IEC 914:1988 pdf download.NORME INTERNATIONALE INTERNATIONAL STANDARD.
IEC 914 applies to conference systems and to the parts of which they are composed or which arc used as auxiliaries to such systems (headphones, microphones, amplification equipment).
It describes the difterent types of conferencc systems with both wired and wireless systcms, and specifics the basic electrical rcquircmcnts of audio equipment for conference systems.
2. Object
The purpose of IEC 914 is to prescribe the minimum requirements for conference systems in order to ensure interchangeability and optimum performance under conditions of normal operation.
IEC 914 should facilitate the determination of quality of conference systems, the comparison of different systems and the determination of their proper application by listing the characteristics which are useful for their specification.
In IEC 914, the word “quality” is intended to denote mainly electro-acoustical quality such as intelligibility and freedom from interference, and not the quality from the point of view
94: Magnetic tape sound recording and reproducing systems.
268: Sound system equipment.
268-3 (1969): Part 3: Sound systcm amplifiers.
268-4 (1972): Part 4: Microphones.
268-7 (1984): Part 7: Headphones and headsets.
268-11(1987): Part 11: Application of connectors for the interconnection of sound system components.
268-12 (1987): Part 12: Application of conncctors for broadcast and similar use.
268-15 (1987): Part 15: Preferred matching values for the interconnection of sound system components.
417 (1973): Graphical symbols for use on equipment. index, survey and compilation of the single sheets.
574: Audiovisual, video and television equipment and systems.
— Conference intcrprctation system (CIS) (Sub-clause 10.3). Language distribution system (LDS) (Sub-clause 10.4).
Conference voting system (CVS) (Sub-clause 10.5).
10.1 General
Three different types of installations can be recognized:
a) Permanent installations:
in permanent installations the furniture and cabling are fixed and the system components integrated.
b) Semi-permanent installations:
in semi-pcrmancnt installations the furniture is portable or fixed, the cabling is fixed and the system components are either integrated into the furniture or placed on tables.
c) Portable installations:
in portable systems all system components, including babics, are pluggahie and removable.
— Conference intcrprctation system (CIS) (Sub-clause 10.3). Language distribution system (LDS) (Sub-clause 10.4).
Conference voting system (CVS) (Sub-clause 10.5).
10.1 General
Three different types of installations can be recognized:
a) Permanent installations:
in permanent installations the furniture and cabling are fixed and the system components integrated.
b) Semi-permanent installations:
in semi-pcrmancnt installations the furniture is portable or fixed, the cabling is fixed and the system components are either integrated into the furniture or placed on tables.
c) Portable installations:
in portable systems all system components, including babics, are pluggahie and removable.IEC-914-1988