By Jerry D. Gibson
For greater than six years, The Communications guide stood because the definitive, one-stop reference for the whole box. With new chapters and large revisions that mirror contemporary technological advances, the second one variation is now poised to take its position at the desks of engineers, researchers, and scholars round the world.
From basic thought to cutting-edge purposes, The Communications guide covers extra parts of forte with higher intensity that the other guide available.
* Telephony
* verbal exchange networks
* Optical communications
* satellite tv for pc communications
* instant communications
* resource compression
* information recording
Expertly written, skillfully awarded, and masterfully compiled, The Communications instruction manual presents an ideal stability of crucial info, history fabric, technical information, and foreign telecommunications criteria. no matter if you layout, enforce, purchase, or promote communications platforms, elements, or prone, you'll locate this to be the single source you could flip to for quick, trustworthy, answers.
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Additional info for The Communications Handbook (Electrical Engineering Handbook)
Sample text
3 for the case of uniform encoding as compared to α = 0, which was obtained for the ideal conditions associated with Eq. 8). 8 Example: Design of a PCM System Assume that an analog voice-frequency signal, which occupies a band from 300 to 3400 Hz, is to be transmitted over a binary PCM system. 8 kHz. , a sampling frequency of 8 kHz is the standard used for voice-frequency signals in telephone communication systems. fm Page 12 Tuesday, March 5, 2002 2:41 AM Referring to the dimensionality theorem [Eq.
Where xp(t) is the periodic train of rectangular pulses with fundamental period Ts, and each rectangular pulse in xp(t) has duration d and unit amplitude [Fig. 4(b)]. Observe that the sampled signal mns(t) consists of a sequence of pulses of varying amplitude whose tops follow the waveform of the signal m(t) [Fig. 4(c)]. 20) n=−∞ from which we see that the effect of the natural sampling is to multiply the nth shifted spectrum M(ω − nωs) by a constant cn. Thus, the original signal m(t) can be reconstructed from mns(t) with no distortion by passing mns(t) through an ideal low-pass filter if the sampling rate fs is equal to or greater than the Nyquist rate 2fM.
2, this corresponds to the input traversing the range −V to +V volts where V = 8 V is the design level of the quantizer. 7) was derived for waveforms with equally likely values, such as a triangle waveshape, that have a peak-to-peak value of 2V and an rms value of V/ 3 , where V is the design peak level of the quantizer. From a practical viewpoint, the quantizing noise at the output of the PCM decoder can be categorized into four types depending on the operating conditions. The four types are overload noise, random noise, granular noise, and hunting noise.