CN115550495B - Filtering method and device for dual-tone multi-frequency signals - Google Patents
Filtering method and device for dual-tone multi-frequency signals Download PDFInfo
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- CN115550495B CN115550495B CN202211071018.1A CN202211071018A CN115550495B CN 115550495 B CN115550495 B CN 115550495B CN 202211071018 A CN202211071018 A CN 202211071018A CN 115550495 B CN115550495 B CN 115550495B
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- 238000001914 filtration Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005070 sampling Methods 0.000 claims description 42
- 230000009977 dual effect Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
- H04M1/663—Preventing unauthorised calls to a telephone set
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/436—Arrangements for screening incoming calls, i.e. evaluating the characteristics of a call before deciding whether to answer it
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
- H04M7/0078—Security; Fraud detection; Fraud prevention
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephone Function (AREA)
- Telephonic Communication Services (AREA)
Abstract
The invention discloses a method and a device for filtering dual-tone multi-frequency signals, wherein the method comprises the following steps: acquiring the frequency of the pulse code modulation audio data to be processed, and comparing the frequency of the pulse code modulation audio data to be processed with the frequency of a preset dual-tone multi-frequency signal to generate a first comparison result; and judging that the frequency of the pulse code modulation audio data to be processed is consistent with the frequency of the preset dual-tone multi-frequency signal according to the first comparison result, and filtering the pulse code modulation audio data to be processed if the frequency of the pulse code modulation audio data to be processed is judged to comprise the dual-tone multi-frequency signal corresponding to a certain mobile phone key. By adopting the embodiment of the invention, the real-time performance of the call is improved.
Description
Technical Field
The present invention relates to the field of data processing technologies, and in particular, to a method and an apparatus for filtering dual-tone multi-frequency signals.
Background
In the call process, a recording device is often used on mobile phone hardware to record call voice, and after the recording content is detected by using an interception device, matching interception is performed according to the characteristics of DTMF (dual tone multi frequency) keys and black/gray list numbers.
However, in the prior art, the recognition and filtering operations of DTMF are performed on hardware, a special interception device and an external call evidence obtaining device are needed to be used on hardware, a recording evidence obtaining device is used for recording voice content, then a special interception device is used for analyzing the call process, and the DTMF key-press behavior is detected.
The above-mentioned method can solve the problem that the existing filtering method of dual-tone multi-frequency signals can cause poor real-time performance of the call.
Disclosure of Invention
The embodiment of the invention provides a method and a device for filtering dual-tone multi-frequency signals, which improve the real-time performance of conversation.
A first aspect of an embodiment of the present application provides a method for filtering a dual-tone multi-frequency signal, including:
acquiring the frequency of the pulse code modulation audio data to be processed, and comparing the frequency of the pulse code modulation audio data to be processed with the frequency of a preset dual-tone multi-frequency signal to generate a first comparison result;
if the frequency of the pulse code modulation audio data to be processed is judged to be consistent with the frequency of the preset dual-tone multi-frequency signal according to the first comparison result, the frequency of the pulse code modulation audio data to be processed is judged to comprise the dual-tone multi-frequency signal corresponding to a certain mobile phone key, and the pulse code modulation audio data to be processed is filtered.
In a possible implementation manner of the first aspect, the method further includes:
and if the frequency of the pulse code modulation audio data to be processed is not consistent with the frequency of the preset DTMF signal according to the first comparison result, sending the pulse code modulation audio data to be processed to a call opposite terminal.
In a possible implementation manner of the first aspect, the frequency of the pulse code modulated audio data to be processed is obtained, specifically:
receiving original pulse code modulated audio data from a wired network or a wireless network;
and carrying out sampling processing on the original pulse code modulation audio data according to the first sampling rate and combining with a Goertzel algorithm to generate pulse code modulation audio data to be processed, and obtaining the frequency of the pulse code modulation audio data to be processed.
In a possible implementation manner of the first aspect, the pulse code modulated audio data to be processed is filtered, specifically:
the original pulse code modulation audio data is subjected to sampling processing again according to the second sampling rate and by combining with a Goertzel algorithm, and a first processing result is generated; wherein the second sampling rate is greater than the first sampling rate;
and calculating the precision of the first processing result, and setting the partial DTMF signal in the pulse code modulation audio data to be processed to 0x00 when the precision of the first processing result meets the preset precision condition, so as to finish the filtering processing of the pulse code modulation audio data to be processed.
