View Poll Results: Will you buy RadioMax USB?

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  • Yes

    10 62.50%
  • No

    1 6.25%
  • It's too expansive

    5 31.25%
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Thread: RadioMAX - FM, AM, WB, RDS USB Car PC Radio + DAB/DAB+, HD Radio, GPS Loger

  1. #21
    ibf
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    Quote Originally Posted by tempgp View Post
    in reverse, i have I2S output on the chip but i don't have a recorder module just yet (of course i can do firmware and record WAV on SD card but that may be a lot of work )
    As to what to slect as main chip for a base board... DAB chip m using does not fave FM (but I can get one w/ FM though) but main reason for using AM/FM/WB chip as main is that AM is everywhere and DAB is only available in select countries. So since im in USA and main distribution base is here and in Russia (where dab is not used even though it is broadcasted) i think it makes more seance to use something that is used every where on base board rather then something that is used in certain locations.

    On another hand maybe it is reasonable to create base board without any radio on it at all and then buyers can select which add ons they need. This may work better but it will increase production cost and there might be problems with antenna performance as longer lead line is needed (although FM is not 2.4Ghz so RF leakage should not be a big deal
    Ok I understand what you meant about the WB/AM. I only suggested it because I have never switched an AM radio on (in UK) for a long long time. Not even sure whats on it these days.

    Plain baseboard is not a bad idea, Australian buyers might want their unit to come with a DAB module installed of FM/AM/WB...if you can pull it off why not.

    There are some I2S to USB converter around, not sure of the cost, probably expensive though. TAS1020B chips definately does I2S to USB. You can use 2 SPI's from your main MCU to rip the I2S stream and convert it to WAV, not hard to do but I guess it would be too much work just for a demo.

    Just a thought, can the MCU handle all the addons working all together at the same time? transfering datas to and from USB as well as processing it without much of a problem? Ill imagine it could be a very tricky task?

    Anyway good luck.
    Last edited by ibf; 11-18-2011 at 07:34 PM.

  2. #22
    Maximum Bitrate tempgp's Avatar
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    There are some I2S to USB converter around, not sure of the cost, probably expensive though. TAS1020B chips definately does I2S to USB. You can use 2 SPI's from your main MCU to rip the I2S stream and convert it to WAV, not hard to do but I guess it would be too much work just for a demo.
    ooo good idea! I have cypress usb that we used to develop high end audio player, i think it has I2S and we already have audio driver for it I will ask my guy to see if we can hook up 2 things in one

    as to AM well i tell you that i dont even know how to use radio in my car, both FM and AM but i know all cards still use AM so when i look at CarPC i think it should have much more advanced features then regular cars so AM should be parts of it

    To me AM and WB is just an emergency precautions, as ive seen NY after hurricane and when cell phones are not working, traffic lights are broken, trees are fallen you feel like it is a war zone and only way for me (2 years ago) to find out what happened was to listen to WB FM and AM was down too So after that I figured that before i through away my stock radio I need to get decent replacement candidate I was not able to find any decent existing solution so here we go ... doing this project ... probably will not brake even on financial side but at least will have nice toy
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  3. #23
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    Quote Originally Posted by tempgp View Post
    the audio level was set to max on the radio... how would you recommend to evaluate sound quality?
    Audio level from the radio module has to match connected equipment. Too high and distorsion is the result. Listening to the recording once more there are some few low level stations that don't distort (that much). Try to lower the output level and make a new recording.

    The Ultimate DAB Radio has outstanding sound quality and very good reception also in the FM band. But with no plug-in development for newer versions of CF the product is of no use. To have long term success in this business driver/plugin development has to be maintained for many years to come.

    DAB vs FM vs AM. Here in Norway FM is what is most common at the time being. In densely populated areas DAB is available. For the future DAB+ will be the only option as FM will be closed down in 2017. AM is almost dead already.

    FM frequency band used here in Norway is 87.5 - 108MHz in 0.1MHz steps. I guess US use 0.2MHz steps.

  4. #24
    Maximum Bitrate tempgp's Avatar
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    ok will do new test recording say at 25% volume on chip.
    As to plugin continuity, as some people know me im more or less responsive with CF plugins updates (well lagging with CF4.0 but old plugins still work there.. waiting for CF4.1 before i rebuild code) Also source code for plugins will be available so any one who wants to tweak it can do it and post their deviations of the software I will make CF plugin and Windows + Linux sample code. Linux in C++, Windows in C++, C# and maybe VB so any may people can jump in and say do plugin for RideRunner or Open Mobile
    Automotive LED Headlight Module High Power VS HID NEW
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  5. #25
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    Thanks! You may try different settings. You will hear when distortion disappears. I hope audio level will be user adjustable?
    Open Source will safeguard the product's longevity. I like this

  6. #26
    Maximum Bitrate tempgp's Avatar
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    making audio level adjustable on the software side is not a problem
    On FM chip i even can allow custom filters and SNR tweaks,
    Automotive LED Headlight Module High Power VS HID NEW
    Acura / Honda A/V CarPC Adapter GA-NET+ - Convert your native navi DVD unit to CarPC + Dash buttons are usable in car pc!!!
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  7. #27
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    Concerning DAB/DAB+ I looked at the Keastone Chips
    http://www.keystonesemi.com/products.php

    All of them has a FM receiver integrated. So If the soundquality of your Silabs Chip is not sufficent you can try to use the Keystone receiver.

    It seems you have good connections for getting these Chips.. Iam not able to get some Datas for "KSW8650VQ" module...for example.
    I was currios which impedance the antenna will have and if there a SPDIF Output available.
    Your Radio will not be the first which got bad reception caused by mismatch of radio and antenna impedance.

  8. #28
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    Looks interesting.

    Will GPS talk NMEA sentences?

    Also, HD Radio is of interest.
    How far along are you?

  9. #29
    Maximum Bitrate tempgp's Avatar
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    Quote Originally Posted by waltersaegir View Post
    Will GPS talk NMEA sentences?
    Also, HD Radio is of interest.
    How far along are you?
    - yes GPS will output NMEA, just like regular GPS Also port speed can be set to 4800 or 9600
    - we will look at HD radio later next year, bit expansion socket will allow plugin for that chip (i hope)
    - in terms of progress, i got all components yesterday, will give them to my developers on Monday so we can have FM/AM + GPS prototype in coming weeks, then DAB+ as a hardware will be available same time but software side for DAB may take a bit longer as we will be writing it blind
    Automotive LED Headlight Module High Power VS HID NEW
    Acura / Honda A/V CarPC Adapter GA-NET+ - Convert your native navi DVD unit to CarPC + Dash buttons are usable in car pc!!!
    Centrafuse Garmin Mobile PC Skin - GMPC Rebellium Skin

  10. #30
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    It should be possible to set up a computer in an area with DAB signals (here f.x.) and give you remote access.

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