is outputed signal with the frame per second 48KHz of IEC60958.But, as above changed the presence or absence of SBR information by targeting signal generating unit 102, thus the change that regeneration frame per second occurs in the switching of program content portions and advertisement part can be prevented.Its result is, can not expect based on the high audio reproduction of the tonequality of the program content portions of bandspreading, but it is possible to avoid in bit stream receiving trap 201 to follow the change of IEC60958 frame per second and needing the undesirable condition of the jumping sound caused by spended time etc.

Fig. 5 A to Fig. 5 C is the figure of the transmission example for illustration of the stream exporting regulation based on the stream shown in Figure 10.In Fig. 5 A to Fig. 5 C, record zero of the word of a, b, c and d and targeting signal Pa, Pb, Pc and Pd are shown, hypographous zero illustrates elementary audio stream, and zero illustrates the padding data as the invalid data for regulating data length.Further, at this, the head type of the stream of transmission is set to LOAS form.

Fig. 5 A illustrates, such as, can transmit sampling rate and be 48kHz and by the figure of reason of the stream of AAC coding (not having SBR information).At this, with 32 bit representation 1 samples.Bit stream dispensing device, due to the elementary audio stream of to be sampling frequency be 48kHz, therefore, transmits data with the transmission speed of 48kHz × 32bits=1536kbps.Specifically, be defined as, by every 21.333msec (48kHz and the time of 1024 samples), Additional Preamble signal Pa, Pb, Pc and Pd, transmit the signal of 1 frame of 32768 successively.

To this, demoder, when the AAC of 48kHz, generates PCM data by every 21.333msec.Accordingly, signal provide rate consistent with the handling rate of demoder, therefore, demoder can not process contradictorily to signal.

Fig. 5 B illustrates, such as, can not transmit sampling rate and be 24kHz and by the figure of reason of the stream of AAC coding (not having SBR information).When sampling rate is the signal of 24kHz, bit stream dispensing device, transmits data as well with the transmission speed of 24kHz × 32bits=768kbps, but, there is no the pattern of 768kbps.If bit stream dispensing device utilizes the transmission speed of 1536kbps, then as Fig. 5 B illustrates transmission data.In the case, demoder, for the signal provided by every 21.333msec, generate the PCM data (because 24kHz and 1024 samples are 42.6667msec) of 42.6667msec, therefore, relative to the processing speed of demoder, from bit stream dispensing device signal provide superfluous.Accordingly, the raw overflow of miscarriage.

Fig. 5 C illustrates, such as, can transmit sampling rate and be 24kHz and by the figure of reason of the stream of HEAAC coding (there is SBR information).When being encoded with HEAAC, as Figure 11 A illustrates, even if the sampling rate in AAC portion is 24kHz, bit stream dispensing device, also be considered as overall for stream the signal that sampling rate is 48kHz, therefore, transmit data with the transmission speed of 48kHz × 32bits=1536kbps.Specifically, be defined as, by every 42.6667msec (48kHz and the time of 2048 samples), Additional Preamble signal Pa, Pb, Pc and Pd, by every 1 frame signal transmission.

To this, demoder, when the HEAAC of 24kHz, by every 42.6667msec, generates PCM data, therefore, signal provide rate consistent with the handling rate of demoder.Therefore, demoder can not process contradictorily to signal.

Same with described, can illustrate, sampling rate can be transmitted and be 44.1kHz and the stream of being encoded by AAC and sampling rate are 22.05kHz and the stream of being encoded by HEAAC, to this, sampling rate can not be transmitted and be 22.05kHz and the reason of the stream of being encoded by AAC.Further, can illustrate, sampling rate can be transmitted and be 32kHz and the stream of being encoded by AAC and sampling rate are 16kHz and the stream of being encoded by HEAAC, to this, sampling rate can not be transmitted and be 16kHz and the reason of the stream of being encoded by AAC.

This is because, the transfer rate 1411.2kbps (=44.1kHz × 32bits) exported and 1024kbps (=32kHz × 32bits), respectively by IEC60958 standardization, therefore, bit stream dispensing device can utilize it, but 705.6kbps (=22.05kHz × 32bits) and 512kbps (=16kHz × 32bits), is not standardized.

Different from described example, in sampling rate 48kHz, by the stream of being encoded by AAC with by the stream that HEAAC encodes, can transmit all no problemly.

