CN112751979B - DTMF coding and decoding method, coder, decoder and communication device - Google Patents
DTMF coding and decoding method, coder, decoder and communication device Download PDFInfo
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- CN112751979B CN112751979B CN202011606640.9A CN202011606640A CN112751979B CN 112751979 B CN112751979 B CN 112751979B CN 202011606640 A CN202011606640 A CN 202011606640A CN 112751979 B CN112751979 B CN 112751979B
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- 238000004891 communication Methods 0.000 title claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 57
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- 238000010586 diagram Methods 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
- H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
- H04M7/1295—Details of dual tone multiple frequency signalling
Abstract
The invention discloses a DTMF coding and decoding method, a coder, a decoder and a communication device. The DTMF coding method comprises the following steps: acquiring digital information to be transmitted; converting the digital information to be transmitted into a frequency signal; generating a preset high-frequency signal; superposing the frequency signal and the high-frequency signal to form a target transmission signal; and transmitting the target transmission signal. By mixing the high-frequency anti-interference signal into the DTMF frequency signal to be transmitted, the probability of being interfered in the transmission process of the DTMF is greatly reduced, and the false alarm and false alarm caused by the interference of the signal are effectively reduced.
Description
Technical Field
The present invention relates to the field of dual tone multi frequency communication technology, and in particular, to a DTMF (Dual Tone Multi Frequency ) encoding and decoding method, an encoder, a decoder, and a communication device.
Background
DTMF is a method of representing digits with tones in a voice channel, and can be used to transmit signaling in an analog voice channel, so that it has wide application in the field of communication. The DTMF is composed of a high frequency group and a low frequency group, each of which contains 4 frequencies, and a high frequency signal and a low frequency signal are superimposed to form a combined signal representing a number.
In the popularization process of the internet of things, communication equipment is not limited to communication equipment such as mobile phones, more and more equipment supports a voice communication function, and daily equipment such as vending machines, automobiles, even elevators and the like can be connected to the internet of things and can communicate with users in voice. The frequency points of the DTMF are all in the frequency point range of 600Hz to 1700Hz, and the frequency range is the frequency range most frequently used in voice communication, so that the probability of being interfered in the coding and decoding processes of the traditional DTMF is relatively larger along with the popularization of the Internet of things. When the DTMF is transmitted through voice, the common false alarm types include false alarm, missing alarm and multiple alarms. Wherein, when the interference frequency falls in the high frequency group and the low frequency group of the DTMF, the false alarm or multiple alarm is caused.
Disclosure of Invention
The invention aims to overcome the defects of easy occurrence of false alarm and multiple alarms in the transmission process of DTMF in the prior art, and provides a DTMF coding and decoding method, a coder, a decoder and a communication device.
The invention solves the technical problems by the following technical scheme:
the invention provides a DTMF coding method, which comprises the following steps:
acquiring digital information to be transmitted;
converting the digital information to be transmitted into a frequency signal;
generating a preset high-frequency signal;
superposing the frequency signal and the high-frequency signal to form a target transmission signal;
and transmitting the target transmission signal.
Preferably, the frequency of the preset high-frequency signal is greater than or equal to 10KHz.
Preferably, after the step of superimposing the frequency signal and the high frequency signal to form a target transmission signal, the DTMF encoding method further includes:
the target transmission signal is converted from a digital signal to an analog signal.
The invention also provides a DTMF decoding method, which comprises the following steps:
receiving a signal to be decoded;
detecting whether the to-be-decoded transmission signal comprises a preset high-frequency signal or not;
if yes, decoding the to-be-decoded sending signal to obtain target digital information, and outputting the target digital information; if not, outputting the signal to be decoded to be transmitted abnormally.
Preferably, after the step of receiving the transmission signal to be decoded, the DTMF decoding method further comprises:
and converting the transmission signal to be decoded from an analog signal to a digital signal.
The invention also provides a DTMF encoder, which comprises an input module, an encoding module and a sending module; the coding module comprises a high-frequency anti-interference unit;
the input module is used for acquiring digital information to be sent;
the coding module is used for converting the digital information to be transmitted into a frequency signal;
the high-frequency anti-interference unit is used for generating a preset high-frequency signal;
the encoding module is also used for superposing the frequency signal and the high-frequency signal to form a target transmission signal;
the sending module is used for sending the target sending signal.
