Chris Moore wrote:
Please see my article AN-11. It gives a simplified method (Impulse
Invariance) of designing with first order filters:
> http://www.sevenwoodsaudio.com/AN11.pdf
Best,
Chris
Jaime Andres Aranguren Cardona wrote:
> Hello,
>
> Also, the values of b0 and b1 (or -b1, for the HPF) depend on the
> frequency response that you need to achieve. On a Signals & Systems'
> book you will find out methods to obtain them, or use MATLAB (or
> equivalent tool) to obtain them.
>
> Regards,
>
> Jaime Andr Aranguren Cardona
> j...@ieee.org
> j...@computer.org ----- Original
Message ----
> From: Amit >
> To: smartie_625
> >; a...
>
> Sent: Monday, December 3, 2007 11:36:37 PM
> Subject: Re: [audiodsp] High pass and low pass FIR filter
>
> Hi,
>
> Multiply any FIR coefficient set with this sequence [...-1, +1, -1,
> +1...] and in effect you would mirror image the frequency response of
> the filter around fs/4. In your case if [b0, b1] are the filter
> coefficients for a LPF then [b0, -b1] would translate it to a HPF.
>
> [...-1, +1, -1, +1...] is a cosine signal cos(pi*n) (Cosine wave of
> frequency fs/2 sampled at fs). Multiplying this with your FIR set would
> be equivalent to convolving in the frequency domain, which would result
> in translating the frequency spectrum of original filter by pi.
>
> Amit
>
> ----- Original Message ----
> From: smartie_625
> To: audiodsp@yahoogroup s.com
> Sent: Sunday, 2 December, 2007 5:43:59 AM
> Subject: [audiodsp] High pass and low pass FIR filter
>
> Hi,
>
> I am new to DSP. I want to design a low pass and a high pass FIR
> filter of order 2 (moving average filter) to implement the same on
> Xilinx V2P board.
>
> What will be the difference in coefficients for the low pass and high
> pass filter?
>
> To elaborate, the equation for the output is:
>
> y[n] = b0*x[n] + b1*x[n-1]
>
> What will be bo and b1 for the low pass and high pass filters?
>
> Thanks,
> Abhishek
>
>
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11:06 AM
--
-----------------------------------
Seven Woods Audio, Inc. Christopher Moore
Concepts, Products, Circuits for Audio Analog/Digital
m...@SevenWoodsAudio.com
http://www.SevenWoodsAudio.com