In a possible implementation manner of the first aspect, when the accuracy of the first processing result meets a preset accuracy condition, the method further includes:
and when detecting that other common audios exist in the pulse code modulation audio data to be processed, storing the pulse code modulation audio data to be processed.
In a possible implementation manner of the first aspect, the method further includes:
when the precision of the first processing result does not meet the preset precision condition, the sampling rate is increased, the Goertzel algorithm is combined to conduct sampling processing on the original pulse code modulation audio data again, and a new processing result is generated until the precision of the new processing result meets the preset precision condition.
A second aspect of an embodiment of the present application provides a filtering apparatus for a dual-tone multi-frequency signal, including: a comparison module and a filtering module;
the comparison module is used for obtaining the frequency of the pulse code modulation audio data to be processed, comparing the frequency of the pulse code modulation audio data to be processed with the frequency of the preset dual-tone multi-frequency signal and generating a first comparison result;
and the filtering module is used for judging that the frequency of the pulse code modulation audio data to be processed comprises a dual-tone multi-frequency signal corresponding to a certain mobile phone key if the frequency of the pulse code modulation audio data to be processed is judged to be consistent with the frequency of the preset dual-tone multi-frequency signal according to the first comparison result, and filtering the pulse code modulation audio data to be processed.
In a possible implementation manner of the second aspect, the method further includes:
and if the frequency of the pulse code modulation audio data to be processed is not consistent with the frequency of the preset DTMF signal according to the first comparison result, sending the pulse code modulation audio data to be processed to a call opposite terminal.
In a possible implementation manner of the second aspect, the frequency of the pulse code modulated audio data to be processed is obtained, specifically:
receiving original pulse code modulated audio data from a wired network or a wireless network;
and carrying out sampling processing on the original pulse code modulation audio data according to the first sampling rate and combining with a Goertzel algorithm to generate pulse code modulation audio data to be processed, and obtaining the frequency of the pulse code modulation audio data to be processed.
In a possible implementation manner of the second aspect, the pulse code modulated audio data to be processed is filtered, specifically:
the original pulse code modulation audio data is subjected to sampling processing again according to the second sampling rate and by combining with a Goertzel algorithm, and a first processing result is generated; wherein the second sampling rate is greater than the first sampling rate;
and calculating the precision of the first processing result, and setting the partial DTMF signal in the pulse code modulation audio data to be processed to 0x00 when the precision of the first processing result meets the preset precision condition, so as to finish the filtering processing of the pulse code modulation audio data to be processed.
Compared with the prior art, the method and the device for filtering the dual-tone multi-frequency signal provided by the embodiment of the invention comprise the following steps: acquiring the frequency of the pulse code modulation audio data to be processed, and comparing the frequency of the pulse code modulation audio data to be processed with the frequency of a preset dual-tone multi-frequency signal to generate a first comparison result; and judging that the frequency of the pulse code modulation audio data to be processed is consistent with the frequency of the preset dual-tone multi-frequency signal according to the first comparison result, and filtering the pulse code modulation audio data to be processed if the frequency of the pulse code modulation audio data to be processed is judged to comprise the dual-tone multi-frequency signal corresponding to a certain mobile phone key.
The beneficial effects are that: according to the embodiment of the invention, whether the pulse code modulation audio data is the dual-tone multi-frequency signal corresponding to a certain mobile phone key is judged through software and filtered, so that the problem of call delay caused by identifying and filtering the dual-tone multi-frequency signal through a hardware interception device and a call evidence obtaining device can be avoided, and the real-time performance of a call is effectively improved while the dual-tone multi-frequency signal is prevented from being transmitted to a call opposite terminal. Meanwhile, on the premise of not needing recording operation, the embodiment of the invention compares the pulse code modulation audio data with the DTMF key signals after converting analog signals into Digital signals, thereby reducing hardware cost, avoiding hardware test and improving the recognition and filtering efficiency of DTMF.
Drawings
Fig. 1 is a flow chart of a filtering method of a dual-tone multi-frequency signal according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of a filtering device for dual-tone multi-frequency signals according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a flow chart of a filtering method of a dual-tone multi-frequency signal according to an embodiment of the present invention includes S101-S102:
s101: the method comprises the steps of obtaining the frequency of pulse code modulation audio data to be processed, comparing the frequency of the pulse code modulation audio data to be processed with the frequency of a preset dual-tone multi-frequency signal, and generating a first comparison result.
