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    • 34. 发明授权
    • Method of manufacturing 3-DPA-lactone
    • 制备3-DPA-内酯的方法
    • US5322955A
    • 1994-06-21
    • US938238
    • 1992-10-22
    • Katsuya MatsumotoTakashi EbataHiroshi KawakamiKoshi KosekiHajime Matsushita
    • Katsuya MatsumotoTakashi EbataHiroshi KawakamiKoshi KosekiHajime Matsushita
    • C07D307/33C07D233/00
    • C07D307/33Y02P20/55
    • In the method of the present invention for manufacturing 3-DPA-lactone, a protective group is introduced in the first step into the hydroxyl group at 4-position of .gamma.-ribonolactone by an ordinary method. Then, an acid anhydride or an acid chloride is added in the presence of a tertiary amine compound so as to conduct a .beta.-elimination of the hydroxyl group at the 3-position. As a result, a double bond is formed between the 2- and 3-positions and, at the same time, the hydroxyl group at the 2-position is acylated. The double bond between the 2- and 3-positions is reduced in the next step by means of a catalytic hydrogenation. Finally, the protective group of the hydroxyl group is eliminated by an ordinary method. The particular method permits using readily available raw materials, decreasing the number of manufacturing steps, and easily and selectively synthesizing the desired 3-DPA-lactone, which is hardly obtained from nature in a large amount, in high yield, compared with the conventional method.
    • PCT No.PCT / JP92 / 00186 Sec。 371日期:1992年10月22日 102(e)日期1992年10月22日PCT提交1992年2月21日PCT公布。 第WO92 / 14721号公报 日本9月3日。在本发明的制备3-DPA-内酯的方法中,通过常规方法,将第一步中的保护基引入γ-内酯的4-位的羟基。 然后,在叔胺化合物的存在下加入酸酐或酰氯,以在3-位进行羟基的β-烯丙基化。 结果,在2-位和3-位之间形成双键,并且同时将2-位的羟基酰化。 通过催化氢化,在下一步骤中2-和3-位之间的双键被还原。 最后,通过常规方法除去羟基的保护基。 该特定方法与常规方法相比,允许使用容易获得的原料,减少制造步骤的数量,并且容易且有选择地合成从大量难以获得的大量难以获得的所需3-DPA-内酯 。
    • 36. 发明授权
    • Apparatus for muting noise resulting from reproducing of a PCM audio
signal recorded in an extension of a slant track containing a recorded
video signal
    • 用于使记录在包含记录的视频信号的倾斜轨道的扩展中的PCM音频信号的再现产生的噪声静噪的装置
    • US5181125A
    • 1993-01-19
    • US757232
    • 1991-09-10
    • Hiroshi Kawakami
    • Hiroshi Kawakami
    • H02P1/18H04N5/911H04N5/928H04N5/93H04N5/94
    • H04N5/911H04N5/928H04N5/93H04N5/94
    • An apparatus for reproducing video signals recorded in slant tracks on a magnetic tape also having respective pulse code modulated audio signals recorded in extensions of the slant tracks with gaps therebetween: comprises a rotary head drum having magnetic heads mounted thereon with an angular spacing of 180 degrees therebetween for scanning the slant tracks and extensions thereof and thereby providing reproduced head outputs containing video and audio signals reproduced from the magnetic tape with dropouts in said reproduced head outputs corresponding to the gaps between the respective recorded video and audio signals; and a signal extracting circuit including a head changeover switch receiving the reproduced head outputs and responsive to a head switching signal synchronized with rotation of the head drum to provide a switched output which, in a normal reproducing mode employing a tape speed equal to that for recording, consists of the reproduced video signals and, in another reproducing mode employing a different tape speed, also includes the dropouts and noises corresponding to at least portions of the reproduced audio signals. Dropouts in the switched output are detected to provide dropout detected pulses, and the switched output is muted in response to muting signals each initiated by a respecitve dropout detected pulse and continuing for a period corresponding to the duration of the respective dropout and the following noise so as to eliminate from the switched output in the other reproducing mode noises due to audio signals that may be contained therein.
    • 一种用于再现记录在磁带上的倾斜磁道中的视频信号的装置,还具有记录在其间具有间隙的倾斜磁道的延伸部分中的相应的脉冲编码调制音频信号:包括安装有角度间隔为180度的磁头的旋转磁头鼓 用于扫描倾斜轨道及其延伸部分,从而提供再现的头部输出,其中包含从磁带再现的视频和音频信号,在与所记录的视频和音频信号之间的间隙对应的所述再现的头部输出中具有出口; 以及信号提取电路,包括接收再现磁头输出的磁头切换开关,并且响应与磁头磁鼓转动同步的磁头切换信号,以提供切换输出,该切换输出在采用等于记录速度的磁带速度的正常再现模式下 由再现的视频信号组成,并且在采用不同磁带速度的另一种再现模式中,还包括对应于再现的音频信号的至少一部分的丢失和噪声。 检测到切换输出中的丢失以提供检测到的丢失的脉冲,并且响应于由分别丢失检测到的脉冲启动的静噪信号并且连续相应于相应丢失的持续时间和随后的噪声的周期,开关输出被静音 为了从另一再现模式中的切换输出消除由于可能包含在其中的音频信号引起的噪声。