IEC 61595-3:1999

Name: IEC 61595-3:1999 — Multichannel digital audio tape recorder (DATR), reel-to-reel system, for professional use - Part 3: 24-bit operation for 16-bit media
SKU: IEC 61595-3:1999
Price: 23.25 EUR
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Multichannel digital audio tape recorder (DATR), reel-to-reel system, for professional use - Part 3: 24-bit operation for 16-bit media

Название (английский):

IEC 61595-3:1999

Multichannel digital audio tape recorder (DATR), reel-to-reel system, for professional use - Part 3: 24-bit operation for 16-bit media

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 23 июля 1999 г.
Издание:: IEC IS 61595 edition 1 version 1
ICS:: 33.160.30

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Описание (английский):

Digital multirack tapes, with their enormous data storage capacity, are an ideal medium for storing digital audio data with words wider than 16 bits. The method described herein is also applicable to any other medium with minimum of two tracks.

Abstract

IEC 61595-3:1999 – Multichannel Digital Audio Tape Recorder (DATR) 24-bit Operation for 16-bit Media

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Стандарты, упомянутые в описании

Overview

IEC 61595-3:1999 is an international standard developed by the International Electrotechnical Commission (IEC) that addresses the operation of multichannel digital audio tape recorders (DATR) in professional settings. Specifically, it defines the methodology for recording 24-bit audio data words on 16-bit media tracks using reel-to-reel, multitrack digital tape systems.

This standard emerged in response to evolving market needs for higher resolution audio storage driven by analog-to-digital converters (ADCs) and digital mixing consoles that exceed 16-bit resolution. The standard enables legacy 16-bit media to store 24-bit audio signals by distributing data across paired tracks, ensuring backward compatibility with existing equipment.

Key Topics

Scope and Purpose The standard applies to digital audio recording systems using pairs of 16-bit tracks to carry 24-bit audio data words on reel-to-reel tape. It is suitable for multichannel digital tape recorders with at least two tracks and caters to professional audio applications requiring higher bit-depth storage without changing the physical media.
Data Recording Structure Each 24-bit word is split between two tracks labeled "A" and "B":
- Track “A” contains the 16 most significant bits (MSBs).
- Track “B” holds the 8 least significant bits (LSBs) in the lower portion of the 16-bit word; the upper 8 bits of track "B" are filled with zeros.

This bit allocation allows for extended word length storage while using existing 16-bit tracks.

Track Definitions and Channel Mapping Given a format recording N parallel tracks corresponding to N input channels, a 24-bit recording reduces data channels to N/2 since each 24-bit channel occupies two tracks.
- Physical tracks 1 to N/2 are designated as "A" tracks.
- Tracks (N/2 + 1) to N serve as "B" tracks.

For example, audio channel 2 writes its MSBs to track 2 (“A”) and LSBs to track (N/2 + 2) (“B”).

Compatibility and Pre-Emphasis Tapes recorded with 24-bit data remain fully compatible with existing 16-bit systems. Unmodified equipment reading only “A” tracks produces standard 16-bit output, with additional bits on “B” tracks producing a low-level signal (~ –50 dB) negligible to the original audio. Pre-emphasis (signal enhancement before recording) and sampling rate information are carried within the Sync/Control word on track “A”.

Applications

Professional Audio Recording This standard facilitates high-resolution audio capture and storage in studios using DATR reel-to-reel tape systems without immediate need for new 24-bit specific media.
Broadcast and Mastering Enables improved dynamic range and signal fidelity in broadcast chains and audio mastering studios, leveraging existing tape infrastructure.
Legacy Media Integration Allows audio engineers to maximize the value of legacy 16-bit tape media hardware while adopting higher bit-depth digital workflows.
Multitrack Digital Tape Recorders Multichannel setups benefit from this approach by doubling the effective bit depth per audio channel without increasing tape track width.

Related Standards

IEC 61120 Series IEC 61120-1:1991 – General multichannel digital audio tape recorder system requirements. IEC 61120-2:1991 – Format A specification. IEC 61120-3:1991 – Format B specification.
IEC 60958:1989 International standard detailing digital audio interface format, applicable in digital audio transport and interoperability contexts.
IEC 60050 / IEC 60027 / IEC 60417 / IEC 60617 These standards provide underpinning terminology, letter symbols, graphical symbols for electrotechnical vocabulary, and schematics used broadly in digital audio equipment standardization.

Keywords: IEC 61595-3, multichannel digital audio tape recorder, DATR, 24-bit audio recording, 16-bit media, reel-to-reel system, professional audio standards, digital multitrack tape, audio data storage, bit-depth extension, audio signal resolution, audio engineering standards, IEC standards for audio recording.

This standard defines a practical, backward-compatible method to enable enhanced audio fidelity on existing tape-based professional recording equipment, supporting the transition to higher resolution digital audio in mixing, mastering, and archiving environments.

Технические детали

Технический комитет: TC 100 - Audio, video and multimedia systems and equipment
SKU: IEC 61595-3:1999

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