CN102961213A - Blind person environment perception method and blind person environment perception system - Google Patents
Blind person environment perception method and blind person environment perception system Download PDFInfo
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- CN102961213A CN102961213A CN2012104362657A CN201210436265A CN102961213A CN 102961213 A CN102961213 A CN 102961213A CN 2012104362657 A CN2012104362657 A CN 2012104362657A CN 201210436265 A CN201210436265 A CN 201210436265A CN 102961213 A CN102961213 A CN 102961213A
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Abstract
The invention discloses a blind person environment perception method and a blind person environment perception system. The blind person environment perception method comprises the following steps of transmitting continuous ultrasonic waves by an ultrasonic wave transmitting device, continuously receiving echoes transmitted by the ultrasonic wave transmitting device and reflected back through obstacles in real time by two ultrasonic wave receiving devices, respectively carrying out frequency reduction treatment for the echoes received by the two ultrasonic wave receiving devices until the frequencies are reduced to be within a frequency range capable of being heard by human ears, and respectively playing the echoes through two earphones. The blind person environment perception system comprises the ultrasonic wave transmitting device and the two ultrasonic wave receiving devices. According to the blind person environment perception method and the blind person environment perception system, disclosed by the invention, echo signals of the same transmitting wave, reflected (comprising diffuse reflection and diffraction) back from different far and near surfaces of an object, can be received, any object information is not omitted, the object information is reserved to the maximum, the frequency is reduced in real time, the outline, the surface shape variation, the distance, the movement, the material and the like of the object can be distinguished by a blind person through the difference of heard sounds, thus a three-dimensional model of the object or a scene object can be built in the brain of the blind person, and the blind person can be helped perceiving the world again.
Description
Technical field
The present invention relates to a kind of blind person's product, particularly a kind of environment perception method and device of launching continuous ultrasonic.
Background technology
In the prior art, ultrasound wave substantially all is as range finding in the application of existing blind person's utensil, speed, the dynamics by vibration or change into language and inform the blind person then, and the effect of the blind rod that the effect root of these modes is is similar; In order to help the blind person to re-recognize and the perception world, occurred on the market various blind person aid devices and omniselector and so on etc., be that to be called " Sterosonic ultrasonic blindman-helping tool " and number of patent application be that 01255716.1 utility model patent name is called in two pieces of patent documentations of " ultrasonic echo navigator for blind person " and all proposes with adopting impulse ejection and receiving signal for 200610134831.3 patent of invention name such as number of patent application, but the fatal shortcoming of impulse ejection and receiving system is the pulse signal that receives can lose the object information of reflection, and main manifestations is:
1, adopts impulse ejection and reception, what receive also is pulse echo, the echo that normally is reflected back from the nearest barrier of transmitter-receiver device, therefore usually the information whether the place ahead has barrier and barrier distance can only be obtained, the information such as body form in environment and the environment, size can't be reflected.
2, adopt pulse signal, if object not in two receiving system centre positions, the echo life period that two receiving systems receive is poor, the time difference of this time difference and pulse near the time, be difficult to distinguish, so also can't accurately reflect object information.
Therefore, existing technology and product only can judge whether the place ahead has the distance of barrier and barrier, and the obvious sharp keen border of barrier, and the change information slow for barrier inclined-plane, cambered surface, convex-concave variation etc. can't reflect.
For realizing accurately reflecting environmental information, adopt the sonar equipment of ultrasonic reflections echo-wave imaging technology, be to consist of the reception basic matrix by many many receiving transducers are set.But for 200610134831.3,01255716.1 this technology, can't be suitable for, because only have at most two earphones.So the product take 200610134831.3,01255716.1 technology as source is not still realized producing and using at present.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of blind person's environment perception method and sensory perceptual system, can be more all sidedly environmental information be informed the blind person in the mode of sound, realize that the blind person is to the perception of environment.
A kind of blind person's environment perception method, send continuous ultrasonic by ultrasonic transmission device, receive in real time continuously the echo that described ultrasonic transmission device sends and the process barrier reflects by two ultrasonic probe, ultrasonic receivers, the echo that two ultrasonic probe, ultrasonic receivers are received carries out respectively down conversion process and is reduced to the frequency range that people's ear can be heard, plays back through two earphones respectively.
Above-mentioned blind person's environment perception method, the frequency range after the described down conversion process are 50hz-5khz.
A kind of blind person's environment sensing system comprises ultrasonic transmission device and two receiving systems, and described ultrasonic transmission device is the ultrasonic continuous discharger, comprises frequency dividing circuit, booster transformer T1 and ultrasonic emitting probe; Described ultrasonic probe, ultrasonic receiver comprises that ultrasound wave receiving transducer, amplifying circuit, a fundamental frequency signal produce circuit, mixting circuit and filter circuit, the ultrasound wave receiving transducer be connected a filtering and connect, a described amplifying circuit be connected fundamental frequency signal and produce circuit and all be connected with described mixting circuit, described mixting circuit is connected with described earphone S1 by filter circuit.
