IEC 61603-7:2003 PDF

Name: IEC 61603-7:2003 — Transmission systems of audio and/or video and related signals using infra-red radiation - Part 7: Digital audio signals for conference and similar applications
SKU: IEC 61603-7:2003
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Transmission systems of audio and/or video and related signals using infra-red radiation - Part 7: Digital audio signals for conference and similar applications

Название (английский):

IEC 61603-7:2003

Transmission systems of audio and/or video and related signals using infra-red radiation - Part 7: Digital audio signals for conference and similar applications

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 26
Дата публикации:: 22 мая 2003 г.
Издание:: IEC IS 61603 edition 1 version 1
ICS:: 33.040.20

Тип поставки:

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Язык документа:

ruen

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Цена:390 €

Описание (английский):

describes the characteristics of a digital multiple channel, multiple carrier audio transmission system as an extension to conference interpretation or similar systems using the frequency ranges 45 kHz to 1 MHz and 2 MHz to 6 MHz.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

IEC 61603-7:2003 specifies a digital, multi-channel, multi-carrier audio transmission protocol using infrared (IR) radiation as an extension to conference interpretation and similar systems. The standard defines the physical and data-link layers for infrared audio links operating primarily in the 2 MHz–6 MHz band (primary) and optionally in 45 kHz–1 MHz (secondary). It covers optical characteristics (peak wavelength ~875 nm ± 25 nm), sub-carrier allocation, modulation, filtering and the framing/protocol structure required for reliable digital audio and associated data in conference environments.

Key topics and technical requirements

Frequency bands and sub-carriers: Primary band 2–6 MHz with six sub-carrier centre frequencies (e.g., ~2333.333 kHz, 3000 kHz, 3666.667 kHz, 4333.333 kHz, 5000 kHz, 5666.667 kHz). Secondary band 45 kHz–1 MHz is noted for consideration.

Physical layer (Layer 1): IR medium compliant with IEC 61920 and IEC 61603-1; optical peak intensity at ~875 nm.

Modulation: Differential Quadrature Phase Shift Keying ((D)QPSK) for sub-carrier modulation, with defined constellation and differential decoding rules.

Filtering: Square-root raised cosine (SRRC) transmit/receive filters yielding a raised-cosine overall response; roll-off factor β = 0.4 used for occupied bandwidth calculations.

Bandwidth calculation: Occupied bandwidth is a function of symbol/bit rate and roll-off factor (standard provides the bandwidth relationship).

Data-link and protocol: Layer 2 defines framing (superframes, RS frames), audio block structures, CRC checks, data messages, packet segmentation and protocol messages (configuration, display, etc.).

Audio encoding elements: Sub-band Adaptive Pulse Code Modulation (APCM) encoder concepts, audio quality modes (MQ/HQ/MONO variants), and bit-pool/sample structures are defined to map audio channels to carriers.

Robustness features: Frame structures and CRC/forward-error measures specified to support reliable conference audio and ancillary data.

Applications and who uses this standard

Primary applications

Conference interpretation systems (multilingual audio distribution)
Wireless IR assistive listening in meetings, courtrooms, auditoria
Multi-channel audio distribution in secure/closed venues where RF is unsuitable

Who should consult IEC 61603-7

AV system designers and integrators specifying IR audio links
Hardware manufacturers of IR transmitters/receivers and codec modules
Test laboratories and compliance engineers validating IR audio equipment
Facility managers and specification authors for conference facilities

Related standards

IEC 61603-1: Transmission of audio/video signals using infrared radiation - General

IEC 61603-3: Transmission systems for audio signals for conference and similar systems

IEC 61920: Infrared transmission systems - Free air applications

ISO/IEC 7498-1: OSI Basic Reference Model (context for layer mapping)

By defining modulation (DQPSK), filtering (SRRC β=0.4), sub-carrier allocation and the Layer‑2 protocol for audio/data framing, IEC 61603-7 enables interoperable, reliable digital infrared audio systems for conference and similar applications. Keywords: IEC 61603-7, infrared audio transmission, conference interpretation, DQPSK, SRRC, multi-channel IR.

IEC 61603-7:2003 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses this standard

Related standards

Технические детали

IEC 61920:2004

Infrared free air applications

IEC 61603-1:1997

Transmission of audio and/or video and related signals using infra-red radiation - Part 1: General

IEC 61603-3:1997

Transmission of audio and/or video and related signals using infra-red radiation - Part 3: Transmission syste…

ISO/IEC 7498-1:1994

Information technology — Open Systems Interconnection — Basic Reference Model: The Basic Model