CN101504460A - Method and apparatus for measuring distance between user and cam on video telephone - Google Patents
Method and apparatus for measuring distance between user and cam on video telephone Download PDFInfo
- Publication number
- CN101504460A CN101504460A CNA2009100086923A CN200910008692A CN101504460A CN 101504460 A CN101504460 A CN 101504460A CN A2009100086923 A CNA2009100086923 A CN A2009100086923A CN 200910008692 A CN200910008692 A CN 200910008692A CN 101504460 A CN101504460 A CN 101504460A
- Authority
- CN
- China
- Prior art keywords
- videophone
- time
- user
- distance
- mike
- 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.)
- Pending
Links
Images
Landscapes
- Telephone Function (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The embodiment of the invention discloses a method and a device for measuring the distance between a user and a camera on a video telephone when the user uses a handle microphone for communication with the video telephone. The method comprises the following steps: triggering a hands-free microphone of the video telephone to start voice gathering; acquiring a first time when the handle microphone of the video telephone gathers a voice and acquiring a second time when the hands-free microphone of the video telephone gathers a voice; and calculating the distance between the user and the camera of the video telephone according to the second time and the first time. The method and the device require no extra hardware equipment, prompt the user of the distance from the camera of the video telephone during the use of the video telephone while fulfilling the aim of measurement, and reduce the manufacturing cost of the video telephone while improving the speech quality in the video communication between video telephone users.
Description
Technical field
The present invention relates to field of video communication, relate in particular to a kind of method and device of on videophone, measuring user and camera distance.
Background technology
Visual telephone service is a kind of video communication service of point-to-point, it can utilize the image and the voice signal of the two-way real-time Transmission both call sides of telephone network, it is the video meeting system in a kind of extensive application field, utilize videophone to carry out between the user of communication, can when conversation, see the other side's image.Popularization along with visual telephone service; the user of videophone is more and more, but some user is when carrying out the videophone communication, crosses closely apart from local camera or far away excessively through regular meeting; the image effect that causes the other side to see is bad, not fogging result such as clear.
In practice, can be by calculating the method for the distance between user and the camera, in order to inform that user distance is crossed far or near excessively, select suitable distance to remind the user, strengthen image effect.In the prior art, a kind of infrared transmitter that passes through on videophone is arranged, method according to reflection of light principle test subscriber and camera distance, its implementation procedure is as follows: an infrared launcher is installed near local camera, when beginning to converse, the user starts infrared transmitter emission infrared ray, when infrared ray detects the signal of people's face and produces the infrared external reflection signal, after receiving the infrared external reflection signal, infrared receiving device calculates the distance between user and the camera, this distance is actually the distance between infrared receiving device and the user, because of infrared receiving device is installed near the camera, so this distance also can be thought the distance between user and the camera.
From said process as can be seen, utilize infrared launcher can test out distance between user and the camera, but the cost of infrared equipment is comparatively expensive in practice, in view of videophone requirement cheaply, utilize the method for infrared launcher measuring distance will certainly increase the cost of manufacture of videophone greatly, will make the universal comparatively difficulty that becomes of videophone.
Summary of the invention
The embodiment of the invention provides a kind of method and device of measuring user and camera distance on videophone, to solve the bigger problem of cost of utilizing the infrared launcher measuring distance to cause in the prior art.
For solving the problems of the technologies described above, the embodiment of the invention provides a kind of method of measuring user and camera distance on videophone, comprising:
The hands-free Mike who triggers videophone begins to gather voice;
The handle Mike who obtains described videophone collects the very first time of voice, and the hands-free Mike who obtains described videophone collects second time of voice;
According to described second time and the very first time, calculate the distance between the camera of described user and described videophone.
The embodiment of the invention also provides a kind of device of measuring user and camera distance on videophone, comprising:
Trigger module, the hands-free Mike who is used to trigger videophone begins to gather voice;
First acquisition module, the handle Mike who is used to obtain described videophone collects the very first time of voice;
Second acquisition module, the hands-free Mike who is used to obtain described videophone collects second time of voice;
Computing module was used for according to described second time and the very first time, calculated the distance between the camera of described user and described videophone.
