Speaker phones
Earlier, speaker phones were usually used in companies where a number of people would participate in a discussion over the phone. The speaker phones would be much more expensive compared to conventional land line phones. However, with advances in technology, the price of speaker phones has reduced significantly. Also, many mobile phones are available with the speaker phone feature enabled.
In a speaker phone, the microphone and loudspeaker are provided separately, so that more than one person can participate in the conversation. The loudspeaker will amplify the voice signals received , so that everyone in the room can hear it. The conversation may also be recorded for use at a latter date. Using the microphone, anything spoken in the room is picked up and transmitted over the phone.
When speaker phone are installed in companies, they are often calibrated to suit the acoustics of the room. This ensure that the conversation is clearly transmitted without any echoes or ringing sounds.