Above-mentioned blind person's environment sensing system, described frequency dividing circuit comprises frequency divider, the external crystal oscillator Y1 of described frequency divider, crystal oscillator Y1 is in parallel with a RC oscillating circuit.
Above-mentioned blind person's environment sensing system, described RC oscillating circuit comprises resistance R 1 and capacitor C 1 and capacitor C 2, one end of described capacitor C 1 and capacitor C 2 is connected to the two ends of described resistance R 1, and described capacitor C 1 is connected the other end and is connected with ground with capacitor C, and described resistance R 1 and described crystal oscillator Y1 are in parallel.
Above-mentioned blind person's environment sensing system, also comprise audion and resistance R 4, are connected with resistance R with the base stage of audion 8050 respectively and are connected in the two ends of the primary side of described booster transformer T1, resistance R 4 connects power supply, the two ends of the secondary side of described booster transformer T1 are connected with the two ends of ultrasonic emitting probe U1 respectively, also are parallel with capacitor C 4 outside described booster transformer T1 secondary side two ends.
Above-mentioned blind person's environment sensing system, described ultrasound wave receiving transducer is connected with a described amplifying circuit, and a described amplifying circuit is composed in series by two dual operational amplifier integrated circuits.
Above-mentioned blind person's environment sensing system, described filter circuit is bandwidth-limited circuit.
Above-mentioned blind person's environment sensing system, described fundamental frequency signal generation circuit is the low-frequency phase-locking ring functional generator based on phase locking unit and waveform generator.
Above-mentioned blind person's environment sensing system, the output that described fundamental frequency signal produces circuit is provided with single pole multiple throw, and described single pole multiple throw connects the resistance of a plurality of parallel connections, and the other end of the resistance of a plurality of parallel connections is connected with mixting circuit.
The invention has the beneficial effects as follows: use continuous ultrasonic signal, and receive continuously, the real-time reflection that will receive comprises the signal of all objects information, can receive the echo that same transmitted wave reflects from the far and near different surfaces of object, comprise the echo-signal behind diffuse-reflectance and the diffraction, do not omit any object information, reach the information that keeps to greatest extent object, and with the signal that receives real-time mix down to the suitable frequency that people's ear can be heard, conversion by sound amplitude, two ears hear phase contrast and different tone color and the performance of volume of sound, tell the profile of object, surface configuration changes, far and near, motion and material etc., so just can set up at blind person's brain the threedimensional model of object or on-the-spot object, help the blind person to set up an again approach in the cognitive world.
Description of drawings
Fig. 1 is the ultrasonic transmission device circuit diagram of blind person's environment sensing of the present invention system,
Fig. 2-1 and Fig. 2-2 is combined as the receiving system circuit diagram of blind person's environment sensing of the present invention system,
Fig. 3 is the schematic diagram of blind person's environment sensing of the present invention system.
The specific embodiment
The present invention is described further by reference to the accompanying drawings:
A kind of blind person's environment perception method, send continuous ultrasonic by ultrasonic transmission device, receive in real time continuously the echo that described ultrasonic transmission device sends and the process barrier reflects by two ultrasonic probe, ultrasonic receivers, the echo that two ultrasonic probe, ultrasonic receivers are received carries out respectively down conversion process and is reduced to the frequency range that people's ear can be heard, frequency range after the down conversion process is 50hz-5khz, plays back through two earphones respectively.
As shown in Figure 3, a kind of blind person's environment sensing system comprises ultrasonic transmission device and two receiving systems, and described ultrasonic transmission device is the ultrasonic continuous discharger, comprises frequency dividing circuit, booster transformer T1 and ultrasonic emitting probe; Described ultrasonic probe, ultrasonic receiver comprises that ultrasound wave receiving transducer, amplifying circuit, a fundamental frequency signal produce circuit, mixting circuit and filter circuit, the ultrasound wave receiving transducer be connected a filtering and connect, a described amplifying circuit be connected fundamental frequency signal and produce circuit and all be connected with described mixting circuit, described mixting circuit is connected with described earphone S1 by filter circuit.
