专利名称：M-ary frequency shift keying (FSK)后背发凉
茶艺课程
modulator
双眼皮有几种做法发明人：Matsuura, Takashi, c/o NEC Corporation 申请号：EP93304908.2
诊所申请日：19930623创青春
公开号：EP0577323B1
公开日：
19961211
班的拼音
专利内容由知识产权出版社提供
摘要：A multilevel frequency-shift keying (FSK) modulator is disclod in which the transient respon for frequency transition can be easily t. The modulator is of a type in which a frequency generated by a voltage-controlled oscillator (VCO) is changed in accordance with multilevel code and is pha-locked by a pha-locked loop (PLL). The modulator is provided with a pha-lock feedback circuit that, combined with a VCO, makes up a PLL, first and cond VCOs (1,11) and filter means (12) having a desired transient respon characteristic. At a transient time of frequency transition due to a change of the multilevel code, the first VCO (1) and feedback circuit makes up the PLL, and the first control voltage for the first VCO (1) produced in the PLL is inputted as the cond control voltage to the cond VCO (11) through the filter means (12). Accordingly, the FSK signal delivered from the cond VCO (11) has transient respon characteristic depending on the characteristic of the filter means (12), and as a result, the transient respon characteristic of the FSK modulator can be t to a desired characteristic by modifying the characteristic of the filter means (12) without changing the other circuit parameters.炒莴笋尖
戚城遗址
申请人：NEC CORPORATION
代理机构：Moir, Michael Christopher 更多信息请下载全文后查看