The pulse code modulation audio data is PCM audio data; the dual-tone multi-frequency signal is DTMF dual-tone multi-frequency signal.
In this embodiment, the frequency of obtaining the pulse code modulated audio data to be processed is specifically:
receiving original pulse code modulated audio data from a wired network or a wireless network;
and carrying out sampling processing on the original pulse code modulation audio data according to a first sampling rate and combining a Goertzel algorithm to generate the pulse code modulation audio data to be processed, and obtaining the frequency of the pulse code modulation audio data to be processed.
Further, after stopping receiving the original pulse code modulation audio data from the wired network or the wireless network, the CPE system samples the original pulse code modulation audio data according to a Goertzel algorithm. Further, the original pulse code modulated audio data is from VoLTE (Voice over LTE) or VOIP (Voice over Internet Protocol).
S102: if the frequency of the pulse code modulation audio data to be processed is judged to be consistent with the frequency of the preset dual-tone multi-frequency signal according to the first comparison result, the frequency of the pulse code modulation audio data to be processed is judged to comprise the dual-tone multi-frequency signal corresponding to a certain mobile phone key, and the pulse code modulation audio data to be processed is filtered.
In this embodiment, the filtering the pulse code modulated audio data to be processed specifically includes:
the original pulse code modulation audio data is sampled again according to a second sampling rate and combined with the Goertzel algorithm, and a first processing result is generated; wherein the second sampling rate is greater than the first sampling rate;
and calculating the precision of the first processing result, and setting the partial DTMF signal in the pulse code modulation audio data to be processed to be 0x00 when the precision of the first processing result meets a preset precision condition, so as to finish the filtering processing of the pulse code modulation audio data to be processed.
The method comprises the steps of setting a part of DTMF signals in pulse code modulation audio data to be processed to be 0x00, realizing mute processing of the part of DTMF signals, and preventing sound from being heard when a call opposite terminal recognizes 0x00, so that transparent transmission of DTMF can be avoided; meanwhile, other common audio data are reserved, so that the opposite end of the call can hear the common audio, and the sound loss is effectively avoided. Further, after the filtering processing of the pulse code modulation audio data to be processed is completed, a second processing result is generated, and the second processing result is sent to a call opposite terminal.
Meanwhile, under the condition of allowing DTMF transparent transmission, the pulse code modulation audio data to be processed is not needed, the pulse code modulation audio data to be processed is directly sent to the opposite terminal of the call, and at the moment, the opposite terminal of the call can recognize the DTMF signal and perform corresponding processing.
In a specific embodiment, when the accuracy of the first processing result meets the preset accuracy condition, the method further includes:
and when detecting that other common audios exist in the pulse code modulation audio data to be processed, storing the pulse code modulation audio data to be processed.
In a specific embodiment, the method further comprises:
when the precision of the first processing result does not meet the preset precision condition, the sampling rate is increased, the Goertzel algorithm is combined to conduct sampling processing on the original pulse code modulation audio data again, a new processing result is generated until the precision of the new processing result meets the preset precision condition, and the precision of identifying DTMF can be improved.
In a preferred embodiment, when the accuracy of the first processing result is greater than a preset accuracy value, it is determined that the accuracy of the first processing result meets the preset accuracy condition; and when the precision of the first processing result is smaller than a preset precision value, judging that the precision of the first processing result does not meet the preset precision condition.
In this embodiment, further comprising:
and if the frequency of the pulse code modulation audio data to be processed is judged to be inconsistent with the frequency of the preset dual-tone multi-frequency signal according to the first comparison result, the pulse code modulation audio data to be processed is sent to a call opposite terminal.
Further, when the frequency of the pulse code modulation audio data to be processed is inconsistent with the frequency of the preset dual-tone multi-frequency signal, the pulse code modulation audio data to be processed is sent to the SLIC (i.e. the opposite call end), and the CPE is enabled to receive the original pulse code modulation audio data from the wired network or the wireless network again.
