Method and device for sensing surroundings of movement assistant by means of sound signals which are emitted in form of pulses

Abstract

A method for determining the position and / or the movement of objects in the surroundings of a movement assistant by means of sound signals which are emitted in the form of pulses and are reflected at at least one object is provided, in which method at least one sound pulse (S1, S2, S3), which has frequencies below the ultrasonic frequency range, is received and used. In addition, an associated device for carrying out the method, a cover apparatus for the device and a vehicle having the device according to the invention are disclosed.

Description

technical field [0001] The invention relates to a method and a device for acoustically detecting the environment of a sports assistance device and for exchanging information with the environment of the sports assistance device and between the sports assistance devices. In particular, the invention relates to a method and a device for determining the position and / or movement of an object in the environment of a movement assistance device by means of an acoustic signal emitted pulse-shapedly and reflected on at least one object, and for determining the position and / or movement of an object on the basis of the acoustic signal Changes due to reflections are used to distinguish objects reflecting said acoustic signal and to transmit information by emitting a determined signal form from a set of possible signal forms. Furthermore, the invention relates to a device for arranging an acoustic transducer, for example in a groove, the use of a covering device for covering a device accord...

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Problems solved by technology

However, in the case of narrow-band signals, and to a greater extent in the case of single-frequency signals: a higher susceptibility to interference of a receiver matched thereto, especially when exactly this frequency When disturbed

Wideband converters for transmitting acoustic signals generally require significantly more expensive generation of the signal form than narrowband converters, because due to the wideband nature, unintentional jumps in the transmission – e.g. when switching the transmission stream on and off The change that occurs when - the signal spectrum of

[0010] In addition, single-frequency systems with pulsed measurements at one signal frequency generally have the following disadvantage: In the case of multiple reflections, that is to say reflections at reflection points close to each other in propagation time, there may be The destructive addition of the reflected signal, and more precisely, the destructive addition of the echoes, occurs such that an unusually small (if not even none) signal strength reaches the receiver because the cancellation condition is satisfied

However, the complexity for signal generation or echo analysis processing is relatively high there, mainly because the prevailing electro-acoustic transducers that are actually available, in particular in relation to their installation conditions, often have an outstanding frequency response and / or have a wide-band Intense noise is also present in the case of high

[0012] In addition, in ultrasonic systems with pulsed measurements, the very natural discontinuity is a disadvantage: due to the limited transmission cycle time, that is to say from the emission of the signal pulse until the end of the associated signal arrival in the receiver Propagation time, changes in the object scene are detected only infrequently and discontinuously

[0016] The disadvantage here is that the emission of ultrasound pulses of different frequencies should only take place on the same sensor one after the other and after a pause time of several milliseconds in duration.

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