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If I only know that the norm operation frequency is 44.1khz,but the de-emphasis on 48.1 or 32khz.What else information should I know for the transfer function of the de-emphasis filter??Thanks for answering.
mm..I knew the cheap way is IIR. But I am new in these region.
I want to know which methods almost everyone in there region will use?IIR or FIR?
Thanks..
premphasis filter is an high pass filter(differentiator) and deemphasis is an low pass filter (integrator).by means of premphasis ,we are boosting high frequency elements where as deemphasis filter will give preference for low frequency elements.
Finally ,I think there is some std value for Time constant (RC) for each filter.
Any way ,if we multiply both transfer functions answer will be CONSTANT VALUE(let K).
reply me soon
mmm..ask a basic question....why should we use de-emphasis filter in audio codec? Should de-emphasis filter be co-worked with pre-emphais filter?Or it can be worked alone.
when the recording audio using preemphasis, the player must using deemphasis to do the recovery. It can reduce the hf noise that is nosiy to ear in analog audio recording.
mmm.
If there is no pre-emphasis filter,should it use the de-emphais filter???
why the de-emphasis filter is different with the other in different sampling rate??
If there is no pre-emphasis filter,should it use the de-emphais filter???
NO
why the de-emphasis filter is different with the other in different sampling rate??
Because what you want is to compensate to the original analog source.
So using different sample rate, the filter must be change!
>>Because what you want is to compensate to the original analog source.
>>So using different sample rate, the filter must be change!
Hello:
I still can't catch these words.Can you tell me more detailedly?
I think you have to start designing with some tools like Matlab.
If you know the analog transfer function then you should transform it to the Z domain. You can use algorithms like bilinear transform to do that.
You will get some IIR type like filter.
I made J17 preemphasis in the past with a 64 tap FIR filter. It had correct behaviour of amplitude response but because it was a symmetrical FIR it had linear phase response. I guess that implementing of correct phase response will be necessary for proper implementation.
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