As shown in Figure 1, described frequency dividing circuit comprises frequency divider, the external crystal oscillator Y1 of described frequency divider, crystal oscillator Y1 is in parallel with a RC oscillating circuit, described RC oscillating circuit comprises resistance R 1 and capacitor C 1 and capacitor C 2, crystal oscillator Y1 two ends respectively connect capacitor C 1 and the capacitor C 2 rear ground connection of 20pF, resistance is that the resistance R 1 of 1M Ω is in parallel with crystal oscillator, described frequency divider adopts the CD4060 chip, the external crystal oscillator Y1 of its 9th and the 10th pin, the 12nd pin is CD4060 chip reset end, the resistance R 2 rear ground connection of external resistance 10K Ω, the 16th pin is external+5V power supply and be connected with the capacitor C 3 rear ground connection of 0.1 a μ F, and after connecting, the resistance R 3 of the external resistance 10K Ω of the 6th pin is connected with the colelctor electrode of audion 8050, and the base stage of audion 8050 is connected with an end of the primary side of described booster transformer T1.
The other end of described booster transformer T1 and resistance are that the resistance R 4 of 50 Ω is connected, resistance R 4 connects+the 5V power supply, the two ends of the secondary side of described booster transformer T1 are connected with the two ends of ultrasonic emitting probe U1 respectively, also are parallel with the capacitor C 4 of a 1000pF outside described booster transformer T1 secondary side two ends.
Process of transmitting: the ultrasonic signal that the crystal oscillator of 5.120 models produces fixed frequency becomes the continuous ultrasonic signal of 20khz-1MHz fixed frequency behind CD4060 chip frequency division, passing to the ultrasonic emitting hair after booster transformer T1 amplifies penetrates, launch the square wave of 20KHz-150KHz, 3 one-tenth fan-shaped forwards 15 °-120 ° continuous square-wave signals of emission of emitting head.
Shown in Fig. 2-1 and Fig. 2-2, the node 2 of Fig. 2-1 links together with the node 1 of Fig. 2-2 and is complete signal receiving circuit, and Fig. 2-2 produces circuit for fundamental frequency signal.
Described ultrasound wave receiving transducer one end is connected with ground, after being connected with the filter capacitor of 100 μ F, the other end is connected with a described amplifying circuit, the described amplifying circuit of resistance that is 10K Ω by a resistance is composed in series by two dual operational amplifier integrated circuits, the dual operational amplifier integrated circuit is reversed feedback amplifier, amplify 100 times by twice reverse sound frequency that amplifies receiving, 1 pin and 4 pins of audio frequency after amplifying by multiplier MC1496 enter into multiplier MC1496 and fundamental frequency signal and produce the sinusoidal wave reference signal that circuit produces and carry out mixing, and 2 pins and 3 pins of multiplier MC1496 carry out gain-adjusted to signal; The described filter circuit of described filter circuit is bandwidth-limited circuit, is in series with a power amplifier resistor between described bandwidth-limited circuit and the described multiplier MC1496, and the power amplifier resistor is used for the size of the sound of adjusting earphone broadcast.
Described fundamental frequency signal generation circuit is the low-frequency phase-locking ring functional generator based on phase locking unit MC145151 and waveform generator ICL8038, the low-frequency phase-locking ring functional generator enters in the multiplier MC1496 with the audio frequency that receives and carries out mixing in order to send baseline sinusoidal wave, the N enumerator input pin of the square wave output pin of waveform generator ICL8038 and phase locking unit MC145151 is connected, waveform generator ICL8038 is to phase locking unit MC145151 input square-wave signal, 19 pins of phase locking unit MC145151,20 pins, 22 pins, 23 pins, 24 pins and 25 pins connect common port and are communicated with 28 pins of phase locking unit MC145151,28 pin output phase locking signals, the external light emitting diode of 28 pins is in order to indicate lock-out state, the benchmark concussion frequency of the external 20KHz-150KHz of 27 pins, 4 pins of phase locking unit MC145151 connect a wave filter as phase discriminator output and carry out filtering, wave filter is comprised of a double operational integrated circuit NE5532, wave filter output connects an amplifying circuit that is made of double operational integrated circuit NE5532 again and carries out the signal amplification, the frequency modulation scan input end of amplifier output welding wave generator ICL8038.
After waveform generator ICL8038 receives the signal that phase locking unit MC145151 passes back, 4 pins of waveform generator ICL8038 and 5 pins carry out period frequency adjustment regularly, 1 pin of waveform generator ICL8038 and 12 pins connect respectively outward after the adjustment of slide rheostat offset of sinusoidal waveform the baseline sinusoidal wave frequency is passed among the multiplier MC1496 and carry out mixing with the audio frequency that receives, the output that produces circuit at fundamental frequency signal is provided with single-pole double-throw switch (SPDT), described single-pole double-throw switch (SPDT) connects the resistance of the different resistances of two parallel connections, the other end of the resistance of two parallel connections is connected with mixting circuit, single-pole double-throw switch (SPDT) is in order to select two kinds of effective service ranges, can measure two meters echos in the scope such as one grade, another grade can be measured the echo in four meters scopes.
