topic Re: LPC1769 audio Processing in LPCXpresso IDE

LPC1769 audio Processing

lpcware — Wed, 15 Jun 2016 22:13:27 GMT

Content originally posted in LPCWare by furkan.yuksel on Fri Aug 05 01:10:20 MST 2011
Hi,

I'm using LPC1769 for sampling and transferring audio. However, I have annoying noise with my audio signal. So, I thing I can do some audio processing with my MCU to get more precise data.

However, I'm not pro. in signal processing and even I know how it may take so much time to write codes for this purpose.

Thus, what I'm asking is, are there any bunch of codes which can help me to process my audio data?

Thanks in advance.

Best Regards,

Furkan Yuksel

Re: LPC1769 audio Processing

lpcware — Wed, 15 Jun 2016 22:13:28 GMT

Content originally posted in LPCWare by Rob65 on Fri Aug 05 02:07:36 MST 2011
Need more input ...

this is not enough information to be able to help you.

What kind of noise?
Is the noise in the analog signal or is it introduced during A/D conversion?
What hardware are you using?

Have you checked the support documents at ics.nxp.com ?
There you will find AN10913 "DSP library for lpc1700 and lpc1300" with an efficient implementation of a FIR filter. It also contains FFT and DFT algorithms that are very usefull to anaylze your digitized signals.
You may benefit from reading AN10943 "Decoding DTMF tones using M3 DSPlibrary FFT function" on that same page.

Search Google for "FIR Filter" there are a number of nice websites that can help you with the creation of the FIR filter coefficients.

Regards,[INDENT]Rob
[/INDENT]

Re: LPC1769 audio Processing

lpcware — Wed, 15 Jun 2016 22:13:28 GMT

Content originally posted in LPCWare by furkan.yuksel on Fri Aug 05 02:38:24 MST 2011
Ok Rob,

Thank you, I just needed to know whether it hos DSP library and I could not find it. İt ok now I'll try to find what kind of FIR filter I need to use :)

Thank you,

Best Regards,

Furkan