The embodiment of the invention has the following advantages:
In embodiments of the present invention, when the user adopts handle Mike to carry out the conversation of videophone, can trigger hands-free Mike simultaneously and begin to gather voice, and the handle Mike who obtains described videophone collects the very first time of voice, collect second time of voice with hands-free Mike, and by calculating the mistiming of speech trigger between hands-free Mike and the handle Mike, calculate the distance between the camera of user and videophone, with infrared transmitter is set in the prior art measures the method for the distance between people's face and the camera and compare, the embodiment of the invention need not to be provided with extra hardware device, when finishing the measurement purpose, can point out the user in use apart from the distance of videophone camera, when between raising videophone user, carrying out the speech quality of video communication, reduced the cost of manufacture of videophone.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a process flow diagram of measuring the method embodiment one of user and camera distance on videophone of the present invention;
Fig. 2 is a process flow diagram of measuring the method embodiment two of user and camera distance on videophone of the present invention;
Fig. 3 is a process flow diagram of measuring the method embodiment three of user and camera distance on videophone of the present invention;
Fig. 4 is a structural representation of measuring the device embodiment one of user and camera distance on videophone of the present invention;
Fig. 5 is a structural representation of measuring the device embodiment two of user and camera distance on videophone of the present invention;
Fig. 6 is a structural representation of measuring the device embodiment three of user and camera distance on videophone of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
For above-mentioned purpose, the feature and advantage that make the embodiment of the invention can become apparent more, the embodiment of the invention is described in further detail below in conjunction with the drawings and specific embodiments.
With reference to figure 1, in the embodiment of the invention one, when the user adopts handle Mike to carry out the videophone communication, realize that the method that the embodiment of the invention one is provided can may further comprise the steps:
Step 101: the hands-free Mike who triggers videophone begins to gather voice;
In practice, when the user adopts handle Mike to carry out the videophone communication, can open handle Mike and hands-free Mike's audio collection interface by primary processor simultaneously according to signal condition, when handle Mike is picked up, it is not on the throne that the slotting spring of handle detects handle, report upper level applications by driver module, the register that application program is provided with audio decoder (codec chip) by the driver module interface interchange is again opened the acquisition state of audio process chip, realizes the purpose that hands-free Mike and handle Mike gather voice simultaneously;
Wherein, the specific implementation that register is set can be upper level applications, can realize switch control hands-free and that handle is gathered by calling hands-free control register and the handle control register that driving interface be provided with audio decoder.The register of controlling hands-free Mike is register1, joystick Mike's register is register2, and in practice, the value of register is to represent in 1 o'clock to open to gather, be that 0 o'clock sign is closed collection, then the value of register1 and register2 can be set to 1 simultaneously in the present embodiment;
Step 102: the handle Mike who obtains described videophone collects the very first time of voice;
In actual applications, the described very first time promptly is the current system time that user's voice arrives handle Mike;
Step 103: the hands-free Mike who obtains described videophone collects second time of voice;
In actual applications, described second time promptly is the current system time that user's voice arrives hands-free Mike;
Step 104:, calculate the distance between the camera of described user and described videophone according to described second time and the very first time.
Numerical value according to the described very first time and second time, can calculate the distance between handle Mike and the hands-free Mike, because when the user adopts handle Mike to converse, distance between user and the camera be similar to basically handle Mike and and hands-free Mike's distance, therefore, the result who calculates is the distance between the camera of described user and described videophone.
In the embodiment of the invention one, described primary processor is specifically as follows the Hi3510 chip, as can be seen, when the user adopts handle Mike to carry out the conversation of videophone, trigger hands-free Mike simultaneously and gather voice, by calculating the mistiming of speech trigger between hands-free Mike and the handle Mike, calculate the distance between the camera of user and videophone, with infrared transmitter is set in the prior art measures the method for the distance between people's face and the camera and compare, the embodiment of the invention need not to be provided with extra hardware device, when finishing the measurement purpose, further the prompting user is in use apart from the distance of videophone camera, when between raising videophone user, carrying out the speech quality of video communication, reduced the cost of manufacture of videophone.
