fig1 shows a microphone carrier 1 fashioned as a plastic injection - molded part , in side view . to form a microphone module , three microphones can be attached to the microphone carrier 1 in sections 1 a , 1 b and 1 c of the microphone carrier 1 . two of the microphones are spatially separated by a web 1 d of the microphone carrier 1 . in the production of the microphone carrier according to an embodiment of the invention , in a first method step , a plastic injection - molded part is produced in the shape visible from fig1 . to generate conductor traces on the plastic injection - molded part , the method steps add metallization and structuring . for attachment and electrical contacting , a plurality of microphones are subsequently soldered onto the thusly produced microphone carrier 1 . fig2 shows the microphone carrier 1 from above . from this view , the conductor traces 2 - 6 directly applied on the microphone carrier 1 for electrical contacting of the microphones are visible . it is clear that both conductor traces 2 and 3 for the voltage supply of the microphones respectively comprise contacts for contacting all three microphones . furthermore , the microphone carrier 1 comprises a separate signal line / conductor for each microphone . in the assembly of the microphone module , the microphone arranged in the partition 1 a of the microphone carrier 1 visible from fig1 is soldered with its microphone contacts to the contact points 2 c , 3 c and 6 a for attachment and for electrical connection . the attachment and contacting of both other microphones ensues on the bottom of the microphone carrier 1 . the conductor traces 2 - 5 are therefore provided with feed - through holes 2 a , 2 b , 3 a , 3 b , 4 a and 5 a , through which the conductor traces are passed for further continuation on the bottom of the microphone carrier 1 . altogether , the electrical connection of the three microphones ensues via the five conductor traces 2 - 6 . to connect the microphone module with an amplifier ( not shown ), only five ( instead of the normal nine ) connection conductors are thus necessary . the microphone module thereby contributes to a lowering of the production costs of a hearing aid device . the bottom of the microphone carrier 1 is visible from fig3 . the microphone carrier 1 in the exemplary embodiment also comprises conductor traces on its bottom , namely the conductor traces 7 and 10 that are continuations of the conductor trace 2 , the conductor traces 8 and 11 that are continuations of the conductor trace 3 , the conductor trace 9 that is a continuation of the conductor trace 4 , and the conductor trace 12 that is a continuation of the conductor trace 5 . the continuations of the conductor traces may be ( as is specified in fig2 ) formed by way of the feed - throughs 2 a , 2 b , 3 a , 3 b , 4 a and 5 a for continuation of the respective conductor trace on the opposite side of the microphone carrier 1 . the conductor trace sections on the bottom of the microphone carrier 1 respectively end at a contact point 2 d , 3 d , 4 b ( for one microphone ) or , respectively , 2 e , 3 e , 5 b ( for a further microphone ). the contact points for respectively one microphone may be separated from one another by the web 1 d . both microphones on the bottom of the microphone carrier 1 may be also soldered with the contact points 2 d , 3 d 4 b , 2 e , 3 e and 5 b for attachment as well as for electrical connection . fig4 shows the microphone carrier 1 with the three microphones 13 , 14 and 15 attached on it . each microphone comprises three microphone contacts , of which respectively only the front microphone contact 13 a , 14 a or , respectively , 15 a is visible in fig4 . the microphone 13 is soldered to its microphone contacts at the contact points 2 c , 3 c and 6 a ( compare fig2 ) on the top of the microphone carrier ; the two microphones 14 and 15 with their microphone contacts are soldered to the contact points 2 d , 3 d , 4 b or , respectively , 2 e , 3 e and 4 b on respectively one side of the web 1 d ( compare fig3 ). furthermore , five connection cables 16 - 20 are visible for electrical connection of the microphone module with an amplifier unit ( not shown ). fig5 shows the microphone module with the microphone carrier 1 and the three microphones 13 , 14 and 15 from below . from this view , three sound inlets ( fashioned as sockets 13 d , 14 d and 15 d ) of the microphones 13 - 15 are visible . furthermore , from this view , at the microphones 14 and 15 their microphone contacts 14 a , 14 b , 14 c or , respectively , 15 a , 15 b , 15 c are recognizable . these are soldered to the contact points 2 e , 3 e , 5 b or , respectively , 2 d , 3 d , 4 b on opposite sides of the web 1 d . in addition , fig5 also shows the five connection cables 16 - 20 for electrical connection of the microphone module with an amplifier unit ( not shown ). fig6 shows a section of a behind - the - ear hearing aid device 21 in which a microphone module according to the invention is located . in fig6 , the microphone module is not fully located in its end position in the installed state , and therefore partially protrudes over the housing of the hearing aid device 21 . on the top of the microphone carrier 1 , respectively one test port 23 a - 23 e for contacting a test device is located in the region of the connection cable 16 - 20 on the conductor traces . the correct function of the microphone module can , by this , be tested before the installation in the hearing aid device . defective microphone modules can thus be eliminated early in the production process of the hearing aid device . furthermore , fig6 shows a sound aperture opening 22 in an uncropped shown region of the housing of the hearing aid device 21 . in the installed microphone module , the socket 13 d of the microphone 13 ( not visible from fig6 ; compare fig5 ) protrudes in this sound aperture opening . the sockets 14 d , 15 d of the remaining microphones likewise protrude in corresponding further housing openings of the hearing aid device 21 ( not shown ). the microphone module is thereby fixed in the hearing aid device 21 in a simple manner . fig7 shows the section of the hearing aid device 21 ( corresponding to fig6 ) with the microphone module according to an embodiment of the invention in detail . however , in contrast to fig6 , in the embodiment according to fig7 the microphones as well as the sockets are encased in jackets 24 , 25 and 26 made of elastic , oscillation - damping material , that to some extent even enclose the microphone carrier . the attachment of the microphone module in the hearing aid device 21 and the oscillation - technical decoupling of the microphone module from the housing of the hearing aid device 21 is thereby improved . moreover , damping elements ( not shown ) can likewise be located at further connection points of the microphone carrier 1 with the housing of the hearing aid device 21 . fig8 shows a development of the invention . a plurality of omnidirectional microphones 13 ′, 14 ′ and 15 ′ are thereby arranged on a common microphone carrier 1 ′ and electrically circuited with one another to form a directional microphone system . in this embodiment , the electronic components necessary for electrical circuiting ( for example , delaying elements and inverters ) are advantageously likewise directly mounted on the microphone carrier 1 ′. the components are comprised in the physical unit 27 ′ that is arranged over the microphone 15 ′ on the microphone carrier 1 ′ in the exemplary embodiment . the physical unit 27 ′ can be implemented as an integrated circuit , and thus as an electronic component with it own housing . however , a plurality of electrical components can likewise also be placed in a distributed manner on the microphone carrier 1 ′. the conductor traces for electrical connection of the component 27 ′ are also advantageously located directly on the microphone carrier . a directional microphone system can thus by realized in a simple manner , in that electronic components necessary to fashion the directional microphone system are also comprised by the microphone module . the microphones 13 ′, 14 ′, 15 ′ of the microphone module can then already be calibrated before the microphone module is used in a hearing aid device . the calibration with regard to the transmission behavior of the microphones 13 ′, 14 ′, 15 ′ is particularly necessary when a directional microphone system of higher order should be formed via electrical circuiting . furthermore , the microphone carrier 1 ′ can be provided with further electrical components , where the functionality of the microphone module is , for example , expanded to the effect that a signal preamplification and a / d conversion of the microphone signals also ensues . these components can also be comprised by a single integrated circuit on the microphone carrier . however , a plurality of electrical components can also be mounted on the microphone carrier 1 ′. digital , and thus largely interference - insensitive signals are thus already supplied from the microphone module to the signal outputs . for the purposes of promoting an understanding of the principles of the invention , reference has been made to the preferred embodiments illustrated in the drawings , and specific language has been used to describe these embodiments . however , no limitation of the scope of the invention is intended by this specific language , and the invention should be construed to encompass all embodiments that would normally occur to one of ordinary skill in the art . the particular implementations shown and described herein are illustrative examples of the invention and are not intended to otherwise limit the scope of the invention in any way . for the sake of brevity , conventional electronics and other functional aspects of the systems ( and components of the individual operating components of the systems ) may not be described in detail . furthermore , the connecting lines , or connectors shown in the various figures presented are intended to represent exemplary functional relationships and / or physical or logical couplings between the various elements . it should be noted that many alternative or additional functional relationships , physical connections or logical connections may be present in a practical device . moreover , no item or component is essential to the practice of the invention unless the element is specifically described as “ essential ” or “ critical ”. numerous modifications and adaptations will be readily apparent to those skilled in this art without departing from the spirit and scope of the present invention .