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    • 6. 发明公开
    • FM audio record reproducing apparatus
    • WiedergabegerätfürFM-Audio-Signale。
    • EP0351845A2
    • 1990-01-24
    • EP89113340.7
    • 1989-07-20
    • AKAI ELECTRIC CO., LTD.
    • Matsuoka, Hideo c/o Akai Electric Co., Ltd.
    • G11B20/06G11B20/02
    • G11B20/06G11B20/02
    • A reproducing apparatus which is provided with: frequency converting means (21) for performing frequency conversion of the FM regenerative signals respectively from the read heads, on the basis of frequency conversion signals each having a frequency different from the frequency of the carrier; voltage-controlled oscillators (22) for generating the frequency conversion signals, respectively; phase comparators (23) for comparing phases of two FM regenerative signals frequency-converted by the frequency converting means (21) in the overlap period so as to produce a difference signal corresponding to the difference between the phases; switching circuits (25) for feeding the difference signal generated by the phase comparators (23), into one of the voltage-controlled osciallators (22) generating the frequency conversion signal for frequency conversion of succeedingly reproduced one of the FM regenerative signals in the overlap period; and loop filters (24) for stabilizing a loop system constituted by the aforementioned parts; whereby the phases of two frequency-changed FM regenerative signals are made to coincide with each other before the switching of the output in the overlap period.
    • 一种再生装置,具备:频率转换装置,用于根据每个具有与载波频率不同的频率的频率转换信号,分别从读出头执行FM再现信号的频率转换; 压控振荡器(22),用于分别产生频率转换信号; 相位比较器(23),用于比较在所述重叠周期中由所述频率转换装置(21)频率转换的两个FM再生信号的相位,以便产生与所述相位之间的差相对应的差分信号; 用于将由相位比较器(23)产生的差分信号馈送到产生用于频率转换的频率转换信号的压控奥斯卡拉尔(22)之一的开关电路(25),用于在重叠中再现的一个FM再生信号 期; 以及用于稳定由上述部件构成的环路系统的环路滤波器(24) 由此,在重叠期间的输出切换之前,使两个频率变化的FM再生信号的相位彼此一致。