CN108134881B - Echo cancellation test tool, IP communication terminal echo cancellation automatic test system and test method thereof - Google Patents
Echo cancellation test tool, IP communication terminal echo cancellation automatic test system and test method thereof Download PDFInfo
- Publication number
- CN108134881B CN108134881B CN201810181053.6A CN201810181053A CN108134881B CN 108134881 B CN108134881 B CN 108134881B CN 201810181053 A CN201810181053 A CN 201810181053A CN 108134881 B CN108134881 B CN 108134881B
- Authority
- CN
- China
- Prior art keywords
- echo cancellation
- communication terminal
- digital signal
- original audio
- tested
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/2236—Quality of speech transmission monitoring
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
- G10L25/18—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being spectral information of each sub-band
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/78—Detection of presence or absence of voice signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/50—Testing arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
- H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Health & Medical Sciences (AREA)
- Acoustics & Sound (AREA)
- Computational Linguistics (AREA)
- Human Computer Interaction (AREA)
- Multimedia (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Abstract
The automatic test system for echo cancellation of the IP communication terminal is characterized by comprising a PC computer end, an echo cancellation test tool, an Ethernet switch and an IP communication terminal to be tested, wherein a CODEC chip and an MCU chip are arranged in the echo cancellation test tool, the PC computer end is connected with the echo cancellation test tool by using an earphone wire and performs transmission interaction of PCM audio data, the echo cancellation test tool is connected with the Ethernet switch by using an information socket connector and performs transmission interaction of information data, and the Ethernet switch is connected with the IP communication terminal to be tested by using the information socket connector and performs transmission interaction of information data. After the design is adopted, the invention can realize full-process automatic test without personnel participation in the test process, and once echo is captured, relevant personnel are informed in a mail mode, so that the input of test manpower resources is greatly saved and the test accuracy is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an echo cancellation testing tool, an automatic testing system for echo cancellation of an IP communication terminal, and a testing method thereof.
Background
In instant messaging applications, two parties or multiple parties need to communicate in real time, in places with higher requirements, an external sound box is usually adopted for playing, so that echo is necessarily generated, that is, after one party speaks, the sound box of the other party plays, and then the sound box of the other party plays sound and is collected by the Mic of the other party and is transmitted back to the user, but if the echo is not processed, the conversation quality and the user experience are affected, and vibration is more seriously generated, so that howling is generated. An echo cancellation technique is generated, and is one of typical applications of digital signal processing, but the echo cancellation technique is often theoretical reasoning first, so that in order to verify its actual effect, it is often required to verify through an echo cancellation test, and at present, two conventional methods of speaking at two ends by two persons are used in the test about echo cancellation, and the method needs two persons to participate in order to perform the method, which is not beneficial to performing a pressure test and counting the echo cancellation effect for a long time.
Disclosure of Invention
Based on the above reasons, the patent provides an echo cancellation test tool, an echo cancellation automatic test system of an IP communication terminal and a test method thereof, and by using the test tool and the test system, the automatic test can be realized, and the consumption of manpower is avoided.
The specific scheme is as follows: the echo cancellation test tool is characterized by comprising a CODEC chip and an MCU chip, wherein an earphone wire input module and an earphone wire output module are arranged on the CODEC chip; the MCU chip is provided with an information socket connection module, the MCU chip is connected with the CODEC chip, the echo cancellation test tool receives audio signals through the earphone wire input module, the earphone wire output module sends the audio signals, and the information socket connection module receives and sends information data.
Further, the echo cancellation test tool is characterized in that: the earphone wire input module and the earphone wire output module are a 3.5mm earphone wire input module and a 3.5mm earphone wire output module.
Further, the echo cancellation test tool is characterized in that: the information socket connection module is an RJ45 connection module.
The automatic test system for echo cancellation of the IP communication terminal manufactured by using the echo cancellation test tool is characterized by comprising a PC computer end, the echo cancellation test tool, an Ethernet switch and an IP communication terminal to be tested, wherein the PC computer end and the echo cancellation test tool are connected by using an earphone wire and mutually transmit audio data, the echo cancellation test tool is connected with the Ethernet switch by using an information socket connector and mutually transmit information data, and the Ethernet switch is connected with the IP communication terminal to be tested by using the information socket connector and mutually transmit information data.
