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Subject: Re: GSOC application question

Re: GSOC application question

From: Laszlo Szilagyi <>
Date: Sun, 30 Mar 2008 14:25:59 +0200

On Sun, Mar 30, 2008 at 1:33 PM, Michael Sevakis <>

> Dear Laszlo Szilagyi,
> One item that has been discussed much is the implementation of a high
> quality resampler for the Rockbox DSP. While the linear interpolation
> algorithm is fast and perhaps nescessary to use in certain circumstances
> for
> certain CPU-hungry codecs such as the SPC emulator, most find it less than
> satisfactory in general for reasons I have no doubt you understand.
> Rockbox needs a better resampler than that is both frugal on CPU cycles
> (this can depend on the target's processing power) and qualifies as
> high-quality output.
> Your qualifications and interests indicate you would be a good candidate
> for
> this project. It would be great if you would consider it as a possibility.
> Sincerely,
> Michael Sevakis (jhMikeS)
> ----- Original Message -----
> From: Laszlo Szilagyi
> To:
> Sent: Sunday, March 30, 2008 5:16 AM
> Subject: GSOC application question
> Dear Rockbox!
> I'm an electrical engineer student in my 4th year from Hungary (BUTE),
> studying mainly about embedded system design, digital signal processing,
> and
> of course the programming tools in connection with these fields. I've
> heard
> about the "Google Summer Of Code", and the projects Rockbox offers caught
> my
> attention. As my main specialization is digital signal processing, I'm
> mostly interested in tasks covering this field. I like the
> Realaudio Support
> DSP Plugins
> Better Video Support
> tasks at first sight, but before I send my application I would like to
> know
> if my qualification is sufficient for the various tasks. Of course I'm
> open
> to some embedded work as well, but what I really like is the DSP... :)
> My studies/experiences:
> - programming in C/C++ language (in C++ I'm familiar with STL, and design
> patterns, used doxigen)
> - DSP knowledge: mathematical fundamentals, filter design, real time
> signal
> processing on hardware (in this semester my "Labor work" is about fixed
> point multi rate filters (for radars), last semester with one of my
> college
> we created a "Larsen effect" cancelling system on an Analog Devices
> Blackfin
> eval board, and it actually worked... :) )
> - Matlab programming knowledge (experience with (multi rate) filter
> design,
> simulations, also with fixed point simulations)
> - Linux user and programing experience (till the end of this semester I'll
> accomplish a course called "Linux programming", which will give me more
> insight of programming the system)
> - FPGA programming (experience: realization of a Discrete Cosine
> Transformator, simple "VGA card" and pong game :) )
> - Atmel AVR (assembly, C) and ARM7 (eCos, C) programming experience
> I'm open to study new fields, interested in multimedia.
> With this background what can you recommend me, before I create my
> application?
> Thanks your help!
> Sincerely,
> Laszlo Szilagyi

Dear Michael Sevakis!

The resampling project you mentioned interests me, my current "labor work"
in this semester is partly about resampling (a digital down converter design
and implementation on FPGA, using CIC-filters and CIC-compensating FIR

Would you give me a more specific definition of the project?


Laszlo Szilagyi
Received on 2008-03-30

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