DE8128111U1 - SPEAKER MICROPHONE - Google Patents

Description

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Dipl.-Ing. H.-P. Lieck patent attorney Maximiiiansplatz 10 D-8000 Müncherv2

Helmut Brähler conference technology
G 125 37

description

Speaker microphone

The invention relates to a loudspeaker-microphone for the subscriber stations a discussion system according to the preamble of claim 1.

Electroacoustic discussion systems facilitate or enable that Understanding between the participants in a larger discussion group, e.g. B. at a conference. There are several microphones in the meeting room set up distributed ,, which are each assigned to one or more call participants and optionally, z. B. can be switched on by the interlocutor. The contributions to the discussion of the individual Participants are made audible by loudspeakers for all participants. Because the use of only a few large loudspeakers causes feedback and can cause reflections, a decentralized sound system is generally used through many sound sources distributed in the room low power, which create a diffuse and not perceived as annoying switching field. You can use small speakers in Install conference tables or the microphone stands. Although this is technically particularly simple, it has the disadvantage that greater sound power levels are required because the sound radiation cannot be directed directly at the call participants or at the sound sources can be accidentally covered.

European Patent Attorney i "j £ ugejjassene £ • Representative bfclm'European Patent Office TA: Technolaw Telephone (089) 22 08 21 Telex 5 21 6 741 Mi d ''Po'tfttchräfMunich> 1148 58-806 Rtuechelbank Munich 2 601205

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Loudspeaker microphones for discussion systems are therefore already known in which the participant microphones with loudspeakers are combined in a common housing to form a structural unit. With these well-known loudspeaker microphones Housing has a circular cylindrical cross-section, and the loudspeaker chassis is built into the housing behind the microphone capsule in such a way that that its main plane is parallel to the end walls of the housing, that is, its sound emission axis with the cylinder axis of the housing coincides. But this has the disadvantage that the dimensions of the Loudspeaker membrane are limited to relatively small values, which is why the sound radiation is insufficient at low frequencies. In addition, because of the located in the radiation lobe of the speaker Microphone capsule does not provide direct sound to the individual interlocutors.

Accordingly, it is an object of the invention to provide one Loudspeaker microphones for discussion systems based on the optimal Public address for the users of the discussion system is guaranteed.

This object is according to the invention with that in claim 1 and with regard to advantageous embodiments in the subclaims characterized loudspeaker-microphone solved.

Since the housing of the loudspeaker microphone according to the invention has an approximately has a rectangular cylinder cross-section, it provides fin construction of the loudspeaker chassis with its main plane parallel to the two large ones Side walls of the housing space for a comparatively large loudspeaker chassis, which is arranged directly above the sound outlet openings in the lower of the two large side walls. Since the lower large side wall facing the stand and the housing on the gooseneck protruding from the stand usually obliquely upwards towards the participant is aligned, there is an extremely favorable SchaH radiation, where the majority goes directly to the participant and the

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Rest after simple reflection on the table surface on which the stand is placed on or in which the stand is built in. In this way is used in conjunction with the good radiation of lower frequencies due to the comparatively large dimensions of the loudspeaker chassis overall, optimal speech intelligibility is achieved with the loudspeaker-microphone according to the invention.

The acoustic properties of the new speaker-microphone will be particularly favorable when applying the measures of claim 2.

The readiness for recording of the microphone in the loudspeaker-microphone according to the invention is best displayed with a signal light arranged according to claim 3 and 4. While with a well-known speaker-microphone such a signal light is provided in the front end wall of the housing, i.e. directly in front of the microphone capsule, where it adversely affects the acoustic properties, it is in the case of the loudspeaker-microphone according to the invention in an acoustic neutral area and is also particularly well visible, especially from a distance z. B. for the interviewer.

The following is the invention with further advantageous details i explained in more detail using a schematically illustrated embodiment. In the drawing show:

Figure 1 is a perspective view of a loudspeaker microphone according to the invention ρ

FIG. 2 shows a bottom view of the housing of the loudspeaker-microphone Figure 1,

FIG. 3 shows a longitudinal section through the housing according to FIG. 2, FIG. 4 is a front end view of the housing according to FIG. 2.

