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Thread: Car 5.1 Dsp Options Vs Pc 5.1 Dsp

  1. #1
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    Car 5.1 Dsp Options Vs Pc 5.1 Dsp

    There are only 2 useable mobile DSPís that are compatible with PCís the Audiobahn ADD51T & the Panasonic CY-AC300 EX or the older version the CY-AC300

    First I will tell you why you need a mobile DSP versus a PC based DSP like the Extigy

    Mobile DSPís are engineered for harsh noisy 12 volt environments there power supplies
    Are designed to block out the power surges and electrical noise from the alternator & ignition system

    The RCA outputs are a minimum of 3 volts peak to peak because of this they block out 98% of the radiated noise and prevent & reduce the severity of ground loop noise that wine you hear from the ignition system & alternator in an automobile
    PC based systems have a output of no more than 2 volts peak to peak & there power supplies have hardly any filtering they also use up computer resources & slow things down and often do not support Dolby Digital & DTS

    Here are some terms that are often used incorrectly

    Toslink is a connector used on some fiber optic cables but not all

    SP/DIF is 1 a transmission protocol like USB & IEEE1394
    2 it is also a transmission medium SP/DIF specís is a 50 ohm RCA cable also known as a digital audio cable

    AC3 is an audio CODEC transmission protocol

    Linear PCM also known as PCM is an Audio CODEC

    Dolby Digital Dolby prologic I/II & DTS 5.1 are all audio CODECíS

    Hereís how it works

    The computer gets the data form the DVD & sends it to a program like AC3 Filter witch extracts the codec you want say DTS then converts it to a AC3 stream and sends it to the sound card witch converts it to a SP/DIF data stream & sends it out the SP/DIF output or sends it out the fiber optic output as a SP/DIF data stream the SP/DIF signal sends the AC3 signal that is sending the DTS data to the processor where it is converted to separate analog signals kinda confusing I ainít it

    Hereís why other mobile DSPís wonít work

    The Audiobahn & Panasonic units are standalone units meaning they will work with any input that meets minimal requirements witch is a Toslink or Digital Audio cable sending a AC3 data stream they donít require other equipment to work properly they also have built in volume controls other units require a stereo RCA signal to control the volume and it is not easy to run 2 sound cards on 1 PC and have both being used by the same program at the same time

    The Pioneer DSP can be used if you use a pioneer head unit with it to control the volume

    What you need to do is to cut the pioneer fiber optic cable & polish the cut end & then put it in a Toslink connector so you can plug it into a PC or SP/DIF to Toslink converter if needed

    All other units Alpine Kenwood & so on canít easily be implemented with a PC because of the volume control problem

  2. #2
    Self proclaimed spoon feeder TruckinMP3's Avatar
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    Yeah! Real information on Mobile DSP! I wish my bank account had more zeros on the left of the decimal.
    TruckinMP3
    D201GLY2, DC-DC power, 3.5 inch SATA

    Yes, you should search... and Yes, It has been covered before!

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  3. #3
    Jesus Freak antimatter's Avatar
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    Nice Info. thanks
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  4. #4
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    Quote Originally Posted by TruckinMP3
    Yeah! Real information on Mobile DSP! I wish my bank account had more zeros on the left of the decimal.
    Yeah, but doesn't everyone wish that?

  5. #5
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    Thanks for the info port20

    Quote Originally Posted by port20
    All other units Alpine Kenwood & so on canít easily be implemented with a PC because of the volume control problem
    So if you are will to use a headunit from the same manafacture for volume control are any other dsps useable?

    ie do they have Toslink or other easy to convert connectors?
    Proper Planning Prevents Poor Performance

  6. #6
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    daiwilliamsuk here's your answer only with the pioneer

    other units require a stereo RCA signal to control the volume and the toslink or spdif it is not easy to run 2 sound cards on 1 PC and have both being used by the same program at the same time
    now if you can send analog and digital signals at the same time then you don't need a head unit
    it is very hard and sometimes not possable to use 2 sound cards with the same program but if you rewrite the app to do so it could work

  7. #7
    Neither darque nor pervert DarquePervert's Avatar
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    Quote Originally Posted by port20
    daiwilliamsuk here's your answer only with the pioneer

    other units require a stereo RCA signal to control the volume and the toslink or spdif it is not easy to run 2 sound cards on 1 PC and have both being used by the same program at the same time
    now if you can send analog and digital signals at the same time then you don't need a head unit
    it is very hard and sometimes not possable to use 2 sound cards with the same program but if you rewrite the app to do so it could work
    Thanks for the info. This was something I debated on how tyo implement.I was thinking about using the built-in Front L/R, Rear L/R and Sub outs going to a pair of amps (one 4-way for the Front & Rear and another to drive a mono subwoofer), and then call it a day.

    I've done looking for mobile DSPs and you're right: they are few and far between. The ones that do exist don't have TOSlink capability for optimal data transfer. And the two options you presented aren't cheap.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  8. #8
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    What about Alpine's PXA-H510 and PXA-H700?

  9. #9
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    thanks again port20.. You've saved me a lot of time and money!
    Proper Planning Prevents Poor Performance

  10. #10
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    Quote Originally Posted by port20
    other units require a stereo RCA signal to control the volume
    So would it be possible to use the stereo RCA output from a head unit playing any old cd to control volume? i.e. One audio stream from the computer (TOSLINK)to listen to and one from the head unit (RCA) for volume control.
    Proper Planning Prevents Poor Performance

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