# Tag Info

Accepted

### How do software equalizers work?

This depends a lot on how you implement it. A single biquad takes about 10 arithmetic operations. (To be precise a Transposed Form II takes 4-5 multiplies and 3 adds, depending on how the gain ...
• 31.4k

### Adaptive equalizer for IIR channel?

Note that the inverse of an FIR system is IIR, and the same is true for the inverse of an IIR system, unless it is an all-pole system, the inverse of which would be FIR. So in most cases the ideal ...
• 80.2k
Accepted

### Given an FIR filter coefficients, how can I find coefficients of its equalizer filter?

Assuming that you also want to equalize the filter's phase response (not only its magnitude response), you need an equalizer with a transfer function $E(z)$ that is the inverse of the FIR filter's ...
• 80.2k

### How do software equalizers work?

I don’t think you’re alone, but essentially this is simply a problem of optimization. Let’s say you have a processor with a 88MHz clock. That’s 2k clocks per sample at 44kHz. If we take the term ‘...
• 1,028
Accepted

• 657

### Does an audio equalizer consist of a perfect-reconstruction filterbank?

A filter bank system is generally composed of: an analysis filter bank, that split an input signal into components with filters and may reduce their rate a synthesis filter bank (FB), that takes the ...
• 29.9k
Accepted

### Calculate Q factor of a Low Shelf and High Shelf filter

it looks like this eq10q uses cascaded parametric EQs, initially set up to be bell, but switchable to other types (like shelving). i wouldn't doubt that they're using the audio EQ cookbook. if you'...

### Viterbi equalizer in a GSM system

Thanks for the answer. You are correct - the training sequence is known by the time you establish any communication. In case if somebody stumbles upon this in the future, here's how to get this done: ...
• 61
Accepted

### Distortion of OFDM signal when using RRC filter

I checked your code in my PC, you need just to delete the delay added before the filter. For example, you can use: U_aft_fil = U_aft_fil(fil_delay+1:end); Then ...
• 1,046
Accepted

### where we use estimation and detection in communication system?

Don't worry too much about defining these terms too precisely, because they are used in many contexts with slightly different meanings. In very general terms, "estimation" is the calculation ...
• 13.8k
Accepted

### Requirements on Signal Spectrum for Fractionally Spaced Equalization

As far as equalizer performance and possible limitations I provide two key points below about the span of the equalizer and the number of samples per symbol to use. The equalizer duration in time is ...
• 37.1k
Accepted

...
• 720

### Viterbi equalizer in a GSM system

From the referenced description and also from [1] it seems to me that the training sequence (here: midamble) is assumed to be known already. This knowledge has probably been acquired before in the ...
• 4,071
Accepted

### On the application of chaos in signal processing

A typical communications system is composed of the following parts: ...
• 10.1k

### Equalize Speaker using impulse response

This depends a bit on what you want to get out of this and how much effort/work you are willing to put in. Doing a room EQ that actually works and makes it sound consistently better is quite ...
• 31.4k

### Does an audio equalizer consist of a perfect-reconstruction filterbank?

Does an audio equalizer consist of a perfect-reconstruction filterbank? Short answer: No. It's a bit unsharp what you're asking here, since reconstruction filterbanks are usually things that combine ...
• 26.1k

• 80.2k
1 vote
Accepted

### Equalizer coefficients and channel coefficients

With a blind equalization technique like the constant modulus algorithm (which is often implemented using a least mean squares (LMS) filter as you indicated), you aren't directly estimating the ...
• 23.7k

Only top scored, non community-wiki answers of a minimum length are eligible