| http://www.w3.org/ns/prov#value | - The following is a description of a composite transmission system embodying the invention suitable for integrating three multiplexed digital data channels D1, D2 and D3 at the binary rate of 64 kbits per second, into the horizontal blanking and synchronizing signal, and for integrating a digital data channel D4 at the binary rate of 64 kbits per second, into the field blanking and synchronizing si
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