Its reason is, be 48kHz for sampling rate and the stream of being encoded by AAC, because sampling rate is 48kHz, therefore, bit stream dispensing device, transmits data with the transmission speed of 48kHz × 32bits=1536kbps.Further, be defined as, by every 21.333msec (48kHz and the time of 1024 samples), Additional Preamble signal Pa, Pb, Pc and Pd, by every 1 frame (32768) signal transmission.

To this, demoder, when the AAC of 48kHz, generates PCM data by every 21.333msec, therefore, signal provide rate consistent with the handling rate of demoder.Therefore, demoder can not process contradictorily to signal.

Further, be 48kHz for sampling rate and the stream of being encoded by HEAAC, bit stream dispensing device, is considered as 96kHz by sampling rate, therefore, transmits data with the transmission speed of 96kHz × 32bits=3072kbps.Further, be defined as, by every 21.333msec (96kHz and the time of 2048 samples) Additional Preamble signal Pa, Pb, Pc and Pd, by every 1 frame (32768) signal transmission.

To this, demoder, when the HEAAC of 48kHz, generates PCM data by every 21.333msec, therefore, signal provide rate consistent with the handling rate of demoder.Therefore, demoder can not process contradictorily to signal.

As mentioned above, when elementary audio stream sampling rate 48kHz and when being encoded, no matter be AAC or HEAAC, can both transmit no problemly.On the other hand, at sampling rate 48kHz and by AAC encode stream and the stream of encoding with sampling rate 48kHz and by HEAAC switch, the stream of transfer rate to be the stream of 1536kbps and transfer rate be 3072kbps switches.Now, need in bit stream receive-transmit system entirety, such as, as switch A/D converter frequency of operation, again obtain synchronous process.The synchronous process again obtaining bit stream receive-transmit system entirety like this needs spended time, therefore, produces time lag when the switching of sampling rate.Such as, the situation of the undesirable condition produced as just compiling at program and being interrupted with the coupling part sound of CM is had.

To this, sampling rate is 48kHz and by the stream of HEAAC coding (there is SBR), as there is no SBR to transmit, thus transfer rate can be set to certain sampling rate.Accordingly, the undesirable condition of jumping sound etc. can be prevented.

And, in the described embodiment, bit stream receive-transmit system, produces time lag when the switching of sampling rate, therefore, when the sampling rate of elementary audio stream is 48kHz, no matter be when elementary audio stream is encoded with HEAAC, or when being encoded with AAC, always, all being considered as is encoded with AAC processes, but the present invention is not limited only to this.Such as, if the time lag produced when not minding the switching of sampling rate, bit stream receive-transmit system is also passable, and the signal being considered as elementary audio stream always HEAAC processes.

(embodiment 2)

Below, for the bit stream receive-transmit system 210 of embodiments of the invention 2, be described with reference to accompanying drawing.

Fig. 6 is the figure of the structure of the bit stream receive-transmit system that the present embodiment 2 is shown.In figure 6, the bit stream receive-transmit system 210 of embodiment 2 possesses, bit stream dispensing device 1000 and bit stream receiving trap 1001.

Bit stream dispensing device 1000 possesses, input part 100, analysis portion 101, forming portion 103, efferent 104 and targeting signal generating unit 1010.In bit stream dispensing device 1000, for the handling part that addition of the reference marks identical with each handling part of bit stream dispensing device 200, due to identical with the handling part described in Fig. 1 of embodiment 1, therefore omit the description.Below, main explanation targeting signal generating unit 1010.

Targeting signal generating unit 1010, from bit stream receiving trap 1001, receives the ability information of this bit stream receiving trap 1001, according to the ability information received, changes the information of that comprise in targeting signal Pc, that elementary audio stream is shown coded audio data form.Specifically, targeting signal generating unit 1010, according to the ability information received from bit stream receiving trap 1001, judges whether bit stream receiving trap 1001 has and sampling rate is 48kHz and by HEAAC by the ability that the elementary audio stream 300 of encoding is decoded.When be judged as bit stream receiving trap 1001 have sampling rate is 48kHz and the ability of being decoded by the elementary audio stream 300 of encoding by HEAAC, targeting signal generating unit 1010, different from described embodiment 1, when the sampling rate of the elementary audio stream 300 of reality is 48kHz and is encoded by HEAAC, generate and illustrate by HEAAC by the targeting signal Pc encoded.Specifically, targeting signal generating unit 1010, is set as 23 by the value shown in 5 positions of the 0 to 4 of targeting signal Pc the.Accordingly, targeting signal Pc illustrates, head type is LOAS form.And then targeting signal generating unit 1010, is set as 2 by the value shown in two positions of the 5 to 6 of targeting signal Pc the.Accordingly, targeting signal Pc illustrates, comprises SBR information in elementary audio stream 300.That is, targeting signal Pc illustrates, elementary audio stream 300 is encoded in HEAAC mode.

