EN 60118-14-1998 pdf download.Hearing aids Part 14 : Specification of a digital interface.
This part of IEC 60118 specifies the electrical and mechanical requirements for an interface device to allow a general-purpose control device such as a desktop computer to be connected to hearing aids. for the purpose of electrical setting of their operating parameters.
There is no specification of anything within the hearing aid, such as types of parameters and their signal processing characteristics, nor is there any specification of the parameter setting procedure — the method used to determine which settings are most appropriate to the person wearing the hearing aid. This standard is restricted to the digital interface between the control device and the hearing aid.
This standard provides a specification such that all hearing aids which can be programmed by the specified digital interface may have their parameters set by a single control device and interface device.
The specifications of this standard are for use in connection with hearing aids with parameters set by a direct electrical connection using a cable. They do not cover hearing aids with parameters controlled by radio frequency or infrared transmission, or any other “wireless” method of control.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 60118. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 60118 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid normative documents.
IEC 60601-1-1:1992, Medical electrical equipment — Part 1: General requirements for safety — Section 1: Collateral standard: Safety requirements for medical electrical systems.
IEC 60118-12:1996, Hearing aids— Part 12: Dimensions of electrical connector systems. IEC 61076-4-105:1995. Connectors with assessed quality for use in d.c., low-frequency analogue and in digital high-speed data applications — Part 4: Printed board connectors — Section 105. Detail specification for 9 mm circular connector with 3 to 8 contacts for USC in a wide range of applications including the telecom in it n icat ion and audio industry.
ITU-T Recommendation V.24:1996. List of definitions for interchange circuits between data terminal equipment (DTE) and data c.i,.jj 11 -terminal ing equipment (DCE,.
3 Definitions
For the purpose of this part of IEC 60118. the following definitions apply.
3.1
digital interface device
device for exchanging signals between a hearing aid and a control device for the electrical setting of operating parameters
3.2
control device
desktop computer or other programmable device which carries out the procedure for setting the parameters of a hearing aid. The control device is connected to the digital interface device by a serial interface.
3.3
hearing aid
device worn by a person to aid auditory function. Within this standard, the only relevant hearing aids are those which have electrically programmable controls and therefore require setting using a digital interface device and control device.
5.3 Connection to the control device
If the digital interface device is physically and electrically separate, it shall he controlled by a serial connection between the device and the control device, according to ITU-T V.24. The digital interface device shall conform to the specification within the referenced ITU.T V.24 recommendation for a data terminal equipment device. These specifications govern both electrical and mechanical requirements.
If the digital interface device is constructed as a part of the control device, this standard makes no specification for the interconnection between the interface device and the control device.
If the digital interface device is constructed as a physically separate entity, the connector for the cable to the control device may vary from the mechanical requirements of ITU-T V.24, provided that
a) the minimum electrical requirements are met (two data lines plus earth, conventionally referred to as TX (transmit), RX (receive) and E); b) the physical connections are fully documented; C) a convertor for use of a standard ITU-T V.24 cable is readily available, either in the general market or from the interface device manufacturer.
5.4 Connection to the hearing aid
The specifications of the connection of the digital interface device to the hearing aid is given in the following subclauses.EN 60118-14-1998 pdf download.

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