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Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: Aug 26, 2015  |  Closed  |   5 Proposals
I am putting together a team to develop a new audio fingerprinting solution which will be designed to scale nicely in the cloud as well as have advanced features such as the ability to detect matches in short noisy samples which may also be at different pitches. We have a working design however need help in completing the development. We are looking for someone who is skilled using FFT for signal processing and after helping test out the pilot version using Matlab would be able to build using C++. The job is being reposted due to the selected developer being ill.
Category: Software Application       
Skills: C++, MATLAB, dsp, fft       

c****any
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| c****any
|    United Kingdom
Fixed Price: $500 - $1,000   |  Posted: Aug 02, 2015  |  Closed  |   11 Proposals
We are working on a project that will work with audio live. We are using a rpi with a multi channel sound card. 2 inputs and 4 outputs. We will be using fft to create reactive lighting. 2 outputs are regular audio outputs and the other 2 outputs control the laser galvo. We already have a prototype, but we need some help programming. At the moment we are having trouble timing the changing of colors (we have a rgb laser) and the movement of the galvo because of multithreading and the latency of the audio callback function. At the moment we are not working with ALSA directly, but we are using a library that uses ALSA. We believe we can lower latency time if we can write our own code to communicate with ALSA. Some of this may be over your head. We have the hardware side pretty much done. If you don't get something, don't worry we can help you understand. Anyone with experience/knowledge of ALSA, please contact us asap. Thank you in advanced.
Category: Other IT & Programming       
Skills: C, C++       

7****777
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| 7****777
|    United States
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: Jul 27, 2015  |  Closed  |   7 Proposals
I have a small C/C++ program (approximately 800 lines of code including the FFT algorithm) that inputs a string of data and makes some calculations on the data. One of the core calculations is an FFT that creates the frequency response as an output of the Fourier Transform. My knowledge of C / C++ is rather limited, but I have been able to develop the program to the point where I can get the frequency response and other parameters that I need. My challenge is that I cannot convert the frequency response into the complex notation (i.e. 1 + 0j) that I believe I need in order to calculate the angle of the frequency response (atan2(imag, real)) in order to obtain the phase or more importantly group delay of the frequency response. I have developed the identical code in MATLAB and know exactly what the correct values should be but am unable to use complex<float> or the appropriate C code to achieve complex values in C. I believe that the conversion should be straight forward fo...
Category: Software Application       
Skills: C, C++       

****
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| Client
|    United States
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: Jul 26, 2015  |  Closed  |   5 Proposals
Seeking a feasibility assessment and prototype. Have a collection of high resolution flatbed optical scans (10G each) of Soundscriber (phonograph like) disks, 4 inches in diameter. Want program to convert them into mp3. Low resolution photo attached. One approach may be to use existing libraries end to end, alternatively would it be possible to to use a library to trace the "path" spiral, and assign blocks a frequency average using fft, to give a time series file of freq, and then convert that into audio through interpolation/smoothing? Propose something. Seems doable.
Category: Other - Data Science       
Skills: Audio Restoration, Image Processing       

****
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| Client
|    United States
Fixed Price: Not Sure   |  Posted: Jul 19, 2015  |  Closed  |   2 Proposals
Active Filter using Fourier analysis in frequency domain: Reference signal estimation in frequency-domain (using FFT) ?The harmonic components of the captured voltage/current signal are first separated by eliminating the fundamental component. ?Inverse Fourier Transform is then applied to estimate the compensation reference signal in time domain
Category: Other IT & Programming       
Skills: .NET Compact Framework       

r****deo
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| r****deo
|    Trinidad And Tobago
Fixed Price: Less than $500   |  Posted: Jul 08, 2015  |  Closed  |   15 Proposals
My app is now ready and I need an appealing screencast for the App Store. it deals with a chromatic guitar tuner, and the video should show the following features: 1) Sound capturing and switch from FFT to Autocorrelation view (graph), 2) changing of theme by configuration menu 3) maybe (if it makes sense) showing the first page of the integrated user manual. I would prefer that the app preview video is integrated into a (virtual) iPhone device, so it looks nicer and more professional. Background music would be appreciated - there's no need that the user hears the sound of a guitar. Test Flight: this version of my app is still not on the App Store, so I can't provide promotion keys yet. I need s.o. who can download and run the app as beta tester - test flight. Test environment as this app deals with sound processing, screencast should be made by a real iPhone and NOT by the simulator. The simulator crashes when it deals with sound capturing! Please take into account that there ar...
Category: Videos       
Skills: Animation, Video Editing, Video Production       