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?? According to Figure 1, a loudspeaker-microphone comprises a desk-shaped ; - Stand 1, from which a flexible gooseneck 2 protrudes. The gooseneck carries at its free end a cylindrical plastic housing 3 with a rectangular cylinder cross-section in principle, which is attached to a ; rear end wall 4 is connected to the gooseneck 2. The housing : se has two large side walls 5 and 6; on the narrow side walls j 7 and 8 it differs from the strict rectangular shape of its cross-section -i in that it deforms into a strong convex rounding ; i are, see Figure 4. The front, slightly convex end wall 9 of the housing, ί ses 3 has a sieve-like training, which means that numerous sonic I inlet openings for the entry of the sound into the housing ge-I create are.

I The housing is attached to the gooseneck 2 in such a position that

I that it has a large side wall, namely the lower large side

I wall 6 facing the stand 1, with normal use

I dated the loudspeaker-microphone on a table surface or the like

! Starting from the gooseneck, it is inclined upwards.

On the upper major side wall has a nalleuchte upward wegstehende Sig- ¹ 10 is attached, which is a colored translucent plastic member which 11 covers a small lamp in the interior of the housing. See Figure 3.

The housing consists of two, each encompassing a large side wall Half-shells 3a and 3b, which are plugged together and held together with screws 12. Inside the housing is through one to the End walls 4 and 9 parallel partition 13 divided into a front chamber 14 and a rear chamber 15.

In the front chamber 14 between the partition 11 and the front Front wall 9 has a circular cylindrical microphone capsule 21 which is acoustically directed forwards towards the perforated front wall 9.

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ti slots 16 in the side walls 5-8 of the housing in the area of the front |

Ren chamber 14 form sound compensation openings for the microphone capsule.

In the rear chamber 15 are a loudspeaker chassis 22 and a Circuit board 23 added. The lower side wall 6 of the housing has several slots 17 in the region of the chamber 15, see FIG 2, which represent sound outlet openings. The loudspeaker chassis 22 is perpendicular to the two with its sound emission axis large side walls arranged directly above these sound outlet openings 17, so that his membrane, not shown in detail, the Sound outlet openings is facing.

The speaker chassis 22 is from one to the large side walls 5 and 6 parallel circuit board 23, which carries several electronic components, not shown in detail, which a microphone amplifier form. In addition, the lamp 11 of the signal light 10 is attached to the circuit board 23.

Claims (4)

D! Pl.-ing. H.-P. Lieck patent attorney Maximiliansplatz 10 D-§000 Munich Helmut Brähler conference technology G 125 37 claims 1. Loudspeaker microphone for the participant positions in a discussion system with a loudspeaker chassis, a microphone capsule and an approximately cylindrical housing for both, the one at the rear Front wall is connected to a flexible gooseneck protruding from a stand, in the front front wall sound inlet opening "Has openings for the entry of the sound to the microphone capsule facing forward and is provided with a signal light that is visible from the outside,"
characterized in that the housing (3) is approximately rectangular ! Has cylinder cross-section and with a lower one of its two large ones Side walls (5, 6) facing the stand (1), and that the loudspeaker chassis (22) with its emission axis perpendicular to the large side walls directly above the sound outlet openings (17) in the lower side wall (6) is arranged. 2. Loudspeaker microphone according to claim 1, characterized in that the housing (3) by one to the end walls (4, 9) parallel partition (13) is divided into two chambers (14, 15), of which the front only the microphone capsule (21) and the rear contains the loudspeaker chassis (22). 3. Loudspeaker microphone according to claim 1 or 2, European Patent Attorney [ - £ ugelasserfef. Representative tgeinv European Patent Office TA: Tectinolaw Telephone (089) 220821 Telex 5215741 litt d ^: -PoWcheök MüWchen-114856-806 Reuochelbank Munich 2601 j ••••• "j'IJi characterized in that the signal light (10) from the upper large Side wall (5) protrudes upwards. 4th Loudspeaker microphone according to claim 3, characterized in that the signal light (10) in the area of the rear Chamber (15) is provided.