| 摘要 |
PURPOSE:To make recording and reproducing of a good linearity possible, by subjecting an analogue frequency to both-edge pulse modulation by the carrier wave of a frequency higher than its frequency band and by recording it onto a recording medium in vertical magnetization. CONSTITUTION:An analogue input signal is supplied to a both-edge PWM modulator 2 through an amplifier 1 and is subjected to both-edge pulse modulation by the carrier wave of a frequency higher than the frequency of the input signal. A magnetic head 5 to which this modulated signal is given converts the signal to a recording magnetic field of an amplitude larger than that of its magnetization inverting magnetic field and recording it onto a recording medium 4, which has a rectangular hysteresis characteristic, in vertical mangetization. Next, this recording medium 4 is reproduced by a reproducing head 6 which has characteristics of a high sensitivity for input signal frequency components and of a low sensitivity for carrier frequency components. Thus, analogue signal recording and reproducing of a good linearity is performed. |
