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  2. Ringdroid - Wikipedia

    en.wikipedia.org/wiki/Ringdroid

    Ringdroid 1.0 was released in October 2008, a month after the launch of Android 1.0. Development continued through 2010 with several developers from Google contributing to the project. [ 7 ] The last APK posted to the development site was in 2010.

  3. Ringtone - Wikipedia

    en.wikipedia.org/wiki/Ringtone

    A ringtone maker is an application that converts a user chosen song or other audio file for use as a ringtone of a mobile phone. The ringtone file is installed in the mobile phone either by direct cable connection, Bluetooth, text messaging, or e-mail. On many websites, users may create ringtones from digital music or audio.

  4. DTMF - Wikipedia

    en.wikipedia.org/wiki/DTMF

    Dual-tone multi-frequency signaling (DTMF) ... For example, the 1 key produces a superimposition of a 697 Hz low tone and a 1209 Hz high tone. Initial pushbutton ...

  5. Ringing tone - Wikipedia

    en.wikipedia.org/wiki/Ringing_tone

    In Japan, the standard audible ringing tone is a repeating one-second tone with a two-second pause between. The tone has a frequency of 400 ± 20 Hz, and the amplitude modulation is 15 to 20 Hz. [citation needed]

  6. Ringing (telephony) - Wikipedia

    en.wikipedia.org/wiki/Ringing_(telephony)

    Ringing is a telecommunication signal that causes a bell or other device to alert a telephone subscriber to an incoming telephone call.Historically, this entailed sending a high-voltage alternating current over the telephone line to a customer station which contained an electromagnetic bell.

  7. Isochronic tones - Wikipedia

    en.wikipedia.org/wiki/Isochronic_tones

    Isochronic tones can quantitatively be distinguished by both the frequency or pitch of the tone itself, and by the interval or frequency of repetition of the tone. While listening to isochronic tones is a technique often employed in the theoretical practice of brainwave entrainment, there is no significant research that confirms any claims of ...