公开(公告)号：EP0828385A3

公开(公告)日：2001-03-21

申请号：EP97115337.4

申请日：1997-09-04

申请人： NEC CORPORATION ,  NIPPON HOSO KYOKAI

发明人： Takeda, Haruo ,  Tatsumi, Yukio ,  Fujitani, Ikuji ,  Shioda, Takuya ,  Yoshimi, Tomofumi ,  Sugimoto, Tomohiko ,  Haeiwa, Kazuhisa

IPC分类号： H04N5/40

CPC分类号： H03C1/00 ,  H04N5/40

摘要： Since output voltage e of coupler CU2 is displaced in phase by -135 degrees from input signals c and d (by -270 degrees from signals a and b), a carrier which makes signal f is phase shifted by -270 degrees by phase shifter ϕ1 so that signal f may have the same phase as signal e. Signal f and signal e are power composed by first 3 dB coupler M1, and are further phase shift controlled by variable phase shifters PH11 and PH12 so that they may have the same phase. Further, an output signal of variable phase shifter PH11 is phase shifted by -90 degrees by phase shifter SH1 so that it has a phase difference by 90 degrees from an output signal of variable phase shifter PH2, and the two signals controlled in this manner are inputted to 3 dB coupler M2. Consequently, two signals e and f inputted to the amplifier are all outputted as output voltage EOUT. According to the present invention of a television broadcasting machine, since a carrier is phase modulated and amplitude modulated with amplitude information and phase information obtained from an input video signal, a vestigial side band signal is outputted to form a television signal without using vestigial side band.

公开(公告)号：EP0828385B1

公开(公告)日：2006-06-14

申请号：EP97115337.4

申请日：1997-09-04

申请人： NEC CORPORATION ,  NIPPON HOSO KYOKAI

发明人： Takeda, Haruo ,  Tatsumi, Yukio ,  Fujitani, Ikuji ,  Shioda, Takuya ,  Yoshimi, Tomofumi ,  Sugimoto, Tomohiko ,  Haeiwa, Kazuhisa

IPC分类号： H04N5/40

CPC分类号： H03C1/00 ,  H04N5/40

公开(公告)号：EP0828385A2

公开(公告)日：1998-03-11

申请号：EP97115337.4

申请日：1997-09-04

申请人： NEC CORPORATION ,  NIPPON HOSO KYOKAI

发明人： Takeda, Haruo ,  Tatsumi, Yukio ,  Fujitani, Ikuji ,  Shioda, Takuya ,  Yoshimi, Tomofumi ,  Sugimoto, Tomohiko ,  Haeiwa, Kazuhisa

IPC分类号： H04N5/40

CPC分类号： H03C1/00 ,  H04N5/40

摘要： Since output voltage e of coupler CU2 is displaced in phase by -135 degrees from input signals c and d (by -270 degrees from signals a and b), a carrier which makes signal f is phase shifted by -270 degrees by phase shifter φ1 so that signal f may have the same phase as signal e. Signal f and signal e are power composed by first 3 dB coupler M1, and are further phase shift controlled by variable phase shifters PH11 and PH12 so that they may have the same phase. Further, an output signal of variable phase shifter PH11 is phase shifted by -90 degrees by phase shifter SH1 so that it has a phase difference by 90 degrees from an output signal of variable phase shifter PH2, and the two signals controlled in this manner are inputted to 3 dB coupler M2. Consequently, two signals e and f inputted to the amplifier are all outputted as output voltage EOUT. According to the present invention of a television broadcasting machine, since a carrier is phase modulated and amplitude modulated with amplitude information and phase information obtained from an input video signal, a vestigial side band signal is outputted to form a television signal without using vestigial side band.

公开(公告)号：EP1037443B1

公开(公告)日：2005-10-26

申请号：EP00105711.6

申请日：2000-03-17

申请人： NEC CORPORATION

发明人： Mori, Nobuyuki ,  Takeda, Haruo

IPC分类号： H04L27/36 ,  H03C5/00

CPC分类号： H04L27/361 ,  H04L27/2601

公开(公告)号：EP1037443A3

公开(公告)日：2004-02-04

申请号：EP00105711.6

申请日：2000-03-17

申请人： NEC Corporation

发明人： Mori, Nobuyuki ,  Takeda, Haruo

IPC分类号： H04L27/36 ,  H03C5/00

CPC分类号： H04L27/361 ,  H04L27/2601

摘要： An OFDM (Orthogonal Frequency Division Multiplexing) modulator of the present invention includes a polar coordinates converter to which real axis data and imaginary axis data output from a discrete inverse Fourier transformer are input. The converter converts the two kinds of input data to amplitude data to phase data. A carrier wave is subjected to phase modulation using the phase data and then input to a power amplifier as an input RF (Radio Frequency) signal. The power amplifier is implemented by a C class power amplifier having inherently high power utilization efficiency. The output level of the power amplifier is controlled in accordance with the amplitude data.

公开(公告)号：EP1037443A2

公开(公告)日：2000-09-20

申请号：EP00105711.6

申请日：2000-03-17

申请人： NEC Corporation

发明人： Mori, Nobuyuki ,  Takeda, Haruo

IPC分类号： H04L27/26

CPC分类号： H04L27/361 ,  H04L27/2601

摘要： An OFDM (Orthogonal Frequency Division Multiplexing) modulator of the present invention includes a polar coordinates converter to which real axis data and imaginary axis data output from a discrete inverse Fourier transformer are input. The converter converts the two kinds of input data to amplitude data to phase data. A carrier wave is subjected to phase modulation using the phase data and then input to a power amplifier as an input RF (Radio Frequency) signal. The power amplifier is implemented by a C class power amplifier having inherently high power utilization efficiency. The output level of the power amplifier is controlled in accordance with the amplitude data.

摘要翻译： 本发明的OFDM（正交频分复用）调制器包括输入从离散傅里叶逆变换器输出的实轴数据和虚轴数据的极坐标转换器。 转换器将两种输入数据转换为振幅数据到相位数据。 使用相位数据对载波进行相位调制，然后输入到功率放大器作为输入RF（射频）信号。 功率放大器由具有固有的高功率利用效率的C级功率放大器实现。 功率放大器的输出电平根据振幅数据进行控制。