Abstract:
Hearing aid fitted with a central processing unit ( 1 ) having peripherals ( 3 E,  3 A) connected to its input and output respectively. Each peripheral includes an identification unit ( 5 ) having an the output connected to a first input of a comparator ( 9 ). A second input of the comparator is connected to a read-only identification memory ( 11 ) containing identification features of the peripherals. An output of the comparator drives a configuration memory ( 15 ). As a result, the hearing aid self-identifies its current configuration based on the identification of the peripherals.

Description:
CROSS REFERENCED TO RELATED APPLICATION  
       [0001]     The present application is a Continuation of U.S. application Ser. No. 09/610,284, filed Jul. 6, 2000, which is a Continuation of International Application No. PCT/CH98/00502, which has an international filing date of Nov. 24, 1998. 
     
    
     BACKGROUND OF THE INVENTION  
       [0002]     The present invention relates to a hearing aid defined in the preamble of claim  1  and to a method, defined in the preamble of claim  9 , for manufacturing a hearing aid.  
         [0003]     Hearing aids are exceedingly complex systems. To meet a user&#39;s particular needs, a large number of different variations of hardware configurations must be made available. As a result manufacture, marketing and hearing-aid fitting incur very high costs, for instance manufacture requires setting up numerous different hearing-aid configurations which must be appropriately labeled and monitored and marketing requires commensurate stocking, while hearing-aid fitting must match the user&#39;s particular needs and different procedures are required depending on the particular hearing-aid configurations.  
       BRIEF SUMMARY OF THE INVENTION  
       [0004]     Starting with a hearing aid of the above cited kind, it is the objective of the present invention to solve this problem. For that purpose, at least some of the peripherals shall comprise an identifying unit of which the output is connected to the input of a comparator. An identification memory is connected to the input of said comparator. At its output, the comparator drives a configuration memory.  
         [0005]     Because at least some, preferably all peripherals identify themselves and because the comparator—on the basis of the incoming identifications from the peripherals and following comparison with several possibilities of connecting such peripherals—shall store such a particular hardware configuration, the following significant advantages are attained:  
         [0006]     Once assembled, the hearing aid is self-identifying in that by means of the comparator it has ascertained its configuration in terms of peripherals.  
         [0007]     Because this self-identification requiring no writing—for instance on the packaging circumvents sources of errors in production quality controls, in marketing and fitting the hearing aids, it being impossible to test, deliver or fit a hearing aid that would be of another peripheral configuration.  
         [0008]     In a preferred embodiment of the present invention, the comparator output is connected to an operationally selective input at the signal processing unit. As a result only such processing is feasible at the signal processing unit—whether for operational purposes per se or already for implementation—which also are admissible for the actual system constellation at hand. Operational programs which for instance must be implemented in wireless manner can be tested in this way for the admissibility of the predominant system constellation.  
         [0009]     A further preferred embodiment of the hearing aid of the invention sets up the connection between peripherals and the central signal processor by means of a bus and interfaces. It is clear that in a conventional hearing aid the central digital processing unit must be connected hardware to hardware to the particular peripherals. The more options there are regarding the peripherals, the more connections must be provided for the central processing unit. This number increasingly affects the required chip area of the cited signal processing unit, and this feature is exceedingly disadvantageous in the desired miniaturization of hearing aids. Because the cited connections take place through a bus and interfaces, it is feasible to minimize the number of those hardware connections which are used in the hardware configuration of the state of the art, and the signals applied to said connections can be recognized and interpreted in configuration-specific manner by the signal processing unit. Applicable peripherals include microphones etc, sensors in general, loudspeakers etc., actuators in general, transceivers, i.e. wireless transmitters and/or receivers, manually operated selection switches, loudspeaker volume controls (potentiometers), read-only memories for instance processing parameters for the signal processing unit, read/write memories for instance for processing protocols, etc.  
         [0010]     These peripherals can be generically divided into a first category of audio signal components such as sensors, actuators, amplifiers, filters and into a second category of control components such as transceivers, selection switches, memories etc.  
         [0011]     Preferably a first bus with first interfaces is used for the first category and a second bus with second interfaces is used for the second category. In a further preferred mode, the first interfaces are designed as at least three-wire interfaces, the second interfaces are designed as at least two-wire interfaces. Appropriate interfaces on one hand are I 2 S as three-wire interfaces and I 2 C as two-wire interfaces, both marketed by Philips.  
