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wireless headset

kranthi kumar1
Prodigy 90 points
Other Parts Discussed in Thread: CC2500

Hello,

Im working on msp430 rf2500 development kit.I would like to transmit audio files and to receive them through headphones by stereo jack(3.5mm).can i implement using ez430 seh kit?what are the files needed to accomplish my task?

  • 0
    Guru 46710 points

    kranthi kumar1 said:
    what are the files needed to accomplish my task?

    Source code files written by you?

  • 0 in reply to Ilmars
    Prodigy 90 points

    I havent written yet.i dnt know what library files should be included for microcontroller,cc2500 and usb interfacing.I got some of the basic rf link codes from kit manual but my windows couldnt detect the module.Is that module suitable for wireless headset?If it is pls mail me the related files.

  • 0 in reply to kranthi kumar1
    Guru 46710 points

    Why do you want to create wireless headset if shops and department stores are full of dirt-cheap bluetooth headsets? Seriously.

  • 0 in reply to Ilmars
    Prodigy 90 points

    Its a part of our project,we would like to use the development kit for transfer of audio files from p.c to receiver module and using DAC or CODEC to headset.Its like adding new application for SEH kit in addition to the temperature sensor monitoring.Is there a possibility? We are given  only SEh kits in our organisation in which temperature sensor monitoring is the basic one which every one has to do and in addition to that one different application as per the regulations given by our faculty.

  • 0 in reply to kranthi kumar1
    Guru 46710 points

    kranthi kumar1 said:
    transfer of audio files from p.c to receiver module

    There's mono 2000 Hz bandwidth (voice-compatible) audio files and there's for example stereo audio files having 20KHz bandwidth that's more or less OK for the music. Please specify audio file your application shall support before we continue.

  • 0 in reply to Ilmars
    Prodigy 90 points

    our module can support upto 2.4ghz bands.

  • 0 in reply to kranthi kumar1
    Guru 46710 points

    kranthi kumar1 said:
    our module can support upto 2.4ghz bands.

    I was asking about audio file bandwidth. Please do not confuse band with bandwidth.

    How many audio channels, audio sample bits and sample rate your headset shall support?

  • 0 in reply to Ilmars
    Prodigy 90 points

    Its a stereo headset and it can support audio files having 320kbps and 128kpbs bit rates.

    smart rf studio 7 is not supporting ez430 rf 2500 kit.what i have to do to program cc2500 module for transmitting audio files.

  • 0 in reply to kranthi kumar1
    Guru 46710 points

    kranthi kumar1 said:
    Its a stereo headset and it can support audio files having 320kbps and 128kpbs bit rates.

    You do not measure audio bandwidth in kbps but in Hz: http://en.wikipedia.org/wiki/Bandwidth_(signal_processing)

    In short: drop audio & headset idea. Instead add something like air pressure measurements.

  • 0 in reply to Ilmars
    Prodigy 90 points

    we cant shift to another project sir.Its just adding dac to our receiver target board i.e, through accesible pins available and then to headset through stereo jack.we just need to verify whether we can send audio files from transmitter to reciever target board directly from computer.

     

  • 0 in reply to kranthi kumar1
    Guru 46710 points

    kranthi kumar1 said:
    Its just adding dac to our receiver target board i.e, through accesible pins available and then to headset through stereo jack.

    If it is so simple - then why you ask? - Do it!

    You said 128kbit audio file. What's bit depth of samples and sample rate? If 128kbit is lossy-compressed file like mp3 then which part of your system will uncompress it to raw audio samples?

    Let's assume you want to send 16bit 44kHz stereo to audio DAC from msp430. Are you aware that msp430 does not have I2S capabilities? So you need to augment it's SPI peripheral using external logic like CPLD.

  • 0 in reply to Ilmars
    Guru 227245 points

    Ilmars said:
    You do not measure audio bandwidth in kbps but in Hz:

    While basically right, this headset might be able to directly decode MP3 files with a given bit rate (not bandwidth!). In this case, data must be provided digitally, of course, and no DAC is needed at all. The bandwidth depends on the decoder/DAC/speaker combo and is independent of the audio file bitrate.

    If it is just an analog headset taking amplitude modulated AC audio signals (usually just two speakers), then it supports of course any (or more precisely none) audio file. THe hardwar ethat generates the audio signal needs to support (or not) audio files with this or that bitrate (and better should no limit the support to the mentioned two, as most MP3 files are VBR with varying bitrate and also 192kbps average bitrate is very common.)

  • 0 in reply to Jens-Michael Gross
    Prodigy 90 points

    ya but if it is a 3.5mm stereo jack can the audio file  be sent directly while playing  just like  in case of mobiles?

    and i dont know whether USB interface can be used in this case.So is there any scope for us to transmit audio files through msp430 kit? 

  • 0 in reply to kranthi kumar1
    Guru 46710 points

    kranthi kumar1 said:
    So is there any scope for us to transmit audio files through msp430 kit? 

    Your audio transmission plans does not seem to match your current level of expertise, sorry. Such project is way too complex for you if you ask questions like this:

    kranthi kumar1 said:
    but if it is a 3.5mm stereo jack can the audio file  be sent directly while playing  just like  in case of mobiles?

  • 0 in reply to Ilmars
    Prodigy 90 points

    thanku so much sir for your patience,but with your guidance i wish to complete this project sir.is it  possible to develop the ez430 kit for wireless headsets?

  • 0 in reply to kranthi kumar1
    Guru 227245 points

    kranthi kumar1 said:
    i wish to complete this project sir.is it  possible to develop the ez430 kit for wireless headsets?

    Possible, yes. But I doubt that you could complete it, at your current level of expertise. At least base don what you wrote (and asked) here, I fear that 'guidance' results in 'doing most of the project for you'.

    But to start with it...

    First, make a detailed and complete list of any specifications. Supply and signal voltages, data types, data rates, allowed latencies, interfaces...
    Then check whether the MSP matches them directly or whether additional hardware is required or whether the MSP is not capable of doing the job (e.g. not enough ram to hold a required buffer for calculations, not enough space to hold required tables, nor enough processing power for required calculations).

    Currently, even the specifications of the headset are still fuzzy.

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