SU229256A1 - Ultrasonic sonar - Google Patents

Description

There are known devices for orientation of the blind in space, which contain an ultrasonic emitter, a generator, a receiver, a wideband amplifier, a synchronizer, a group of tactile razdrali transforming electrical oscillations from the amplifier of the receiver into mechanical ones felt by the palm.

The proposed echo-locator differs from the known ones in that it contains: a device for measuring and storing the delay time of the echo signal, a decoder that divides the scope of the locator into zones; a system that creates a variable resolution locator; a system that provides a frequency of oscillations of skin irritants equal to or a multiple of the frequency of the sounding signals; a system that provides a tactile effect only in the pauses between the end of the measurement of the echo signal and the beginning of the radiation of the next probe pulse.

Such an implementation of the echo-locator allows instantly determining the distance to the obstacle, as well as the zone of action of the radiator, differentially estimating the distance to the obstacle, eliminating the influence of external acoustic interference, and excluding positive acoustic feedback.

Handle with receiving-transmitting part and tactile unit.

The locator transmitter contains the master oscillator /, the circuit 2 for forming the duration of the package of ultrasonic vibrations, the high frequency generator .5, the power amplifier 4. Electro-acoustic transducer 5 is made in the form of a reversible condenser microphone with the 6-pitch initial circuit

tension The receiver includes a resonant amplifier 7, an envelope detector 8 and a pulse amplifier 9.

The time interval measurement circuit includes a counting pulse generator 10, a static trigger 11, a matching circuit 12. The pulse counter is assembled on triggers 13-18.

The polling scheme of the decoder 19 contains the triggers 20, 21 and the frequency divider in the form

a two-bit counter on the flip-flops 22 and 23. The control includes a delay circuit 24, a differentiating RC-chain 25, a logic circuit 26, a delay circuit 27, and a circuit 28 for resetting the counter 29.

A set of pulse amplifiers 30-39 consists of an emitter follower and a cascade with a common emitter.

A handle with a receiving-transmitting part and a tactile unit consists of a body 50, a head 5 / and tactile elements 52.

Subject invention

Claims (5)

1. An ultrasonic echo-locator, including a transmitter and receiver, characterized in that, in order to instantly determine the distance to the obstacle, it contains a device for measuring and storing the delay of the echo signal, consisting For example, from a trigger, a joint scheme, a pulse generator with a counter, and a breaker that breaks the sphere of action of the locator in the zone. 2. The echo-locator according to claim 1, characterized in that, in order to improve the accuracy of determining the distance, it contains skin stimuli, the actions of which correspond to the zones of action of the locator. 3. The echo locator according to claim 1, characterized in that, for the purpose of differential estimation of the distance, the decryptor contains a system that creates a variable resolving ability of the locator with the maximum value of the latter at a distance of 2-3 m. 4. Echo locator but n. 1, characterized in that, in order to eliminate external acoustic noise, it contains a system providing a frequency of oscillations of skin stimuli, equal to or a multiple of the frequency of the sounding signals. 5.Echo-locator no. 1, characterized in that, in order to eliminate acoustic positive feedback between skin irritants and the locator receiver, it contains a system that provides tactile action only in the pauses between the end of the echo change and the radiation of the next probe pulse.