Preferably, the frequency of the preset high-frequency signal is greater than or equal to 10KHz.
Preferably, the DTMF encoder further comprises a digital-to-analog conversion module;
the digital-to-analog conversion module is used for converting the target sending signal from a digital signal to an analog signal.
The invention also provides a DTMF decoder, which comprises a receiving module, a decoding module and an output module; the decoding module comprises a start bit detection unit, a decoding unit and an exception processing unit;
the receiving module is used for receiving a signal to be decoded;
the start bit detection unit is used for detecting whether the to-be-decoded sending signal comprises a preset high-frequency signal, if yes, the decoding unit is called, and if not, the exception processing unit is called;
the decoding unit is used for decoding the to-be-decoded sending signal to obtain target digital information, and calling the output module;
the exception processing unit is used for outputting the exception of the transmission signal to be decoded.
The output module is used for outputting the target digital information.
Preferably, the DTMF decoder further comprises an analog-to-digital conversion module;
the analog-to-digital conversion module is used for converting the to-be-decoded transmission signal from an analog signal to a digital signal.
The present invention also provides a DTMF communication device comprising a DTMF encoder as described above and a DTMF decoder as described above;
the DTMF encoder is used for sending the target sending signal to the DTMF decoder;
the DTMF decoder is used for receiving the target sending signal to acquire the sending signal to be decoded.
The invention has the positive progress effects that:
by mixing the high-frequency anti-interference signal into the DTMF frequency signal to be transmitted, the probability of being interfered in the transmission process of the DTMF is greatly reduced, and the false alarm and false alarm caused by the interference of the signal are effectively reduced.
Drawings
Fig. 1 is a flowchart of a DTMF encoding method according to embodiment 1 of the present invention.
Fig. 2 is a conventional DTMF encoding of the character "6" in the prior art.
Fig. 3 is a DTMF code obtained by the DTMF coding method of embodiment 1 for character "6".
Fig. 4 is a flowchart of a DTMF decoding method according to embodiment 2 of the present invention.
Fig. 5 is a schematic block diagram of a DTMF encoder according to embodiment 4 of the present invention.
Fig. 6 is a schematic block diagram of a DTMF decoder according to embodiment 5 of the present invention.
Fig. 7 is a schematic block diagram of a DTMF communication device according to embodiment 6 of the present invention.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, the present embodiment provides a DTMF encoding method, which includes:
s101, acquiring digital information to be transmitted;
s102, converting digital information to be transmitted into a frequency signal;
s103, generating a preset high-frequency signal;
s104, superposing the frequency signal and the high-frequency signal to form a target transmission signal;
s105, converting the target transmission signal from a digital signal to an analog signal;
s106, sending a target sending signal.
Specifically, the frequency of the preset high-frequency signal is greater than or equal to 10KHz.
It is known in the art that DTMF can lock a character by only two frequency points in the encoding and decoding processes, the mode is simpler, the efficiency is higher, and as shown in fig. 2, the character "6" is locked by 770Hz and 1477 Hz. When DTMF is transmitted by voice, the frequency of the interference signal is generally smaller than 10KHz, especially in the frequency range of 600Hz to 1700Hz, and the probability of being interfered is very high. Whereas in the frequency range above 10KHz the probability of being disturbed is very small. As shown in fig. 3, the frequency signal of character "6" contains three frequency components of 770hz,1477hz, and 10KHz based on the DTMF coding method of the present embodiment. In the encoding process, an interference signal greater than or equal to 10KHz is mixed in the transmission signal, so that the probability of interference of DTMF in the transmission process can be effectively reduced.
According to the DTMF coding method, the high-frequency anti-interference signal is mixed into the frequency signal to be transmitted, so that the probability of being interfered in the transmission process of the DTMF is greatly reduced, and the situation of false alarm and false alarm caused by the interference of the signal is effectively reduced.
Example 2
As shown in fig. 4, the present embodiment provides a DTMF decoding method, which includes:
s201, receiving a transmission signal to be decoded;
s202, converting a transmission signal to be decoded from an analog signal to a digital signal;
s203, detecting whether the signal to be decoded comprises a preset high-frequency signal, if so, executing step S204, and if not, executing step S205;
s204, decoding the signal to be decoded to obtain target digital information and outputting the target digital information; the flow ends.
