Using Balanced Audio reduces noise pick up introduced through interference. The amount of information that can be passed through a given circuit in a given time. In the case of video, the larger the bandwidth the greater the picture detail can be. Betacam An analogue videotape format using 12.5mm tape developed by Sony and derived from the earlier Betamax. Sadly it does not exist any more.
Back issues are available on the web .
This is a noise reduction system used on some Betamax VCR's to reduce tape hiss on the linear audio track. These are the three modes of operation of an NTSC Betamax. Beta II is the original standard. Beta III is a mode whereby the tape speed is reduced to allow more material to be fitted on to a fixed length tape. I uses a high tape speed for improved picture quality.