Seeing is believing
The two-channel "multiplexer" works by decoding the signals from two television channels and cramming them into one, which is then recorded on to one tape. When the tape is played back, the signal carrying both recordings is separated into two channels, either of which can be selected by the viewer.
According to Ezra, British companies "threw the device back across the desk at me. But I did think I was getting somewhere when one company paid me hush money not to talk about it."
In spite of these early setbacks, Japanese engineers have pledged to market the device, which also enables users to record over an existing programme without erasing it.
Models could be on sale in Britain next year, or installed in the next generation of video recorders.
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