HELICAL-SCAN VIDEO TAPE CASSETTE SYSTEM USING 12,65 MM (0,5 IN) MAGNETIC TAPE ON TYPE VHS - PART 2: FM AUDIO RECORDING
International Electrotechnical Committee
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
Applies to frequency modulation (FM) audio recording fully compatible with the VHS system which is defined in IEC 60774-1. The aim of this standard is to define the mechanical and electrical characteristics of FM audio recording which provides for the interchangeability of recorded cassettes. Related to 525 line-60 field and 625 line-50 filed systems.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | SC 100B |