S205, outputting an abnormality of the transmission signal to be decoded to remind of further processing, for example, the transmission signal to be decoded can be abandoned.
According to the DTMF coding method, whether the high-frequency anti-interference signal is mixed in the frequency signal is detected, decoding is carried out only when the frequency signal comprises the high-frequency anti-interference signal, and false alarm caused by interference of the signal are effectively reduced by adding the high-frequency anti-interference signal.
Example 3
The present embodiment provides a DTMF communication method that encodes digital information by using the DTMF encoding method in embodiment 1 to obtain a transmission signal, and decodes the transmission signal by using the DTMF decoding method in embodiment 2 to obtain digital information.
According to the DTMF communication method, the probability of being interfered in the transmission process of the DTMF is greatly reduced by mixing the high-frequency anti-interference signal into the frequency signal to be transmitted; when receiving signals, the method detects whether the high-frequency anti-interference signals are mixed in the frequency signals, and decodes the frequency signals only when the frequency signals comprise the high-frequency anti-interference signals, so that false alarm and false alarm caused by interference of the signals are effectively reduced.
Example 4
As shown in fig. 5, the present embodiment provides a DTMF encoder, which includes an input module 11, an encoding module 12, a transmitting module 13, and a digital-to-analog conversion module 14; the encoding module 12 includes a high-frequency interference prevention unit 121.
The input module 11 is used for acquiring digital information to be sent;
the encoding module 12 is used for converting digital information to be transmitted into a frequency signal;
the high-frequency anti-interference unit 121 is configured to generate a preset high-frequency signal;
the encoding module 12 is further configured to superimpose the frequency signal and the high-frequency signal to form a target transmission signal;
the transmitting module 13 is configured to transmit a target transmission signal.
The digital-to-analog conversion module 14 is used to convert the target transmission signal from a digital signal to an analog signal.
It is known in the art that DTMF can lock a character by only two frequency points in the encoding and decoding processes, the mode is simpler, the efficiency is higher, and as shown in fig. 2, the character "6" is locked by 770Hz and 1477 Hz. When DTMF is transmitted by voice, the frequency of the interference signal is generally smaller than 10KHz, especially in the frequency range of 600Hz to 1700Hz, and the probability of being interfered is very high. Whereas in the frequency range above 10KHz the probability of being disturbed is very small. As shown in fig. 3, the frequency signal of character "6" contains three frequency components of 770hz,1477hz, and 10KHz based on the DTMF coding method of the present embodiment. In the encoding process, an interference signal greater than or equal to 10KHz is mixed in the transmission signal, so that the probability of interference of DTMF in the transmission process can be effectively reduced.
According to the DTMF coder, the high-frequency anti-interference signal is mixed into the frequency signal to be transmitted, so that the probability of interference of the DTMF in the transmission process is greatly reduced, and the false alarm and false alarm caused by interference of the signal are effectively reduced.
Example 5
As shown in fig. 6, the present embodiment provides a DTMF decoder comprising a receiving module 21, a decoding module 22, an output module 23 and an analog-to-digital conversion module 24; the decoding module 22 includes a start bit detection unit 221, a decoding unit 222, and an exception processing unit 223.
The receiving module 21 is configured to receive a transmission signal to be decoded;
the start bit detection unit 221 is configured to detect whether the signal to be decoded includes a preset high-frequency signal, if yes, call the decoding unit 222, and if not, call the exception processing unit 223;
the decoding unit 222 is configured to decode the transmission signal to be decoded to obtain target digital information, and call the output module 23;
the exception handling unit 223 is configured to output an exception of the transmission signal to be decoded, so as to alert further processing or direct processing, for example, decoding the transmission signal to be decoded may be abandoned.
The output module 23 is used for outputting target digital information;
the analog-to-digital conversion module 24 is used for converting the transmission signal to be decoded from an analog signal to a digital signal.
According to the DTMF coding method, whether the high-frequency anti-interference signal is mixed in the frequency signal is detected, the high-frequency anti-interference signal is decoded only when the frequency signal comprises the high-frequency anti-interference signal, and false alarm caused by interference of the signal are effectively reduced by the high-frequency anti-interference signal mode.