         [0012]     In principle however the hookup of signal-processing-unit/bus/peripherals also can be implemented by means of other interfaces, for instance AES-3 interfaces from the Audio Engineering Society and/or SPI Motorola interfaces.  
         [0013]     The actual configuration also determines which signals are being transmitted to the central processing unit and hence which parameters. If peripheral identification is automated at the hearing aid of the invention, it will also be possible to automatically activate those signal processing configurations from a plurality of such which do correspond to the prevailing configuration with peripherals, or to drive them externally for instance using a transceiver, that is in wireless manner. As a result the problem of hearing-aid signal processing which does not at all correspond to the present configuration including peripherals shall be eliminated.  
         [0014]     In a further preferred embodiment, the hearing aid of the invention comprises an output connected to the configuration memory at the hearing aid. In this way it is feasible—when hooking up the hearing aid to a computer-assisted fitting apparatus—that the hearing aid in its present configuration shall call up said apparatus and identify itself, whereby errors caused by erroneous hearing-aid assumptions shall be excluded. This communication as well may be wireless in that the cited output is provided by a transceiver.  
         [0015]     A method of the invention for manufacturing a hearing aid is defined by the features of claim  10 . Further preferred implementations of the manufacturing method of the invention are specified in the further claims. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0016]     The invention is elucidated below in relation to the attached drawings.  
         [0017]      FIG. 1  is a signal-flow/functional-block diagram showing the basic principle of the hearing aid of the invention,  
         [0018]      FIG. 2  shows a preferred design of the hearing aid of the invention, and  
         [0019]      FIG. 3  shows a preferred embodiment of the invention&#39;s hearing aid designed as in  FIG. 2 .  
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0020]     As shown in  FIG. 1 , a hearing aid of the invention comprises a central digital signal processing unit  1  having signal inputs E and signal outputs A. Peripherals  3   E  and  3   A  are connected to the signal inputs and outputs E and A. The peripherals  3   E  for instance may be sensors such as microphones, more generally acoustic/electric transducers, or control units such as a remote control with transceiver, program switches, a loudspeaker volume adjustment etc. As regards the peripheral  3   A , in particular actuators may be involved such as one or several electric/mechanical or electric/electric output transducers.  
         [0021]     As shown in  FIG. 1 , at least one peripheral  3   E  is provided at the input side and at least one peripheral  3   A  at the output side of the signal processing unit  1 . Digital and/or analogue inputs with subsequent analog/digital converters (omitted) are present at the central processing unit in relation to the signals transmitted by the peripherals  3   E . In similar manner digital outputs and/or analogue outputs preceded by digital/analog converters are present at the output side of said unit  1  in relation to the signals processed by the peripheral  3   A .  
         [0022]     Each of the minimum of two peripherals  3  comprises an identification memory  5 . The information stored in the identification memories  5  is highly specific to the kind of peripheral involved, for instance the kind of microphone, remote control etc.  
         [0023]     Following hardware configuration of the hearing aid, an identification cycle begins. Therein, and as schematically indicated by the cycle unit  7 , illustratively all identification memories  5  are searched sequentially and an appropriate determination is made that no peripherals are hooked up to the dummy connection  5   r . The unit  7  feeds the memory contents of the identification memories  5  to a comparator  9 . All peripherals appropriate for the signal processing unit  1  together with their pertinent identifications are entered in a read-only memory  11 .  
         [0024]     To make sure that the signal processing unit  1  and the read-only memory  11  also correspond to each other in the sense that the memory  11  in fact does contain identification features of peripherals which also match the particular signal processing unit  1 , the first step in identification may be in comparing an identification entry stored in an identification memory  5   1  of the signal processing unit  1  through the cycle unit  7  and the comparator  9  with the contents deposited at the read-only memory  11  in its own identification memory  5   11 , and identifying this memory or contents.  
         [0025]     As schematically indicated by the circulating unit  13 , a sequential determination takes place at the comparator  9 , by means of the entries in the identification memories  5  which of the kinds of peripherals  3  previously stored in the read-only memory  11  are at all present in the hearing-aid under consideration, and which are not. If there is a model X signal processing unit  1 , and peripherals of types M and N are called for, then the output of the comparator stores the hearing aid configuration X, M, N in a hearing-aid configuration memory  15 , and, as shown in relation to the read-only memory  11 , further peripherals of types A, B etc. might be combined with the called-for X model signal processing unit  1 .  
