![]() Many cordless telephones have a handset speakerphone as well as a base speakerphone. ![]() A failure to be properly calibrated can be indicated by the occurrence of echoing, ringing sounds, or feedback. This calibration may be automatic or manually invoked by the user, and it may need to be repeated if the speakerphone is relocated within the room. During this calibration phase, they may make a variety of noises including ascending tones or chiming sounds. Many modern speakerphones must first be calibrated to the acoustic characteristics of the room in which they will be used. Their cost is also higher than for a half-duplex speakerphone. These phones are much more complicated and often employ sophisticated digital signal processing algorithms to sort out the incoming sound and the sound in the room for echo cancellation. There is a very definite, noticeable switching action each time the phone "changes directions" and a cough or other transient noise in the room may interrupt incoming sound from the far end of the telephone connection.įull-duplex speakerphones are able to transmit and receive simultaneously and there is no discernible change of transmission direction. While the user of the speakerphone is quiet, the speakerphone only receives sound from the telephone line and its internal speaker broadcasts that sound to its user. While the users of the speakerphone are speaking, the phone only transmits sound to the telephone line its internal speaker is cut off and no sound arriving from the telephone line can be heard by the user. ![]() Half-duplex speakerphones only allow sound to travel in one direction at a time, either: 1) into the speakerphone from the telephone line and out of its internal speaker to its user, or 2) from its user, into the microphone, and out through the telephone line. Speakerphones may be broadly divided into two classes of Duplex: The most sophisticated units allow the connection of additional satellite microphones that can be placed some distance from the main unit. Devices designed specifically for speakerphone use often have multiple microphone inputs arranged radially around the device to maximize sound input, such as may occur around a conference table. This button transfers the sound input and output from the handset to the ambient microphone and loudspeaker. Many telephones have an integrated speakerphone function which can be activated by pushing a single button. The term speakerphone is also sometimes used for loudspeaker, as in "put it on speakerphone". The loudspeaker broadcasts the voice or voices of those on the other end of the telephone line, while the microphone captures all voices of those using the speakerphone. This device allows multiple persons to participate in a conversation. JSTOR ( November 2013) ( Learn how and when to remove this template message)Ī speakerphone is a telephone with a microphone and loudspeaker provided separately from those in the handset.Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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