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Home karaoke recorder

Discussion in 'General Electronics Discussion' started by P.G., Feb 13, 2013.

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  1. P.G.

    P.G.

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    Feb 12, 2013
    Have plans to construct a karaoke recorder for home-front usage. Seeking datasheets, schematics, and manuals that may help with this project.

    What a karaoke recorder is. Most karaoke systems, whether home-front or professional, are strictly karaoke players. They allow playing of pre-recorded music, which the user can adjust and perform along with, but they do not allow recording of performances without the additions of separate equipment. By comparison, karaoke recorders DO allow such recording because whatever equipment has to be added onto karaoke players separately for recording purposes, is already, in a karaoke recorder, built into the system.

    Compatibility. This device is meant to be compatible with MIDI, CD, CD+G, MP3, MP3+G, DVD, and USB inputs, and to record by these and other similar outputs. It will not have a monitor of its own, though it will accept any external monitor in any definition standard. It will, potentially, be able to burn CDs, DVDs, and/or "Blu-Ray" disks, depending upon the capabilities of the installed hardware. Alternatively, it will be able to interface with a computer, most likely by USB, which computer will then be able to drain off the finished recording and/or convert it to appropriate format.

    Power sources. This is meant to accept up to and including eight (8) size D power cells, two (2) six(6)-volt lantern cells, and/or adaptations to AC power with an external three(3)-prong grounded power cable.

    Microphone inputs. There will be two(2), both of the one-quarter inch (1/4") connector type. Both will be monophonic in their inputs. However, the recorder will be able to double-channel each input to make stereophonic recording possible.

    Controls. Each microphone input will have its own volume control, on-off variable echo controls, stereophonic double-channeling control, and auto-voice control; these will run through a selector switch which allows one or both microphones to be used. The pre-recorded music, regardless of its source, will use an independent control to govern its pitch, its speed, or its tempo. All will run through a master volume control. The main power source will have its own separate on-off switch, along with a selector switch for which source is used.

    Any assistance will be greatly appreciated, and advance thanx is hereby given for all such assistance.
     
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Nov 28, 2011
    Sounds like a nice wish list.

    If you drop the requirement for it to run from eight D-cells or two lantern batteries, there's a solution available. It's called a PC (a laptop, even) with an external audio interface and lots of software installed on it.
     
  3. P.G.

    P.G.

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    Feb 12, 2013
    Response

    Fully aware that personal computers, whether running Windows or running MacOS, can do all that. But this planned karaoke recorder is meant to be a specialized, stand-alone karaoke machine capable of operating independently of any computer. Hence, it will have to be specially built.

    That motivates the request for assistance.
     
  4. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Nov 28, 2011
    It's totally impractical unless you use a PC but hide the fact that that's what it is.
    Do you have any idea how many man-hours have gone into the programming of even just a small part of the system such as an MP3 decoder? Or a file system handler for a USB Flash drive or memory card? Then you can increase that several orders of magnitude when you get into real-time audio signal processing.

    The amount of software needed to do what you want is ENORMOUS! The only reason it's feasible on PCs is because of the huge market. It is absolutely crazy to imagine starting from scratch!
     
  5. CocaCola

    CocaCola

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    Apr 7, 2012
    In addition to what Kris has said there are also legal issues in a commercial device that has a dedicated purpose designed to specifically infringe on the IP rights of others aka to re-record and distribute copyrighted works... It's a slippery slope to travel if you want to market it, fair use only goes so far...
     
  6. P.G.

    P.G.

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    Feb 12, 2013
    Alternatives?

    What if a karaoke machine, specifically one of the players now on markets, breaks down for some reason?

    To the best of personal knowledge, repair shops for those systems are so few and so far between that actually contacting one for the purpose shows no signs of being practical. Those on fixed financial incomes, for example, cannot simply transport their broken-down systems to local electronics stores and commission such repairs. Nor can they always afford new systems, much less ones of similar quality and/or features.

    Personal curiosity about what alternatives, if any, these people may have was what actually motivated the original start of the thread.
     
  7. CocaCola

    CocaCola

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    Apr 7, 2012
    What does repairing an existing karaoke machine have to do with designing a completely new on that records?
     
  8. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Nov 28, 2011
    Perhaps he's suggesting that his machine would be a suitable replacement for an existing karaoke machine that fails?
    Anyone with a dead karaoke machine would be best advised to buy a dedicated laptop, some external sound hardware, and a lot of software, as I suggested the OP should do. It's the most cost-effective option.
     
  9. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    Yeah, there are some full featured free karaoke software packages out there now, all you need is the computer and and you are off an running... As you suggest the only way for a stand alone system to be a viable alternative in today's world is to drop the cost to nil to compete against the 101 other options...

    BTW the other options start at well under $100, you can barely make a small run of LED flashing lights for that cost, let along a full featured audio system...

    http://www.walmart.com/cp/Karaoke-Equipment/106984
     
  10. P.G.

    P.G.

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    0
    Feb 12, 2013
    This particular karaoke machine has indeed apparently become inoperative. But it had to use tape cassettes, which now are no longer practical, to record. It could not record digitally.
     
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