Further, the earphone wire is a 3.5mm earphone wire
Further, the information socket connector is an RJ45 wire
The test method of the IP communication terminal echo cancellation automatic test system comprises the following steps:
step one, a PC computer end sends an original audio signal to a CODEC chip of an echo cancellation test tool through an earphone receiving wire, the CODEC chip carries out data coding on the original audio signal to obtain an original audio digital signal, and then the CODEC transmits the coded original audio digital signal to an MCU chip;
step two, the MCU chip sends the original audio digital signal obtained in the step one to an Ethernet switch through an information socket connector, and the Ethernet switch further sends the original audio digital signal to an IP communication terminal to be tested;
step three, the IP communication terminal to be tested processes the original audio digital signal and then sends the audio digital signal to be tested to an MCU chip built in the echo cancellation test tool through an Ethernet switch, and the MCU chip sends the audio digital signal to be tested to a CODEC chip for decoding to generate the audio signal to be tested;
step four, the MCU chip further transmits the audio signal to be detected obtained after the decoding processing in the step three to a PC computer end, the PC computer end respectively quantizes the frequency bands of the original audio signal and the audio signal to be detected by an FFT algorithm, the frequency bands are respectively divided into M frequency bands, and then the amplitude value of each frequency band is respectively calculated; multiplying each frequency band amplitude of the audio signal to be detected by a variable coefficient N, then comparing the frequency band amplitude with the amplitude of the original audio signal, sequentially increasing the value of the variable coefficient N from 0.1 to 10.0, respectively sequentially calculating and then comparing the frequency band amplitude with the amplitude of the original audio signal, when detecting that the variable coefficient N is within a certain value in a section, if the deviation between more than 70% of M frequency band amplitudes of the audio signal to be detected and the corresponding frequency band amplitude of the original audio signal is less than +/-10%, detecting echo, and sending a notification, and terminating the detection by a PC computer end; otherwise, it is regarded that no echo is detected.
Further, the test method of the automatic test system for echo cancellation of the IP communication terminal is characterized by comprising the following steps of: and M in the fourth step is 200-500.
Further, the test method of the automatic test system for echo cancellation of the IP communication terminal is characterized by comprising the following steps of: the coding method used by the CODEC chip in the first step is G711 algorithm, and PCM data coding is carried out on the original audio signal;
further, the test method of the automatic test system for echo cancellation of the IP communication terminal is characterized by comprising the following steps of: the decoding mode used by the CODEC chip in the third step is that the G711 algorithm decodes the audio digital signal to be detected, generates the PCM audio signal to be detected, and carries out noise reduction treatment;
after the design is adopted, the invention can realize full-process automatic test without personnel participation in the test process, and once echo is captured, relevant personnel are informed in a mail mode, so that the input of test manpower resources is greatly saved and the test accuracy is improved.
Drawings
FIG. 1 is a schematic diagram of the echo cancellation test tool
Fig. 2 is a schematic structural diagram of the automatic test system for echo cancellation of the IP communication terminal
Fig. 3 is a schematic diagram of the operation of the automated test system for echo cancellation of the IP communication terminal.
Detailed Description
As shown in fig. 1, an echo cancellation test tool 1 is characterized by comprising a CODEC chip 12 and an MCU chip 13, wherein the CODEC chip 12 is provided with a 3.5mm earphone line input module 121 and a 3.5mm earphone line output module 122; the MCU chip 13 is provided with an RJ45 connection module 131, the MCU chip 12 is connected with the CODEC chip 13, the echo cancellation test tool 1 receives audio signals through the 3.5mm earphone wire input module 121, the 3.5mm earphone wire output module 122 sends audio signals, and the RJ45 connection module 131 receives sending information data.
As shown in fig. 2, an automatic test system 2 for echo cancellation of an IP communication terminal is characterized by comprising a PC computer end 21, an echo cancellation test tool 1, an ethernet switch 22, and an IP communication terminal 23 to be tested, wherein the PC computer end 21 is connected with the echo cancellation test tool 1 by using a 3.5mm earphone line 211 and performs transmission interaction of PCM audio data, the echo cancellation test tool 1 is connected with the ethernet switch 22 by using an RJ45 line 221 and performs transmission interaction of information data, and the ethernet switch 22 is connected with the IP communication terminal 23 to be tested by using an RJ45 line 231 and performs transmission interaction of information data.
