Digital data converting equipment for recording and playback - receives data chain for modulation and adding to pilot signal followed by spectrum analysis

摘要

A pilot signal at a specific frequency is added to an input data chain. The data are received by a control bit adder (1) and the output is processed by a non-return to zero stage (2). This is followed by a data chain adder unit (3) that adds a pilot signal to the NRZ modulated data chain signal. A short time base spectrum analyser (4) analyses the produced data chain and a memory (5) stores the result. The stored value is compared (6) and received by a selector (7), also receiving the NRZ modulated signal. ADVANTAGE - High conversion efficiency with reduced size of circuit.