u****ock
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| u****ock
|    Germany
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: Jul 04, 2015  |  Closed  |   6 Proposals
We are going to use OpenSL to listen from device microphone and put raw data to a circular buffer. Our goal is to do some signal processing on the raw data, we need to do calculation for few functions simultaneously, for example we need to do FFT with different window sizes at same time, calculating SPL, SIL, EQ and other acoustic functions while we save raw data (saving cloud be done on NDK or Java side) for further analysis. The job is to write an OpenSL library that opens device microphone(s), and start recording raw data into a circular buffer where other native threads could read from there. Also it should returns complete status about device, such as maximum sampling rate, OpenSL low level events, etc. Raw data in circular buffer should has time stamp label, in order to detect missed frames or buffer overflow. Your deliverable project should be in sample Android app which one native thread reads from circular buffer and save it on the disk or do a very simple calculation ov...
Category: Software Application       
Skills: Android NDK, OpenSL       

C****ing
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| C****ing
|    Norway
Fixed Price: Not Sure   |  Posted: Jun 30, 2015  |  Closed  |   9 Proposals
Hello all bidders, We are looking for a developer to join our team and help create a small but interesting sound FFT code that will be integrated into our system. The code eventually needs to be written in C,C++, objective-C or anything else that can be integrated into iOS/Android. Our electronic device will send ultrasound tones (17-20khz), you will need to filter out the surrounding noise and identify the tone frequency. For the development process we will provide the sample WAV file. A very rough method to do this would be to maintain a rolling average of the values for certain frequencies (FFT bins), and if a new value is much larger than the average, it's likely to be a tone. There are better ways however, that involve more precise measurement of the background noise, and calculate the signal to noise ratio. The end result should be a small API/BlackBox for 5-10 different pre selected identified frequencies. The logic: we take the ultrasonic ranges of 17000hz-19500hz and de...
Category: Mobile Applications       
Skills: Android, iPhone App Development       
Preferred Location: North America, Western Europe, Eastern Europe

****
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| Client
|    Israel
Fixed Price: Less than $500   |  Posted: May 19, 2015  |  Closed  |   2 Proposals
I want to develop a spectrum analyzer board based on MSP430 MCU from TI. Specifically, I have a MSP430 F5529 LaunchPad. I think MSP430F5529 is a right MCU for my purpose. I found a code reference even though it is only 32-point FFT.   [obscured]  /index.php/Real-Time_Audio_Spectrum_Analyser#16-bit_FFT You can refer to the code reference and modify it to expand its capability to 128-point, operating on the MSP430F5529. It will have 'Nokia 5110 LCD' to display its result. You can find all the information of the LCD in   [obscured]  /products/10168 . Because it has 84-pixel width, 35% of span will be clipped out on the LCD. That's okay. The file attached is just a board reference I'm bench-marking.
Category: Software Application       
Skills: C       

W****m88
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| W****m88
|    Korea, Republic of
Hourly Rate: $15 - $30 / hr   |  Duration: 3-4 weeks  |  Posted: May 19, 2015  |  Closed  |   1 Proposal
Continue to update LabVIEW VI's to enhance current test shell project that communicated using IP to a PDL that streams JSON RESTful data and plots cache and logged ADC data files, including sending or posting JSON commands to change the parameter of the PDL. Most of the test shell is finished but new features include the handling of new data formats being sent form the PDL such as Gzip, binary format changes, JSON meta information changes, and future FFT or related analysis, including the ability to import log files from PC and not stored on PDL's SD card. Other possible changes include showing the RTD temperature sensor data and updating the real-time clock.
Category: Software Application       

w****son
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| w****son
|    United States
Fixed Price: Not Sure   |  Posted: May 05, 2015  |  Closed  |   1 Proposal
I need you to create a Windows Phone (Tablet App) that gathers sensor data from one of these: Accelerometer, Gyrometer (preferred - plotting angular velocity/displacement vs time), Microphone (plotting the Fundamental Frequency using FFT(Fast Fourier Transformation) vs time), Pedometer (if available in tablets) And in real-time or close to real-time it streams the data to PowerBI (the graph updates itself).
Category: Mobile Applications       
Skills: .NET Framework, C#, Windows Phone       

a****man
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| a****man
|    United States
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: Apr 29, 2015  |  Closed  |   6 Proposals
Hi, I am trying to build a cycloconverter using matlab. The circuit i have grabs a sine wave and using thyristors and switches, makes the output frequency larger or smaller. I currently using MATlab and simulink. Where I am having problems, is the filtering part. I need someone to show me how to filter the output using harmonics/FFT in order to make my output signal a nice sine wave. Should be an easy task but i am still unfamiliar with FFT anf filtering harmonics and i want someone to show me how it works using simulink and filters. I need to figure this out today so whoever is willing to work with me today, I will reward the job to them .
Category: Electrical       

r****p21
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| r****p21
|    United States
Fixed Price: About $20   |  Posted: Apr 23, 2015  |  Closed  |   0 Proposals
It is an engineering academic assignment. The attached document has information on the assignment. You are required to compute the gravity effects of buried cylinder, then compute FFT for the time-travel signal and IFFT.
Category: Other - Engineering &...       
Skills: Manufacturing Design, Electronics, ISO 9001       

m****ing
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| m****ing
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: Mar 16, 2015  |  Closed  |   5 Proposals
Looking to develop a simple program to re-organize and re-code string variables into numerical values and automatically compute FFT.
Category: Other IT & Programming       

m****op1
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| m****op1
|    Canada
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: Mar 09, 2015  |  Closed  |   3 Proposals
Given a 16 bit x 1024 signed signal array in the time domain and an x time index, select a 256 point sample area (based on the given time index, x cycles to the left and x cycles to the right), perform an interpolation using padding and FFT (methods to be recommended by candidate and discussed with poster) and populate 1024 point output array. Memory is tight, so we may just allocate temp storage on the stack in the routine and place the generated array in the source array location. The input to the interpolation routine will be 256 points of 8 samples per cycle, the resulting output array will be 1024 points of 32 samples per cycle. C Prototype: void Interpolate(short *InputArray, short *OutputArray, unsigned short Size, unsigned short PeakIndex) Familiarity with Kinetis K60 DSP instructions helpful (ARM Cortex M4) I am expecting this to be approximately 1 man day of work (to be discussed with candidate). If all goes well there are more tasks at hand pending signing of NDA. Wh...
Category: Other IT & Programming       

J****eca
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| J****eca
|    United States
Fixed Price: $50 - $100   |  Posted: Mar 03, 2015  |  Closed  |   5 Proposals
implementation of size N=6*5^4 FFT using the GPFA in the attached document: Temperton_1992.pdf Need to use n=6 case in the attached document (page 16) Temperton_1983.pdf. Provide calculations of number of (real) multiplications and additions based on the code produced matching 1983 document page 18 formula. Also the size of the weight/twiddle arrays should match the quoted number on the 1992 document. C code should use floats only and all index calculations should be explicit, no recursion allowed. Test vectors produced by Matlab will be provided (complex in, complex out of size 6*5^4 ie 6*625) which the produced C code should match within a specified limit of 1e-8.
Category: Data Engineering       
Skills: C, FFT       

****
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| Client
Hourly Rate: Not Sure   |  Duration: 1-3 months  |  Posted: Feb 19, 2015  |  Closed  |   65 Proposals
We have an existing website based on LAMP. Need to integrate into this site for various data elements. The current "stem" android app doesn't offer enough and doesn't go far enough to service the users. ("FFT Connect" is the current stem found on Google Play) I'm open to using a "template" for the first round as long as it has the right features. See this article:   [obscured]  /4901-best-app-makers-creators.html Some of the features that will need to be in this app in addition to what ideas you might have in mind to contribute: - status updates - post images and videos - comment on and "like" status updates, posts and images and videos - communicate with family (like you'd communicate with "friends" in Facebook or "coworkers" in LinkedIn) - find family / suggest family from other data (social or contacts on phone) - have a profile page - see lists of family members having birthdays today and in the near f...
Category: Mobile Applications       

