×

Discussion Board

Results 1 to 6 of 6
  1. #1
    Registered User
    Join Date
    Oct 2007
    Posts
    2

    Exclamation concerns regarding voice calls

    Good day! I am planning to create a lie detector application for a symbian phone using Carbide c++. I don't know much about this programming language, and I am hoping someone could help me with the following:

    1. Is there a way for me to record voice calls?
    2. Is there a way for me to compute the sampling rate of the recorded
    voice calls?

    Any help with these two matters would be greatly appreciated.

    Thank you very much.

  2. #2
    Regular Contributor
    Join Date
    Mar 2007
    Location
    "On a b'ful lil palnet called EARTH belongs wid Galaxy named MilkyWay in Universe"
    Posts
    402

    Post Re: concerns regarding voice calls

    Quote Originally Posted by constantijn View Post
    Good day! I am planning to create a lie detector application for a symbian phone using Carbide c++. I don't know much about this programming language, and I am hoping someone could help me with the following:

    1. Is there a way for me to record voice calls?
    2. Is there a way for me to compute the sampling rate of the recorded
    voice calls?

    Any help with these two matters would be greatly appreciated.

    Thank you very much.
    see CMdaAudioRecorderUtility in SDK documentation for recording... and for caller's voice reffer
    RMobilePhone RMobileLine RMobileCall RTelServer RLine RPhone RCall
    ===With Symbian===
    "Something Has Survived..!!!"

  3. #3
    Super Contributor
    Join Date
    Mar 2004
    Location
    Singapore
    Posts
    9,968

    Re: concerns regarding voice calls

    Quote Originally Posted by constantijn View Post
    Good day! I am planning to create a lie detector application for a symbian phone using Carbide c++. I don't know much about this programming language, and I am hoping someone could help me with the following:

    1. Is there a way for me to record voice calls?
    2. Is there a way for me to compute the sampling rate of the recorded
    voice calls?

    Any help with these two matters would be greatly appreciated.

    Thank you very much.
    If you are using s60 v3.x then it is suggested that you look in to the APS {Audio Proxy server} APIs.

  4. #4
    Regular Contributor
    Join Date
    Mar 2006
    Posts
    280

    Re: concerns regarding voice calls

    I think the sampling rate is standard for GSM 8000 /s. I also think it may be variable in VOIP connections, so you may need more than one set of filters, however 8000 /s will be the norm for some time (basically because peoples voices aren't changing that much)

  5. #5
    Registered User
    Join Date
    Oct 2007
    Posts
    2

    Re: concerns regarding voice calls

    Thank you very much. I have one more question. How do I determine the (1) number of samples and (2) segment length from the recorded voice calls?

  6. #6
    Regular Contributor
    Join Date
    Mar 2006
    Posts
    280

    Re: concerns regarding voice calls

    The number of samples is the time in seconds of the recorded data * 8000. Not sure what you mean by the segment length. I expect you will have to supply a buffer of a know size and process it when it is full.

    If you are trying to pick up stress levels in the voice then you will have to compare the instantaneous frequency profile with a long term average. Exactly what instantaneous and long term mean is up to you and your app. Long term could be one call or over a number of calls if you store which user made the call. (but I suppose then you are assuming that the same user is always using the same phone)

Similar Threads

  1. E60 - Voice dialing requirements (several)
    By kja2615 in forum Series 40 & S60 Platform Feedback Archive
    Replies: 3
    Last Post: 2008-11-16, 18:48
  2. Pbs on using Real Player during voice calls
    By pavarang in forum General Development Questions
    Replies: 0
    Last Post: 2005-11-22, 14:29
  3. Recording Voice Calls
    By zanwar in forum Audio
    Replies: 0
    Last Post: 2005-04-21, 08:12
  4. Detecting incoming voice calls (Card Phone 2.0 + AT commands)
    By RISC_sleitner in forum Multimodecards
    Replies: 1
    Last Post: 2003-03-18, 07:06
  5. Nokia 22: CLI over RS232 for voice calls
    By motor205 in forum Nokia M2M
    Replies: 1
    Last Post: 2002-10-09, 04:15

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •