6 and 7 is installed in theelectronic module 12, and this electronic module is outstanding a little from panel 9.Preferably,electronic module 12 also comprises the signal processing circuit that is necessary, except output transducer 13.Output transducer 13 is placed the hearing aids shell separately, and is connected toelectronic module 12 by flexible conductor 14.Sound sends bytransducer delivery channel 15 fromoutput transducer 13, and the terminal oftransducer delivery channel 15 is thetransducer outlet connectors 16 in thediapire 17 ofhollow shield part 10, andhollow shield part 10 is towards the inside of duct.

In the embodiment of Fig. 2,electronic module 12 also comprises additional microphone 8.Additional microphone 8 is placed on a part ofelectronic module 12, this portions ofelectronics module 12 and panel separates and not towards the outside.That is to say that described additional microphone comprises an electronic unit, this electronic unit is positioned on a part ofelectronic module 12, in its hearing aids 1 after assembling towards the hole of the inside of hearing aids 1.In the embodiment shown, the hearing aids shell comprisespassage 18, theadditional microphone 8 of theinlet 20 ofpassage 18 from the surface ofshield part 10 in shell.Make effective sound holes of described additional microphone be positioned at the guard shield surface thus, and the electronic unit of described additional microphone is arranged in electronic module.

Passage 18 is preferably integrally formed with the shield part of hearing aids shell.

In the manufacture method, set up the computer model of duct.In the optimizing process of interaction, the operator selects the optimum position and the direction of electronic module and definite electronic module, and the position of the guard shield in the duct and direction.Guard shield is replicated adjustment subsequently, with the side of contact portion duct.But the outside of guard shield does not contact duct.Which part of decision contacts duct and is established to outer shield line of demarcation partly is the part of customization procedure.

Because hearing aids 1shellShield part 10 is indivedual manufacturings, just theinlet 20 ofpassage 18 just might be placed outside the line ofdemarcation 22, and its mode makes when hearing aids is inserted into wearing position in theduct 11, enters themouth 20 just to expose in theshield part 10 of shell.Therefore realized that theinlet 20 ofpassage 18 is placed in place dark as far as possible in the ear, andauditory canal wall 11a does not block inlet 20.Above-mentioned line of demarcation partly separates contact portion and non-contacting guard shield, and it is represented with chain-dottedline 22 in Fig. 2.By shell and hearing aids user's head and cooperating of auricle, the recessed position ofinlet 20 has just realized avoiding being directly exposed in the wind.Theinlet 20 that forms outer microphone aperture is preferably open, as shown in Figure 2.

The other end ofpassage 18 be theoutlet 21, theoutlet 21 in hearing aids residing position corresponding to the position of additional microphone 8.Becauseadditional microphone 8 is placed on theelectronic module 12, so it has with respect to thepanel 9 good positions that limit.This allowpassage 18 be able in the computer-aided manufacture process of individuation can with

Shield part 10 forms integral body.

Therefore, by usingShield part 10 just might enter themouth 20 andoutlet 21 position and placedchannel 18 best with respect to it.That is to say, allow in theinlet 20 indentations as far as possible recessed in other words ear, the wind that shows in the case influence minimum, and will export 21 and be arranged to sound is sent in theadditional microphone 8---this microphone is placed on theelectronic module 12, does not just need to draw extra electric wire.In a preferred embodiment, theinlet 20 of microphone is open.Opening this inlet has just reduced by any crosswind and has sent into noise in the passage.

Though the present invention only is described above specifically to be implemented in inner ear type and the post-aural hearing aid, but one skilled in the art will realize that also can be at CIC (CIC=completely in the canal, fully in the duct) additional microphone is set in the hearing aids, this additional microphone is positioned at shell and a passage that leads to it is arranged.

Obviously, themicrophone 8 from indentation only can obtain seldom useful directional information.Therefore when detecting wind noise or when saturated, only being directly switch toadditional microphone 8, just will inevitably sacrifice of directional information.But most of noise energy of the noise that produces from wind is a low frequency.Therefore, in one embodiment, use high-pass filtering to extract high-frequency information, and use the low frequency information that low-pass filtering extracts not to be had from the wind noise ofadditional microphone 8 frommain microphone 6 and 7.These can be by several modes, for example by inserting fixing high pass and low pass filter when saturated or realize by taking over seamlessly detecting.So just can suppress to come the wind noise of

autonomous microphone

6 and 7, keep direction and sensitivity at least to a certain degree simultaneously.In other embodiments, can make up or balance, select according to weight coefficient from the signal of each corresponding microphone according to essential condition.

The type that depends on hearing aids has various standards to the detection of wind noise.A kind of is from the signal ofadditional microphone 8 and come to carry out low frequency relatively between the signal ofautonomous microphone 6 and 7.Another kind is detect analog/digital converter saturated.In the wind noise situation, can detect switching rate (slew rate) usually, because signal can switch to full negative-going signal erratically from full forward signal, vice versa.Another standard can be to detect the low frequency part of the signal of autonomous microphone whether to exceed predetermined threshold value.Also having a standard can be the uncorrelated noise level that exceeds predetermined threshold in the dual microphone parts of a shotgun microphone.

Because the signal energy of most of wind noise is a low frequency, to have different cut-off frequencies be favourable so that additional microphone andmain microphone 6 are compared with 7,

main microphone

6 and 7 preferably matches each other itself.This make the additional microphone can be much more late saturated more than main microphone, even they are exposed in the same noise.

Claims

1. a hearing aids (1) comprising: shell (2), and it has concave surface (4), with after being fit to it and being worn on user's ear; At least the first microphone (6,7) is used to receive background sound; Processing unit is used for handling the signal from described first microphone (6,7); And output transducer, it is characterized in that: the position in the described concave part (4) of described hearing aids shell (2), be provided with at least one additional microphone (8) and be used for receiving the background sound that will be amplified by described hearing aids (1), between the normal operating period of described hearing aids (1), described position has shielded the influence of wind.

2. hearing aids according to claim 1 is characterized in that: the low cut-off frequency of described additional microphone (8) is significantly higher than the low cut-off frequency of described at least one first microphone (6,7).

3. hearing aids according to claim 2 is characterized in that: the cut-off frequency of described additional microphone (8) is higher than about 1kHz.

4. according to the described hearing aids of aforementioned arbitrary claim, it is characterized in that: described processing unit is fit to detect the saturated of amplifying circuit, and is detecting described at least one first microphone of forbidding under the saturated situation.

5. method of obtaining in hearing aids (1) with processing audio signal, this hearing aids have concave surface (4) with after being fit to it and being worn on user's ear, and described method comprises:

Obtain first voice signal by first microphone aperture that is placed on the primary importance place in the described hearing aids, described first microphone aperture is selected for reproduces sound well under the condition that is not exposed in the wind;

Second microphone aperture by the second place place on the described concave surface (4) that is placed on described hearing aids is obtained second sound signal, thereby between the normal operating period, described second microphone aperture to small part avoids direct storm and reveals;

Detect described first microphone (6,7) and described second microphone (8) rank of one of them noise that picks up at least;

Be chosen under the condition that is not exposed in the wind the main signal of handling from described first microphone (6,7); And

Be chosen under the condition that is exposed in the wind, the main signal of handling from described second microphone (8), described selection is based on other described detection of level of noise.

6. method according to claim 5, it comprises described first microphone (6,7) is chosen as shotgun microphone.

7. method according to claim 5, it comprises described second microphone is chosen as the low frequency microphone of the first microphone sensitivity as described not.