For described bit stream dispensing device 1000, the bit stream receiving trap 1001 of embodiment 2, receives the audio bitstream 301 sent from bit stream dispensing device 1000, decodes to the audio bitstream 301 received.Bit stream receiving trap 1001 possesses, targeting signal elimination portion 202, elementary audio stream lsb decoder 203 and capacity information notice portion 1011.In figure 6, for the handling part that addition of the reference marks identical with each handling part of bit stream receiving trap 201, due to identical with the handling part described in Fig. 2 of embodiment 1, and be described, therefore omit the description.Below, main explanation capacity information notice portion 1011.

Capacity information notice portion 1011, ability information is stored at the storer of inside, this ability information illustrates, the elementary audio stream lsb decoder 203 in bit stream receiving trap 1001, whether can be 48kHz to sampling rate and the elementary audio stream 300 of being encoded by HEAAC is decoded.Capacity information notice portion 1011, when there being the sending request of ability information from bit stream dispensing device 1000, the ability information stored by storer, informs the targeting signal generating unit 1010 of bit stream dispensing device 1000.

According to such structure, bit stream dispensing device 1000, elementary audio stream lsb decoder 203 in bit stream receiving trap 1001 possess sampling rate is 48kHz and the elementary audio stream of being encoded by HEAAC decode ability time, even if when the sampling rate of elementary audio stream 300 is 48kHz, also, when being encoded with HEAAC, can describe in targeting signal Pc and the parameter that there is SBR information is shown.Therefore, with AAC by under the content of encoding and the unchallenged situation of undesirable condition of being interrupted by the coupling part sound of the content of encoding with HEAAC, bit stream receiving trap 1001 can, according to the targeting signal comprised in the audio bitstream 301 transmitted from bit stream dispensing device 1000, elementary audio stream 300 is decoded.Accordingly, the effect obtained is, user, can enjoy with HEAAC by the content of encoding with the high tone quality of bandspreading to high frequency band.

And, even if at the elementary audio stream lsb decoder 203 of bit stream receiving trap 1001, possess sampling rate is 48kHz and the ability of being decoded by the stream of encoding with HEAAC when, bit stream receiving trap 1001, also dare to not to bit flow transmitting device 1000 notification capabilities information.In the case, bit stream receiving trap 1001 is also passable, such as, explain head and the Extension_payload of the elementary audio stream 300 extracted from the audio bitstream 301 that the bit stream dispensing device 200 of embodiment 1 receives, when comprising SBR information in elementary audio stream 300, according to this SBR information, elementary audio stream 300 is decoded.And then, and, even if when not comprising SBR information in the elementary audio stream 300 extracted from audio bitstream 301, bit stream receiving trap 1001 is also passable, carries out bandspreading and decode to the HEAAC of high frequency band.

Targeting signal generating unit 1010, when the sampling frequency obtained according to the analysis result of analysis portion 101 is prespecified second frequency, record the coding form not comprising SBR information in described elementary audio stream, using the information that described coding form is shown existed in targeting signal.Accordingly, such as, even if in the DTV of reality broadcasts etc., for program content portions, with coded audio data form for HEAAC and AAC sampling rate play, on the other hand, for advertisement part for 48KHz, with coded audio data form for AACLC and AAC sampling rate for 48KHz play when, the sampling rate of final decoded signal also can not change.Therefore, the switching part branch of programme content and cm section shifts smoothly.Accordingly, when the sampling frequency of elementary audio stream 300 be 48kHz and encoded by HEAAC, bit stream receiving trap 1001 possess the ability that it is decoded, this bit stream receiving trap 1001, can be regenerated by HEAAC and the high sound signal of decoded tonequality.

And, DTV for reality broadcasts, when being 24kHz with sampling rate and " there is SBR information " plays, even if when producing the undesirable condition of signal in the bad grade of accepting state because of broadcast wave and be short of SBR information, also the sampling rate of final output signal can be remained necessarily.So, this bit stream receive-transmit system, can reduce the impact that accepting state is bad.

