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    0 sounds
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    this is a menu music in the hunting unlimited 2008.i realy like the sound of the snare very much.i search through the site for snares but couldnt find the one i want, may be you know this snare or the drum kit that contains it,i am getting upsessive about this sample.i downloaded lots of snare packs from various sites,still no result.now i try my chance here and u caan say u got too far by thinking like this but i pray sometimes to have this sample.so thanks for ur concern from now and sorry about the english i hope u can get a clear sound from the mp3 recording of mine.goodday and good luck to everybody.

    LISTEN TO THE SNARE PLEASE

    rapidshare.com/files/131929341/Recorded_Audio_2008-Tem-23_05-39-15.mp3.html

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    98 sounds
    44 posts

    tweeterdj
    who thinks timtube needs a new way of reaffirming his life's worth?

    What do you mean by that?
    I just do sound effects because I have a ton of free time

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    im hunting for samples of a fairly typical sounding arabic string instrument
    a rebab? im sure there are hundreds of other names with this kind of instrument
    thank you all!
    peace

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    3121 sounds
    481 posts

    Bram
    Although it is not infallible AT ALL (adding one sample at amp zero will make it fail), we calculate md5 sums of all audio files on freesound. This is to prevent people from uploading exactly the same file twice. You have probably seen this happen to you.

    But there are other ways to detect verbatim (or very similar) copies. This is called fingerprinting rather than watermarking and is a much more robust system. Basically it works like the "search similar" on freesound. Say we would have access to the audiosparx database, we could calculate the most similar sound on freesound for all the sounds on audiosparx. If the distance between that sound, and a sound in freesound is VERY small, then it's probably a copy. This even works when the sound is compressed in some way.

    I will ask audiosparx to give us access to their database and see if we can use this process to eradicate all freesound source material from their site.

    - Bram

    Thank you for the input, Bram, that would be great.

    Now, psychology is very important, you know... so the simple knowledge that Freesound samples are (or can be) fingerprinted would have a double positive effect: that of deterring lazy thieves, and that of comforting honest users (which otherwise can be discouraged to contribute).
    Certainly, it would do no harm reminding users/visitors at the main freesound page that samples are/can be marked
    wink

  • avatar
    121 sounds
    1552 posts

    Although it is not infallible AT ALL (adding one sample at amp zero will make it fail), we calculate md5 sums of all audio files on freesound. This is to prevent people from uploading exactly the same file twice. You have probably seen this happen to you.

    But there are other ways to detect verbatim (or very similar) copies. This is called fingerprinting rather than watermarking and is a much more robust system. Basically it works like the "search similar" on freesound. Say we would have access to the audiosparx database, we could calculate the most similar sound on freesound for all the sounds on audiosparx. If the distance between that sound, and a sound in freesound is VERY small, then it's probably a copy. This even works when the sound is compressed in some way.

    I will ask audiosparx to give us access to their database and see if we can use this process to eradicate all freesound source material from their site.

    - Bram

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    jcrpg ( http://jcrpg.blogspot.com http://javacrpg.sf.net ) is a fully opensource game project. It's a 3d game with 3d monsters too. Classical RPG genre. GPL licensed source code, GPL or CC media.

    I couldn't find yet good sounds for the newly added kobolds. Anyone wanting to dub them? grin

    Cheers,
    Lead dev of jcrpg

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    3121 sounds
    481 posts

    soundhead
    Most thieves are likely to be too lazy to remove watermarks...
    Not that I'm advocating watermarking every sound.

    I agree, too lazy. Watermarking probably is overkill, but some form of label would be nice. Like the stamps used to mark books in many libraries - I think they call this an 'ex libris' ?

    Something that can be added automatically at uploading, some form of hash, a unique combination of size-date-time appended at the start/end, or... I don't know
    Thank you for the feedback

    D

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    0 sounds
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    I need a sample of an old bench/swing creaking. Like with the metal chains being strained. Also, the pitches of the creaking have to go from low to high and then high to low, if that makes sense. The sample is being used as percussion in a song I'm making.

    The closest I could find was this: http://www.freesound.org/samplesViewSingle.php?id=33256

    The pitches in the creaks are what I'm looking for but the background/wind noise I do not want. I sent a message to the uploader if he could clean it up so it was just the creaking but he hasn't gotten back to me.

    So if anyone could get me a similar sample or clean up the above one that would be helpful. Thank you. happy

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    15 sounds
    135 posts

    Most thieves are likely to be too lazy to remove watermarks...
    Not that I'm advocating watermarking every sound.

