What is this BS 7486-1 - 625-line -50 field system FM audio recording about?
BS 7486-1 discusses specifications for helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type beta format and FM audio recording with a focus on 625 line-50 field systems.
BS 7486-1 is the first part of the BS 7486 multi-series on helical-scan videotape cassette system that is applicable to frequency modulation (FM) audio recording on video recorders fully compatible with the beta format for 625 lines-50 field television systems defined in IEC 767.
The requirements given relate to 625 lines-50 field systems.
Who is BS 7486-1 - 625-line -50 field system FM audio recording for?
BS 7486-1 on helical-scan videotape cassette system is useful for:
- Audio equipment manufactures
- Audio programmers
- Music producers
- Sound technicians
- Recording and dubbing studios
- Regulatory bodies
Why should you use BS 7486-1 - 625-line -50 field system FM audio recording?
The method of recording the audio signal using frequency modulation is specified. The audio signal is recorded in the deep layer of the magnetic tape in the video track area prior to the video recording, with additional audio heads mounted on the common video rotating drum.
BS 7486-1 discusses the recording method, mechanical configuration, recording characteristics, channel application, encoder transient measurement method, track pattern of beta for FM audio
system (625 lines-50 field), and video and FM audio signal spectrum (625 line-50 field). Overall, BS 7486-1 defines the electrical and mechanical characteristics of FM audio recording which will provide for the interchangeability of recorded cassettes.