As shown in fig. 3, the test method of the automatic test system for echo cancellation of the IP communication terminal as described above comprises the following steps:
step one, a PC computer end sends an original audio signal to a CODEC chip of an echo cancellation test tool through an earphone receiving wire, the CODEC chip carries out data coding on the original audio signal to obtain an original audio digital signal, and then the CODEC transmits the coded original audio digital signal to an MCU chip;
step two, the MCU chip sends the original audio digital signal obtained in the step one to an Ethernet switch through an RJ45 wire, and the Ethernet switch further sends the original audio digital signal to an IP communication terminal to be tested;
step three, the IP communication terminal to be tested processes the original audio digital signal, then sends the audio digital signal to be tested to an MCU chip arranged in the echo cancellation test tool through an Ethernet switch, the MCU chip transmits the audio digital signal to be tested to a CODEC chip for decoding, and the CODEC chip decodes the audio digital signal to be tested by using a G711 algorithm to generate a PCM audio signal to be tested and performs noise reduction treatment;
step four, the MCU chip further transmits the audio signal to be detected obtained after the decoding processing in the step three to a PC computer end, the PC computer end respectively quantizes the frequency bands of the original audio signal and the audio signal to be detected by an FFT algorithm, respectively divides the frequency bands into 256 frequency bands, and then respectively calculates the amplitude value of each frequency band; multiplying each frequency band amplitude of the audio signal to be tested by a variable coefficient N, comparing the variable coefficient N with the amplitude of the original audio signal, sequentially increasing the value of the variable coefficient N from 0.1 to 10.0, respectively and sequentially calculating and then comparing the variable coefficient N with the amplitude of the original audio signal, when detecting that the variable coefficient N is a certain value in a section, if the deviation between 180 frequency band amplitudes of M frequency band amplitudes of the audio signal to be tested and the corresponding frequency band amplitude of the original audio signal is less than +/-10%, the echo is detected, and notifying related personnel of the abnormality captured in the test in a mail mode, and the PC computer end terminates the test; otherwise, it is regarded that no echo is detected.
Claims (9)
1. The tool for testing the echo cancellation effect is characterized by comprising a CODEC chip and an MCU chip, wherein an earphone wire input module and an earphone wire output module are arranged on the CODEC chip; an information socket connection module is arranged on the MCU chip, and the MCU chip is connected with the CODEC chip; the CODEC chip receives the original audio digital signal through the earphone wire input module, performs data encoding on the original audio signal, and then transmits the encoded original audio digital signal to the MCU chip; the MCU chip sends the obtained coded original audio digital signal to an Ethernet switch through an information socket connection module, and the Ethernet switch further sends the obtained coded original audio digital signal to an IP communication terminal to be tested; the IP communication terminal to be tested receives the coded original audio digital signal, processes the coded original audio digital signal, then sends the audio digital signal to be tested to an MCU chip arranged in the echo cancellation effect testing tool through the Ethernet switch, and the MCU chip sends the audio digital signal to be tested to a CODEC chip for decoding to generate the audio signal to be tested, and further sends the audio signal to a PC (personal computer) end through the MCU chip; the echo cancellation effect testing tool receives audio signals through the earphone wire input module, the earphone wire output module sends the audio signals, and the information socket connection module receives and sends information data.
2. The test tool for echo cancellation effect of claim 1, wherein: the earphone wire input module and the earphone wire output module are a 3.5mm earphone wire input module and a 3.5mm earphone wire output module.
3. The test tool for echo cancellation effect of claim 1, wherein: the information socket connection module is an RJ45 connection module.
4. An automatic test system for echo cancellation effect of IP communication terminal made by using the test tool for echo cancellation effect of any one of claims 1-3, which is characterized by comprising a PC computer end, an echo cancellation effect test tool, an ethernet switch, and an IP communication terminal to be tested, wherein the PC computer end and the echo cancellation effect test tool are connected by earphone wires and perform mutual transmission of audio data, the echo cancellation effect test tool and the ethernet switch are connected by an information socket connector and perform mutual transmission of information data, and the ethernet switch and the IP communication terminal to be tested are connected by an information socket connector and perform mutual transmission of information data.
5. An automated test system for echo cancellation effects in an IP communication terminal made by an echo cancellation effect testing tool as claimed in claim 4, wherein: the earphone wire is a 3.5mm earphone wire.
6. An automated test system for echo cancellation effects in an IP communication terminal made by an echo cancellation effect testing tool as claimed in claim 4, wherein: the information socket connector is an RJ45 wire.
