IEC 62503:2008 PDF

Name: IEC 62503:2008 — Multimedia quality - Method of assessment of synchronization of audio and video
SKU: IEC 62503:2008
Price: 35 EUR
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Multimedia quality - Method of assessment of synchronization of audio and video

Название (английский):

IEC 62503:2008

Multimedia quality - Method of assessment of synchronization of audio and video

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 12
Дата публикации:: 8 сентября 2008 г.
Издание:: IEC IS 62503 edition 1 version 1
ICS:: 01

Тип поставки:

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Описание (английский):

IEC 62503:2008 provides a subjective (or perceptible) and statistical method of assessment of overall, or end-to-end, difference of delays between real world and reproduced scenes in terms of video and accompanying audio recoded in a medium.

Abstract

Overview

Key Topics

Scope and purpose
- Provides a perceptual method to evaluate audio‑video synchronization (lip sync) for consumer multimedia reproduction (excludes professional broadcast).
- Does not prescribe pass/fail limits; it standardizes the assessment method and reporting.
Terms and definitions
- Key terms include lip sync, test video clip, test video sequence, subject, and outlier.
Test material preparation
- Use short clips (typically 10–20 s) such as bust shots of a speaker; audio channel serves as the timing reference.
- Create a randomized test sequence where audio is time‑shifted relative to video (both audio lead and audio lag), with padding as needed.
- Label clips with title frames to identify sequence numbers and preserve audio‑video sync on storage (e.g., CD‑ROM).
- Recommended time‑shift increment (ΔT): 10 ms for fine resolution.
Subjective assessment procedure
- Minimum 15 untrained subjects (general public) rate each clip under controlled listening and viewing conditions.
- Use a five‑grade impairment scale (from “Imperceptible” to “Very annoying”), aligned with ITU‑R BT.500‑11 guidance.
Data processing and analysis
- Remove outliers, compute subjective opinion scores and statistical estimates, and report normalized impairment responses and estimated synchronization offsets.

Applications

Evaluating consumer devices and playback systems (TVs, set‑top boxes, media players) for audio‑video synchronization perceived by end users.
Quality assurance and user‑experience testing for streaming services, multimedia players, mobile devices, and consumer electronics.
Human‑factors research into perceptual thresholds for audio leading or lagging video (lip‑sync tolerance).
Supporting product specifications, interoperability testing, and comparative studies of codecs and rendering pipelines.

Who should use it

QA engineers and test labs, AV system integrators, device and codec manufacturers, multimedia researchers, and standards developers seeking a repeatable subjective method to quantify lip‑sync impairment.

Related standards

ITU‑R BT.500‑11 (Methodology for subjective assessment of TV picture quality)
ITU‑R BT.1359‑1 and BT.1377 (related AV synchronization recommendations)
ISO/IEC 13818‑1 (MPEG timestamps referenced for synchronization schemes)

Keywords: IEC 62503, lip sync, audio‑video synchronization, AV synchronization, multimedia quality, subjective assessment, test video clips, time‑shifted audio.

Технические детали

Технический комитет: TA 20 - Analogue and digital audio
SKU: IEC 62503:2008

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