Dual-tone multi-frequency (DTMF) signal is used for telephone signaling over the line in the voice-frequency band to the call switching center. To generate such signal you need to open an audio file or create a new one, select the part of the file where you want to have DTMF signaling and click the DTMF Signals button on the Generate Tab. The following window will be opened:
You can set the following signal properties:
Select the type of the base DTMF signals used to create the sound:
You can also select to use the classic DTMF signals matrix or determine one of your own. The DTMF keypad has a 4x4 matrix, with each row representing a low frequency, and each column representing a high frequency. Pressing a single key (such as '1' ) will send a sinusoidal tone of the two frequencies (697 and 1209 Hertz). The original keypads had levers inside, so each button activated two contacts. The multiple tones are the reason for calling the system multifrequency. In case you customize the DTMF signals matrix and want to return to initial values, press the Reset to DTMF button.
Click Preview to make sure that the result is alright, OK to apply the settings and close the effect window, or the Cancel button to discard the changes.
Please note that AVS4YOU programs do not allow you to copy protected material. You may use this software in copying material in which you own the copyright or have obtained permission to copy from the copyright owner.
AVS4YOU is a registered trademark of Online Media Technologies, Ltd., UK. Intel and Core 2 Duo are registered trademarks of Intel Corporation. AMD and Athlon X2 are registered trademarks of Advanced Micro Devices, Inc. Windows 10/8.1/8/7/XP/2003/Vista are registered trademarks of Microsoft Corporation. All other trademarks are the property of their respective owners.