只有很少的电视台，因为频段稀缺。
Only a small handful of stations existed, because spectrum was scarce.
一个基站可以有三种频段工作。
其实，我们每个人能看到的色彩频段都不完全相同。
Everyone doesn't see the color frequency in exactly the same way.
该多频段微型收发器也有最低的功率要求。
还有当地的公共图书馆也该有免费的音频段。
Your local public library should also carry a selection of audio programs that you can check out for free.
无线系统的扩散对频段的需求并增加了其价值。
The proliferation of wireless systems has pushed up the demand for spectrum and increased its value.
更甚者，有些电视和无线电发射台非法使用该无线电频段。
Making matters worse, some TV and radio transmitters were illegally using that radio band.
然而，人眼可见的光在整个光谱中只占一个非常狭窄的频段。
Horses live in a monochrome world .light visible to human eyes however occupies only a very narrow band in the whole electromagnetic spectrum.
目前英国很多3g服务使用的都是2,100mhz频段。
Many 3g services in the country are often put on the 2,100mhz band.
该频段的信号可以穿透墙壁，从而非常适合无线宽带。
Signals in the spectrum can penetrate walls, making it ideal for wireless broadband.
该无线电系统还可扩展频率范围，提供低频段甚高频。
The radio also has an extended range that provides access to low-band VHF.
但这并未阻止其为了保住未用的空白频段，而争得头破血流。
That has not stopped them fighting tooth and claw to hang on to their unused white space.
而空白频段装置的数据率有望高达400~800Mbps。
White-space devices are expected to be able to zip data along at 400-800Mbps.
一旦冲突被检测出来，它们可即时切换到未用频谱的备份频段。
When a conflict is detected, they switch to a backup slice of unused spectrum on the fly.
臂带上的声波检测器带有五个压电悬臂，每一个可以检测某个特定频段的声音。
The acoustic detector in the armband contains five piezoelectric cantilevers, each weighted to respond to certain bands of sound frequencies.
在至今二十多年里，对于免执照应用，这是第一个重要的波谱频段。
This is the first significant block of spectrum made available for unlicensed use in more than 20 years.
与多频段军用无线电不同，Liberty的设计满足了严格的公共安全规范。
Unlike multiband military radios, Liberty is designed to meet stringent public safety specifications.
传统的太阳能电池主要使用一种材料，只高效捕捉其一部分频段的能量。
Conventional solar cells use one primary material, which only captures one part of the spectrum efficiently.
此图像被经过彩色编码处理以显示天空在普朗克观察频段范围下的样子。
The picture has been color-coded to show how the sky looks over the range of frequencies observed by Planck.
CTIA希望将来在700mhz到2.5GHz的频段可以有效适用于移动服务。
The CTIA would like that spectrum to be in bands between about 700mhz and 2.5ghz that are best suited to mobile services.
大部分电视广播公司都制订了宏伟计划，要利用这些频段向公众推销信息服务。
Most had grand plans for using such frequencies to sell information services to the public.
同时，为了维持无线技术的增长需要，美国联邦通信委员会需要宽的无线电频段。
Likewise, the Federal Communication Commission has become acutely attuned to the need for additional greater spectrum in order to sustain wireless growth and demand..
电视白色空间频段上的信号传输稳定。所以这个频段非常适于无线移动设备的应用。
TV white space spectrum signals travel well, making it well suited for mobile wireless devices.
同时可以通过改变波段的频率以避免信号间的相互干扰，以便更多的频段能够得到使用。
The frequency of the wave can be changed so that signals do not interfere with one another, allowing more of the spectrum to be used.
但谷歌在信中敦促FCC采用“频段感应”等一系列旨在防止信号互相干扰的交叉技术。
But Google in its letter urged the FCC to adopt a series of overlapping technologies, including 'spectrum sensing,' designed to prevent signals from interfering with each other.
FCC为数字信号广播划分了新的频段，所以目前每个广播商都拥有一个模拟频道和一个数字频道。
The FCC gave television broadcasters a new frequency to use for their digital broadcasts, so right now each broadcaster has an analog TV channel and a digital TV channel.
Cubic公司研发多频段微型收发器，以满足日益增长的多波段可移动加密设备要求。
Cubic developed the MMT to meet the growing operational requirement for multiband units with removable encryption.
新能源包也能从电磁波频段吸收能量，使步兵降低被使用红外技术的夜视设备发现的概率。
The new power pack will also absorb energy across the electromagnetic spectrum, making infantry less liable to detection by night vision equipment that uses infra-red technology.
新能源包也能从电磁波频段吸收能量，使步兵降低被使用红外技术的夜视设备发现的概率。
The new power pack will also absorb energy across the electromagnetic spectrum, making infantry less liable to detection by night vision equipment that uses infra-red technology.
应用推荐