IEC 60774-2:1999

FOREWORD
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 centre frequency
    5.4 Frequency deviation
    5.5 Modulation polarity
    5.6 Recording level
6 Other subjects (channel application)
Annex A (normative) Encoder transient measurement method
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 centre frequencies
Table 4 - Channel applications

This part of IEC 60774 is applicable to frequency modulation (FM) audioi recording fully compatible with the VHS system defined in IEC 60774-1. The object of this standard is to define the electrical and mechanical characteristics fo FM audio recording which will provide for the interchangeability of recorded cassettes. The requirements given relate to 525 line-60 field and 625 line-50 field systems.