CN102355309A - Method and apparatus for realization of Bluetooth stereophonic sound with support of a plurality of sampling rates - Google Patents
Method and apparatus for realization of Bluetooth stereophonic sound with support of a plurality of sampling rates Download PDFInfo
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- CN102355309A CN102355309A CN2011102268783A CN201110226878A CN102355309A CN 102355309 A CN102355309 A CN 102355309A CN 2011102268783 A CN2011102268783 A CN 2011102268783A CN 201110226878 A CN201110226878 A CN 201110226878A CN 102355309 A CN102355309 A CN 102355309A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/033—Headphones for stereophonic communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
- H04M1/6041—Portable telephones adapted for handsfree use
- H04M1/6058—Portable telephones adapted for handsfree use involving the use of a headset accessory device connected to the portable telephone
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2250/00—Details of telephonic subscriber devices
- H04M2250/02—Details of telephonic subscriber devices including a Bluetooth interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/07—Applications of wireless loudspeakers or wireless microphones
Abstract
The invention discloses a method for realization of a Bluetooth stereophonic sound with support of a plurality of sampling rates. The method comprises the following steps that: an audio file that needs to be played is read and is decoded into pulse code modulation (PCM) data; a sampling rate of the PCM data is converted into a sampling rate that is suitable for a bluetooth stereophonic sound protocol; after the converted PCM data is encoded, the encoded PCM data are sent to a Bluetooth stereo headphone for playing. In addition, the invention also discloses an apparatus for realization of a Bluetooth stereophonic sound with support of a plurality of sampling rates. According to the method and the apparatus provided in the invention, on one hand, when a user can conveniently listen to an audio file through a Bluetooth without limitation of any format; on the other hand, acoustic qualities for listening by a Bluetooth can be improved and stereo playing can be realized.
Description
Technical field
The present invention relates to the Bluetooth transmission technology, be meant a kind of implementation method and device of supporting the Bluetooth stereo of multiple sample rate especially.
Background technology
What Bluetooth technology was used in the consumer electronics field at present is increasingly extensive, and especially the Bluetooth stereo music in the Bluetooth technology also more and more becomes fashion personage's selection.And what support wherein that Bluetooth stereo plays mainly is to rely on Bluetooth audio frequency mode (Advanced Audio Distribution Profile, A2DP) agreement.The A2DP agreement can adopt the chip in the earphone to come stacked data, reaches the high definition of sound.
But the audio file of two kinds of sample rates, i.e. 44.1KHz and 48KHz are only supported in A2DP agreement the inside.Yet along with the raising of modern compression coding technology, the degree of a lot of music compression is more and more higher, and sample rate is also more and more lower, even the audio file with the much the same 8KHz sample rate of voice occurred.Therefore how to make bluetooth earphone can support that the audio file of multiple sample rate is a urgent problem.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of implementation method and device of supporting the Bluetooth stereo of multiple sample rate, and the audio file that can solve multiple sample rate can't be realized the problem that Bluetooth stereo is play.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of implementation method of supporting the Bluetooth stereo of multiple sample rate comprises: read the audio file that needs are play, audio file is decoded as the pulse code modulation (pcm) data; With the sample rate conversion of PCM data is the sample rate that is fit to the Bluetooth stereo agreement; After the PCM digital coding after the conversion, send to the Bluetooth stereo earphone and play.
Said sample rate conversion with the PCM data comprises for being fit to the sample rate of Bluetooth stereo agreement: utilize the mode of interpolation or extraction, with the sample rate conversion of PCM data for being fit to the sample rate of Bluetooth stereo agreement.
The mode of said interpolation or extraction is changed, and comprising:
When the sample rate of PCM data is lower than the sample rate that is fit to the Bluetooth stereo agreement, utilize the mode of interpolation that sample rate is changed;
When the sample rate of PCM data is higher than the sample rate that is fit to the Bluetooth stereo agreement, utilize the mode that extracts that sample rate is changed.
