Forums

  • avatar
    92 sounds
    37 posts

    An interesting variation on the standard, electromagnetic AMT is one built using piezopolymer plastic film. Taket of Japan utilizes this technology in all of their products. http://www.taket.jp/

    The efficiency is relatively low, but the frequency response is purported to be greater than 150kHz. Their BATPRO 2 would likely be the most appropriate starting point.

  • avatar
    3 sounds
    18 posts

    Are you or do you know a younger woman with a French accent? Please consider contributing to my project!

    I am offering a free gift (ebook) related to the podcast for the person who can assist.

    Many thanks!

  • avatar
    0 sounds
    6 posts

    strangely_gnarled wrote:
    it's nice to get feedback when one tries to help.

    Yep, for sure. My fault for not replying right away. I went down a google rabbit hole with those terms and then just plain forgot to get back.

    strangely_gnarled wrote:
    an amplifier that only needs to deliver 1-2W (providing it is not driven too far into clipping). With a typical 8 Ohm speaker that would suggest a battery or power supply of 6v minimum.

    6v minimum. Hmm.

    I know the pi has a 5v output integrated into the board, I wonder if I could get away with that. I may order a cheap speaker/amp and try it out.

    Thanks again for the suggestions!

  • avatar
    0 sounds
    4 posts

    Hi Guys, My name is Brokezart and I'm a upcoming Producer.

    Can someone Record me a Producer TAG i prefer a Female or Child voice but a male voice is OK!
    This is what i wanted to record: Brokezart On The Beat. Young Brokezart. Brokezart. Brokezart Tracks. Brokezart your so wavy.

    Thanks a lot!

  • avatar
    0 sounds
    5 posts

    A sample of his voice rapping. I'm not sure where the confusion is?

  • avatar
    56 sounds
    121 posts

    Colab? music creators colab with other music creators and or singers. a sample is just a sample.

  • avatar
    13 sounds
    394 posts

    My full apologies buchannon, and thanks for responding. it's nice to get feedback when one tries to help. I hope my posts in other threads explain why I jumped to conclusions, even if in this case I was clearly wrong.

    To add a bit more info that might be helpful -

    Speakers are designed for typical audio, which has a high dynamic range. That is, in order not to compress and distort the peaks a tweeter might need to handle, say, 100W peaks when the mean(average) power level is only 2 or 3 Watts. Your application doesn't need to drive those peaks, but it still requires the tweeter to handle the heat generated by the average signal level, so you are probably looking at an AMT that is rated between 20-100W, but an amplifier that only needs to deliver 1-2W (providing it is not driven too far into clipping). With a typical 8 Ohm speaker that would suggest a battery or power supply of 6v minimum. Up to 12v (or +/- 6v) would make the thing go four times louder. With a continuous sine wave a 12v peak signal would give about 9watts into 8ohms which is close to or over the limit for a 100watt tweeter, but with a pulsed signal say 200millisec on, 2seconds off this would come down to under 1watt which should be safe for the speaker but still very loud. You would have to look at the sensitivity tech spec of the tweeter to work out just how loud.

    Again, my figures are "back of the envelope" but I hope they are a good pointer.

    Good luck with your project, and I hope you keep us informed on progress.

    Regards Wibby.

  • avatar
    0 sounds
    5 posts

    Hello,

    It would be very helpful to be able to search within multiple categories simultaneously (i.e. files with wav and aiff filetypes; or files with 44100, 48000 and 96000 sample rates). It gets a bit tiring trawling through sounds to keep coming across mp3s, flacs and 8/20k files.

    Would this be easy to implement? Would other users find this helpful?

  • avatar
    0 sounds
    6 posts

    dheming wrote:
    How much acoustic power you need? Short distance or far throw? The AMT tweeter used in ADAM studio monitors is quoted as operating up to 50kHz. The Pi connected to an audio "chip" amplifier connected to a wide bandwidth tweeter would be a reasonable approach for a variable frequency ultrasonic setup. There are caveats of course, but it all depends on what you're trying to do.

    I'm trying to scare off animals with a 25khz-50khz SHORT distance throw. Maybe 10 foot max.

  • avatar
    0 sounds
    6 posts

    strangely_gnarled wrote:
    Okay, I was fooled. Buchanon is another spammer

    I am not a spammer, sorry for not responding sooner! I'm just trying to digest this stuff as I'm a complete audio noob.

    strangely_gnarled wrote:
    Firstly it requires a bigger amplifier than ceramic transducers and will not work driven directly from a GPIO output.

    I'm still trying to understand the relationship between power/voltage, sound volume, and frequency. Frequency controls pitch, where as putting voltage into the system controls volume?

    strangely_gnarled wrote:
    To reduce the chances of burning out the tweeter there are three things to watch.