7. The method for testing an echo cancellation effect automatic testing system of an IP communication terminal according to any one of claims 4-6, wherein:
step one, a PC computer end sends an original audio signal to a CODEC chip of an echo cancellation effect testing tool through an earphone receiving wire, the CODEC chip carries out data coding on the original audio signal to obtain an original audio digital signal, and then the CODEC transmits the coded original audio digital signal to an MCU chip;
step two, the MCU chip sends the original audio digital signal obtained in the step one to an Ethernet switch through an information socket connector, and the Ethernet switch further sends the original audio digital signal to an IP communication terminal to be tested;
step three, the IP communication terminal to be tested processes the original audio digital signal and then sends the audio digital signal to be tested to an MCU chip built in the echo cancellation effect testing tool through an Ethernet switch, and the MCU chip sends the audio digital signal to be tested to a CODEC chip for decoding to generate the audio signal to be tested;
step four, the MCU chip further transmits the audio signal to be detected obtained after the decoding processing in the step three to a PC computer end, the PC computer end respectively quantizes the frequency bands of the original audio signal and the audio signal to be detected by an FFT algorithm, the frequency bands are respectively divided into M frequency bands, then the amplitude value of each frequency band is respectively calculated, and the M value is 200-500; multiplying each frequency band amplitude of the audio signal to be detected by a variable coefficient N, then comparing the variable coefficient N with the amplitude of the original audio signal, sequentially increasing the value of the variable coefficient N from 0.1 to 10.0, respectively sequentially calculating and then comparing the variable coefficient N with the amplitude of the original audio signal, when detecting that the variable coefficient N is within a certain value in a section, if the deviation between the frequency band amplitude exceeding 70% in M frequency band amplitudes of the audio signal to be detected and the corresponding frequency band amplitude of the original audio signal is less than +/-10%, the echo is detected, the echo is not consistent with the preset, notification is sent, and the PC end terminates the detection; otherwise, it is regarded that no echo is detected, meaning that the echo cancellation effect meets the preset.
8. The method for testing an echo cancellation effect automatic test system of an IP communication terminal according to claim 7, wherein: the coding method used by the CODEC chip in the first step is G711 algorithm, and the PCM data coding is carried out on the original audio signal.
9. The method for testing an echo cancellation effect automatic test system of an IP communication terminal according to claim 7, wherein: and step three, the decoding mode used by the CODEC chip is that the G711 algorithm decodes the audio digital signal to be detected, generates the PCM audio signal to be detected and performs noise reduction treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810181053.6A CN108134881B (en) | 2018-03-06 | 2018-03-06 | Echo cancellation test tool, IP communication terminal echo cancellation automatic test system and test method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810181053.6A CN108134881B (en) | 2018-03-06 | 2018-03-06 | Echo cancellation test tool, IP communication terminal echo cancellation automatic test system and test method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108134881A CN108134881A (en) | 2018-06-08 |
| CN108134881B true CN108134881B (en) | 2023-07-25 |
Family
ID=62431329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810181053.6A Active CN108134881B (en) | 2018-03-06 | 2018-03-06 | Echo cancellation test tool, IP communication terminal echo cancellation automatic test system and test method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108134881B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110933240B (en) * | 2019-10-16 | 2021-03-16 | 福建星网智慧软件有限公司 | Voice frequency automatic testing device and method of VoIP terminal |
| CN111741168B (en) * | 2020-08-07 | 2022-02-18 | 睿云联(厦门)网络通讯技术有限公司 | Communication equipment testing method and device, computer readable medium and equipment thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101313483A (en) * | 2005-11-17 | 2008-11-26 | 微软公司 | Configuration of echo cancellation |
| CN201444653U (en) * | 2009-06-23 | 2010-04-28 | 青岛海信移动通信技术股份有限公司 | Audio system capable of suppressing echoes and mobile communication device with same |