After the PCM digital coding after said will the conversion; Sending to the Bluetooth stereo earphone plays; Be specially: after data based sample frequency of the PCM after will changing and code stream calculate reproduction time; Be encoded into sub-band coding (SBC) form; Through serial ports with the disposable Bluetooth chip that sends to of data; Be modulated into analog signal after decoding by Bluetooth chip, send to the Bluetooth stereo earphone through eating dishes without rice or wine and play.
The form of said audio file comprises the various coded formats of voice data; The sample rate of said suitable Bluetooth stereo agreement comprises: 44.1KHz or 48KHz.
A kind of implement device of supporting the Bluetooth stereo of multiple sample rate comprises: master controller and Bluetooth chip, wherein,
Said master controller is used to read the audio file that needs are play, and audio file is decoded as the PCM data, with the sample rate conversion of PCM data for being fit to the sample rate of Bluetooth stereo agreement; To send to Bluetooth chip after the PCM digital coding after the conversion;
Said Bluetooth chip is used for that the data behind the said coding are sent to the Bluetooth stereo earphone and plays.
Said master controller for being fit to the sample rate of Bluetooth stereo agreement, comprises the sample rate conversion of PCM data: utilize the mode of interpolation or extraction, with the sample rate conversion of PCM data for being fit to the sample rate of Bluetooth stereo agreement.
Said master controller adopts the mode of interpolation or extraction to change, and comprising:
When the sample rate of PCM data is lower than the sample rate that is fit to the Bluetooth stereo agreement, utilize the mode of interpolation that sample rate is changed;
When the sample rate of PCM data is higher than the sample rate that is fit to the Bluetooth stereo agreement, utilize the mode that extracts that sample rate is changed.
Send to Bluetooth chip after the PCM digital coding after said master controller will be changed; Be specially: after data based sample frequency of the PCM after will changing and code stream calculate reproduction time; Be encoded into the SBC form, through serial ports with the disposable Bluetooth chip that sends to of data.
The form of said audio file comprises the various coded formats of voice data; The sample rate of said suitable Bluetooth stereo agreement comprises: 44.1KHz or 48KHz.
The implementation method and the device of the Bluetooth stereo of the multiple sample rate of support provided by the present invention at first read the audio file that needs broadcast, and audio file is decoded as pulse code modulation (Pulse Code Modulation, PCM) data; With the sample rate conversion of PCM data is the sample rate that is fit to the Bluetooth stereo agreement; After the PCM digital coding after the conversion, send to the Bluetooth stereo earphone and play.In the process of sending code stream, send according to decoded PCM data, and sample rate is adjusted the PCM data volume that back calculating needs transmission, be the SBC form with this PCM digital coding then, property is given Bluetooth chip these SBC formatted datas again.So just need not change and send, make the user convenient on the one hand, can improve the tonequality that bluetooth is listened in addition yet, realize played in stereo through the restriction that bluetooth listening to audio file no longer receives form according to every kind of form account form separately.
Description of drawings
Fig. 1 is a kind of implementation method schematic flow sheet of supporting the Bluetooth stereo of multiple sample rate of the present invention;
Fig. 2 is the sampled point sketch map of interpolation conversion of the present invention;
Fig. 3 is a kind of implement device structural representation of supporting the Bluetooth stereo of multiple sample rate of the present invention.
Embodiment
Basic thought of the present invention is: at first read the audio file that needs broadcast, audio file is decoded as the PCM data; With the sample rate conversion of PCM data is the sample rate that is fit to the Bluetooth stereo agreement; After the PCM digital coding after the conversion, send to the Bluetooth stereo earphone and play.
Below in conjunction with accompanying drawing and specific embodiment technical scheme of the present invention is further set forth in detail.
Fig. 1 is a kind of implementation method schematic flow sheet of supporting the Bluetooth stereo of multiple sample rate of the present invention, and as shown in Figure 1, said method specifically may further comprise the steps:
Concrete, the form of said audio file comprises the various coded formats of voice data.Modal have: coded formats such as MP3, AMR, AAC, WMR, WAV.