With reference to figure 2, in the embodiment of the invention two, when the user adopts handle Mike to converse, realize that the method that the embodiment of the invention two is provided can may further comprise the steps:
Step 201: the hands-free Mike who triggers videophone begins to gather voice;
Step 202: whether the level value of judging first digital signal surpasses first threshold, and the digital signal that the speech data that described first digital signal collects for handle Mike is converted to through analog digital is if then enter step 203;
In practice, because when the user adopts handle Mike to converse in videophone, sound can at first arrive handle Mike, and this sound signal is adopted the sampling rate collection of 8K and carried out the analog digital conversion by audio decoder, is become the code stream of two-way PCM by analog signal conversion; In videophone, there is digital audio interface between primary processor and the audio decoder, the digital signal of the code stream of the two-way PCM after hands-free Mike and handle Mike's the two-way conversion is converged at this digital audio interface, the demultiplexing of process primary processor is this two ways of digital signals, extract respectively, can obtain first digital signal wherein; Primary processor can be judged two-way PCM data then, described judgement specifically can be several sampled points of gathering the PCM data conversion, test its level value and whether surpass first threshold, if surpass, then think this moment handle Mike voice begin triggering; The number of described sampled point can be 3, and described first threshold can be 3DB, and the present invention does not do qualification to this;
Step 203: the current time that described first digital signal surpasses first threshold is set to the very first time;
When the judged result of step 202 for being, promptly be described first numerical information when surpassing first threshold, then obtain current system time, and be the very first time current system time setting;
Step 204: whether the level value of judging second digital signal surpasses second threshold value, and described second digital signal is that the speech data that hands-free Mike collects passes through the digital signal that analog digital is converted to, if then enter step 205;
Primary processor can adopt the same procedure in the step 202 to judge whether the level value of second digital signal surpasses second threshold value simultaneously, need to prove, described first threshold and second threshold value can be identical also can be inequality, when gathering hands-free Mike's the level value of digital signal, can with step 202 in gather the sampled point of as much, also can be inequality, the present invention does not do qualification;
Step 205: the current time that described second digital signal surpasses second threshold value was set to for second time;
When the judged result of described step 204 for being, promptly be described second digital signal when surpassing second threshold value, then obtain current system time, be second time with this current system time setting;
Step 206: the mistiming of obtaining described second time and the very first time;
Step 207: calculate the product of the described mistiming and the velocity of sound, then described product can be thought the user of described videophone and the distance between the camera.
In this step, the sound that calculates the described mistiming and promptly be the user arrives handle Mike and hands-free Mike's mistiming respectively, therefore, the described mistiming be multiply by velocity of sound constant, can obtain the distance between handle Mike and the hands-free Mike, when the user adopted handle Mike to converse, product also can be thought the use user of described videophone and the distance between the camera.
In the present embodiment, specifically can whether look into the mode of a certain threshold value through the sampled level value of the digital signal after changing by judging voice signal, can obtain the mistiming of voice signal when arriving handle Mike and hands-free Mike, and, both are multiplied each other obtain distance between hands-free Mike and the handle Mike according to sound velocity of propagation in air.
With reference to figure 3, in the embodiment of the invention three, when the user adopts handle Mike to carry out the videophone communication, realize that the method that the embodiment of the invention three is provided can may further comprise the steps:
Step 301: the hands-free Mike who triggers videophone begins to gather voice;
Step 302: the handle Mike who obtains described videophone collects the very first time of voice;
Step 303: the hands-free Mike who obtains described videophone collects second time of voice;
Step 304: the mistiming of obtaining described second time and the very first time;
Step 305: the product that calculates the described mistiming and the velocity of sound.
In actual applications, because the camera of videophone all has pixel request, therefore, cross far away or cross when near when the user distance camera, all can make image quality decrease, therefore, when the approximate distance between user who calculates and the camera is crossed far or be near excessively, may further include:
Step 306: when in the numerical value interval that the size of described distance is not presetting, the prompting user distance is improper.
In the present embodiment, suppose that sample frequency is 8K, time precision 1/8000=0.000125 second of sampling rate restriction then, then range accuracy is the velocity of sound 340 meter per seconds * 0.000125=0.0425 rice, can be central point then with 0.0425, described numerical value interval of presetting can be set to [0.0420,0.0430], wherein, being provided with of numerical value interval can independently be set according to actual conditions and demand by the user, the present invention's contrast does not limit, and when the distance that calculates exceeds this numerical value interval, can point out user distance improper on display screen.Perhaps, also can with 0.0425 meter be gauged distance, the distance that the prompting user should be in handle Mike and hands-free Mike is to converse in 0.425 place.