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    Check out her beautiful voice in the player at www.myspace.com/LBArecords

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    26 sounds
    107 posts

    who thinks timtube needs a new way of reaffirming his life's worth?

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    29 sounds
    37 posts

    That technique, like virtually all audio watermark techniques, uses a common secret keystream for both watermarking and watermark recovery. That is, in such schemes, you can't tell someone how to see if the watermark is present without also telling them everything they need to know to remove it. That's fine for some purposes, but probably not for the purposes under discussion here.

    Also, these watermarking schemes exploit perceptual coding techniques (as MP3 does) to be inaudible only under normal listening conditions. They are not guaranteed (and are unlikely) to remain inaudible under the kind of heavy post-processing that samples here are intended for.

    Unfortunately, it's just a hard problem.

    -matt

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    609 sounds
    276 posts

    Note, the link is still down!

    http://www.freesound.org/forum/viewtopic.php?t=1256

    digifish

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    37 sounds
    44 posts

    mab wrote:

    Digital watermarking (of audio, pictures, video, etc) has been an active research area in computing security and cryptology for the last decade or so. Unfortunately, unless I'm mistaken (and I could well be; I've not been doing research in the area for a couple years), the current state of the art has not yet produced a robust audio watermarking scheme that's both inaudible and infeasible for an attacker to remove. It's a very hard problem.

    I read the articles in the forum discussion of digital watermarking, and followed many of the links. Bram had posted a google search there. I followed it and came to this link that seems to be a robust scheme. I am *not* an expert in this area so I might have missed the obvious but it seemed to cover the bases very well. The neatest thing was that the watermark varied in amplitude with the audio and the amplitude of the watermark was calculated so that the tone was masked by the audio. They have an ingenious method for preventing people from stealing a watermarked work and calling it their own as well. All in all, it looked very good. They tested it pretty hard and the results were impressive..

    research.microsoft.com/users/binzhu/Papers/audio2.pdf

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    29 sounds
    37 posts

    wisslgisse
    I wonder how hard it would be for the freesound site to add such a digital watermark that said freesound, or any other symbol, over and over again in the 20 KHz to 40 KHz range, or the 0 to 20 Hz range to every sample uploaded.. Small effect on the sound but any spectrograph shows it clearly. Done right, it would probably be difficult to remove too.

    I vaguely recall those posts. I'll have to go back and read them.

    Digital watermarking (of audio, pictures, video, etc) has been an active research area in computing security and cryptology for the last decade or so. Unfortunately, unless I'm mistaken (and I could well be; I've not been doing research in the area for a couple years), the current state of the art has not yet produced a robust audio watermarking scheme that's both inaudible and infeasible for an attacker to remove. It's a very hard problem. My sense is that the advantage will tend to go to the attacker here. Google "information hiding workshop" to get a sense of current work in this area.

    And I strongly agree that the most effective and practical countermeasure to the kind of "piracy" being discussed here is indirect rather than technological or legal. Flood the 'net with high quality, freely usable content (that's why I'm here, for one...)

    -matt

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    2 sounds
    62 posts

    Anyway, I for one will take this lesson home: let's all keep flooding the internet with free content of good quality, that's our best move. At present, each time I watch some amateur video from Youtube being reproduced on TV, I smile to myself. In a few years time, who knows?

    Thank you so much for saying that, Dobroide! And watermarking is sensible, too.

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    18 sounds
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    hi

    Hi and welcome smile I gave you some tips on your other post. Here's another tip though: keep recording sounds wherever you can, and share them here if you want, you'll learn each time you hit that Record-button. I know I still do smile

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    18 sounds
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    DJ Chronos
    In another series about space (it might have been The Universe again but it can't remember) they say that a small part of radio hiss or white noise is actually "sound" from the Big Bang. Supposedly the "sound" is actually radio interference caused by remnant electromagnetic energy still floating around out there from when the universe was formed.

    I saw that too, however the amount of noise from the Big Bang is only a few percent, hardly noticable. Still cool to think that same energy still reverberates after so many million and million years.

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    18 sounds
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    With most audio software, you should be able to take any sound and convert it to 8 bit, mono, 44.1 or 22.05 kHz.

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    18 sounds
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    They're all a bit too loud. When recording, try to maintain headroom. Try keeping the input below -12 or -9 dBfs and certainly try to keep it always under -3 dBfs. Also when modifying and mixing your recordings, make sure you never or very very rarely hit 0 dBfs.
    Digitally, you can't go higher than 0, if you're trying to do so anyway, your sounds will clip there, which results in distorted sounds.