查询词典 passband

From the lumped equivalent circuit model, the phase shift/attenuation and impedance characteristics of the novel structure are first analysed based on the Bloch theory, which shows the novel structure has properties analogous to those of a bandpass filter: the attenuation constant keeps zero with a continuous and smooth characteristic impedance distribution within the passband and the bandwidth may be arbitrarily specified; characteristic impedance is purely imaginary with the inhibition of the electromagetic wave propagation outside the passband.

首先从一般的等效电路模型出发，根据Bloch周期性理论对该结构的相移、衰减和阻抗特性进行了分析，结果表明该新结构具有类似带通滤波器的特性：通带内衰减常数为零，特性阻抗为实数并随频率连续平滑分布，具有可任意指定的阻抗匹配带宽；带外特性阻抗为纯虚数，电磁波传播受到抑制。

Tunable passband property of the stepped-impedance resonator is used for the design of dual-band bandpass filter that can be applied to wireless local area network communication system. Design theory for this type of filter is presented.

利用阶梯阻抗谐振器的通带可调的特性，设计了可用于无线局域网通信系统的双通带滤波器，给出了设计理论。

SRC in SDR is also discussed, and two improved structures of CIC filter are presented. The first one is a CIC decimation filter based on polyphase structure and partially sharpening technique, which is suitable for the situation where the requirements in passband attenuation is not very high while the requirements in alias suppression and operating speed are relatively high. The other one is an improved CIC-Rotated Sinc decimator which possesses improved frequency response, low operating rate and low cost in hardware as well.

研究了软件无线电中的采样率转换技术，给出两种改进的CIC滤波器结构；(1)基于多相结构和部分尖锐化的CIC抽取滤波器，该结构适用于通带衰落要求不是很高，混迭抑制和滤波速度的要求相对较高的场合(2)一种改进CIC-Rotated Sinc抽取滤波器，该结构在获得好的通阻带特性的前提下，一方面降低了整个CIC滤波器结构的工作速率，另一方面尽可能地降低硬件实现的复杂度。

The loss compensation is only activated at the filter's passband, and the insertion loss could be adjusted without affecting the filter's center frequency and 3-dB bandwidth.

共震器的损耗补偿只作用於主动滤波器的导通频段内，而且介入损失的调整并不影响到主动滤波器的中心频率与 3 dB频宽。

7 To 3.3 V operating supply voltage 44.1 kHz sampling frequency 16.9344 MHz (384fs) system clock Built-in crystal oscillator circuit 16-bit, MSB rst, rear-packed serial data input format ( 64 fs bit clock) 8-times oversampling digital lter · 32 dB stopband attenuation ·+0.05 to -0.05 dB passband ripple Deemphasis lter operation · 36 dB stopband attenuation ·-0.09 to +0.23 dB deviation from ideal deem- phasis lter characteristics Attenuator · 7-bit attenuator (128 steps) set by microcontrol- ler Soft mute function set by parallel setting ·(approximately 1024/fs total muting time) Mono setting · Left or right channel mono selectable by micro- controller Built-in innity-zero detection circuit , two-channel D/A converter · 3rd-order noise shaper · 32fs oversampling Built-in 3rd-order post-converter low-pass lters 24-pin VSOP package Molybdenum-gate CMOS process

2.7至3.3 V工作电源电压为44.1千赫的采样频率16.9344兆赫（384fs）系统时钟内置晶体振荡器电路的16位，MSB在前，后包装的串行数据输入格式（64飞秒位时钟）8倍超采样数字滤波器·32分贝的阻带衰减·+0.05至-0.05分贝通带纹波去加重滤波器的运作·36 dB抑制频宽衰减·-0.09到0.23 dB的偏差认为不理想，症状困扰评估滤波特性衰减器·7位衰减器（128级）集由单片机在-莱尔软静音功能的平行设置·（共约1024/fs静音时间）单声道设置·左或右声道单声道微控制器可选的内置的无限零检测电路Δ，两通道的D / A转换器·第三阶噪声整形·32fs过采样内置三阶后转换器的低通滤波器24引脚VSOP封装钼栅CMOS工艺

On the basement of passband subsampling and digital downconvertion, according to QPSK with 30M carrier frequency and 8M bandwidth, digital IF channel is elaborately analyzed .

以对中频为30MHz，带宽为±4MHz的输入QPSK信号进行带通欠采样和数字下变频为基础，提出和分析了中频数字化通道的实现方案，进行了相应的多相低通抽取滤波器的设计，并针对数字中频信号就数字下变频模块进行了仿真，从而验证了整个下变频系统参数设计的可行性。

On the basement of passband subsampling and digital downconvertion, according to QPSK with 30M carrier frequency and 8M bandwidth, digital IF channel is elaborately analyzed .In this module, multiple phase filters are elaborately designed .According to this module, IF digital signal is simulated .

以对中频为30MHz，带宽为±4MHz的输入QPSK信号进行带通欠采样和数字下变频为基础，提出和分析了中频数字化通道的实现方案，进行了相应的多相低通抽取滤波器的设计，并针对数字中频信号就数字下变频模块进行了仿真，从而验证了整个下变频系统参数设计的可行性。

The experimental results confirm that the insertion loss, BAW suppression, passband ripples and receiving loss of the wavelet reconstruction device using the new scheme are remarkably improved using early schemes.

实验结果表明，用新方案实现的小波重构器件比用早期方案实现的小波重构器件在插入损耗、体声波抑制、通带波纹和接收损耗方面均有明显的改善。

It is shown that, the impact of IPI due to the pre-filter is insignificant to noncoherent receiver, and there exist different optimal pre-filter passband widths for different channels and input SNRs.

结果表明，在信道模型CM1~CM4下，前置滤波器产生的多径分量干扰平均来说对其输出能量的影响很小，并且一般来说存在一个最佳的滤波器带宽值。

A low-loss rectangular-passband multiplexer including a three-arm interferometer coherently connected to a waveguide grating router, resulting in a passband substantially of type N=3, without intrinsic loss.

本发明提供了一种低损耗的矩形通带复用器，包括相干连接到波导光栅路由的三臂干涉仪，形成大致为N＝3类型的通带，而没有本征损耗。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。