CN103347114B - Bluetooth-based DTMF decoding method and system - Google Patents
Bluetooth-based DTMF decoding method and system Download PDFInfo
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- CN103347114B CN103347114B CN201310203048.8A CN201310203048A CN103347114B CN 103347114 B CN103347114 B CN 103347114B CN 201310203048 A CN201310203048 A CN 201310203048A CN 103347114 B CN103347114 B CN 103347114B
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Abstract
The invention discloses a bluetooth-based dual tone multi frequency (DTMF) decoding method and system. The method comprises the following steps that: a bluetooth module of a vehicle-mounted system carries out communication with an external bluetooth and converts a received voice analog signal into pulse-code modulation (PCM) data; the bluetooth module sends the PCM data to a CPU; a drive program reads the PCM data in the CPU and stores the PCM data to an first-input first-output (FIFO) internal memory; and the PCM data are converted into a corresponding DTMF code. According to the invention, the voice analog signal is converted into the PCM data for transmission by using the bluetooth and the PCM data are converted into the DTMF code, so that the DTMF decoding is realized without an independent decoding chip and thus the cost is lowered. Meanwhile, complicated DTMF decoding can be processed; and the DTMF decoding can be carried out even though there is no sound card and no ADC pin is led out at a car.
Description
Technical field
The present invention relates to DTMF decoding technique field, particularly relate to a kind of DTMF coding/decoding method based on bluetooth and system.
Background technology
DTMF (Dual Tone Multi Frequency) is the dial mode in telephone, has a wide range of applications in Modern Communication System, has that speed is fast, error code is low, call completing rate advantages of higher relative to pulse dialing method.DTMF principle represents digital signal to realize a kind of coding techniques of its function by two specific single audio frequency composite signals.The frequency of two single audio frequency is different, the numeral of representative or the function of realization also different.Usual 16 buttons, wherein have 10 numerical keys 0 ~ 9 and 6 function key *, #, A, B, C, D.Due to according to combinatorial principle, the single audio signal that 8 kinds different generally should be had.Therefore adoptable frequency also has 8 kinds, is namely referred to as multifrequency.Because it adopts any extraction 2 kinds from 8 kinds of frequencies to carry out combination to encode, so be also referred to as the coding techniques of " getting 2 in 8 ".
Existing DTMF decoding process is generally by program Solidification to chip, such as single-chip microcomputer, special chip or ARM chip, carries out hard decoder by hardware to dtmf signal.The mode of DTMF decoding can also be decoded with the ADC of ARM sampling, also sound card recording synchronous decoding can be utilized, but there is following technical problem, special chip is utilized to carry out hard decoder, add product cost and manufacturing cost, not easily promote, and on some car machines, there is no sound card, when also not drawing ADC pin, just cannot decode.
In view of this, prior art haves much room for improvement and improves.
Summary of the invention
In view of the deficiencies in the prior art, the object of the invention is to provide a kind of DTMF coding/decoding method based on bluetooth and system, be intended to solve the DTMF decoding technique of prior art adopts program Solidification is brought to chip decoding difficulties, cost increase, and there is no the problem that cannot decode when sound card and AC pin.
Technical scheme of the present invention is as follows:
Based on a DTMF coding/decoding method for bluetooth, wherein, comprise the following steps:
The bluetooth module of S11, onboard system and outside bluetooth communication, be converted into PCM data by the voice analog signal of the outside bluetooth received;
Described PCM data are sent to CPU by S12, described bluetooth module;
S13, the PCM data read in CPU, and be saved in FIFO internal memory;
S14, be corresponding DTMF code by described PCM data transformations.
The described DTMF coding/decoding method based on bluetooth, wherein, also comprised before described step S11:
Bluetooth module and the outside bluetooth of S10, onboard system are matched, and after pairing completes, dialing enters talking state.
The described DTMF coding/decoding method based on bluetooth, wherein, also comprises after described step S14:
Dialing in S15, detection DTMF code or digital information, exported by output equipment.
The described DTMF coding/decoding method based on bluetooth, wherein, described step S14 specifically comprises:
S141, the dtmf code table corresponding according to PCM data query, draw corresponding DTMF code.
Based on a DTMF coding/decoding method for bluetooth, wherein, comprise the following steps:
S21, DTMF code is converted into corresponding PCM data;
S22, described PCM data are transmitted to the bluetooth module of onboard system by CPU;
The PCM data transformations received is corresponding voice analog signal by S23, described bluetooth module;
S24, described voice analog signal is sent to the outside bluetooth with bluetooth module communication.
Based on a DTMF decode system for bluetooth, wherein, comprising:
Bluetooth module, the voice analog signal for receiving with outside bluetooth communication is converted into PCM Data Concurrent and gives CPU; Also for being that corresponding voice analog signal sends to the outside bluetooth with its communication by the PCM received from CPU data transformations;
CPU, for by the PCM data retransmission of bluetooth module to software layer; Also for by the PCM data retransmission of software layer to bluetooth module;
Software layer, for reading the PCM data in CPU, is saved in FIFO internal memory, then is corresponding DTMF code by described PCM data transformations; Also for DTMF code is converted into corresponding PCM data;
FIFO internal memory, for preserving PCM data.
The described DTMF decode system based on bluetooth, wherein, described software layer comprises:
Driver module, for reading the PCM data in CPU;
Modular converter, for being corresponding DTMF code by PCM data transformations, and is converted into corresponding PCM data by DTMF code.
The described DTMF decode system based on bluetooth, wherein, described software layer also comprises:
Detection module, for detecting dialing in DTMF code or digital information.
The described DTMF decode system based on bluetooth, wherein, also comprises:
Output equipment, for the Detection Information in output detections module.
Beneficial effect:
DTMF coding/decoding method based on bluetooth of the present invention and system, under Android, Linux, WinCE, Unix or Apple OS operating system, received the voice analog signal of outside bluetooth, and be converted into PCM data by the bluetooth module of onboard system; Described PCM data are sent to CPU by bluetooth module; Read the PCM data in CPU again, be saved in FIFO internal memory; Be finally corresponding DTMF code by described PCM data transformations; By bluetooth, voice analog signal is converted into PCM data to transmit, be DTMF code by PCM data transformations again, thus achieve DTMF decoding, thus without the need to independent decoding chip, reduce cost, complicated dtmf code can be processed simultaneously, even if car machine there is no sound card, also do not draw ADC pin, also can carry out DTMF decoding.
Accompanying drawing explanation
Fig. 1 is the flow chart of DTMF coding/decoding method first embodiment based on bluetooth of the present invention.
Fig. 2 is the corresponding software flow pattern of DTMF coding/decoding method first embodiment based on bluetooth of the present invention.
Fig. 3 is the flow chart of DTMF coding/decoding method second embodiment based on bluetooth of the present invention.
Fig. 4 is the corresponding software flow pattern of DTMF coding/decoding method second embodiment based on bluetooth of the present invention.
Fig. 5 is the schematic diagram of the embodiment of the DTMF decode system based on bluetooth of the present invention.
Embodiment
The invention provides a kind of DTMF coding/decoding method based on bluetooth and system, for making object of the present invention, technical scheme and effect clearly, clearly, the present invention is described in more detail below.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1, it is the flow chart of DTMF coding/decoding method first embodiment based on bluetooth of the present invention.As shown in the figure, the described DTMF coding/decoding method based on bluetooth, wherein, comprises the following steps:
The bluetooth module of S11, onboard system and outside bluetooth communication, be converted into PCM data by the voice analog signal of the outside bluetooth received;
Described PCM data are sent to CPU by S12, described bluetooth module;
S13, the PCM data read in CPU, and be saved in FIFO internal memory;
S14, be corresponding DTMF code by described PCM data transformations.
Be described in detail for above-mentioned steps respectively below.
Described step S11 is according to user instruction, and bluetooth module and outside bluetooth carry out communication, is that bluetooth module on onboard system and outside mobile phone or other bluetooths carry out communication, thus carries out interactive voice during practical application.The voice analog signal received is converted into PCM data by the bluetooth module of onboard system again.PCM is the abbreviation of English Pulse-code modulation, and Chinese translation is pulse code modulation.We know in actual life, the sound that people's ear is heard is analog signal, PCM is exactly a kind of technology that sound will be become digital signal from analog-converted, its principle is exactly briefly utilize a fixing frequency to analog signal sampling, the pulse that signal after sampling differs just as a string continuous print amplitude at waveform, the amplitude of these pulses is quantized by certain precision, numerical value after these quantifications is exported continuously, is transmitted, processed or is recorded in storage medium, and all these constitute the production process of digital audio.The file format of described PCM data is PCM code, and the voice analog signal received with outside bluetooth communication is converted into corresponding PCM code by bluetooth module, and in step s 12, PCM data are sent to CPU by described bluetooth module.
Step S13 is the PCM data that the driver in software layer reads in ARM CPU, also the PCM data of reading is sent in FIFO internal memory and preserves, thus facilitates follow-up reading PCM data and separate as DTMF code.Described FIFO(First Input First Output) in save as first-in first-out memory.
PCM data transformations, for being corresponding DTMF code by described PCM data transformations, specifically, in software layer, can be corresponding DTMF code by corresponding algorithm by step S14.In this patent, adopt look-up table, according to PCM data query dtmf code table, thus draw corresponding DTMF code, thus the DTMF achieved based on bluetooth decodes.
Further, refer to Fig. 2, Fig. 2 is the corresponding software flow pattern of DTMF coding/decoding method first embodiment based on bluetooth of the present invention, as shown in the figure, also comprised before described step S11: bluetooth module and the outside bluetooth of S10, onboard system are matched, after pairing completes, dialing enters talking state.Specifically, bluetooth module and outside mobile phone or other bluetooth are matched, and after pairing completes, start dialing, enter talking state.This is prior art, does not do too much explanation herein.
Further, also comprise after described step S14: the dialing in S15, detection DTMF code or digital information, exported by output equipment.Specifically, comprise dialing and voice command information in described DTMF code, after PCM data transformations is DTMF code, then DTMF code is reduced to initial data, thus carries out follow-up process.
When embody rule, bluetooth module has two: one to be order transmission based on serial ports to the communication connection of ARM CPU, two is the voice digital signals based on pcm encoder, after PCM code is delivered to ARM, the mode that the systems such as WinCE, Linux, Unix, Android, Apple OS all can drive is read, be translated into DTMF code, thus realize DTMF decoding.DTMF coding/decoding method based on bluetooth provided by the invention, without the need to independent decoding chip, reduces cost, can process complicated dtmf code simultaneously, even if car machine does not have sound card also do not draw ADC pin, also can carry out DTMF decoding.
Above-mentioned DTMF coding/decoding method first embodiment based on bluetooth is for receiving flow process, and namely the voice analog signal of outside bluetooth communication enters the DTMF decoding process of the DTMF decode system based on bluetooth of the present invention.Accordingly, the DTMF coding/decoding method based on bluetooth provided by the invention also comprises transmission flow, and namely DTMF decoding is sent to the flow process of outside bluetooth by the DTMF decode system based on bluetooth of the present invention.
Further, refer to Fig. 3, Fig. 3 is the flow chart of DTMF coding/decoding method second embodiment based on bluetooth of the present invention.Described first embodiment is the transmission flow of reception flow process, corresponding first embodiment of this second embodiment.As shown in Figure 3, the described DTMF coding/decoding method based on bluetooth, comprises the following steps:
S21, DTMF code is converted into corresponding PCM data;
S22, described PCM data are transmitted to the bluetooth module of onboard system by CPU;
The PCM data transformations received is corresponding voice analog signal by S23, described bluetooth module;
S24, described voice analog signal is sent to the outside bluetooth with bluetooth module communication.
Specifically, the flow chart of described second embodiment is corresponding with the flow chart of the first embodiment, in the step s 21, the DTMF code comprising dialing or digital information is converted into corresponding PCM data, the bluetooth module of onboard system is sent to again by ARM CPU, be that then corresponding voice analog signal sends to outside bluetooth through bluetooth module by described PCM data transformations, thus achieve the transmission of DTMF decoding.Refer to Fig. 4, Fig. 4 is the corresponding software flow pattern of DTMF coding/decoding method second embodiment based on bluetooth of the present invention.Obviously, in this second embodiment, the bluetooth module of onboard system and the pairing of outside bluetooth is also comprised, and dtmf signal is converted into PCM data, this is DTMF code to the PCM data transformations in the first embodiment is corresponding flow process, and its operation principle too, no longer repeats herein.
Present invention also offers a kind of DTMF decode system based on bluetooth, as shown in Figure 5, described DTMF decode system comprises: bluetooth module 10, CPU20, software layer 30 and FIFO internal memory 40.
Specifically, described bluetooth module 10 is converted into PCM Data Concurrent for the voice analog signal received with outside bluetooth communication and gives CPU20; Also for being that corresponding voice analog signal sends to the outside bluetooth with its communication by the PCM received from CPU20 data transformations.Described CPU20 is used for the PCM data retransmission of bluetooth module 10 to software layer 30; Also for by the PCM data retransmission of software layer 30 to bluetooth module 10.Described software layer 30, for reading the PCM data in CPU20, is saved in FIFO internal memory 40, then is corresponding DTMF code by described PCM data transformations; Also for DTMF code is converted into corresponding PCM data.Described FIFO internal memory 40 is for preserving PCM data.Described bluetooth module 10 and CPU20 are hardware layer.
Receive flow process and transmission flow because DTMF decoding process comprises, then the signal transacting in described bluetooth module 10, CPU20, software layer 30 and FIFO internal memory 40 is all two-way.When practical application, in reception flow process, the voice analog signal received with outside bluetooth communication is converted into PCM Data Concurrent and gives CPU20 by described bluetooth module 10, software layer 30 is transmitted to through described CPU20, described PCM data are kept in FIFO internal memory 40 by described software layer 30, and be translated into corresponding DTMF code, thus achieve DTMF decoding.Described bluetooth module 10 and the communication connection of ARM CPU20 have two: one to be order transmission for serial ports, two is the voice digital signal transmission for pcm encoder, ARM is given by PCM code, the mode that such WinCE, Linux, Unix, Android, Apple OS all can drive is read, and realizes DTMF decoding.
Specifically, described software layer 30 comprises: driver module, for reading the PCM data in CPU; Modular converter, for being corresponding DTMF code by PCM data transformations, and is converted into corresponding PCM data by DTMF code.Further, described software layer 30 also comprises: detection module, for detecting dialing in DTMF code or digital information.Dialing in DTMF code or digital information detect by described detection module, and export on an output device, and described output equipment is loudspeaker etc.
When practical application, in transmission flow, DTMF code is converted into corresponding PCM data by described software layer 30, then bluetooth module 10 is sent to by CPU20, PCM data transformations is corresponding voice analog signal by described bluetooth module 10, again with outside bluetooth communication, thus be sent in other receiving body, thus achieve DTMF decoding.
In sum, DTMF coding/decoding method based on bluetooth of the present invention and system, under Android, Linux, WinCE, Unix or Apple OS operating system, recorded the voice analog signal receiving outside bluetooth by the bluetooth of onboard system, and be converted into PCM data; Described PCM data are sent to CPU by bluetooth module; Driver reads the PCM data in CPU, is saved in FIFO internal memory; Be corresponding DTMF code by described PCM data transformations; Correspondingly, the DTMF code in onboard system is converted into corresponding PCM data; The bluetooth module of onboard system is transmitted to again by CPU; The PCM data transformations received is corresponding voice analog signal by described bluetooth module; Finally described voice analog signal is sent to the outside bluetooth with bluetooth module communication, thus achieve the DTMF decoding of reception and transmission flow, thus without the need to independent decoding chip, reduce cost, complicated dtmf code can be processed simultaneously, car machine when not having sound card also not draw ADC pin, also can carry out DTMF decoding.
Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection range that all should belong to claims of the present invention.