And, in the present embodiment, targeting signal elimination portion 202 extracts SBR with or without information, this information is sent to elementary audio stream lsb decoder 203, but, unlike described, when the sampling rate shown in elementary audio stream 300 is 16kHz to 24kHz, bit stream receiving trap is also passable, always under the prerequisite of " there is SBR information ", decodes to elementary audio stream 300.Further, on the contrary, when the sampling rate shown in elementary audio stream 300 is 32kHz to 48kHz, bit stream receiving trap is also passable, always under the prerequisite of " not having SBR information ", decodes to elementary audio stream 300.

Above, describe bit stream dispensing device and bit stream receive-transmit system that embodiments of the invention relate to, but the present invention is not limited only to this embodiment.

Further, the bit stream dispensing device that described embodiment relates to or each handling part that bit stream receive-transmit system comprises, realize using the LSI as typical integrated circuit.By they difference single chips, also can, by they single chips, can make to comprise part or all.

Further, also can be by the processor executive routine of CPU etc., thus realize part or all of the function of bit stream dispensing device or bit stream receive-transmit system.

Further, the present invention can be described program, also can be the recording medium of the embodied on computer readable of the nonvolatile recording described program.Further, certainly, described program can be distributed by the transmission medium of internet etc.

Further, also can to combine in the function of bit stream dispensing device that described embodiment 1 to 2 relates to and bit stream receive-transmit system and its variation at least partially.

Further, the division of the functional block of block scheme is an example, also multiple functional block can be realized as a functional block, a functional block is divided into multiple or the function of a part is transferred to other functional block.Further, to the function of multiple functional blocks with similar function, by single hardware or software, process that the is parallel or time-division is carried out.

And then, be also contained in scope of the present invention not departing from the various distortion that those skilled in the art of carrying out in the scope of main idea of the present invention can expect.

Industrial applicibility

The bit stream dispensing device that the present invention relates to, possesses the means changed about information with presence or absence of SBR information, therefore, even if when have input there is no a bit stream of justice by IEC61937 standard, IEC61937 standard also can be utilized to send bit stream.Therefore, the present invention, can be widely applicable for the receiver that DTV broadcasts and the reclaim equiment that read output signal regenerates from the recording medium that audio coding signal is stored.Further, the present invention, the change of sampling rate when can suppress the switching of the content that coded audio data form is different, not have interruption and good regeneration sound therefore, it is possible to enjoy.

symbol description

100 input parts

101 analysis portion

102,1010 targeting signal generating units

103 forming portions

104 efferents

200,1000 bit stream dispensing devices

201,1001 bit stream receiving traps

202 targeting signal elimination portions

203 elementary audio stream lsb decoders

210 bit stream receive-transmit systems

220 televisors

221 demoders

Mixed portion under 2222 passages

223 loudspeakers

230 cinema systems

231 Multi-channel loudspeakers

300 elementary audio streams

301 audio bitstreams

1011 capacity information notice portions

Claims

1. a bit stream dispensing device, send the audio bitstream of the form of regulation, described bit stream dispensing device possesses:

Input part, obtains the elementary audio stream obtained coding audio signal;

Analysis portion, analyzes sampling frequency and the coding form of described elementary audio stream;

Targeting signal generating unit, according to the analysis result of described analysis portion, generates the targeting signal comprising the information of the coding form that described elementary audio stream is shown;

Forming portion, is added to described elementary audio stream by the described targeting signal that described targeting signal generating unit generates, thus forms the audio bitstream of the form of described regulation; And

Efferent, exports the described audio bitstream formed by described forming portion,

Described targeting signal generating unit, the described sampling frequency obtained according to the analysis result according to described analysis portion and described coding form, to the coding form of the form of the described regulation of described audio bitstream be met and the different coding form of the coding form obtained from the analysis result according to described elementary audio stream, record as the information that described coding form is shown in described targeting signal.

2. bit stream dispensing device as claimed in claim 1,

Described targeting signal generating unit, in the mode of output transmission speed in prespecified scope of the data exported from described efferent, records the information that described coding form is shown in described targeting signal.

3. bit stream dispensing device as claimed in claim 1,

The audio bitstream of the form of described regulation is the audio bitstream of IEC61937 prescribed by standard,

The described sampling frequency obtained at the analysis result according to described analysis portion is prespecified first frequency, in the described coding form corresponding with described first frequency when the corresponding scope of described IEC61937 standard is outer, described targeting signal generating unit, by coding forms different from analyzed described coding form for the presence or absence this point of the spectral band replication information in described elementary audio stream, as illustrating that the information of described coding form is recorded, thus generate described audio bitstream and become targeting signal in the corresponding scope of IEC61937 standard.

