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Fixed Price: $1,000 - $5,000   |  Posted: Nov 30, 2015  |  Closed  |   10 Proposals
Narbis Attention Brain Training Estimated 50 hours of work. Required Experience: ? Android/Java ? BT4.0 BLE Connectivity ? JNI - Java Native Interface ? C/C++ ? DSP - Digital Signal Processing ? FFT - Fast Fourier Transform ? Reward Threshold: Dynamic Threshold, SMA (Simple Moving Average), Static Threshold ? Fuzzy Logic experience is preferred but not required Description App is used to measure EEG data from the brain and process the data using some predefined protocol to provide live feedback on the brains performance (see:   [obscured]  /wiki/Neurofeedback) See our product narbis.com Please see 'User Guide' in included directory to understand current version software operation and functionality. Below resources are available upon request: SDK available for demo app operation upon request. See included 'BlockDiagram' PDF which generalizes the software process flow. See 'Training Metrics' for description of how user performance is calculated. See 'Current App Scr...
Category: Mobile Applications       
Skills: C, Android, Java, Digital Signal Processing       
Preferred Location: United States

s****trg
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| s****trg
|    United States
Fixed Price: $650 - $1,000   |  Posted: Nov 24, 2015  |  Closed  |   17 Proposals
We are looking for a light/clean, well-laid-out infographic to help inform our audience (subscription business owners) about subscriber churn; what it means, how to calculate, and how it can drastically affect their business's financial projections. Attached is a loose wireframe which outlines the content of this Churn infographic. The overall layout is entirely up to you-- as long as each section is clearly defined and the over-arching aesthetic is consistent. A previous infographic we've sourced to be created can be found here:   [obscured]  /s/cumrxelpi2n83nz/start-subscription-infographic.jpg?dl=0 --We're definitely looking for higher-quality design work, with this next infographic. Design requirements: Use Open Sans for all typography:   [obscured]  /fonts/specimen/Open+Sans Cratejoy logo:   [obscured]  /s/5ly5pbxlmtzralw/Cratejoy-logo.svg?dl=0 Cratejoy icon:   [obscured]  /s/mr6fzgr519fft76/CJ-Crate.svg?dl=0 General Color palette: https:...
Category: Graphic Design       

T****_CJ
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| T****_CJ
|    United States
Fixed Price: Less than $500   |  Posted: Sep 29, 2015  |  Closed  |   8 Proposals
We Need a mathematically sound programmer who has knowledge of C# and windows forms, Threading and Timers, we are trying to finish a major project and now it needs the last component....this is not to advance for the highly skilled programmer....The Price may Change according to new specifications and the design documents.Who is also willing to co write this application and Make it Excellent...Communication will be done via skype or cryptocat and the design documents will be encrypted and will only be opened to the winning developer... prerequisites you need to finish this Job 1. Calculus 1 2 and 3 2. Physics 3. C# 4. Radio Communication Knowledge 5.Signal Analysis Knowledge There will be a design document and future work for upgrades This is basically an interview for future work Since the nature of this project is sealed - a letter of intent and privacy non-disclosure will need to signed..... upon the winning developer bids
Category: Software Application       
Skills: .NET Framework, CSS, HTML5, C#, Windows Forms       

w****014
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| w****014 *
|    United States
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: Sep 05, 2015  |  Closed  |   18 Proposals
IMPORTANT: I have had to repost this twice now due to freelancers letting me down and simply stringing me along and the delays have cost me dearly. So please ensure before you bid that you can do the following: 1. Start quickly 2. Work fulltime or at least a decent number of hours 3. Have the necessary skills to extract the top 5 frequencies using fft from a 1 second sound sample. 4. Write in a fast language eg C++ or C. 5. Sign agreement which covers confidentiality and assignment of any work created to my company. I am happy to pay more for the right freelancer who delivers and works quickly. 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 ...
Category: Software Application       
Skills: C++, MATLAB, dsp, fft       

c****any
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| c****any
|    United Kingdom
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
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
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