In concrete realization; can adopt multiple mode to finish this function of prompting; can represent that the distance of user and videophone is improper by on the display screen of videophone, demonstrating certain bell character; can also adopt the alarm sound or the music that pre-set to come the improper of tip distance; can also adopt in the display screen that the other side's image local terminal shows and adopt picture-in-picture (PIP; Picture InPicture) mode realizes; certainly the mode that also has other; to this; embodiments of the invention are not done qualification, and the implementation of other prompting is also within protection scope of the present invention.
As can be seen, the present invention not only can be in the distance that calculates user and videophone, reduce the cost of manufacture of videophone, can also improve the speech quality of carrying out video communication between the videophone user by the distance of interface display with the prompting user distance.
Need to prove, in the implementation procedure of the embodiment of the invention, can also utilize the propagation distance of sound in unlatching just more little principle far away more, by gather handle Mike when the speech trigger first volume and the size of second volume of hands-free Mike during in speech trigger come computed range.In this implementation, can be the first volume V1 in the voice signal maximum level value that handle Mike end collects by primary processor, holding the maximum level value of the voice signal that collects hands-free Mike is the second volume V2, then can utilize formula distance L=K*V1/V2 to calculate, described K is a distance coefficient, can measure according to hands-free Mike and handle Mike's enlargement factor.
Need to prove, for aforesaid each method embodiment, for simple description, so it all is expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not subjected to the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in the instructions all belongs to preferred embodiment, and related action and module might not be that the present invention is necessary.
Corresponding with the method that the invention described above embodiment is provided, referring to Fig. 4, the embodiment of the invention also provide a kind of on videophone the device of test subscriber and camera distance, described device specifically can comprise:
In the present embodiment, utilize far and near different its time of arrival of the also different principle of the aerial propagation distance of sound, can be by computing module according to described second time and the very first time, distance between the camera of calculating user and videophone, the described device of present embodiment can be integrated on the videophone, with infrared transmitter is set in the prior art measures the method for the distance between people's face and the camera and compare, the embodiment of the invention need not to be provided with extra hardware device, when finishing the measurement purpose, can point out the user in use apart from the distance of videophone camera, improve when carrying out the speech quality of video communication between the videophone user, reduced the cost of manufacture of videophone.
Corresponding with the inventive method embodiment two, with reference to shown in Figure 5, show the structural representation of apparatus of the present invention embodiment two, this device specifically can comprise:
First judges submodule 502, is used to judge whether the level value of first digital signal surpasses first threshold, the digital signal that the speech data that described first digital signal collects for handle Mike is converted to through analog digital;
First is provided with submodule 503, be used for when described first result who judges submodule when being, described first digital signal is set to the very first time above the current time of first threshold;
Second judges submodule 504, is used to judge whether the level value of second digital signal surpasses second threshold value, and described second digital signal is that the speech data that hands-free Mike collects passes through the digital signal that analog digital is converted to;
Second is provided with submodule 505, be used for when described second result who judges submodule when being, described second digital signal was set to for second time above the current time of second threshold value;
Obtain submodule 506, be used to obtain the mistiming of described second time and the very first time;
Calculating sub module 507 is used to calculate the product of the described mistiming and the velocity of sound.
In the present embodiment, specifically can whether look into the mode of a certain threshold value through the sampled level value of the digital signal after changing by judging voice signal, can obtain the very first time and second time of voice signal when arriving handle Mike and hands-free Mike by first acquisition module and second acquisition module, and, by calculating sub module both are multiplied each other and to obtain distance between hands-free Mike and the handle Mike according to sound velocity of propagation in air.
Corresponding with the inventive method embodiment three, with reference to shown in Figure 6, show the structural representation of apparatus of the present invention embodiment three, as shown in the figure, this device can comprise:
Trigger module 601, the hands-free Mike who is used to trigger videophone begins to gather voice;
First acquisition module 602, the handle Mike who is used to obtain described videophone collects the very first time of voice;
Second acquisition module 603, the hands-free Mike who is used to obtain described videophone collects second time of voice;
Computing module 604 is used for according to described second time and the very first time distance between the camera of calculating user and videophone.
Reminding module 605 is used for showing to the user with the form at interface the size of the distance between the camera of described user and described videophone.
The embodiment of the invention not only can be in the distance that calculates user and videophone, reduce the cost of manufacture of videophone, can also be by the distance of interface display, to improve the speech quality of carrying out video communication between the videophone user by described reminding module 605 prompting user distance.