4. bit stream dispensing device as claimed in claim 3,

Described targeting signal generating unit, further, the described sampling frequency obtained at the analysis result according to described analysis portion is prespecified second frequency, described elementary audio stream, is recorded as the information that described coding form is shown in described targeting signal by the situation of encoding not comprise the coding form of described spectral band replication information.

5. bit stream dispensing device as claimed in claim 3,

Described targeting signal generating unit, the described sampling frequency obtained at the analysis result according to described analysis portion is the 3rd prespecified frequency, even if described elementary audio stream is not encoded to comprise the described coding form of described spectral band replication information, also generate the coding form illustrating to comprise described spectral band replication information and by the targeting signal of encoding.

6. bit stream dispensing device as claimed in claim 3,

Described targeting signal generating unit, the described sampling frequency obtained at the analysis result according to described analysis portion is the 4th prespecified frequency, even if described elementary audio stream is encoded to comprise the described coding form of described spectral band replication information, also generate the coding form illustrating not comprise described spectral band replication information and by the targeting signal of encoding.

7. a bit stream receive-transmit system, it is the bit stream receive-transmit system possessing bit stream dispensing device according to claim 1 and bit stream receiving trap, described bit stream receiving trap, receive the audio bitstream sent from this bit stream dispensing device, and the described audio bitstream received is decoded

Described bit stream receiving trap, possesses:

Targeting signal elimination portion, by eliminating the described targeting signal comprised in the described audio bitstream of reception, thus extracts described elementary audio stream; And

Elementary audio stream lsb decoder, the information that the coding form of described elementary audio stream is shown recorded in described targeting signal, with described elementary audio stream in comprise the unmatched situation of information of the coding form of described elementary audio stream is shown under, with the coding form shown in the information that coding form is shown recorded in described targeting signal, described elementary audio stream is decoded.

8. a bit stream receive-transmit system, it is the bit stream receive-transmit system possessing bit stream dispensing device according to claim 5 and bit stream receiving trap, described bit stream receiving trap, receive the audio bitstream sent from this bit stream dispensing device, and the described audio bitstream received is decoded

Described bit stream receiving trap, possesses:

Elementary audio stream lsb decoder, the information that the coding form of described elementary audio stream is shown recorded in described targeting signal, with described elementary audio stream in comprise the unmatched situation of information of the coding form of described elementary audio stream is shown under, according to the information that described coding form is shown recorded in described targeting signal, carry out making the signal that will expand to high frequency band become 0, the decoding process that make use of described spectral band replication information.

9. a bit stream receive-transmit system, it is the bit stream receive-transmit system possessing bit stream dispensing device according to claim 6 and bit stream receiving trap, described bit stream receiving trap, receive the audio bitstream sent from this bit stream dispensing device, and the described audio bitstream received is decoded

Described bit stream receiving trap, possesses:

Targeting signal elimination portion, by eliminating described targeting signal from the described audio bitstream received, thus extracts described elementary audio stream; And

Elementary audio stream lsb decoder, the information that the coding form of described elementary audio stream is shown recorded in described targeting signal, with described elementary audio stream in comprise the unmatched situation of information of the coding form of described elementary audio stream is shown under, according to the information that described coding form is shown recorded in described targeting signal, generate the signal of the sampling frequency of 1/2 of sampling frequency when utilizing described spectral band replication information to carry out decoding process.

10. the bit stream receive-transmit system as described in any one of claim 7 to 9,

Described bit stream receiving trap has informing capability portion, this informing capability portion, will illustrate that the message notice of the ability of this bit stream receiving trap is to described bit stream dispensing device,

Described analysis portion, analyzes the FS information that the sampling rate of described elementary audio stream is shown,

Described targeting signal generating unit, when this FS information is prespecified value, corresponding with the information from described informing capability portion, illustrate that the targeting signal comprising spectral band replication information switches to whether generating.

