![]() ![]() Also known as CTCSS/PL/Channel Guard etc. That's a reed for a two way radio subadible selective calling system. A 3.58-MHz (color burst) crystal-controlled time base guarantees accuracy and repeatability.Child, you must be very young. The use of integrated circuit techniques allows the M-991 to incorporate the control, Tone generating, and power output buffer into a single 14-pin DIP or a 16-pin SOIC. The M-991 is designed to permit operation with almost any system. The circuit uses low-power CMOS techniques to generate Tones which are digitally controlled and highly linear. The M-991 is a Call progress Tone generator integrated circuit for use in telephone systems. This is in contrast to other Call progress detection devices which are based on simple filtering techniques. The use of DSP techniques allows the CMX673 to distinguish between valid Call progress Tone signals and line noise or voice, low false detection rates result. The CMX673 uses advanced digital signal processing techniques to detect Tones in the frequency band 315Hz to 650Hz. ![]() Ringing, Busy, Not available and Answer states can be determined. ![]() Call progress detection allows equipment which dials into the PSTN network to monitor the progress of the resulting Call. The CMX673is a general purpose Call progress Tone detector for use in Public Switched Telephone System (PSTN) applications.
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