Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Data rates in PSTNs:
A voice channel in a PSTN is band limited with a nominal bandwidth of 3.1 kHz. A first-cut estimate of this can be attained from Nyquist's theorem that applies to noiseless channels and states:
R = 2H log V bps
Where
R = maximum data rate H = bandwidth of the channel V = number of discrete levels in the signal
For a 3-kHz channel and a binary signal, maximum data rate works out to be 600 bps, if channel is ideal. In a practical channel, maximum rate would come down. By increasing number of levels used to signify the signal, bit rate can be increased arbitrarily in a noiseless channel. It is significant to recognize that actual number of signal transitions is still limited to binary level limit; effective bit rate goes up with more than twosignal levels as each signal level can nowsignify a group of two or more bits. Maximum rate of signal transitions which can be supported by a channel is called symbol rate or baud rate. In a channel where noise is present, there is an absolute maximum limit for the bit rate. This limit arises as the difference between two signal levels becomes comparable to the noise level when number of signal level is increased. Claude Shannon extended Nyquist's work to case of noisy channels affected by thermal or random noise. Shannon's result defines;
R = H log (1+S/N)
Where R= the maximum bit rate obtainable
H= bandwidth of the channel
S/N = signal to noise ratio.
Normal 0 false false false EN-IN X-NONE X-NONE MOTOR CONTROL
Q. Consider an RL series circuit excited by (a) v(t) = 20e -2t V, and (b) v(t) = 20 V. Determine the forced component of the voltage across the inductor for R = 2 and L = 2H.
Problem (a) Give an example of a power signal and one example of an energy signal. (b) Given a periodic signal x (t) = A sin (2Bft). Calculate the power Px. (c) Diffe
how does the kb come across the sheet charge in the amperian sheet?
If a television station operates on UHF channel 20 (band 506-512 MHz), determine the station's visual-carrier frequency.
Explain the Synchronous Compensators These are synchronous motors running without mechanical loads (or with load if required). Similar to the synchronous generators, they can a
Explain CWD instructions in 8086 family with example and their effect on flag. Convert signed word to signed double word: CWD instruction enlarges the sign bit of a word int
Hi there, My project title is grid connected hybrid pv-wind power system. For this topic, i need a specification of the system. For this system a matlab and homer software simulati
FIGURE shows a pneumatic circuit diagram used for air supply and exhaust in an automatic control system. (a) Name all symbols (including pipelines) used in the system. (b) N
modes of operation of 8255
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd