dB bandwidth refers to the frequency range defined when the highest point of the power spectral density drops to 1/2. In physics, the signal is generally expressed in the form of a wave, when the power spectrum density of the wave is multiplied by an appropriate coefficient, the power carried by the wave per unit frequency will be obtained, which is called the power spectrum density of the signalDegree.
dB bandwidth refers to the amplitude equal to the maximum of two times the square of the corresponding band width amplitude is the power, after the square becomes 1/2 times, in the logarithmic coordinate is the -3dB position, that is, the half power point, the corresponding bandwidth is the bandwidth of the power before it is reduced to half. Indicates that half of the power is concentrated in this bandwidth. In general, the spectral density is a similar "arch" shape.
dB bandwidth usually refers to the frequency range defined when the highest point of the power spectral density falls to 1/2.
DB bandwidth belongs to an approximateCommonly known as the value, in the signal spectrum diagram refers to the frequency range defined when the highest point of the power spectral density drops to 1/2, f0 is the center frequency, and the rectangular space occupied by the rectangular coefficient formed by the decline of 3dB around the peak is 3dB bandwidth, that is, F1-F2 in the figure below.
dB bandwidth is the bandwidth that represents when the amplifier gain drops by half.
is also called 3dB bandwidth in optical communication. The signal light transmitted in the fiber is a single longitudinal mode light, and you can think of its waveform as a parabola with an opening facing down in the X-axis (horizontal axis) -y-axis (vertical state) coordinate system0086 Does the machine answer '>10086 Does the machine answer
is not all the machine answer, is through manual, automatic voice, SMS, fax, E-mail and other ways to provide you 24 hours of uninterrupted mobile communication business consultation, business acceptance and complaints and suggestions and other professional services.
The movement of individual provinces has enabled the 10086 machine response system, and the automatic response system robot is talking to you. In short, the system stores a huge amount of information and can answer many of your questions, although the answers are not 100% accurate.
Hello, "Little e robot" means: intelligent response function. At present, the function is divided into three categories: SMS intelligent response function, portal intelligent response function and Feisin intelligent response function.
Now dialing 10086 is still retained manual service, if you dial the first to enter the intelligent voice should still need manual service, can be on the machineThe operator says "manual service" and can transfer to the manual service after confirmation.
automatic reply robot is only opened in individual provinces and cities, and most of the 10086 places do not have this automatic reply robot. To find out if 10086 in your area has this auto-reply bot, all you need to do is send 10086 a text like "Who are you?" "I love you." "I'm hungry." Or something like that, and then look at 10086's reply.