DE1672391U - INTERCOM STATION WITH MICROPHONE AND SPEAKER COMBINED IN ONE HOUSING. - Google Patents

Description

(.— EDEdDEOACUSiEIC -ISeI ₅ den I, September 195 "1

^■%; company m-Td-E. PA-lp / & d

ti ""

Intercom station with hikrof on and loudspeaker combined in one housing

* ^ r- "The subject of the establishment are stations -for G-egensprecirverkenr,

• to whom .the iüLkrpfon and .the loudspeaker are in -a common "Seiause xmtergeTaracht" - ~ - ^ ~~ = t- ~ -_ - ■

The intercom system should have a gate direction-sum: Sg3reehverkehr ~ = ^

* ' _a ~ jI * between at least two stations -be understood ^ he -the S- -I »during the 3rd of the 3-use Taeide speech channels continuously ± ur 5thie Uoertra— ^ -i7' •• gung.Tyoi. ; Sesprächen free hleioen "- 3JU -Gegensatz 3.azu are" in ^the;;

K ' ' usual intercoms "special gate directions -provided, which allow the" transmission "of conversations in each case only in one line,

t "f" while the other seal is automatically blocked as long as ^ locked ^, Tais

■ - the -p $ 3üe J £ a? -Bn.eT the G-espraeh underl ^ ricnt and ^ he [others .to "begin to speak". Such gate directions are necessary to suppress the acoustic coupling *, which "with sufficient. high amplification in the electrical part of the system occurs when the loudspeakers

- every- ^ station ^ kustisoh-on- the. ^ ubsequentJEikrofone. "act.;. ^ _" can ^

They are for the suppression in electroacoustic transmission systems of a general type and especially in intercom systems except ^; "the said devices for blocking a speech path

~ - numerous other measures have become known. Particularly important f is the training of the microphone and / or loud speaker

Ϊ _ n with a directional characteristic and such a setup ~ the microphones and speakers «that the speakers acoustically

poss ^ EHST _Weni: g ^ dig microphones can-react.

File it is also known to put sound-absorbing walls between the microphone and the loudspeaker. When manufacturing a These measures are commercially usable C-intercom stations not readily usable-

An important requirement for such

■ without aggravating restrictions with regard to their

"^^ eliebigen: Satons can be used. JSs ^ söÜen i-a

.T gate precautions in insight; on the acoustic shafts of the present seam or, room in which the> Station is to be used, it is also desirable that a station can be found in the same seam as required can be set up in different places without adding anything an acoustic feedback occurs-

d - It is therefore advisable to use both the microphone and. also äen ™ - ~

ί to arrange loudspeakers in the same housing - this means that the

- Conditions for the acoustic feedback between the ieita. countrymen for the most part already "determined because" changes

^r """" by "shifting ~ the" converters against each other "-? - on" Trörnherein -——-

. are switched off,

ί Hej ^ G-edanke, loudspeaker and hikrof on in the same housing under--

Γ · spending may seem obvious to .the practical Realization of this idea with an intercom station

\ ■ creates considerable difficulties "because" in such a case

Y;: Arrangement of the mutual distance of the two landlers small

Γ and the risk of the speaker's hacking effect on the

s ι microphone particularly large actual

According to the invention Haßnahmen be given to the loudspeaker and microphone unterzubringen- in a relatively small and practically useful Senäuse by their combined effect möglieh MRAE this case should the two transducers in .Housing tv orzugsweise parallel axes or one axis angle "to about ^ΒΌ Ό ^ ueinani. ejr_aion-fcier "fc_jsein- The J scnsige arrangement is Taesonde ^ s" VuTteiinaf-fc, to a

AigesträlalteiL - ~ - 'SenaXLs jieim Boren as "autÜL ncLes" to guarantee the sound generated by the loudspeaker in speaking . In this respect, the invention is not restricted to compliance with the condition just mentioned, but is also a preferred embodiment -gelsenTizeiehnei; ,,. in order to achieve the best possible efficiency. The relevant G-esichtpunkte ± fir d-en structure of the G-ehäuses

and - & BT converters - are, according to the invention, the following - - · "- ~ -

