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TDU in VOLIB2.0.0.3 unable to detect change in MFC

Pankaj Bamola1
Prodigy 45 points

Hi,

I would like to mention that i have successfully implemented TGE and TDU components of the VOLIB for generation of various tones as well as detection and generation of DTMF digits. However, I have starting facing issues when i tried detecting MFC tones using TDU.

Actually, the source exchange providing the MFC tones never shuts down a particular tone. it keeps on generating one tone after another continuously. MFC tone just changes from one to the other.

In the detection of dtmf, a particular dtmf frequency is available for certain time period and then goes off, after that another dtmf frequency is available. In this scenario, all dtmf frequencies are successfully detected using TDU.

However, it is not same in the case of MFC as stated earlier. When i use TDU, It always successfully detects the first MFC frequency but after that no subsequent frequency could be detected as the first frequency never goes off. It just changes into the second frequency.

Thus, from the above observation i assume that the TDU could not detect the change in frequencies. It would be able to detect a new frequency only if the earlier frequency goes off and the new frequency is generated after that.

Could anybody tell me whether my assumption is correct or not? Please guide me through this, How should i proceed to overcome this problem


FYI

i am using following components

VOLIB2.0.0.3

BIOS_6_34_02_18

Thanks

Pankaj

  • 0
    TI__Guru* 95265 points

    Pankaj,

    How the MFC looks like? Do you have a sample can attach? The detector needs to detect the frequency ON and OFF before detecting next frequency.

    Regards, Eric

  • 0 in reply to lding
    Prodigy 45 points

    Hi Eric,

    Thanks for your response. You have answered my question, this is what i assumed that the detector needs to detect the frequency on and off before detecting next frequency. In my case the frequency just changes from one to the other. One frequency never goes off before the start of next frequency.

    Guess i'll have to think of something else to make this work.

    Thanks & regards

    Pankaj Bamola