Claims (4)
1., based on a DTMF coding/decoding method for bluetooth, it is characterized in that, comprise the following steps:
The bluetooth module of S11, onboard system and outside bluetooth communication, be converted into PCM data by the voice analog signal of the outside bluetooth received;
Described PCM data are sent to CPU by S12, described bluetooth module;
S13, software layer read the PCM data in CPU, and are saved in FIFO internal memory;
S14, in software layer, be corresponding DTMF code by described PCM data transformations;
Also comprise after described step S14:
Dialing in S15, detection DTMF code or digital information, exported by output equipment;
Comprise dialing and voice command information in described DTMF code, after PCM data transformations is DTMF code, then the reduction of DTMF code is obtained corresponding dialing and voice command information;
Described step S14 specifically comprises:
S141, the dtmf code table corresponding according to PCM data query, draw corresponding DTMF code.
2. the DTMF coding/decoding method based on bluetooth according to claim 1, is characterized in that, also comprised before described step S11:
Bluetooth module and the outside bluetooth of S10, onboard system are matched, and after pairing completes, dialing enters talking state.
3., based on a DTMF coding/decoding method for bluetooth, it is characterized in that, comprise the following steps:
S21, in software layer, DTMF code is converted into corresponding PCM data; The dtmf code table corresponding according to the inquiry of DTMF code, is converted into corresponding PCM data by the DTMF code comprising dialing or digital information;
Described PCM data are transmitted to the bluetooth module of onboard system by S22, software layer by CPU;
The PCM data transformations received is corresponding voice analog signal by S23, described bluetooth module;
S24, described voice analog signal is sent to the outside bluetooth with bluetooth module communication.
4., based on a DTMF decode system for bluetooth, it is characterized in that, comprising:
Bluetooth module, gives CPU for the voice analog signal received with outside bluetooth communication is converted into PCM Data Concurrent; Also for being that corresponding voice analog signal sends to the outside bluetooth with its communication by the PCM received from CPU data transformations;
CPU, for by the PCM data retransmission of bluetooth module to software layer; Also for by the PCM data retransmission of software layer to bluetooth module;
Software layer, for reading the PCM data in CPU, is saved in FIFO internal memory, then is corresponding DTMF code by described PCM data transformations; Also for DTMF code is converted into corresponding PCM data;
FIFO internal memory, for preserving PCM data;
Described software layer comprises:
Driver module, for reading the PCM data in CPU;
Modular converter, for being corresponding DTMF code by PCM data transformations, and is converted into corresponding PCM data by DTMF code;
Described software layer also comprises:
Detection module, for detecting dialing in DTMF code or digital information;
Also comprise:
Output equipment, for the Detection Information in output detections module;
Described modular converter, for the dtmf code table corresponding according to PCM data query, draws corresponding DTMF code; And the dtmf code table corresponding according to the inquiry of DTMF code, draw corresponding PCM data;
Comprise dialing and voice command information in described DTMF code, after PCM data transformations is DTMF code by described modular converter, then by described detection module, the reduction of DTMF code is obtained corresponding dialing and voice command information;
The DTMF code comprising dialing or digital information is converted into corresponding PCM data by described modular converter, being sent to the bluetooth module of onboard system again by CPU, is that then corresponding voice analog signal sends to outside bluetooth through bluetooth module by described PCM data transformations.
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| CN111313984B (en) * | 2020-02-19 | 2022-02-18 | 北京瑞森新谱科技股份有限公司 | Testing device and method for various audio codes of Bluetooth headset |
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| CN102143270A (en) * | 2011-04-08 | 2011-08-03 | 广东好帮手电子科技股份有限公司 | Mobile phone car telephone communication method and device on the basis of bluetooth function |
| CN102625240A (en) * | 2012-03-30 | 2012-08-01 | 广东翼卡车联网服务有限公司 | Method for realizing setting of navigating destination through bluetooth push-to-talk |
| CN202524464U (en) * | 2012-04-05 | 2012-11-07 | 郭春季 | Voice navigation system based on fixed telephone |
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| CN102143270A (en) * | 2011-04-08 | 2011-08-03 | 广东好帮手电子科技股份有限公司 | Mobile phone car telephone communication method and device on the basis of bluetooth function |
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