| CN202713549U (en) * | 2012-08-15 | 2013-01-30 | 天津同德龙科技有限公司 | Noise and echo eliminating circuit of network broadcast talkback communication station |
| CA2788916A1 (en) * | 2011-09-09 | 2013-03-09 | Qnx Software Systems Limited | Echo cancelling codec |
| CN103152500A (en) * | 2013-02-21 | 2013-06-12 | 中国对外翻译出版有限公司 | Method for eliminating echo from multi-party call |
| CN103366757A (en) * | 2012-04-09 | 2013-10-23 | 广达电脑股份有限公司 | Communication system and method with echo cancellation mechanism |
| CN104954942A (en) * | 2015-06-10 | 2015-09-30 | 百度在线网络技术（北京）有限公司 | Signal input device and method for echo cancellation |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130066638A1 (en) * | 2011-09-09 | 2013-03-14 | Qnx Software Systems Limited | Echo Cancelling-Codec |
| KR20140029931A (en) * | 2012-08-31 | 2014-03-11 | 삼성전자주식회사 | Apparatas and method for intercepting echo occurrence to extinct voice of outputting speaker in an electronic device |
-
2018
- 2018-03-06 CN CN201810181053.6A patent/CN108134881B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101313483A (en) * | 2005-11-17 | 2008-11-26 | 微软公司 | Configuration of echo cancellation |
| CN201444653U (en) * | 2009-06-23 | 2010-04-28 | 青岛海信移动通信技术股份有限公司 | Audio system capable of suppressing echoes and mobile communication device with same |
| CA2788916A1 (en) * | 2011-09-09 | 2013-03-09 | Qnx Software Systems Limited | Echo cancelling codec |
| CN103366757A (en) * | 2012-04-09 | 2013-10-23 | 广达电脑股份有限公司 | Communication system and method with echo cancellation mechanism |
| CN202713549U (en) * | 2012-08-15 | 2013-01-30 | 天津同德龙科技有限公司 | Noise and echo eliminating circuit of network broadcast talkback communication station |
| CN103152500A (en) * | 2013-02-21 | 2013-06-12 | 中国对外翻译出版有限公司 | Method for eliminating echo from multi-party call |
| CN104954942A (en) * | 2015-06-10 | 2015-09-30 | 百度在线网络技术（北京）有限公司 | Signal input device and method for echo cancellation |
Non-Patent Citations (2)
| Title |
|---|
| 一种回声消除和噪声抑制SoC芯片;叶波;李天望;罗敏;;电子学报(第08期);第159-163页 * |
| 刘坛春 ; .基于CX20707 SPoC在安防楼宇对讲中的回声消除设计.电子设计工程.2011,第106-108页，第111页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108134881A (en) | 2018-06-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101120510B (en) | Wireless microphone system | |
| CN108134881B (en) | Echo cancellation test tool, IP communication terminal echo cancellation automatic test system and test method thereof | |
| US9917945B2 (en) | In-service monitoring of voice quality in teleconferencing | |
| CN103312419A (en) | Method and system for data communication based on audio or ultrasonic | |
| CN103348700B (en) | The system and method eliminated for the acoustic echo of wireless microphone and loudspeaker | |
| CN105304079A (en) | Multi-party call multi-mode speech synthesis method and system | |
| CN102263576B (en) | Wireless information transmitting method and method realizing device | |
| CN103988486A (en) | Method to Select Active Channels in Audio Mixing for Multi-Party Teleconferencing | |
| CN103957220A (en) | Data transmission method and system based on frequency conversion sound waves | |
| CN110545124B (en) | False-proof hidden communication structure and method based on cricket cry | |
| EP2247082A1 (en) | Telecommunication device, telecommunication system and method for telecommunicating voice signals | |
| CN109741757B (en) | Real-time voice compression and decompression method for narrow-band Internet of things | |
| CN208063296U (en) | System is tested in a kind of echo cancellation testing tool and IP communicating terminal echo cancellation | |
| CN105915293A (en) | Voice digital information transmission system and method based on wireless acoustic signals | |
| CN202996288U (en) | Digital voice bi-directional processing device | |
| CN109003620A (en) | A kind of echo removing method, device, electronic equipment and storage medium | |
| CN109775500B (en) | Elevator five-party communication system | |
| CN104954079A (en) | Method and system for coding and decoding in sound wave communication | |
| CN101930745B (en) | Method and equipment for eliminating echoes during IP voice communication | |
| CN105472190A (en) | Audio signal time delay testing method | |
| CN204231472U (en) | A kind of intelligent meeting telephone set with feature identification | |
| CN104301561A (en) | Intelligent conference telephone set | |
| US11837241B2 (en) | Encoding and decoding method, decoding method, apparatuses therefor and program | |
| CN109874083A (en) | A kind of news sound pick-up outfit with monitoring device | |
| US11973900B2 (en) | Multipoint control method, apparatus and program |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |