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!
In implementing an FFT algorithm, it is sometimes useful to generate the powers of WN with a recursive difference equation, or oscillator. In this problem we consider a radix-2 decimation-in-time algorithm for N = 2ν . Figure 9.11 depicts this type of algorithm for N = 8. To generate the coefficients efficiently, the frequency of the oscillator would change from stage to stage. Assume that the arrays are numbered 0 through ν = log2 N, so the array holding the initial input sequence is the zeroth array and the DFT is in the vth array. In computing the butterflies in a given stage, all butterflies requiring the same coefficients Wr N are evaluated before obtaining new coefficients. In indexing through the array, we assume that the data in the array are stored in consecutive complex registers numbered 0 through (N - 1). All the following questions are concerned with the computation of the mth array from the (m-1)st array, where 1 ≤ m ≤ ν. Answers should be expressed in terms of m.
(a) How many butterflies must be computed in the mth stage? How many different coef- ficients are required in the mth stage?
(b) Write a difference equation whose impulse response h[n] contains the coefficients Wr N required by the butterflies in the mth stage.
(c) The difference equation from part (b) should have the form of an oscillator, i.e., h[n] should be periodic for n ≥ 0. What is the period of h[n]? Based on this, write an expression for the frequency of this oscillator as a function of m.
An electric pencil sharpener is rated 240 mW, 6 V is connected to a 9-V battery and a series-dropping resistor Rx needed to power the sharpener. Calculate the value of the series-dropping resistor Rx needed to power the sharpener.
A certain voltage is + 14.7 V for 24.8 ms and -14.7 V for the succeeding 24.8 ms and continues oscillating back and forth between these two values at 49.6 ms intervals. The voltage is present across a 64 resistor.
What is the smallest integer number of time constants required for an exponential to decay to less than 10 percent of its initial value what percentage of its initial value is it at this time
A causal LTIV discrete-time system is described by the difference equation: y[n] = 0.4y[n - 1] + 0.05y[n - 2] + 3x[n], where x[n] and y[n] are, respectively, the input and the output sequences of the system. Determine the transfer function H(Z) of ..
A uniform plane wave propagating in a medium and find α, β, and H→
the pep transmitted by an acssb system is 140 w. it uses an ne571n compandor lic. calculate the power transmitted
What is a programmable logic controller (PLC) - Identify four tasks in addition to relay switching operations that PLCs are capable of performing.
A 120 V(rms), variable frequency source is connected in series witha 100 ohm resistor and a 100uF capacitor . Find the input power to the cirtcuit from the source at th frequency where the power factorof the load is 0.75
Compare the result with Figure 3.29 and comment on your observations.
The distribution line connecting the source to the load has negligible impedance. Load 1 is purely resistive and absorbs 60 kW. Find the per-phase impedance of load 2 if the line voltage is 415.69V(rms) and the impedance components are in series.
Determining the o/p level from an attenuator of know i/p, An attenuator has an attenuation of 10 dB over the frequency range 10 MHz to 1.0 GHz
Several of the voltages associated with certain circuit are given by V12 = 9 phase angle 30 degrees V, V32 = 3 angle 130 degrees V, and V14 - 2 angle 10 degrees V. Determine V21, V13,, V34 and V24
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd