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Given a base frequency of 50Hz, which will include 'normal' harmonics (e.g. 100, 200Hz), we need to detect an embedded 58 Hz frequency. The 58 Hz may be as much as 70dB below the base frequency.

We require a C function (standard C) to run on an ARM processor which will take a pointer to an array of ADC values (14 bit integers justified to 16 bits), perform an FFT of your choice and write the relative amplitudes (rms values) back into the array.

The whole project can be developed on a PC BUT bear in mind, no system calls to the OS (we'll need to port it), typical RAM constraint will be 32K and most importantly no floating point processing (!). Real time updating in the order of once every 0.5 sec, so plenty of processing time available (at 50 Mhz).

The same scenario will be needed for 60Hz, 120 Hz and 380 Hz.

In a nutshell we need a spectrum analyser from say 40-400Hz with a few particular frequencies of interest (58 Hz, 68 Hz etc).

Kemahiran: Pengaturcaraan C

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Tentang Majikan:
( 0 ulasan ) Christchurch, New Zealand

ID Projek: #350050

Dianugerahkan kepada:


sounds easy

$750 USD dalam 4 hari
(1 Ulasan)

10 pekerja bebas membida secara purata $610 untuk pekerjaan ini


Pls. Chk PM

$750 USD dalam 15 hari
(0 Ulasan)

The coding will be in C, along with the description

$400 USD dalam 3 hari
(0 Ulasan)

I am interested.

$700 USD dalam 30 hari
(0 Ulasan)

Hi, Expert c/c++ coding/design, willing to deliver what's required and more. Kind regards

$750 USD dalam 60 hari
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Hello, can do this job. Have physic\math education, 4 years C/C++ [login to view URL] implement FFT by fixed point [login to view URL] regards, Denn

$400 USD dalam 10 hari
(0 Ulasan)

hi, I am an engineer did master in system on chip from lund university i think so i will get it done in 5 days so when to start

$750 USD dalam 10 hari
(0 Ulasan)

Hello, I have experience with fixed point math, and digital signal processing on a TI c64xx architecture. can do this in a week.

$500 USD dalam 7 hari
(0 Ulasan)

I have 4 years of programming for embedded devices based on ARM processor using C. I also have expirience in low level code optimization. Ram constraints wll be fulfilled. Can do this job in in 5 days.

$350 USD dalam 5 hari
(0 Ulasan)

Dear Sir: I am a senior research engineer with Phd degree. Frankly speaking, I do not have arm experience. However, I know many advanced algorithms of system identification and signal process. And this project ca Lagi

$750 USD dalam 7 hari
(0 Ulasan)