6 pins and 12 pins of signal after the mixing by MC1496 are passed to bandwidth-limited circuit and carry out filtering, audio frequency after the filtering is play by earphone and is passed in the ear of user, at this moment user just can have been heard sound, the phase contrast of the sound in the size of the difference of user by the sound tone color heard, volume, the variation of amplitude and two earphones just can be judged the profile of object, distance, kinestate and the material of distance oneself, makes the action of hiding with this.
Above-described embodiment only is for the invention example clearly is described, and is not the restriction to the invention specific embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give all embodiments exhaustive.All any apparent variations of being extended out within the spirit and principles in the present invention or change still are among the protection domain of the invention claim.
Claims (10)
1. blind person's environment perception method, it is characterized in that: send continuous ultrasonic by ultrasonic transmission device, receive in real time continuously the echo that described ultrasonic transmission device sends and the process barrier reflects by two ultrasonic probe, ultrasonic receivers, the echo that two ultrasonic probe, ultrasonic receivers are received carries out respectively down conversion process and is reduced to the frequency range that people's ear can be heard, plays back through two earphones respectively.
2. the method for claim 1, it is characterized in that: the frequency range after the described down conversion process is 50hz-5khz.
3. blind person's environment sensing system is characterized in that, comprises ultrasonic transmission device and two receiving systems, and described ultrasonic transmission device is the ultrasonic continuous discharger, comprises frequency dividing circuit, booster transformer T1 and ultrasonic emitting probe; Described ultrasonic probe, ultrasonic receiver comprises that ultrasound wave receiving transducer, amplifying circuit, a fundamental frequency signal produce circuit, mixting circuit and filter circuit, the ultrasound wave receiving transducer be connected a filtering and connect, a described amplifying circuit be connected fundamental frequency signal and produce circuit and all be connected with described mixting circuit, described mixting circuit is connected with described earphone S1 by filter circuit.
4. blind person's environment sensing according to claim 3 system is characterized in that described frequency dividing circuit comprises frequency divider, the external crystal oscillator Y1 of described frequency divider, and crystal oscillator Y1 is in parallel with a RC oscillating circuit.
5. blind person's environment sensing according to claim 4 system, it is characterized in that, described RC oscillating circuit comprises resistance R 1 and capacitor C 1 and capacitor C 2, one end of described capacitor C 1 and capacitor C 2 is connected to the two ends of described resistance R 1, described capacitor C 1 is connected the other end and is connected with ground with capacitor C, described resistance R 1 and described crystal oscillator Y1 are in parallel.
6. blind person's environment sensing according to claim 3 system, it is characterized in that, also comprise audion and resistance R 4, are connected with resistance R with the base stage of audion respectively and are connected in the two ends of the primary side of described booster transformer T1, resistance R 4 connects power supply, the two ends of the secondary side of described booster transformer T1 are connected with the two ends of ultrasonic emitting probe U1 respectively, also are parallel with capacitor C 4 outside described booster transformer T1 secondary side two ends.
7. blind person's environment sensing according to claim 3 system is characterized in that described ultrasound wave receiving transducer is connected with a described amplifying circuit, and a described amplifying circuit is composed in series by two dual operational amplifier integrated circuits.
8. blind person's environment sensing according to claim 3 system is characterized in that the described filter circuit of described filter circuit is bandwidth-limited circuit.
9. blind person's environment sensing according to claim 3 system is characterized in that, it is low-frequency phase-locking ring functional generator based on phase locking unit and waveform generator that described fundamental frequency signal produces circuit.
10. arbitrary described blind person's eye system according to claim 3-9, it is characterized in that, the output that described fundamental frequency signal produces circuit is provided with single pole multiple throw, and described single pole multiple throw connects the resistance of a plurality of parallel connections, and the other end of the resistance of a plurality of parallel connections is connected with mixting circuit.
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| CN105979437A (en) * | 2016-07-13 | 2016-09-28 | 微鲸科技有限公司 | Audio play device and audio system |
| CN107907861A (en) * | 2017-11-07 | 2018-04-13 | 河北科技大学 | A kind of flooring transport vehicle ultrasonic wave positioning control system and its control method |
| CN107981886A (en) * | 2017-11-23 | 2018-05-04 | 西安电子科技大学 | The analog signal processing circuit of ultrasonic imaging |
| CN110840718A (en) * | 2019-11-29 | 2020-02-28 | 河南中医药大学 | Ultrasonic blind guiding method, system and device based on audible audio characteristics |
| CN111035544A (en) * | 2019-12-26 | 2020-04-21 | 吕日鹏 | Navigation system for blind people |
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