| 摘要 |
PCT No. PCT/JP87/00827 Sec. 371 Date Jun. 28, 1988 Sec. 102(e) Date Jun. 28, 1988 PCT Filed Oct. 27, 1987 PCT Pub. No. WO88/03348 PCT Pub. Date May 5, 1988.The invention relates to a mode discrimination circuit for use in a magnetic recording and/or reproducing apparatus. A reproduced luminance signal FM wave is applied to a bandpass filter which passes the frequencies which are in the vicinity of a tip of a synchronizing signal of the standard mode. The output of the bandpass filter is applied to an envelope wave detection circuit which provides a detected output. The detected output is applied to a hold circuit which holds the detected output for a predetermined period of time to thereby output a signal indicative of a standard or high band recording mode of the reproduced luminance signal FM wave.
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