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  2. Ringing tone - Wikipedia

    en.wikipedia.org/wiki/Ringing_tone

    Bell System tones. In North America (excluding Mexico, Central America and parts of the Caribbean ), the standard audible ringing tone is a repeated cadence of a two-second tone and four seconds of silence. In Korea, repeated cadence of a one-second tone and two seconds of silence. The signal is composed of the frequencies 440 Hz and 480 Hz.

  3. Ringing (telephony) - Wikipedia

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

    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.

  4. Ringtone - Wikipedia

    en.wikipedia.org/wiki/Ringtone

    Ringtone. Ringing noise from an electromechanical telephone. Example of a short digital tune which could be used as a ringtone on a mobile phone. A ringtone is the sound made by a telephone to indicate an incoming telephone call. Originally referring to the sound of electromechanical striking of bells or gongs, the term refers to any sound by ...

  5. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    Call-progress tone. In telephony, call progress tones are audible tones that provide an indication of the status of a telephone call to the user. The tones are generated by a central office or a private branch exchange (PBX) to the calling party . Telecommunication equipment such as fax machines and modems are designed to recognize certain ...

  6. Ringing (signal) - Wikipedia

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

    Electrical circuits. In electrical circuits, ringing is an oscillation of a voltage or current.Ringing can be undesirable because it causes extra current to flow, thereby wasting energy and causing extra heating of the components; it can cause unwanted electromagnetic radiation to be emitted [citation needed]; it can increase settling time for the desired final state; and it may cause unwanted ...

  7. Dial tone - Wikipedia

    en.wikipedia.org/wiki/Dial_tone

    Dial tone. A dial tone ( dialling tone in the UK) is a telephony signal sent by a telephone exchange or private branch exchange (PBX) to a terminating device, such as a telephone, when an off-hook condition is detected. It indicates that the exchange is working and is ready to initiate a telephone call. The tone stops when the first dialed ...

  8. Tinnitus - Wikipedia

    en.wikipedia.org/wiki/Tinnitus

    Tinnitus is a variety of sound that is heard when no corresponding external sound is present. [1] Nearly everyone experiences faint "normal tinnitus" in a completely quiet room; but it is of concern only if it is bothersome, interferes with normal hearing, or is associated with other problems. [6] The word tinnitus comes from the Latin tinnire ...

  9. Portal:Telephones/Selected audio - Wikipedia

    en.wikipedia.org/wiki/Portal:Telephones/Selected...

    Ringing tone (audible ringing, also ringback tone) is a signaling tone in telecommunication that is heard by the originator of a telephone call while the destination terminal is alerting the receiving party. The tone is typically a repeated cadence similar to a traditional power ringing signal (ringtone), but is

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