Speakerphone

speaker
A speakerphone is a telephone with a microphone and loudspeaker provided separately from those in the handset.wikipedia
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Telephone

phonetelephonesLocal Telephone Service
A speakerphone is a telephone with a microphone and loudspeaker provided separately from those in the handset.
In most landline telephones, the transmitter and receiver (microphone and speaker) are located in the handset, although in a speakerphone these components may be located in the base or in a separate enclosure.

Loudspeaker

speakerloudspeakersspeakers
A speakerphone is a telephone with a microphone and loudspeaker provided separately from those in the handset.
Speakerphone

Echo suppression and cancellation

echo cancellationecho cancellerecho suppressor
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.
A standard telephone or cellphone in speakerphone or hands-free mode

Microphone

microphonescondenser microphonedynamic microphone
A speakerphone is a telephone with a microphone and loudspeaker provided separately from those in the handset.

Handset

telephone handsethandset receiverphone receivers
A speakerphone is a telephone with a microphone and loudspeaker provided separately from those in the handset.

Duplex (telecommunications)

half-duplexfull-duplexduplex
Speakerphones may be broadly divided into two classes of Duplex:

Digital signal processing

DSPsignal processingdigital signal processing (DSP)
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.

Algorithm

algorithmscomputer algorithmalgorithm design
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.

Calibration

calibratedcalibratecalibrating
Many modern speakerphones must first be calibrated to the acoustic characteristics of the room in which they will be used.

Acoustics

acousticacousticianacoustical
Many modern speakerphones must first be calibrated to the acoustic characteristics of the room in which they will be used.

Audio feedback

feedbackguitar feedbackacoustic feedback
A failure to be properly calibrated can be indicated by the occurrence of echoing, ringing sounds, or feedback.

Cordless telephone

cordless phonecordless phonescordless
Many cordless telephones have a handset speakerphone as well as a base speakerphone.

Motorola Krave

The earpiece speaker and speakerphone microphone is mounted in the middle of the cover, with no apparent connection to the phone.

Samsung SGH-t319

Features for the phone include T-Zones, wireless internet, speakerphone and a camera.

Charlie's Angels

Charlie's Angeltelevision series of the same name*
Charlie gives the Angels and his associate John Bosley their assignments via a Western Electric speakerphone; he never meets them face-to-face, which leads to recurring queries from the 'Angels' as to when or if he will ever join them on assignment.

Nokia 9300

93009300i
The phone also has speakerphone functionality, which is activated automatically when the phone is flipped open.

Sidetone

Sidetone is disabled when phones of any kind are running in speakerphone mode, due to perpetual and almost immediate feedback.

Nokia 222

Nokia 222 has a 2.0 MP camera, speakerphone, multimedia playback, MMS messaging, Opera Mini web browser and e-mail client.

Nokia 1680 classic

It has a VGA camera, speakerphone, multimedia playback, MMS messaging, web browser and e-mail client.

Nokia 215

The Nokia 215 has a VGA camera, speakerphone, multimedia playback, MMS messaging, web browser and e-mail client.

Motorola V3688

V3688
However, it lacks a camera, speakerphone, or outer display.

Samsung B7330 Omnia Pro

Omnia Pro (B7330)Samsung Omnia Pro B7330
Speakerphone

Valhalla train crash

February 3, 20152015 train wreck in New Yorkcollision
It could not be determined if she had the phone on speaker, which would have allowed her to keep both hands on the wheel, but according to her husband, the ML350 was equipped with software that automatically detected the phone if it was in the vehicle and put it on speaker.

Nokia 5233

5233Nokia 5228/5233
Integrated hands-free speakerphone

Beats Pill

Dr. Dre portable speaker beats
The device also includes a microphone so it can be used as a speakerphone.