BS EN 60774-2:2000

1 Scope
2 Normative references
3 Recording method
4 Mechanical configuration
      4.1 FM audio track pattern
      4.2 Head azimuth angles
      4.3 Recording time difference
5 Recording characteristics
      5.1 Noise reduction
      5.2 Pre-emphasis
      5.3 Carrier center frequency
      5.4 Frequency deviation
      5.5 Modulation polarity
      5.6 Recording level
6 Other subjects (channel application)
Figure 1 - Track arrangement
Figure 2 - Pre-emphasis frequency response
Figure 3 - Signal spectrum
Figure 4 - Block diagram of FM audio recording
Figure 5 - Block diagram of noise reduction system
Figure A.1 - Encoder transient measurement method
Table 1 - FM audio track dimensions
Table 2 - Head azimuth angles
Table 3 - Carrier center frequencies
Table 4 - Channel applications
Annex A (normative) Encoder transient measurement method
Annex ZA (normative) Normative references to international
                     publications with their corresponding
                     European publications

Applies to frequency modulation (FM) audion recording fully compatible with the VHS system given in IEC 60774-1. It defines the electrical and mechanical characteristics of FM audio recording which will provide for the interchangeability of recorded cassettes.

minimum 2,0 mm; minimum 0,80 mm; Specifies the requirements of enamelled rectangular copper winding wire of class 120 with a sole coating based on polyvinyl acetal resin, which may be modified providing it retains the chemical identity of the original resin and meets all specified wire requirements. Class 120 is a thermal class that requires a minimum temperature index of 120 and a heat shock temperature of at least 155 °C. The temperature in degrees Celsius corresponding to the temperature index is not necessarily that at which it is recommended that the wire be operated and this will depend on many factors, including the type of equipment involved. The range of nominal conductor dimensions covered by this standard is as follows: - width:maximum 16,0 mm; - thickness:maximum 5,60 mm. Wires of grade 1 and grade 2 are included in this specification and apply to the complete range of conductors. The specified combinations of width and thickness as well as the specified ratio width/ thickness are given in IEC 60317-0-2. The main changes with respect to the previous edition are listed below: - new requirements for appearance, Subclause 3.2, added; - new pin hole test, Clause 23, added.