IEC 60118-14:1998 pdf download – Hearing aids -Part 14: Specification of a digital interface device

IEC 60118-14:1998 pdf download – Hearing aids -Part 14: Specification of a digital interface device.
This part of IEC 60118 specifies the electrical and mechanical requirements for an interlace 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 restr,cted 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 f or 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 lEG 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 lot 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 En dc,, low-frequency analogue and in digital high-speed data applications — Part 4: Printed board connectors — Seclion 105: Detail specification br 9 mm circular connector with 3 to 8 contacts for use Err a wide range of applications including the telecommunication and audio Industry
5 Physical specifications of the interface
5.1 General
The digital interface device may be physically and electrically sepalate from the control device. If the device is not physically separate, but constructed as a part of the control device, it shall still be constructed so as to meet the requirements for patient safety given in 5.2.
The digital interface device shall be connected to the hearing aid using a cable with connectors at both ends. It ts recommended that the digital interface device provide two independent connectors, to provide for binaural fitting.
5.2 Patient safety
The digital interface device shall comply with IEC 60601-1-1 type BF.
When the digital interface device is integrated with the control device, the entire system shall comply with IEC 60601-1-1, type BF.
5.3 Connection to the control devIce
If the digital interface device is physically and electrically separate, it shall be 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.
lithe digital interface device is constructed as a part of the control device, this standard makes no specifcation 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), AX (receive) and E):
b) the physical connections are fully documented:
C) a convertor for use of a standard ITLJ-T V.24 cable is readily available, either in the general markel 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.
These specifications apply to each of the two connectors that are recommended to support binaural hearing aid fitting.