Magnetic picture recording reproduction device
专利汇可以提供Magnetic picture recording reproduction device专利检索，专利查询，专利分析的服务。并且PURPOSE:To accelerate the pull-in at the recording time by giving a comparison through the phase comparator between the revolution detection pulse detected the rotary phase of the rotary head and the phase of the vertical synchronous signal in the video signal to be recorded and then using the output to give the revolution control to the rotary head. CONSTITUTION:In the magnetic picture recording reproduction device incorcporating several units of the rotary heads, the video signal is applied to synchronous isolator circuit 11 to give isolation to the vertical synchronous signal of 60Hz. On the other hand, the pulse is induced to coil 6 in accordance with revolution of rotary heads 2 and 3 to be changed into the rotary detection pulse through phase shifter 22. with this detection pulse, the gate pulse featuring a fixed phase relation and a fixed time duration is generated from gate pulse generation circuit 25. At the same time, delay circuit 24 gives a dealy so that the revolution detection pulse may be at the center of the gate pulse. The gate pulse of circuit 25 is applied to gate 26, and the vertical synchrounous signal is made to pass through during that period to have the phase comparison at phase comparator 18 with the delayed revolution detection pulse. And this output is applied to VCO20 via LPF19 to vary the oscillation frequency and thus to control motor 4.，下面是Magnetic picture recording reproduction device专利的具体信息内容。
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