         [0026]     The output of the configuration memory  15  drives the signal processing unit  1 . In the light of the present hardware configuration as shown by the switch  17  in  FIG. 1 , a specific processing mode is activated at the signal processing unit  1 , corresponding to S MN , or is enabled. If the software of the processing mode has not yet been loaded into the signal processing unit  1 , then, on account of the detected configuration in the configuration memory  15 , the loading of processing modes software can be blocked when such modes are outside the called-for hearing-aid hardware configuration. If, as shown schematically in  FIG. 1 , a transceiver  30  is used, by means of which the signal processing unit  1  is loaded in wireless manner with the desired processing program, then, as diagrammatically shown at the switch  17   a,  implementation using the transceiver  30  shall be precluded if the implementation is tried for a processing mode other than for the X, M, N configuration.  
         [0027]     The output of the configuration memory  15  preferably is connected to an output HG A  of the hearing aid. When fitting the hearing aid to the patient, said output is fed to the PC supported fitting unit  19  whereby the hearing aid is identified by its individual configuration at the fitting unit  19 . As shown in dashed lines, and in a preferred embodiment, the said output HG A  can be implemented by the transceiver (HG′ A ). Basically a transceiver  30  is needed and most advantageous, even mandatory for binaural signal processing. In such a design the two signal processing units  1  are able to communicate with each other, or, in preferred manner, binaural signal processing may be carried out in a common unit  1 .  
         [0028]     In a further preferred embodiment shown in  FIG. 2 , the communication between a central processing unit  1  and peripherals  3 , further with the read-only memory  11 , for instance an EEPROM, and, as regards hearing-aid fitting, with an external fitting apparatus, can be basically implemented using a bus  21  and interfaces of the cited units. Preferably standard interfaces shall be used (omitted)in particular simple ones, and especially having only two- or three-signal lines such as and preferably I 2 C and I 2 S interfaces such as are presently marketed by Philips, or AES-3 interfaces (Audio-Engineering Society) or SPI interfaces (Motorola).  
         [0029]     As further shown in  FIG. 2 , a two-way communications link is in place at least partly and by means of a bus  21  between the peripherals  3  and the central signal processing unit  1 , whereby further specific values such as further configuration parameters, optional and/or revised data can be transmitted jointly with the component identification shown in  FIG. 1  from the peripherals to the central processing unit, and from the central signal processing unit  1 , data can be sent back to the peripherals. Preferably and as shown in  FIG. 2 , the central signal processing unit  1  includes a signal processing component la as well as controller component lb which through the bus  21  controls and monitors the identification of configuration.  
         [0030]      FIG. 3  shows a preferred embodiment of the principle disclosed in  FIG. 2 . The peripherals basically are divided into audio-signal units or components  3   AU  and control units or components  3   S  and, depending on type, are treated as audio-signal components or pure control components or, in this respect, in a hybrid constellation. The audio components  3   AU  are connected through a first bus  21   AU  and (omitted) corresponding interfaces to the signal processing component  1   a  of the signal processing unit  1 , whereas the control components  3   S  are connected through a second bus  21   S  to the control component  1   b  of the signal processing unit  1 , again by means of corresponding interfaces. Preferably interfaces of different specifications are used for the connection between the audio components  3   AU , the bus  21   AU  and the signal processing component  1   a  than for the connection between the control components  3   S , the bus  21   S  are and for the controller component  1   b.    
         [0031]     Preferably three-wire interfaces preferably based on the I 2 S interfaces cited above are used for the former connection.  
         [0032]     As regards the latter connection, namely the real control connection, preferably two-wire interfaces are used, in particularly preferably based on the above cited kind of I 2 C interfaces.  
         [0033]     As shown in dashed lines, hybrid peripherals participating in the audio signal processing and being controlled and vice-versa, are each connected to the correspondingly preferred audio signal interfaces or control interfaces, additionally also to the second of the buses provided.  
         [0034]     The module of the invention offers a real “plug and play” modular system for hearing aids allowing sharply lowering manufacturing costs, minimizing the connection configuration at the central signal processing unit and in particular substantially precluding erroneous packaging, erroneous configurations, mismatching etc. based on human inattentiveness.