Concrete, the sample rate of said suitable Bluetooth stereo agreement comprises: 44.1KHz or 48KHz.Said sample rate conversion with the PCM data comprises for being fit to the sample rate of Bluetooth stereo agreement: utilize the mode of interpolation or extraction, with the sample rate conversion of PCM data for being fit to the sample rate of Bluetooth stereo agreement.Wherein, when the sample rate of PCM data is lower than the sample rate that is fit to the Bluetooth stereo agreement, utilize the mode of interpolation that sample rate is changed; When the sample rate of PCM data is higher than the sample rate that is fit to the Bluetooth stereo agreement, utilize the mode that extracts that sample rate is changed.
Concrete; After the PCM digital coding after said will the conversion; Sending to the Bluetooth stereo earphone plays; Be specially: data based sample frequency of the PCM after will changing and code stream are encoded into sub-band coding (Sub-Band Codec, SBC) form after calculating reproduction time; Through serial ports UART for example; With the disposable Bluetooth chip that sends to of data, be modulated into analog signal after decoding by Bluetooth chip, send to the Bluetooth stereo earphone through eating dishes without rice or wine and play.
Fig. 2 is the sampled point sketch map of interpolation conversion of the present invention; As shown in Figure 2; The sampled point of former data is respectively sampled point 1, sampled point 2, sampled point 3 and sampled point 4; In the computational process of said interpolation; Can adopt average interpolation algorithm after 4 additions of preceding 2 points and back 2 points; Be sampled point 1, sampled point 2, sampled point 3 and sampled point 4 additions divided by 4 value size, the centre position of the position of interpolation between sampled point 2 and sampled point 3, i.e. sampled point 5 among the figure for sampling.The average interpolation method that this algorithm is common relatively, tonequality can be much level and smooth, do not have the sudden change sound.
Fig. 3 is a kind of implement device structural representation of supporting the Bluetooth stereo of multiple sample rate of the present invention, as shown in Figure 3, comprises in the said device: master controller 31 and Bluetooth chip 32, wherein,
Said master controller 31 is used to read the audio file that needs are play, and audio file is decoded as the PCM data, with the sample rate conversion of PCM data for being fit to the sample rate of Bluetooth stereo agreement; To send to Bluetooth chip 32 after the PCM digital coding after the conversion;
Concrete, said audio file can be kept in the device, also can be kept in the equipment that said device has been installed, said equipment for example: mobile phone, MP3 player, computer etc.The form of said audio file comprises the various coded formats of voice data.Modal have: coded formats such as MP3, AMR, AAC, WMR, WAV.
Further, the sample rate of said suitable Bluetooth stereo agreement comprises: 44.1KHz or 48KHz.Said master controller 31 for being fit to the sample rate of Bluetooth stereo agreement, comprises the sample rate conversion of PCM data: utilize the mode of interpolation or extraction, with the sample rate conversion of PCM data for being fit to the sample rate of Bluetooth stereo agreement.Wherein, when the sample rate of PCM data is lower than the sample rate that is fit to the Bluetooth stereo agreement, utilize the mode of interpolation that sample rate is changed; When the sample rate of PCM data is higher than the sample rate that is fit to the Bluetooth stereo agreement, utilize the mode that extracts that sample rate is changed.
Further; Send to Bluetooth chip 32 after the PCM digital coding after said master controller 31 will be changed; Be specially: after data based sample frequency of the PCM after will changing and code stream calculate reproduction time; Be encoded into the SBC form; Through serial ports UART for example, with the disposable Bluetooth chip 32 that sends to of data.
Said Bluetooth chip 32 is used for that the data behind the said coding are sent to the Bluetooth stereo earphone and plays.
Concrete; The data of said Bluetooth chip 32 after with said coding send to the Bluetooth stereo earphone and play; Be specially: be modulated into analog signal after the data decode of Bluetooth chip 32 after, send to the Bluetooth stereo earphone through eating dishes without rice or wine and play said coding.