11. 1 kinds of bit stream receiving traps, possess:

Acceptance division, following audio bitstream is received from bit stream dispensing device, described audio bitstream refers to, to the elementary audio stream obtained coding audio signal, additional packets is containing the targeting signal of information of coding form of described elementary audio stream being shown and the audio bitstream of the form of the regulation formed, and, in described audio bitstream, when the sampling frequency of described elementary audio stream and described coding form do not meet the form of described regulation of described audio bitstream, the coding form of the form of the described regulation of described audio bitstream will be met, record as the information that described coding form is shown in described targeting signal,

12. bit stream receiving traps as claimed in claim 11,

Described bit stream receiving trap receives following audio bitstream, in described audio bitstream, when the described sampling frequency of described elementary audio stream is the 3rd prespecified frequency, even if described elementary audio stream is not encoded to comprise the described coding form of spectral band replication information, also the coding form that illustrates to comprise described spectral band replication information is comprised and by the targeting signal of encoding

Described elementary audio stream lsb decoder, the information that the coding form of described elementary audio stream is shown recorded in described targeting signal, with described elementary audio stream in comprise the unmatched situation of information of the coding form of described elementary audio stream is shown under, according to the information that described coding form is shown recorded in described targeting signal, carry out making the signal that will expand to high frequency band become 0, the decoding process that make use of described spectral band replication information.

13. bit stream receiving traps as claimed in claim 11,

Described bit stream receiving trap receives following audio bitstream, in described audio bitstream, when the described sampling frequency of described elementary audio stream is the 4th prespecified frequency, even if described elementary audio stream is encoded to comprise the described coding form of spectral band replication information, also the coding form that illustrates not comprise described spectral band replication information is comprised and by the targeting signal of encoding

Described elementary audio stream lsb decoder, the information that the coding form of described elementary audio stream is shown recorded in described targeting signal, with described elementary audio stream in comprise the unmatched situation of information of the coding form of described elementary audio stream is shown under, according to the information that described coding form is shown recorded in described targeting signal, generate the signal of the sampling frequency of 1/2 of sampling frequency when utilizing described spectral band replication information to carry out decoding process.

14. 1 kinds of bit stream sending methods are bit stream sending methods of the audio bitstream of the form sending regulation:

Obtain the elementary audio stream that coding audio signal is obtained;

Analyze sampling frequency and the coding form of described elementary audio stream;

According to described analysis result, generate the targeting signal comprising the information of the coding form that described elementary audio stream is shown;

The described targeting signal generated is added to described elementary audio stream, thus forms the audio bitstream of the form of described regulation;

Export the described audio bitstream be formed;

In the generation of described targeting signal, according to the described sampling frequency obtained according to described analysis result and described coding form, to the coding form of the form of the described regulation of described audio bitstream be met and the different coding form of the coding form obtained from the analysis result according to described elementary audio stream, record as the information that described coding form is shown in described targeting signal.

15. 1 kinds of bit stream method of reseptances,

Following audio bitstream is received from bit stream dispensing device, described audio bitstream refers to, to the elementary audio stream obtained coding audio signal, additional packets is containing the targeting signal of information of coding form of described elementary audio stream being shown and the audio bitstream of the form of the regulation formed, and, in described audio bitstream, according to sampling frequency and the described coding form of described elementary audio stream, the coding form of the form of the described regulation of described audio bitstream will be met, and the coding form that the coding form obtained from the analysis result according to described elementary audio stream is different, record as the information that described coding form is shown in described targeting signal,

By eliminating the described targeting signal comprised in the described audio bitstream of reception, thus extract described elementary audio stream;

The information that the coding form of described elementary audio stream is shown recorded in described targeting signal, with described elementary audio stream in comprise the unmatched situation of information of the coding form of described elementary audio stream is shown under, with the coding form shown in the information that coding form is shown recorded in described targeting signal, described elementary audio stream is decoded.

16. 1 kinds of integrated circuit, possess:

Input part, obtains the elementary audio stream obtained coding audio signal;

Forming portion, is added to described elementary audio stream by the described targeting signal that described targeting signal generating unit generates, thus forms the audio bitstream of the form of regulation; And

17. 1 kinds of integrated circuit, possess:

Acceptance division, following audio bitstream is received from bit stream dispensing device, described audio bitstream refers to, to the elementary audio stream obtained coding audio signal, additional packets is containing the targeting signal of information of coding form of described elementary audio stream being shown and the audio bitstream of the form of the regulation formed, and, in described audio bitstream, according to sampling frequency and the described coding form of described elementary audio stream, the coding form of the form of the described regulation of described audio bitstream will be met, and the coding form that the coding form obtained from the analysis result according to described elementary audio stream is different, record as the information that described coding form is shown in described targeting signal,