C****err
 [?]
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| C****err
|    United States
Fixed Price: Less than $500   |  Posted: Jan 31, 2015  |  Closed  |   10 Proposals
We have a Unity app that currently accepts user input through the user pressing one of four onscreen buttons. Another eLancer has built us a hardware device that will provide signals from physical hardware buttons via the mobile device's microphone jack. We need: 1) Compile our Unity app for the Galaxy Note 4 (it is working on the Galaxy Nexus, but is crashing on the Note 4). 2) Update our Unity project to add support for the input from the voltages sent via the microphone jack to supplement the inputs from the onscreen buttons. (Each onscreen button will have a corresponding hardware button/voltage.) 3) The hardware input should read the voltage on the line when initialized and normalize the voltages of the buttons accordingly, in case the input voltages fluctuate slightly as batteries in our hardware drain. The Unity project will be provided, as will the hardware diagram. We will likely have to do a round or two of iteration/debugging to ensure your code works with our hardw...
Category: Mobile Applications       
Skills: Android, Unity, Mobile App Development       

m****ast
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| m****ast
|    United States
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: Jan 23, 2015  |  Closed  |   11 Proposals
Input signal either from internal microphone or external audio devices Display realtime FFT spectrum Adjust sample rates and window Pinpoint individual frequencies with a cursor and show harmonic values Save and email data as png images, csv and wav formats Playback wav files You can check a similar app SignalScope Please give an approximate time period for finishing this app Job Description: We are looking for a talented Mobile Application Developer who will be responsible for the design, development and deployment of our mobile apps. Your responsibilities: - Review and perform a technical analysis of requirements - Produce a solid, detailed technical design - Write clean, modular, robust code to implement the desired requirements - Contribute ideas for making the application(s) better and easier to use
Category: Mobile Applications       

c****def
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| c****def
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: Dec 10, 2014  |  Closed  |   3 Proposals
Looking for someone with experience or ability to run FFT on an 8051 uC with an IAR license. There is more work where this came from but it needs to happen today.
Category: Other IT & Programming       
Skills: C, Embedded C, 8051, fft       

O****eIt
 [?]
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| O****eIt
|    Netherlands
Fixed Price: Less than $500   |  Posted: Dec 02, 2014  |  Closed  |   4 Proposals
Im looking for privet tutor for DSP unit in these topics : 1- Discrete-time Signals and Systems. 2- sampling and reconstruction. 3- Fourier Transform Family. 4- Discrete Fourier Transform. 5- Fast Fourier Transform and FFT analysis. 6- Z Transform. 7-Transforrm analysis of LTI system. 8- System Structures and Implementation. 9- FIR Filter Design. 10- IIR Filter Design. see the attachment.
Category: Other - Engineering &...       
Skills: Digital Signal Processing       

a****ece
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| a****ece
|    United Kingdom
Fixed Price: Less than $500   |  Posted: Dec 02, 2014  |  Closed  |   7 Proposals
The bit error rate (BER) performance using the discrete fractional Fourier transform (DFRFT) instead of the convenient fast Fourier transform (FFT). The code has to compare betwwen the BER performance of FRFT & FFT based OFDM using analytical and simulation curves.
Category: Other IT & Programming       
Skills: MATLAB       

****
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| Client
|    India
Hourly Rate: Not Sure   |  Duration: 4-6 months  |  Posted: Dec 02, 2014  |  Closed  |   11 Proposals
We have a requirement of Verilog programmers with DSP back ground in RF applications. The job is to carry out multirate digital signal processing in wideband data acquired by a RF capturing ADC. It will involve designing and programming of 1. FFT 2. Filters 3. Multiple DDC's 4. Control of the device More details can be provided to you after first contact.
Category: Other IT & Programming       

A****abs
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| A****abs
|    India
Hourly Rate: $40 - $50 / hr   |  Duration: 1-3 months  |  Posted: Nov 25, 2014  |  Closed  |   8 Proposals
DMT builds radar. Our security radars are used to protect large areas of land and sea. Each radar has an internal CPU that runs and application. We call this the Radar Server. The Windows-based Radar Server: * communicates with the remote clients; * executes many algorithms, such FFT's, filters, and tracking; * controls the radar motors and A/D boards; * communicates with an onboard GPS. The application was written using Visual Studio.NET and is primarily in C# and VB. The application was originally written in 2002 in Framework 2 and has been migrated over the years to Framework 4. This project requires the consultant to optimize the current radar server version, document it, general clean up as is required by removing unused routines and variables, and to include a new, robust error handler. The consultant may wish rebuild the application from scratch. All bidders must live with 80 miles of Sterling, VA. Regularly meetings will be held at DMT's Sterling office with i...
Category: Software Application       
Skills: .NET Framework, TCP/IP, VB.NET, C#, System Programming       

D****dar
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| D****dar
|    United States
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