For a better illustration, please refer to table 1 in the comparison process of the frequency of the to-be-processed pulse code modulated audio data and the frequency of the preset dual-tone multi-frequency signal, table 1 is a preset dual-tone multi-frequency signal frequency table provided by an embodiment of the present invention.
Table 1 preset dual tone multi frequency signal frequency table
For example, table 1 includes a plurality of preset dtmf signal frequencies, where each preset dtmf signal frequency corresponds to a dtmf signal corresponding to each mobile phone key. For example, when the low frequency of the pulse code modulation audio data to be processed is 678Hz and the high frequency of the pulse code modulation audio data to be processed is 1209Hz, it may be determined that the frequency of the pulse code modulation audio data to be processed includes the dual tone multi-frequency signal corresponding to the key 1.
In order to further describe the filtering device for the dual-tone multi-frequency signal, please refer to fig. 2, fig. 2 is a schematic structural diagram of a filtering device for the dual-tone multi-frequency signal according to an embodiment of the present invention, which includes: a comparison module 201 and a filtration module 202;
the comparison module 201 is configured to obtain a frequency of the pulse code modulation audio data to be processed, compare the frequency of the pulse code modulation audio data to be processed with a preset dual-tone multi-frequency signal frequency, and generate a first comparison result;
the filtering module 202 is configured to, if it is determined according to the first comparison result that the frequency of the pulse code modulation audio data to be processed is consistent with the preset frequency of the dual-tone multi-frequency signal, determine that the frequency of the pulse code modulation audio data to be processed includes the dual-tone multi-frequency signal corresponding to a certain mobile phone key, and filter the pulse code modulation audio data to be processed.
In this embodiment, further comprising:
and if the frequency of the pulse code modulation audio data to be processed is judged to be inconsistent with the frequency of the preset dual-tone multi-frequency signal according to the first comparison result, the pulse code modulation audio data to be processed is sent to a call opposite terminal.
In this embodiment, the frequency of obtaining the pulse code modulated audio data to be processed is specifically:
receiving original pulse code modulated audio data from a wired network or a wireless network;
and carrying out sampling processing on the original pulse code modulation audio data according to a first sampling rate and combining a Goertzel algorithm to generate the pulse code modulation audio data to be processed, and obtaining the frequency of the pulse code modulation audio data to be processed.
In a specific embodiment, the filtering the pulse code modulated audio data to be processed specifically includes:
the original pulse code modulation audio data is sampled again according to a second sampling rate and combined with the Goertzel algorithm, and a first processing result is generated; wherein the second sampling rate is greater than the first sampling rate;
and calculating the precision of the first processing result, and setting the partial DTMF signal in the pulse code modulation audio data to be processed to be 0x00 when the precision of the first processing result meets a preset precision condition, so as to finish the filtering processing of the pulse code modulation audio data to be processed.
In a specific embodiment, when the accuracy of the first processing result meets the preset accuracy condition, the method further includes:
and when detecting that other common audios exist in the pulse code modulation audio data to be processed, storing the pulse code modulation audio data to be processed.
In a specific embodiment, the method further comprises:
when the precision of the first processing result does not meet the preset precision condition, the sampling rate is increased, the Goertzel algorithm is combined to conduct sampling processing on the original pulse code modulation audio data again, and a new processing result is generated until the precision of the new processing result meets the preset precision condition.
The embodiment of the invention obtains the frequency of the pulse code modulation audio data to be processed through a comparison module, compares the frequency of the pulse code modulation audio data to be processed with the frequency of a preset dual-tone multi-frequency signal, and generates a first comparison result; and if the filter module judges that the frequency of the pulse code modulation audio data to be processed is consistent with the frequency of the preset dual-tone multi-frequency signal according to the first comparison result, the filter module judges that the frequency of the pulse code modulation audio data to be processed comprises the dual-tone multi-frequency signal corresponding to a certain mobile phone key, and filters the pulse code modulation audio data to be processed.