In concrete realization; can adopt multiple mode to finish this function of prompting; can represent that the distance of user and videophone is improper by on the display screen of videophone, demonstrating certain bell character; can also adopt the alarm sound or the music that pre-set to come the improper of tip distance; can also adopt in the display screen that the other side's image local terminal shows and adopt picture-in-picture (PIP; Picture InPicture) mode realizes; certainly the mode that also has other; to this; embodiments of the invention are not done qualification, and the implementation of other prompting is also within protection scope of the present invention.
Need to prove, because aforementioned very detailed that the method for test subscriber and camera distance is introduced on videophone, so described on videophone the not detailed part of device embodiment of test subscriber and camera distance, can no longer device be described in detail at this referring to the description of aforementioned method embodiment to test subscriber on videophone and camera distance.
By the description of above embodiment, those skilled in the art can be well understood to and need to prove, the embodiment of the invention does not need to introduce independently functional part, can realize by the mode that software adds essential general hardware platform.Based on such understanding, the part that the technical scheme of the embodiment of the invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprises that some instructions are in order to carry out the described method of each embodiment of the present invention.Here alleged storage medium, as: ROM/RAM, disk, CD etc.
Need to prove, in this article, relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint and have the relation of any this reality or in proper order between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Do not having under the situation of more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
More than a kind of method and device of measuring user and camera distance on videophone was described in detail to the embodiment of the invention provides, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used to help to understand the method and the thought thereof of the embodiment of the invention; Simultaneously, for one of ordinary skill in the art, according to the thought of the embodiment of the invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1, a kind of method of measuring user and camera distance on videophone when the user adopts handle Mike to carry out the videophone communication, is characterized in that, comprising:
The hands-free Mike who triggers videophone begins to gather voice;
The handle Mike who obtains described videophone collects the very first time of voice, and the hands-free Mike who obtains described videophone collects second time of voice;
According to described second time and the very first time, calculate the distance between the camera of described user and described videophone.
2, method according to claim 1 is characterized in that, the described handle Mike who obtains described videophone collects the very first time of voice, specifically comprises:
Whether the level value of judging first digital signal surpasses first threshold, described first digital signal is that the speech data that described handle Mike collects passes through the digital signal that analog digital is converted to, if the current time that then described first digital signal surpasses first threshold is set to the very first time.
3, method according to claim 1 is characterized in that, second time of the described hands-free Mike's who obtains described videophone speech trigger, specifically comprises:
Whether the level value of judging second digital signal surpasses second threshold value, described second digital signal is that the speech data that described hands-free Mike collects passes through the digital signal that analog digital is converted to, if the current time that then described second digital signal surpasses second threshold value was set to for second time.
4, method according to claim 1 is characterized in that, described second time of described foundation and the very first time, calculate the distance between the camera of described user and described videophone, and specifically comprise:
Obtain the mistiming of described second time and the very first time;
The product that calculates the described mistiming and the velocity of sound obtains the distance between the camera of described user and described videophone.
5, according to the method described in the arbitrary claim of claim 1-4, it is characterized in that, after the distance between the camera of described user of described calculating and described videophone, also comprise:
When in the numerical value interval that the size of described distance is not presetting, the prompting user distance is improper.
6, a kind of device of measuring user and camera distance on videophone is characterized in that, comprising:
Trigger module, the hands-free Mike who is used to trigger videophone begins to gather voice;
First acquisition module, the handle Mike who is used to obtain described videophone collects the very first time of voice;
Second acquisition module, the hands-free Mike who is used to obtain described videophone collects second time of voice;
Computing module was used for according to described second time and the very first time, calculated the distance between the camera of described user and described videophone.
7, device according to claim 6 is characterized in that, described first acquisition module comprises:
First judges submodule, is used to judge whether the level value of first digital signal surpasses first threshold, the digital signal that the speech data that described first digital signal collects for handle Mike is converted to through analog digital;
First is provided with submodule, be used for when described first result who judges submodule when being, described first digital signal is set to the very first time above the current time of first threshold.
8, device according to claim 6 is characterized in that, described second acquisition module comprises:
Second judges submodule, is used to judge whether the level value of second digital signal surpasses second threshold value, and described second digital signal is that the speech data that hands-free Mike collects passes through the digital signal that analog digital is converted to;
Second is provided with submodule, be used for when described second result who judges submodule when being, described second digital signal was set to for second time above the current time of second threshold value.
