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1. 发明授权

US5327462A Digital type VSB modulation apparatus 失效
标题翻译：数字式VSB调制装置
公开(公告)号：US5327462A
公开(公告)日：1994-07-05
申请号：US832724
申请日：1992-02-07
申请人： Yasuo Takahashi , Tatsuya Ishikawa , Toshio Aoki , Nobuyuki Miki , Masatoshi Hamada , Masatoshi Hamada , Yasuhiro Hashimoto , Kenji Ueoka , Nobuhiko Kawai
发明人： Yasuo Takahashi , Tatsuya Ishikawa , Toshio Aoki , Nobuyuki Miki , Masatoshi Hamada , Masatoshi Hamada , Yasuhiro Hashimoto , Kenji Ueoka , Nobuhiko Kawai
IPC分类号： H03C1/00 , H03C1/60 , H04L27/04 , H03C1/52
CPC分类号： H04L27/04
摘要： In this invention, in order to generate a VSB modulation signal from a digital baseband signal, an in-phase component of a modulation signal having a frequency spectrum having a high-frequency component whose level is half that of its low-frequency component, and an orthogonal component of the modulation signal of a high-frequency component having a frequency spectrum whose level is half that of the low-frequency component are generated from the baseband signal. The in-phase component and the orthogonal component are multiplied with carrier signals to obtain a carrier in-phase component and a carrier orthogonal component. The carrier in-phase component and the carrier orthogonal component are synthesized to obtain a VSB modulation signal.
摘要翻译：在本发明中，为了从数字基带信号生成VSB调制信号，具有具有其低于其低频分量的一半的高频分量的频谱的调制信号的同相分量，以及从基带信号生成具有电平为低频分量的一半的频谱的高频分量的调制信号的正交分量。将同相分量和正交分量与载波信号相乘以获得载波同相分量和载波正交分量。合成载波同相分量和载波正交分量以获得VSB调制信号。

2. 发明授权

US5272454A Digital FM modulator using direct digital synthesizer 失效
标题翻译：数字FM调制器采用直接数字合成器
公开(公告)号：US5272454A
公开(公告)日：1993-12-21
申请号：US930759
申请日：1992-08-14
申请人： Isao Ikai , Masatoshi Hamada , Yasuhiro Hasimoto , Yoshio Tachioka , Makoto Ishii
发明人： Isao Ikai , Masatoshi Hamada , Yasuhiro Hasimoto , Yoshio Tachioka , Makoto Ishii
IPC分类号： H03C3/00 , H03C3/06 , H03C3/09 , H03C3/02
CPC分类号： H03C3/00
摘要： A digital FM modulator includes an A/D converter, a multiplier, an adder, a direct digital synthesizer, and an addition data output circuit. The A/D converter digitally encodes an input modulation signal. The multiplier multiplies an output from the A/D converter and multiplication data input from an external circuit. The adder adds output data from the multiplier to addition data. The direct digital synthesizer changes an oscillation frequency on the basis of output data from the adder with respect to a reference frequency of a reference oscillator. The addition data output circuit changes the addition data to prevent a center frequency from changing in accordance with the multiplication data and outputs the addition data.

3. 发明授权

US5418819A Transmitting apparatus and receiving apparatus based on phase modulation method 失效
标题翻译：基于相位调制方式的发射装置和接收装置
公开(公告)号：US5418819A
公开(公告)日：1995-05-23
申请号：US94031
申请日：1993-07-14
申请人： Masatoshi Hamada , Nobuhiko Kawai , Makoto Ishii , Hirokazu Toyota
发明人： Masatoshi Hamada , Nobuhiko Kawai , Makoto Ishii , Hirokazu Toyota
IPC分类号： H04L27/20 , H04L27/18
CPC分类号： H04L27/2025
摘要： A transmitting apparatus based on phase modulation including a data encoding circuit (100), a phase locus control circuit (200) and a modulator (300). The data encoding circuit (100) divides input data to be transmitted into a predetermined number of bits, and sequentially outputs them as segmented data. The phase locus control circuit (200) outputs a phase locus control signal representing each of the segmented data by three values of a positive direction, a negative direction and a non-rotation state of the phase rotation. The modulator (300) changes the phase of a transmission signal in response to the phase locus control signal. Using the phase rotation direction information of the three values makes it possible to reduce transmission bits, to increase transmission speed and transmission capacity.
摘要翻译： PCT No.PCT / JP92 / 01445 Sec。 371日期：1993年7月14日 102（e）日期1993年7月14日PCT提交1992年11月6日PCT公布。公开号WO93 / 10612 PCT 日期：1993年5月27日。一种基于包括数据编码电路（100），相位轨迹控制电路（200）和调制器（300）的相位调制的发送装置。数据编码电路（100）将要发送的输入数据划分成预定数量的比特，并将其顺序输出作为分段数据。相位轨迹控制电路（200）通过相位旋转的正方向，负方向和非旋转状态的三个值输出表示每个分割数据的相位轨迹控制信号。调制器（300）响应于相位轨迹控制信号改变发送信号的相位。使用三个值的相位旋转方向信息可以减少传输比特，提高传输速度和传输容量。

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