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Thread: HU Quality AM/FM RDS/RBDS Radio with Features

  1. #291
    Jesus Freak antimatter's Avatar
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    Quote Originally Posted by rando
    And with that, hot off the press, I'm listening to radio right now from this thing!

    Woo freak'n hoo!
    Get the production line and the sweatshops ready
    -Jesus- King of Kings Lord of Lords

  2. #292
    My Village Called 0l33l's Avatar
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    Just heard the radio today. Lets hope that you can enable the algorithms

  3. #293
    Raw Wave tj!2k4's Avatar
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    Umm.. is that a good or bad verdict, oleel?

    BTW - if you put a beret on that avatar, it could pass for a Libyan dictator.

  4. #294
    My Village Called 0l33l's Avatar
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    Quote Originally Posted by tj!2k4
    Umm.. is that a good or bad verdict, oleel?

    BTW - if you put a beret on that avatar, it could pass for a Libyan dictator.
    beret

    Umm.. it had static if you put your head to the speaker. Also it wouldn't pick up 105.9, a station that was picked up by a stock toyota navigation system. So yeh... Rando said he's working on it. Also said that enableing some algorithms might help. Also said he wasn't sure if he connected it to the right antenna.

  5. #295
    Stank Cheese n8scstm's Avatar
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    Nevertheless, it sounded 100 times better than my pci radio tuner card and I'd pay $100 for it in the current state. Who listens to 105.9 anyways. It's all about 106.7 As long as it gets that, we are ok.
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  6. #296
    Raw Wave rando's Avatar
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    Just a point of correction, it did tune 105.9 a bit later in the afternoon; though certainly not well. It tunes it just fine here in my area so the problem may very well have been related to the antenna system in my truck. The factory Toyota radio uses a diversity tuning system. This means it uses two polarized antennas and selected between them so rapidly that you can't hear the switch. Any time you use only a single antenna from this kind of system, you can expect reduced performance.

    It's also the case that the factory radio in my truck was always a poor performer in terms of tuning. So, again, I'm not 100% sure we can cast a verdict on the EM performance just yet.

    The noise/hiss that you describe is real. We're still hunting down the source of that. We hope to have more results soon about any improvements in what you all heard today.

    Hopefully a few more of you that heard the demo will comment so people can get a more complete idea of how it worked. In all, I believe the consensus was that it was a succesful demo for a non-optimized EM implementation.

  7. #297
    Constant Bitrate Heckle0's Avatar
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    Haven't heard such noise from this thread in a while. Sounds like you guys are right on track. Can't wait to see this thing being sold on the site.
    How close do you think you are to a completed product?
    Another Novice?
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  8. #298
    Raw Wave rando's Avatar
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    Quote Originally Posted by Heckle0
    How close do you think you are to a completed product?
    CRAM, at least, is still a ways off. Sorry, we can't be more specific than that. The FAQ will continue to be the most up to date source of information.

  9. #299
    My Village Called 0l33l's Avatar
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    Quote Originally Posted by n8scstm
    Nevertheless, it sounded 100 times better than my pci radio tuner card and I'd pay $100 for it in the current state. Who listens to 105.9 anyways. It's all about 106.7 As long as it gets that, we are ok.
    I thought that it sounded great at first too, then I put my ear to the speaker It didn't get 106.7 either if IIRC. It just skipped over any station over 100 IIRC. Maybe you guys got that fixed while I was demoing NaviVoice
    Quote Originally Posted by rando
    Just a point of correction, it did tune 105.9 a bit later in the afternoon; though certainly not well. It tunes it just fine here in my area so the problem may very well have been related to the antenna system in my truck. The factory Toyota radio uses a diversity tuning system. This means it uses two polarized antennas and selected between them so rapidly that you can't hear the switch. Any time you use only a single antenna from this kind of system, you can expect reduced performance.

    It's also the case that the factory radio in my truck was always a poor performer in terms of tuning. So, again, I'm not 100% sure we can cast a verdict on the EM performance just yet.

    The noise/hiss that you describe is real. I'm still hunting down the source of that. I hope to have more results soon about any improvements in what you all heard today.

    Hopefully a few more of you that heard the demo will comment so people can get a more complete idea of how it worked. In all, I believe the consensus was that it was a succesful demo for a non-optimized EM implementation.
    No worries. I know that we'll get that fixed. That's why I didn't want to post the results in the posts

    We shouldn't tested it in my car, but I need to know how to get the damn attenna up first

  10. #300
    Raw Wave rando's Avatar
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    Quote Originally Posted by 0l33l
    It just skipped over any station over 100 IIRC.
    huh? Definitely not true. I think you're confusing behavior of the demo application (definitely not a production ready app) with that of the actual radio performance. Remember, we just hacked that app together last night.

    The seek-scan algorithm (implemented in the code) just looks for stations in .2MHz increments starting at whatever you had entered into the tuning field text box. So if you started with an invalid U.S. tuning frequency (i.e. anything not ending in an odd increment) it would roll all the way around until it got to something greater than 107.9. Then it would jump back to a valid frequency starting at 87.9 and continue seeking; at which point it would find stations again. Sorry, I guess I should have explained that better to avoid this kind of confusion.

    The hardware and software you saw can and did tune (and correctly seek-stop) on frequencies all over the FM band. 105.9 didn't tune well even when manually entered. That problem is very likely related to the specific antenna performance in my truck. To a lessor extent, it's possible there are settings in the radio hardware that might have made it possible to lock into the station regardless. Also, the assembly technique (point to point wiring, multiple circuit boards, basic inattention to RF signal crossings, etc) may also limit the end performance of the EM.

    We believe the hiss is also related to signal quality because it's not consistent across every station. There are numerous settings in the signal processor that (we think) are designed to compensate for this. The CRAM Demo app is not using any of those settings yet. We'll let you know if we discover something about this.

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