9, device according to claim 6 is characterized in that, described computing module comprises:
Obtain submodule, be used to obtain the mistiming of described second time and the very first time;
Calculating sub module, the product that is used to calculate the described mistiming and the velocity of sound obtain the distance between the camera of described user and described videophone.
10, according to the device described in the arbitrary claim of claim 6-9, it is characterized in that described device also comprises:
Reminding module is used for showing to the user with multimedia form the size of the distance between the camera of described user and described videophone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100086923A CN101504460A (en) | 2009-02-11 | 2009-02-11 | Method and apparatus for measuring distance between user and cam on video telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100086923A CN101504460A (en) | 2009-02-11 | 2009-02-11 | Method and apparatus for measuring distance between user and cam on video telephone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101504460A true CN101504460A (en) | 2009-08-12 |
Family
ID=40976758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100086923A Pending CN101504460A (en) | 2009-02-11 | 2009-02-11 | Method and apparatus for measuring distance between user and cam on video telephone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101504460A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185954A (en) * | 2011-04-29 | 2011-09-14 | 信源通科技（深圳）有限公司 | Method for regulating audio frequency in video call and terminal equipment |
| CN104155644A (en) * | 2014-08-20 | 2014-11-19 | 西安电子科技大学 | Ranging method based on sound sensor and system thereof |
| CN105403880A (en) * | 2014-08-29 | 2016-03-16 | 展讯通信（上海）有限公司 | System and method for measuring distance |
-
2009
- 2009-02-11 CN CNA2009100086923A patent/CN101504460A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185954A (en) * | 2011-04-29 | 2011-09-14 | 信源通科技（深圳）有限公司 | Method for regulating audio frequency in video call and terminal equipment |
| CN104155644A (en) * | 2014-08-20 | 2014-11-19 | 西安电子科技大学 | Ranging method based on sound sensor and system thereof |
| CN105403880A (en) * | 2014-08-29 | 2016-03-16 | 展讯通信（上海）有限公司 | System and method for measuring distance |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101884709B1 (en) | Method and apparatus for adjusting volume of user terminal, and terminal | |
| RU2619893C2 (en) | Method and device for voice call, method and device for voice signal reproducing | |
| ATE207275T1 (en) | METHOD AND DEVICE FOR AUDIOVISUAL TELECOMMUNICATIONS OVER A DIGITAL NETWORK | |
| CN107978316A (en) | The method and device of control terminal | |
| US20060293888A1 (en) | Providing text during a live voice conversation over a telephone network | |
| CN102833428A (en) | Method for displaying menu options in automatic voice service, and communication terminal | |
| CN102685305A (en) | Contextual mode switching method of mobile terminal and mobile terminal | |
| CN111179957B (en) | Voice call processing method and related device | |
| JP6534781B2 (en) | System and method for third party calling voice prompts | |
| CN104104789A (en) | Voice answering method and mobile terminal device | |
| CN103227863A (en) | System and method of automatically switching call direction and mobile terminal applying system | |
| CN101504460A (en) | Method and apparatus for measuring distance between user and cam on video telephone | |
| WO2009048260A3 (en) | Visual ars service system and method enabled by mobile terminal's call control function | |
| CN109903765A (en) | Sound control method and device | |
| US20120184256A1 (en) | Communication device and method for processing incoming calls | |
| RU2721181C1 (en) | Super network construction method, method of use, device and data medium | |
| CN102743150B (en) | Method for calibrating viewpoint of eye view monitoring system, and target selecting method and dialing method applying method for calibrating viewpoint of eye view monitoring system | |
| CN1863236A (en) | Mobile phone capable of transmitting preset speech information and relative method thereof | |
| CN106131728A (en) | Intelligent integrated form Bluetooth earphone device | |
| CN106357610A (en) | Communication method and device | |
| CN105516990A (en) | Telecom fraud user analysis method and device | |
| CN105682042A (en) | Positioning and call communication method and device | |
| CN106126086B (en) | The method of adjustment of terminal device and virtual key layout | |
| CN105022473A (en) | Intelligent spectacle device and tapping tyoe human-computer interaction method for intelligent spectacle device | |
| CN205987054U (en) | Automatic switch device of conversation mode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20090812 |