In practical application, said master controller 31 can adopt the base band control chip, and said Bluetooth chip 32 can adopt the BC6 model to realize above-mentioned functions.
The invention has the advantages that following 2 points in sum: first audio file that can support multiple sample rate; It can be play with Bluetooth stereo: at present the sample frequency play of the music file supported of A2DP is 44.1khz and 48khz, is unsupported for the music of other sample frequencys.The present invention be exactly through interpolation or the method that extracts originally sample rate be not that to be transformed into sample rate be 44.1khz or 48khz for the audio file of 44.1khz and 48khz.Become 44.1khz or 48khz if the music file sample rate is lower than the interpolation of just carrying out of 44.1khz or 48khz, become 44.1khz or 48khz if the music file sample rate is higher than just extracting of 44.1khz or 48khz.Second code stream control method of supporting various audio formats: current audio form and coded system have a lot, and modal have MP3, AMR, AAC, WMR, a WAV etc.Every kind of form has nothing in common with each other, and how long every frame is play, and how to give how many data to bluetooth, all inequality.So when sending code stream, send according to decoded PCM data; And according to interpolation or the sample rate after extracting calculate and need the PCM data volume of sending; Be the SBC form with this PCM digital coding then, property is given Bluetooth chip these SBC formatted datas again.So just need not change and send according to every kind of form account form separately, it be convenient to make that the user passes through bluetooth listening to audio file on the one hand, also can improve the tonequality that bluetooth is listened in addition.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. implementation method of supporting the Bluetooth stereo of multiple sample rate is characterized in that said method comprises:
Read the audio file that needs broadcast, audio file is decoded as the pulse code modulation (pcm) data;
With the sample rate conversion of PCM data is the sample rate that is fit to the Bluetooth stereo agreement;
After the PCM digital coding after the conversion, send to the Bluetooth stereo earphone and play.
2. method according to claim 1; It is characterized in that; Said sample rate conversion with the PCM data comprises for being fit to the sample rate of Bluetooth stereo agreement: utilize the mode of interpolation or extraction, with the sample rate conversion of PCM data for being fit to the sample rate of Bluetooth stereo agreement.
3. method according to claim 2 is characterized in that, the mode of said interpolation or extraction is changed, and comprising:
When the sample rate of PCM data is lower than the sample rate that is fit to the Bluetooth stereo agreement, utilize the mode of interpolation that sample rate is changed;
When the sample rate of PCM data is higher than the sample rate that is fit to the Bluetooth stereo agreement, utilize the mode that extracts that sample rate is changed.
4. method according to claim 1 and 2 is characterized in that, after the PCM digital coding after said will the conversion, sends to the Bluetooth stereo earphone and plays, and is specially:
Behind data based sample frequency of PCM after the conversion and code stream calculating reproduction time; Be encoded into sub-band coding (SBC) form; Through serial ports with the disposable Bluetooth chip that sends to of data; Be modulated into analog signal after decoding by Bluetooth chip, send to the Bluetooth stereo earphone through eating dishes without rice or wine and play.
5. method according to claim 1 and 2 is characterized in that, the form of said audio file comprises the various coded formats of voice data; The sample rate of said suitable Bluetooth stereo agreement comprises: 44.1KHz or 48KHz.
6. implement device of supporting the Bluetooth stereo of multiple sample rate is characterized in that said device comprises: master controller and Bluetooth chip, wherein,
Said master controller is used to read the audio file that needs are play, and audio file is decoded as the PCM data, with the sample rate conversion of PCM data for being fit to the sample rate of Bluetooth stereo agreement; To send to Bluetooth chip after the PCM digital coding after the conversion;
Said Bluetooth chip is used for that the data behind the said coding are sent to the Bluetooth stereo earphone and plays.
7. device according to claim 6; It is characterized in that; Said master controller for being fit to the sample rate of Bluetooth stereo agreement, comprises the sample rate conversion of PCM data: utilize the mode of interpolation or extraction, with the sample rate conversion of PCM data for being fit to the sample rate of Bluetooth stereo agreement.