1 ") The housing must be designed in such a way that the - -from the loudspeaker to the microphone moves directly to the microphone ^:

The distance that the sound must travel around the partition or around the housing - from the loudspeaker to the microphone - should be at least a binary wavelength of the lowest sound frequency to be transmitted * The thickness of the partition wall must be chosen in such a way = that a gnawing absorption effect occurs =, as will be explained in more detail below- - - -. ■

-2 ") According to the invention, the loudspeaker should be based on the electrodynamic System designed as zero order emitter

be educated. The practical design of the spotlight zeroth order "ordered in that the back of the sound radiating membrane outwards through a The housing is soundproofed. This execution tion has the advantage that, by preventing the acoustic gap, the fall will be seen again

ü ■■■■■ -

S ν "improved" is also i

of the sound in the 2aum
wishes is

3) The Mi] ErGf on is also as el ectr ο dynamic System built up and gate-wise with borrowed characters in the manner of a so-called figure-of-eight or lieren - • characteristic *

This training reduces the intake of sturgeon sound and reduces the risk of acoustic feedback .. The practical design of a microphone with figure eight is that the

The membrane remains open on both sides, i.e.

Can radiate to the front and back - if used of an electrodynamic system thereby becomes the frequency response, which in itself at low frequencies is a strong increase in sensitivity with a decrease towards high frequencies, due to the acoustic Final conclusion leveled.

Of these measures, it is particularly important to decouple the speaker and microphone by means of a sound-absorbing end. üiwischen? iand ~ This partition is preferably as large as made ,, that their length is at least equal to half a wave—

—5— **

is the length of the lowest voice frequency that is amplified in the transmission system. This corresponds to the requirement set out under 1), since the entire sound path """" ■: from the loudspeaker to the microphone camouflages the partition wall around it:. ^ ■ ss- " * "- .. '- at least one wavelength .. of the relevant- frequency -ent —.-!? .. · ..«., - _:

^ Appropriately, su.cn- ^ the "" whole "SehäKSB is so large ■■ ^^ - ^ η

^^ -ndas- © ehäuse - 3ie2Om * lei32ea? 5s? Ir-ä -als - this

still * veTs- & arktB ':

J! 2; e.gttenz about 800Ez ^ so you see - a song of the Sehal3-wand iron "" about 2ö cm ₃ because the wavelength in Jiuft is about em "-". ■ "

The Dioke the oehallwand must in üinblick on the absorption ^{^:;} fäliigkeit be chosen for those sound frequencies

are transmitted to a greater extent - for these it is particularly important "- ■ to prevent the reaction of the loudspeaker on the jükrof on-", to close a self-excitation of the system aTis, Da

. ".- the jiociial, absorbent ^ like ^ latte- xi-deT., Felt -Sb. & X .den .._

low frequencies only have a successful absorption effect *, it is useful for these frequencies below 800 or 1000 Hz to set up the system in such a way that no

Strengthening occurs. In this case it is possible to achieve the desired effect with partitions about 1 to 2 cm thick.

The invention is intended below with reference to the "accompanying figures be explained, '"■. -

1 shows a cross section through a speaking station in plan and FIG. 2 shows a section through the loudspeaker system in a side view. ._'_ Z- _:. .. .-;

According to Pig. 1, the microphone 1 and the loudspeaker 2 are arranged parallel to one another above the base plate 3, which is advantageous for achieving a high volume on both stations. Both converters are according to this example, according to the electrodynamic system aufgebaut- The base plate 3 "ordered for example from Έο1ζ _3" plastic "," ^ "or other \ | suitable ^ Ma-teriHl The: the .Zwischenwand 5 are OTÄsentlichen -. the end-

allied material on thawed / for example; _: | (ati? e -pd ^ rES

1 | . IFlIz ₁ , .the- on both sides T, for example, dureH · an IFetz '

ΐ§ Wire mesh held in the paralyzing 6 and 7 respectively

■ • S ■

-J will-

In the illustrated embodiment, JSükrofon and lautspreoher are mounted on the rear wall 4- The execution of the Süek- wall made of sound-absorbing material is in this J-all. Very important in order to prevent the loudspeaker from having an effect on the microphone through body reverberation - om also to keep the acoustic feedback as low as possible in the lateral direction of the airways around the outside of the housing, and both transducers will be as close as possible to the partition wall 5 arranged. In practical embodiments, the rear wall can be clad on the outside with a cover made of fabric or covered with solid panels made of plywood or plastic, for example.

The membrane of the microphone 1 is in this embodiment not encapsulated or disguised at the rear, as is the housing is open at the side. These measures bring about an approximated figure-eight characteristic.

/ Vt _ ^J

The loudspeaker 2 is in contrast to zxaa. Microphone covers a housing 8_ ″, the inside of ^{which is filled with a sound-absorbing pack 9 made of J 1} Uz, cotton wool or the like.

I ■; SöwrihT the round plate .; than ^ also the plaques can inside -

be provided with a'schäHa "bsorl> ierendem Selag", whereby ■ - the acoustic "decoupling of the two systems promoted nrjrä"

Claims (1)

ELECTR0ACUS2ie- ' ^r ^
-Society nL..b-.H «.- talks 1) Station for intercom systems with a housing containing both a loudspeaker and a lükrofon ^ characterized * that the exact Tint he iSinTugring - £ ± ner schallab sorMerendeiff- ~; 2-wisehenwand ^ wash the two transducers so designed " - _: -" F — SBhallw «g " -Z wis chen none SieXLe is less than a JTeXLerolength "deT nied ~ rigsten non-weakened ^ sound frequency to be transmitted; 2 $ Device according to Claim I _5, characterized in that it is marked *, &kß; \ the housing consists of a base plate (3 ") and a Deelrplatte (10) ^ made of ± estem material and a wall ^ 4j. as well as a partition (63 from sehallalDSOrhierendsiEjiait ^ rJLal Confesses., Whereby the plates (;> -} and KiQ ^ inside the ^ housing are covered with sound-absorbing materials. 3) Device according to claim 1 or 2, characterized. «, ~ - i.e. the ■ housingB ^ to the front and side. in the ^ BsentXielien ^ o ^ i ^ en '" or is sound-permeable- 4) door direction according to one of claims 1.-3., Characterized,, that the intermediate wall is dimensioned in its thickness and the adsorption material so that effective absorption for all j? requenzen. that in the intercom "to be strengthened-, it is guaranteed- 5) gate direction according to one of claims 1-4 _; Characterized gekennzeichne% that the two transducers are arranged with parallel axes in the housing " 6.) Yorriehtung according to one of claims 1-4, characterized in that that "both landler under one axis angle ■ of not more than 90 ° im. Housing are arranged- IL-6, ■ ^ 4 - ^ -s.-. z-_ aasen, the electro-dynamics! principle «. irr ^ ";. 837TDrrißlituni tnaeh one of the claims 1-7 * beneij that the loudspeaker membrane is closed to the" rear by a housing - (8 ") ₉ inside of which there is sometimes a filling ύβίι scnallalDsoi ^ ierendem Jimaterial (9) ' Taefinde-fc- - - ■ -. ^ T) -3orxieh * ong -near-a-d-er-inspriiehe -1-7 ^ thereby "gefcenn -""" - * "^:;" draws, ^ aI "the mkrofon and the case so excellent Mldet ^ are «that a, look characteristic: Tax the received - .See - arises ^" - - ■ ^ --- ^ >; ........ - ..-- .. ■ -. .: ■■ :: are Naeh a & ex claims "1-9-, dadur ch getennseiehnet" -SaB Mlkrxxf on speakers and with the interposition of schallahsorbierender or sound soft ^ substances in the housing such that an acoustic mounted ^ suppressed by ^{.körperschall:;} '^ föriäcitung society