DTMF Tones stands for Dual tone and multi-frequency music tones. This feature helps you to produce such sounds while using Audacity. For example, you will experience these sounds while pressing the keyboard keys of a telephone, etc. This option is available in the Generate tab. When you will select it, you will see some input boxes and some buttons.
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For more details, let us discuss briefly each one of them.
DTMF Sequence
This is the first input box, which will appear in the ‘DTMF Tones’ message box. You need to input numbers from 0 to 9, alphabets in the lower case from a to z and some special characters # and * only. This is for every single tone you are going to generate. Another special set of allowed inputs is A, B, C or D. The US Military uses this.
Tone Amplitude
Whenever you are working with the generation or editing the tones, you will often need to set its loudness which is defined by the amplitude of the sound. This option lets you do the same. You can input values from 0 to 1. 1 is the highest value of the amplitude. 0 represents complete silence. The default setting value is 0.8.
Duration
This input box lets you input the values either by typing from the keyboard or by setting the values using the arrows. Enter the required digit, if the input holder is not highlighted, then click on left or right arrows to enable the input. You can input digits by clicking on the up and down buttons to increase or decrease the value.
If you are using this feature for the first time, then the default duration will appear as 30 seconds. However, if this is the second or third time, basically not the first time, then it will remember the previous input value and set that as default.
Ratio-silence to tone
Adjacent to this is a slider. This lets you set the ratio between the lengths of the tone to that of silence. This is written in the digit form right under this slider in percentage form. If now you change the duration, then it will not change the ratio. The length of tone and silence will adjust simultaneously. Click here to learn more.
Command buttons and usage
At the bottom of the message box in Audacity, you will see five buttons. Let us understand each briefly.
- Manage: This lets you know more about the tool and set the tool presets in Audacity.
- Preview: This lets you preview the audio tone without actually applying the edits. You can always view the original audio along with the selected edits. You can view the audio until 6 seconds by default. One can change this any time from the Edit menu and preferences sub-menu and select Playback.
- OK: This will finally apply the selected edits.
- Cancel: This will delete the selected edits and will return you to the original audio tone.
- Question Mark: This button will take you to the manual (Help) page.
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