Overview
IEC 61595-2:1997 specifies the requirements for multichannel digital audio tape recorders (DATR), using reel-to-reel systems for professional audio applications, focusing on Format B. This international standard, published by the International Electrotechnical Commission (IEC), applies to the recording and interchange of digital audio programs across 24 to 96 channels on magnetic tape with widths of either 12.7 mm or 25.4 mm, using stationary recording heads. The document details the necessary mechanical and electrical features to ensure compatibility and interoperability of digital audio tapes within professional environments.
Key Topics
- Channel Capacity: Supports 24, 48, or 96 digital audio channels, allowing for scalable multi-track audio recording.
- Tape Specifications: Defines the use of professional-grade magnetic tape with widths of 12.7 mm (commonly used for 24 or 48 channels) and 25.4 mm (for up to 96 channels).
- Mechanical and Electrical Interchangeability: Establishes essential parameters such as tape speed (76.20 cm/s nominal), track assignment, tape winding, and alignment to ensure tapes can be exchanged and reliably played back on compatible professional equipment.
- Data Encoding: Standardizes the use of a 48 kHz sampling frequency for all channels, uniform 16-bit quantization, and digital encoding methods to ensure consistent audio quality and compatibility.
- Track Structure: Defines both main and subtrack allocation for digital audio, time code, cue tracks, reference tracks, and auxiliary data.
- Recording and Playback: Details the requirements for stable recording and reproducible playback of multichannel digital audio signals in professional usage scenarios.
- Error Protection: Refers to the inclusion of error correction protocols and the use of time codes for precise synchronization and integrity of audio data.
Applications
IEC 61595-2:1997 Format B is specifically designed for professional audio recording studios, broadcast facilities, and archival environments that demand reliable, high-capacity multichannel digital audio recording and exchange. Typical applications include:
- Studio Multitrack Recording: Enabling simultaneous capture of numerous audio sources, such as in music production, film scoring, and large ensemble recordings.
- Broadcast Production: Facilitating the interchange of audio programs between different facilities with assured compatibility.
- Archiving: Supporting preservation and migration of valuable audio content by specifying standardized storage formats.
- Post-production: Allowing seamless transfer of audio data for editing, mixing, and mastering across multiple systems and venues.
By specifying exact tape dimensions, recording speeds, and channel structures, the standard enables organizations to future-proof recordings and maintain operational efficiency through clear interoperability guidelines.
Related Standards
IEC 61595-2:1997 is part of a larger family of multichannel DATR standards from the IEC:
- IEC 61595-1: Multichannel digital audio tape recorder (DATR), reel-to-reel system for professional use – Part 1: Format A
- IEC 61595-3: Multichannel digital audio tape recorder (DATR), reel-to-reel system for professional use – Part 3: 24 bit use of 16 bit media
Other normative references relevant to this standard:
- IEC 60461: Time and control code for video tape recorders
- IEC 61120-4: Digital audio tape recorder, reel-to-reel system using 6.3 mm magnetic tape for professional use – Magnetic tape properties
- ITU-T V.41: Code-independent error control system
These related standards collectively promote interoperability, compatibility, and best practices for professional digital audio tape recording and exchange.
Keywords: IEC 61595-2, digital audio tape recorder, DATR, multichannel audio recording, Format B, professional audio, reel-to-reel, magnetic tape, audio interoperability, audio standardization, IEC standards.