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A Human-Computer Interaction Method for Hand Positioning of Portable Devices Based on Commercial Devices
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A technology of portable devices and palms, which is applied in the field of hand positioning of portable devices, human-computer interaction, and acoustic ranging in mobile computing, which can solve the problems of increased user interference and weak anti-interference ability
Inactive Publication Date: 2019-01-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
[0004] 2) Weak anti-interference ability: there are other interference signals in real life, and the multipath effect also has a certain impact on the application system based on wireless positioning;
[0005] 3) The user is required to carry equipment for wireless positioning, which increases the interference to the user;
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[0051] This part will describe in detail the echo-based device-free precise positioning method in combination with the above-mentioned drawings.
[0052] This embodiment illustrates the schematic diagram of the principle of the method proposed in the present invention and the linear frequency modulation audio signal waveform designed in step 1 of the content of the invention, such as figure 1 shown in the lower part.
[0053] Depend on figure 1 It can be seen that the method proposed in the present invention includes three parts: initialization, perception and positioning; initialization includes signal generation; perception includes signal framing; positioning includes denoising, signal detection, and coordinate calculation.
[0054] Specifically to the embodiment of this embodiment, the steps are as follows:
[0055] Step A, signal generation: In order to use the audio signal for positioning, the smart handheld device needs to call the speaker to send out the two-channel ...
Embodiment 2
[0072] In order to verify the beneficial effect of the present invention, embodiment 1 is verified by a real experiment.
[0073] The specific implementation of this embodiment is completed by placing the calculation module in the acoustic palm positioning system on which the method proposed by the present invention is based in an external server; that is, the system on which the present invention is based consists of a client and a server.
[0074] Among them, the client (smartphone equipped with stereo speakers) periodically sends a two-channel chirp signal, and continuously records, and finally the recorded audio will be sent to the server. The server performs position calculations and returns the calculated coordinates to the client.
[0075] A smartphone with stereo speakers plays the role of the client. In particular, since the audio chip of the iPhone 4s can process 20kHz audio signals, the present invention implements our proposed hand positioning system on the iPhone...
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Abstract
A commercial equipment-based equipment carrying-free palm-positioning human-computer interaction method comprises an initializing stage, a sensing stage, a ranging stage and a position estimating stage, wherein in the initializing stage, an acoustic palm positioning system generates a two-sound track linear frequency-modulated audio signal and initializes threads of a microphone and a loudspeaker to ensure that before the loudspeaker works, the microphone is turned on; in the sensing stage, a stereo sound box sends out the two-sound track linear frequency-modulated audio signal, and the microphone continuously records an echo signal obtained by reflecting the two-sound track linear frequency-modulated audio signal by a palm of a user and converts the echo signal to data; in the ranging stage, a processing thread module of the acoustic palm positioning system divides the echo data recorded in the sending phase into fragments and denoises the echo data, finds original audio and echo data and exports the time of flying of sound; in the position estimating stage, the palm of the user is positioned by using a triangular relationship among the palm, a left sound track and a right sound track, and then an estimating error is reduced by a smoothing method. By the commercial equipment-based equipment carrying-free palm-positioning human-computer interaction method, the positioning accuracy reaches a centimeter level; interference on the palm of the user is relatively small, and an equipment carrying-free effect is achieved.
Description
technical field [0001] The invention relates to an acoustic ranging method for mobile computing, in particular to a human-computer interaction method based on a commercial device-free palm positioning device, which belongs to the field of computer human-computer interaction. Background technique [0002] With the popularization of mobile smart terminals, the applications of mobile smart terminals are becoming more and more extensive, for example, context inference systems, gesture tracking systems, and passive personnel positioning. This makes the user's interaction with the mobile smart terminal more convenient. Among them, the gesture tracking system is increasingly becoming an important way of human-computer interaction. In the gesture tracking system, the perception and positioning of the user's palm is a key part. Wireless positioning is the key technology for positioning the user's palm, and is an important research direction in the field of mobile computing. Accordi...
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