According to the embodiment of the invention, whether the pulse code modulation audio data is the dual-tone multi-frequency signal corresponding to a certain mobile phone key is judged through software and filtered, so that the problem of call delay caused by identifying and filtering the dual-tone multi-frequency signal through a hardware interception device and a call evidence obtaining device can be avoided, and the real-time performance of a call is effectively improved while the dual-tone multi-frequency signal is prevented from being transmitted to a call opposite terminal. Meanwhile, on the premise of not needing recording operation, the embodiment of the invention compares the pulse code modulation audio data with the DTMF key signals after converting analog signals into Digital signals, thereby reducing hardware cost, avoiding hardware test and improving the recognition and filtering efficiency of DTMF.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (5)
1. A method for filtering a dual tone multi-frequency signal, comprising:
receiving original pulse code modulated audio data from a wired network or a wireless network; sampling the original pulse code modulation audio data according to a first sampling rate and combining a Goertzel algorithm to generate pulse code modulation audio data to be processed, and obtaining the frequency of the pulse code modulation audio data to be processed; comparing the frequency of the pulse code modulation audio data to be processed with the frequency of a preset dual-tone multi-frequency signal to generate a first comparison result;
if the frequency of the pulse code modulation audio data to be processed is judged to be consistent with the frequency of the preset dual-tone multi-frequency signal according to the first comparison result, judging that the frequency of the pulse code modulation audio data to be processed comprises a dual-tone multi-frequency signal corresponding to a certain mobile phone key; the original pulse code modulation audio data is sampled again according to a second sampling rate and combined with the Goertzel algorithm, and a first processing result is generated; wherein the second sampling rate is greater than the first sampling rate;
calculating the precision of the first processing result, and setting the partial DTMF signal in the pulse code modulation audio data to be processed to be 0x00 when the precision of the first processing result meets a preset precision condition, so as to finish the filtering processing of the pulse code modulation audio data to be processed; when the precision of the first processing result does not meet the preset precision condition, the sampling rate is increased, the Goertzel algorithm is combined to conduct sampling processing on the original pulse code modulation audio data again, and a new processing result is generated until the precision of the new processing result meets the preset precision condition.
2. The method of filtering a dual tone multi-frequency signal according to claim 1, further comprising:
and if the frequency of the pulse code modulation audio data to be processed is judged to be inconsistent with the frequency of the preset dual-tone multi-frequency signal according to the first comparison result, the pulse code modulation audio data to be processed is sent to a call opposite terminal.
3. The method according to claim 1, wherein when the accuracy of the first processing result meets the preset accuracy condition, further comprising:
and when detecting that other common audios exist in the pulse code modulation audio data to be processed, storing the pulse code modulation audio data to be processed.
4. A dual tone multi-frequency signal filtering apparatus, comprising: a comparison module and a filtering module;
the comparison module is used for receiving original pulse code modulation audio data from a wired network or a wireless network; sampling the original pulse code modulation audio data according to a first sampling rate and combining a Goertzel algorithm to generate pulse code modulation audio data to be processed, and obtaining the frequency of the pulse code modulation audio data to be processed; comparing the frequency of the pulse code modulation audio data to be processed with the frequency of a preset dual-tone multi-frequency signal to generate a first comparison result;
the filtering module is configured to determine that the frequency of the pulse code modulation audio data to be processed includes a dual-tone multi-frequency signal corresponding to a certain mobile phone key if it is determined that the frequency of the pulse code modulation audio data to be processed is consistent with the preset dual-tone multi-frequency signal according to the first comparison result; the original pulse code modulation audio data is sampled again according to a second sampling rate and combined with the Goertzel algorithm, and a first processing result is generated; wherein the second sampling rate is greater than the first sampling rate; calculating the precision of the first processing result, and setting the partial DTMF signal in the pulse code modulation audio data to be processed to be 0x00 when the precision of the first processing result meets a preset precision condition, so as to finish the filtering processing of the pulse code modulation audio data to be processed; when the precision of the first processing result does not meet the preset precision condition, the sampling rate is increased, the Goertzel algorithm is combined to conduct sampling processing on the original pulse code modulation audio data again, and a new processing result is generated until the precision of the new processing result meets the preset precision condition.
5. The apparatus for filtering a dual tone multi-frequency signal as claimed in claim 4, further comprising:
and if the frequency of the pulse code modulation audio data to be processed is judged to be inconsistent with the frequency of the preset dual-tone multi-frequency signal according to the first comparison result, the pulse code modulation audio data to be processed is sent to a call opposite terminal.
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| CN102457631A (en) * | 2010-10-21 | 2012-05-16 | 西安龙飞软件有限公司 | Method and device for eliminating in-band dual-tone multi-frequency of 3G (third generation) wireless router |
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