Studio (non Broadcast) MAC Variants
S-MAC (Studio MAC): Used mostly in North America.
- Processing NTSC component signals yields better results (a higher quality image) than manipulating NTSC directly – thus the need to create S-MAC.
- It is not possible to mix standard MAC signals in the studio environment because the (R-Y) and (B-Y) components are carried on alternate lines.
- S-MAC's SECAM like approach to bandwidth reduction is technical annoyance, but most studio users are not affected by it.
- In S-MAC the luminance is compressed by 2:1 and the two chrominance signals by 4:1 so that all three may occupy the same line.
- S-MAC's vision bandwidth is 11 MHz, only ~2.8x that of NTSC's vision bandwidth of 4.2 MHz.
- S-MAC can be carried on a single circuit and converted losslessly to and from C-MAC at any stage.
- S-MAC is well suited for SNG applications (AKA: news gathering trucks).
Read more about this topic: Multiplexed Analogue Components
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