Re: Busy Tone Frequency & Pattern?

There are some tone detector IC's CML micri circuits.
http://www.cmlmicro.com/products/WTelecom/CMX683.htm

http://www.cmlmicro.com/products/WTelecom/CMX673.htm

http://www.cmlmicro.com/products/WTelecom/FX663.htm


"eeh" <eehobbyist@xxxxxxxxxxxx> wrote in message
news:1134376553.170279.252150@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hi,
>
> I have found in the web that following information about busy tone of
> my country:
>
> Tone: Busy
> Freq: 480 + 620
> Amp: -13
> Cadence: 0.5 seconds on, 0.5 seconds off,REPEATED
>
> What is the meaning of "Freq: 480 + 620"? Is it a dual tone frequency?
>
> If yes, could I calculate its existence by just a timer?
>
> I can get rectangular waves in the telephone line using call progress
> filter.
>


.

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