На англоязычных ресурсах нашел больше типов записи
Цитата:
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Push-pull film recording is classified under three headings - Class A, Class B, and Class AB. In Class A the signal energy is divided to form two identical tracks 180 degrees out of phase. In Class B one track records the positive half-cycles, whilst the other track records the negative half-cycles. In Class AB, which is of an experimental nature, the recorder is so adjusted that low levels are recorded as Class A and high levels as Class B. Reproduction of either class requires an amplifier with a push-pull input using two photo-electric cells, or a photo-electric cell having two anodes and two cathodes.
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Жаль только понятней не стало, как именно этот тип модулируется.