8. device according to claim 7 is characterized in that, said master controller adopts the mode of interpolation or extraction to change, and comprising:
When the sample rate of PCM data is lower than the sample rate that is fit to the Bluetooth stereo agreement, utilize the mode of interpolation that sample rate is changed;
When the sample rate of PCM data is higher than the sample rate that is fit to the Bluetooth stereo agreement, utilize the mode that extracts that sample rate is changed.
9. according to claim 6 or 7 described devices; It is characterized in that; Send to Bluetooth chip after the PCM digital coding after said master controller will be changed; Be specially: after data based sample frequency of the PCM after will changing and code stream calculate reproduction time; Be encoded into the SBC form, through serial ports with the disposable Bluetooth chip that sends to of data.
10. according to claim 6 or 7 described devices, it is characterized in that the form of said audio file comprises the various coded formats of voice data; The sample rate of said suitable Bluetooth stereo agreement comprises: 44.1KHz or 48KHz.
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| CN2011102268783A CN102355309A (en) | 2011-08-09 | 2011-08-09 | Method and apparatus for realization of Bluetooth stereophonic sound with support of a plurality of sampling rates |
| PCT/CN2011/080936 WO2012151847A1 (en) | 2011-08-09 | 2011-10-18 | Method and device for implementing bluetooth stereo supporting multiple sampling rates |
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| CN2011102268783A CN102355309A (en) | 2011-08-09 | 2011-08-09 | Method and apparatus for realization of Bluetooth stereophonic sound with support of a plurality of sampling rates |
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| CN103905834A (en) * | 2014-03-13 | 2014-07-02 | 深圳创维－Rgb电子有限公司 | Voice data coded format conversion method and device |
| WO2016066123A1 (en) * | 2014-10-29 | 2016-05-06 | Mediatek Inc. | Audio sample rate control method applied to audio front-end and related non-transitory machine readable medium |
| WO2016107178A1 (en) * | 2014-12-30 | 2016-07-07 | 中兴通讯股份有限公司 | Method and device for playing ring back tone |
| CN106205651A (en) * | 2016-06-30 | 2016-12-07 | 乐视控股（北京）有限公司 | Sample rate method for transformation, device and terminal |
| WO2017101327A1 (en) * | 2015-12-18 | 2017-06-22 | 乐视控股（北京）有限公司 | Method and device for collective playback of high-fidelity sound by several players |
| CN108419223A (en) * | 2018-02-27 | 2018-08-17 | 上海康斐信息技术有限公司 | A kind of playback method and music earphone of music earphone |
| CN108540902A (en) * | 2018-04-18 | 2018-09-14 | 四川斐讯信息技术有限公司 | A kind of Bluetooth audio frequency playback method and system suitable for internet of things equipment |
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| CN110634512A (en) * | 2019-09-29 | 2019-12-31 | 李翼东 | Method, device and equipment for converting sampling rate of audio file and storage medium |
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| CN103905834A (en) * | 2014-03-13 | 2014-07-02 | 深圳创维－Rgb电子有限公司 | Voice data coded format conversion method and device |
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| CN108419223A (en) * | 2018-02-27 | 2018-08-17 | 上海康斐信息技术有限公司 | A kind of playback method and music earphone of music earphone |
| CN108540902A (en) * | 2018-04-18 | 2018-09-14 | 四川斐讯信息技术有限公司 | A kind of Bluetooth audio frequency playback method and system suitable for internet of things equipment |
| CN108648772A (en) * | 2018-04-19 | 2018-10-12 | 上海康斐信息技术有限公司 | A kind of the Bluetooth audio frequency playback method and electronic equipment of low-power consumption |
| CN110634512A (en) * | 2019-09-29 | 2019-12-31 | 李翼东 | Method, device and equipment for converting sampling rate of audio file and storage medium |
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| WO2012151847A1 (en) | 2012-11-15 |
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Application publication date: 20120215 |