Example 6
As shown in fig. 7, the present embodiment provides a DTMF communication device including a DTMF encoder 31 of embodiment 4 and a DTMF decoder 32 of embodiment 5.
The DTMF encoder is used for sending the target sending signal to the DTMF decoder;
the DTMF decoder is used for receiving the target transmission signal to acquire a transmission signal to be decoded.
According to the DTMF communication device, the probability of being interfered in the transmission process of the DTMF is greatly reduced by mixing the high-frequency anti-interference signal into the frequency signal to be transmitted; when receiving signals, the method detects whether the high-frequency anti-interference signals are mixed in the frequency signals, and decodes the frequency signals only when the frequency signals comprise the high-frequency anti-interference signals, so that false alarm and false alarm caused by interference of the signals are effectively reduced.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (9)
1. A DTMF encoding method, the DTMF encoding method comprising:
acquiring digital information to be transmitted;
converting the digital information to be transmitted into a frequency signal;
generating a preset high-frequency signal; wherein the frequency of the preset high-frequency signal is more than or equal to 10KHz;
superposing the frequency signal and the high-frequency signal to form a target transmission signal; wherein the target transmission signal contains a frequency component of the frequency signal and a frequency component of the high frequency signal;
and transmitting the target transmission signal.
2. The DTMF encoding method of claim 1, wherein after the step of superimposing the frequency signal and the high frequency signal to form a target transmission signal, the DTMF encoding method further comprises:
the target transmission signal is converted from a digital signal to an analog signal.
3. A DTMF decoding method, the DTMF decoding method comprising:
receiving a signal to be decoded; wherein the transmission signal to be decoded is a target transmission signal transmitted by using the DTMF coding method of any one of claims 1-2;
detecting whether the to-be-decoded transmission signal comprises a preset high-frequency signal or not;
if yes, decoding the to-be-decoded sending signal to obtain target digital information, and outputting the target digital information; if not, outputting the signal to be decoded to be transmitted abnormally.
4. The DTMF decoding method of claim 3, wherein after the step of receiving a transmission signal to be decoded, the DTMF decoding method further comprises:
and converting the transmission signal to be decoded from an analog signal to a digital signal.
5. A DTMF encoder, wherein the DTMF encoder comprises an input module, an encoding module and a transmitting module; the coding module comprises a high-frequency anti-interference unit;
the input module is used for acquiring digital information to be sent;
the coding module is used for converting the digital information to be transmitted into a frequency signal;
the high-frequency anti-interference unit is used for generating a preset high-frequency signal; wherein the frequency of the preset high-frequency signal is more than or equal to 10KHz;
the encoding module is also used for superposing the frequency signal and the high-frequency signal to form a target transmission signal; wherein the target transmission signal contains a frequency component of the frequency signal and a frequency component of the high frequency signal;
the sending module is used for sending the target sending signal.
6. The DTMF encoder of claim 5, wherein the DTMF encoder further comprises a digital-to-analog conversion module;
the digital-to-analog conversion module is used for converting the target sending signal from a digital signal to an analog signal.
7. A DTMF decoder, wherein the DTMF decoder comprises a receiving module, a decoding module and an output module; the decoding module comprises a start bit detection unit, a decoding unit and an exception processing unit;
the receiving module is used for receiving a signal to be decoded; wherein the transmission signal to be decoded is a target transmission signal transmitted using the DTMF encoder of any one of claims 5-6;
the start bit detection unit is used for detecting whether the to-be-decoded sending signal comprises a preset high-frequency signal, if yes, the decoding unit is called, and if not, the exception processing unit is called;
the decoding unit is used for decoding the to-be-decoded sending signal to obtain target digital information, and calling the output module;
the exception processing unit is used for outputting the exception of the transmission signal to be decoded;
the output module is used for outputting the target digital information.
8. The DTMF decoder of claim 7, wherein the DTMF decoder further comprises an analog-to-digital conversion module;
the analog-to-digital conversion module is used for converting the to-be-decoded transmission signal from an analog signal to a digital signal.
9. A DTMF communication device, characterized in that it comprises a DTMF encoder according to any one of claims 5-6 and a DTMF decoder according to any one of claims 7-8;
the DTMF encoder is used for sending a target sending signal to the DTMF decoder;
the DTMF decoder is used for receiving the target sending signal to acquire a sending signal to be decoded.
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