    1. Do not drive with ultrasonic continuously but in short bursts. For example, a 200ms burst every 2 seconds reduces the heating by 90% but should still squeak the sh** out of squirrels.

    2. Guard against DC and all low frequency’s below, say, 10kHz with a high-pass filter. All this energy would be turned directly into heat.

    3. Never drive the Tweeter directly with square waves, either from the output of the pi or due to clipping in the amp. This could be achieved with a low-pass filter set @ ~50-60kHz. A square wave will produce about 1.4 times more heat than a sine wave of equal peak magnitude.

    #1 Makes a lot of sense.
    #2 I don't plan on using this at low frequencies like that, but I will read up on high-pass filters which I'm unfamiliar with.
    #3 Just read up on this as well, and it also makes sense about square waves driving more heat.

    Thank you all for the responses, I'm just trying to figure this all out myself as well. It sounds like I'll need a power source of some time and many more hours of reading.

  • avatar
    49 sounds
    79 posts

    Hi LeBelgeElectrod,

    We've been having similar ideas for quite a long time now, and we are in fact working on something very similar to what you propose which will allow people to provide annotations for sounds in Freesound. We'll announce it when ready, probably in the coming months.

    Thanks for the comment smile

  • avatar
    3 sounds
    116 posts

    Anyone, please?

  • avatar
    0 sounds
    2 posts

    Hey,

    Are there any females that are willing to do a female vocal tag saying, RickyMac Beatz. Whoever is interested I'd appreciate it greatly. Maybe In return, there is something I could do for you as a producer. I'll leave it up to the person doing it to get creative with it. As Long as the vocal tag contains RickyMac Beatz. Thank you very much in advance. You can easily get ahold of me at info@rickymacproductions.com.

    Best Regards,

    RickyMac Beatz

  • avatar
    50 sounds
    6 posts

    I got you, no problem. I'm not pretending to be a part of Freesound staff but I just wanted to point that I'm a part of the community sound creators and that I was just proud of it.

    Then, I don't want to bring any issues and I will NOT use the official logo on my Facebook account, YouTube videos or whatever.

    Many thanks for the answers smile

  • avatar
    7 sounds
    3 posts

    Hi everyone,

    I d'like to talk with you about something that could really improve the quality of freesound database and takes advantage of the big community of people that we have here. For me, there is a lack of tool for describes the sounds uploaded. I mean, It could be really great to have a system that allows listeners to describe the sounds by themself since it's only possible for the moment to leave a comments and rating.

    For example, a very intersting thing should to allows the people to define if the sound is : monotonic, polyphonic, not tonal, etc and even to give the note (or the frequency?) if it is monotonic, to give the key or the chord in case it polyphonic.. etc. To give a tempo if it is rythmic.

    In fact, there is a pretty intersting book about this (that surely a lot of people know here) "Le Traité des Objets musicaux" by Pierre Schaeffer but it goes too far a website and it is not user friendly.

    What do you think about that ?

  • avatar
    77 sounds
    48 posts

    a (bad) haiku

    Spam comes and goes
    I have learned of AMT
    Springy Diaphragm.

    Thanks Wibby et al, I learned new stuff!

  • avatar
    0 sounds
    5 posts

    I would approach the producers you think are his nearest competition and say "my voice was used on this massive dancehall tune, want to collab?" and get them to sign you recording, performing and songwriting rights before you record.

    Use this to your advantage.

  • avatar
    0 sounds
    1 post

    tath very good

  • avatar
    49 sounds
    79 posts

    Dear Freesounders,

    I'm posting this to draw your attention to the special sample request that Bram posted in the forums and which we (the Freesound dev team and moderators) don't want to go unnoticed.
    We'd like to ask for your participation, especially the participation of those of you who have been Freesound users for a long time, but also of the newer members of the community.

    For those of you who don't know Bram, he started Freesound with Xavier Serra back in 2005 at the MTG-UPF. He did most of Freesound development during the first years and is still a very active participant in the project. But perhaps even more importantly, he has been (and still is) supporting and building the Freesound community during all these years, and greatly contributed in making Freesound what it is today. However unfortunate the circumstances are, let me take this opportunity to thank you Bram for the incredible efforts and energy that you put in Freesound!

  • avatar
    13 sounds
    394 posts

    Dear Bram,

    My warmest heartfelt thoughts to you and your family.

    No recording from me, but I could not have matched the calm and peace captured by klankbeeld anyway.

    I hope that over time the experience of having had them in your life will leave positive memories; a gain that will outlast your feelings of loss.

    My best regards to you all,

    Wibby.