SU1716626A1 - Device for determination of polarity of loudspeaker outputs - Google Patents

Abstract

The invention relates to electroacoustic measurements. The purpose of the invention is to increase the sensitivity of determining the polarity of the conclusions of low-power loudspeakers. The device contains a source of direct current 1, four terminals for connecting the first and second loudspeakers, a conductive membrane 3, which with contacts 4 and 5 forms normally open contacts, a single pulse shaper 6, resistors 7 and 8, and OR 9 and Y elements. conductive buses 11, 12, triggers 13, 14, display element 15, unit 16 for resetting the device. A single pulse of oopMnpoeateflb 6 produces a single-pole pulse. Depending on how the loudspeakers 2 and 17 are connected - phase or not, the conductive membrane 3 closes or does not close contacts 4 or 5. Phasing is considered complete when membrane 3 rejects and the LED of the display element 15 turns on. 1 il. g

Description

The invention relates to electroacoustic measurements, is intended to determine the polarity of the loudspeaker terminals and can be used in the radio industry.

The purpose of the invention is to increase the sensitivity of the device when determining the polarity of the conclusions of low-power loudspeakers.

The drawing shows the proposed device.

The device contains a source of direct current 1, terminals for connecting loudspeaker 2, conductive elastic membrane 3, contacts 4 and 5 normally open with membrane 3, shaper 6 of a single-valued pulse, resistors 7 and 8, elements OR 9 and 10, conducting bus 11 and 12 trigger ;. 13 and 14, the display element 15, the terminal setting unit 16 for connecting the loudspeaker 17, which is mounted by the diffuser opposite the loudspeaker 2.

Contacts screws 4 and 5 are configured so that they have a minimum distance on both sides of membrane 3 and do not touch it in a static state. Pins 4 and 5 are mounted on conductive busbars 11 and 12, which must be narrow enough so that the sound pressure pulse from the diffuser of loudspeaker 2 is transmitted to the elastic membrane 3.

A single-shot single-pulse or any other device that forms one current pulse at the terminals of loudspeaker 2 can serve as a single pulse shaper, in the simplest form it can be a button without latching.

The device works as follows.

At the moment of applying the supply voltage, the installation unit 16 generates a pulse, which converts the triggers 13 and 14 to the initial state, the LED (not shown) of the unit 15 is extinguished and the entire device is ready for operation.

The Q outputs of the flip-flops 13, 14 and, respectively, the second inputs of the elements are 1. At the moment of arrival of the impulse to the terminals of the antiphase-connected first loudspeaker 2 and the second 17, block b, diffusers create a sound pressure in the form of a pulse and deflect membrane 3 depending on the polarity of the outputs of the loudspeakers 2 and 17. Suppose that the membrane 3 is closed with the screw of the contact 4, and O appears at the first output of the element OR 9, which coincides with O at its second input, as a result of the output of the element

OR 9, O appears, which flips trigger 13 to another steady state. On the Q-output of the flip-flop 13, O appears, which turns on the LED of the display unit 15, and on the Q-output 1, which closes the OR 10 element at the second input. In this case, the passage of O to the output of the element OR 10 and the overturning of the second trigger 14 is excluded, even if

the closure of the membrane 3 with contact 5 at

return the diffuser to its original state

after the end of the current pulse output

Former 6 single pulse.

Shaper 6 single pulse

produces a unipolar pulse, the duration of which is approximately equal to the half-period duration of the resonance frequency of the checked loudspeakers 2 and 17, which allows reducing the current consumption of loudspeakers 2 and 17 from source 1 to a minimum and eliminating current loudspeakers

The information about the polarity of the loudspeaker outputs is stored for an unlimited time and is reset using a button (not shown) Reset, summarized in setup block 17.

The second half of the device circuit works in the same way as described.

higher for the case of a different polarity of the outputs of the loudspeaker 2 and the closure of the membrane 3 with contact 5,

When a single pulse from the imaging unit 6 arrives at the outputs of the antiphase-switched loudspeakers 2 and 17, their diffusers also work in antiphase, i.e. a single speaker loudspeaker is retracted as well. the other is pushed out. Thus sound

pressure on membrane 3 doubles. In case loudspeakers 2 and 17 operate in the same phase, i.e. their diffusers are simultaneously pushed out (pulled in), then the sound pressure from both loudspeakers

2, 17 is mutually quenched and the membrane 3 is not deflected.

In this case, the triggers 13 and 14 do not switch and the LED of the display unit 15 remains off.

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Claims (1)

Invention Formula A device for determining the polarity of the loudspeaker outputs according to the author. 5 No. 1619426, which is so that, in order to increase the sensitivity of the device, two terminals are inserted in it to connect a second loudspeaker, and the first terminal to connect the terminals of the second loudspeaker is connected with the output of a single-name driver for connecting a second pulse loudspeaker, and the first terminal for connecting is interconnected. first speaker and second terminal