Dear Guest, Please Register to Download Free Seminar Reports and PPT of each topic. The Download link will be visible only after the registration.Please search the topic before posting.

Please click the Facebook Like Button if you are satisfied

 Subscribe To Get Latest Seminar Reports and PPT

Receive all seminar updates via Facebook. Just Click the Like Button Below


ece seminar topic

Huge Collection of Electronics Seminar Topics, Reports and PPT.

ece seminar topic

Postby sgkug » Thu Mar 01, 2012 5:25 pm

plz upload the above mentioned seminar topic's full report.
thank you.
Posts: 1
Joined: Thu Mar 01, 2012 5:16 pm

Re: ece seminar topic

Postby Prasanth » Fri Mar 02, 2012 3:06 pm

One of the most wide spread applications of adaptive filtering is adaptive noise cancellation. The basic prerequisite for this realization is the availability of the two inputs called primary and reference. The primary signal consists of speech s(n) plus noise n1(n) while the reference signal consists of noise n(n) alone. The two noise signals n1(n) and n(n) are correlated and hi(n) is the impulse response of the noise path from the noise source to the primary microphone. Assuming that the signals are discretetime and the sampling period is T=1, the primary input can be written as

xp(n) = s(n) +n1(n) …………. (1)

where speech signal s(n) and noise signal n1(n) must be uncorrelated

As mentioned in the introduction, the specific features of the noise in some speech processing applications suggest the usage of narrow-band notch filters. They have to meet the following requirements:

• To adapt as fast as possible to the changes in the noise which might be quite rapid, for example car engine noise;
• The cancelled portions of the spectrum should be as narrow as possible in order to prevent speech signal distortions.

Both requirements could be met much easier using IIR adaptive filters instead of FIR adaptive filters. IIR filters are usually avoided because they create a lot of stability problems. To overcome this problem we use a realization based on second order Gray-Markel lattice circuit. Using this circuit it becomes possible to implement a second order notch/bandpass section Fig. 3.The advantages of such a realization are first, it has extremely low pass band sensitivity that means resistance to quantization effects. Second, it is very convenient for realization of adaptive notch filters because it is possible tocontrol independently the notch frequency and the bandwidth
You do not have the required permissions to download the files attached to this post. You must LOGIN or REGISTER to download these files.
User avatar
Site Admin
Posts: 488
Joined: Sat May 28, 2011 6:29 pm

Return to Electronics Engineering Seminar Topics