Typically it is depicted as a lunch-box sized object with some combination of microphone, speaker, keyboard and display.

Instead of a microphone and speaker, Le Guin's ansibles are attached to a keyboard and small display to perform text messaging.

This audio tone was then transmitted using an acoustic coupler ( a speaker, in this case ) attached to the microphone of a common telephone handset.

At the receiving end, a handset ’ s speaker was attached to an acoustic coupler ( a microphone ), and a demodulator converted the varying tone into a variable current that controlled the mechanical movement of a pen or pencil to reproduce the image on a blank sheet of paper on an identical drum rotating at the same rate.

" a handy multi-purpose compact machine which incorporates an amplifier speaker, one or two tape mechanisms, optional tuner or radio and microphone mixer with features to enhance one ’ s voice, such as the echo or reverb to stimulate an opera hall or a studio sound, with the whole system enclosed in one cabinet casing.

For large assemblies, the speaker will usually speak with the aid of a public address system or microphone and loudspeaker.

All modern telephones have a microphone to speak into, an earphone ( or ' speaker ') which reproduces the voice of the other person, a ringer which makes a sound to alert the owner when a call is coming in, and a keypad ( or on older phones a telephone dial ) to enter the telephone number of the telephone to be called.

The microphone converts the sound waves to electrical signals and then these are sent through the telephone network to the other phone and there converted by an earphone, or speaker, back into sound waves.

The strong outgoing voice signal from the microphone does not overpower the weaker incoming speaker signal with a sidetone because a hybrid coil ( A3 ) subtracts the microphone's signal from the signal sent to the local speaker.

The off-hook components include a transmitter ( microphone, A2 ), a receiver ( speaker, A1 ), and other circuits for dialing, filtering ( A3 ), and amplification.

A calling party wishing to speak to another party will pick up the telephone's handset, thereby operating a lever which closes the switchhook ( A4 ), which powers the telephone by connecting the transmitter ( microphone ), receiver ( speaker ), and related audio components to the line.

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.

Along with the microphone and speaker, additional circuitry is incorporated to prevent the incoming speaker signal and the outgoing microphone signal from interfering with each other.

This causes a small portion of the microphone output to be fed back to the speaker, while the rest of the AC current goes out through the phone line.

Some readers may have additional features such as LCD and function buttons for data collection purposes ( i. e. clock-in / clock-out events for attendance reports ), camera / speaker / microphone for intercom, and smart card read / write support.

This is different from the principle behind the speaker and dynamic microphone because the vibrations are sensed directly by the magnet, and a diaphragm is not employed.

The allocated time slot on the wiring into the concentrator is used to send data from the remote telephone's microphone to the local telephone's speaker.

The allocated time slot on the wiring out of the concentrator ( with the same time slot number ) carries data from the local microphone to the remote speaker.

* A softphone is application software installed on a networked computer that is equipped with a microphone and speaker, or headset.

An avid Star Trek fan, he named his son ( born 2003 ) not after the Star Trek: Deep Space Nine character Dax as is often reported, but after a childhood friend, and often refers to himself as a Klingon ( once claiming during his " Part Troll " tour that his ear-mounted microphone made him resemble " a wizard in a call centre " and " a Klingon motivational speaker ").

Transformers range in size from a thumbnail-sized coupling transformer hidden inside a stage microphone to huge units weighing hundreds of tons used in power stations, or to interconnect portions of power grids.

The third microphone, which is often a stereo microphone, is stationed inside the car to get the car interior.

That amplifier of the hardwired device also has a microphone inside of it or plugged into it.

In reality, he was producing his show from inside the studio with a microphone hanging from the window to pick up the background noises of the street below.

The car may also be equipped with an additional battery ; dual footpedal controls, such as those used by driving instruction companies ( in case the driver is wounded or incapacitated ), a PA system with a microphone and a megaphone mounted on the outside of the car, so that the driver can give commands to other convoy vehicles or bodyguards who are on foot ; fire extinguishers inside the vehicle in case the vehicle is struck by a Molotov cocktail bomb or other weapon ; a reinforced front and rear bumper, to enable the driver to ram attacking vehicles ; and additional mirrors, to give the driver a better field of view.

When playing live, he held the microphone up to the mouth of the jug, but when recording the Easter Everywhere album, the recording engineer placed a microphone inside the jug to enhance the sound.

* The electronic or electromagnetic component inside a microphone which converts acoustic energy into an electric signal.

After the implant is put into place, sound no longer travels via the ear canal and middle ear but will be picked up by a microphone and sent through the device's speech processor to the implant's electrodes inside the cochlea.

Among the more frequently seen are a miniature reel-to-reel tape recorder hidden inside the head of an electric shaver or a pack of cigarettes, and a microphone that could be embedded in a wall near the target via a shotgun-like apparatus, that used soda siphon cartridges containing CO2 as the propellant, allowing Drake to eavesdrop on conversations from a safe distance.

For example, the producers of a television or radio program might wish to produce the aural illusion that a conversation is taking place in a cave ; this effect might be accomplished by playing the recording of the conversation inside an echo chamber, with an accompanying microphone to catch the echoes.

Some poles have a microphone cable routed through the inside of the pole, which may be a regular cable protruding at the bottom end, or a coiled cable that can extend with the pole, connecting to a socket at the base that the operator plugs their microphone cable into.

After much experimentation — first with a cigar box and then a tomato can — he arrived at a solution using a microphone inside a rubber Air Force face mask, paired with a coffee pot filled with sound-absorbing material.

Each microphone has been modified so that inside its head is a tiny loudspeaker and a circuit board connected to a network of hidden control computers.

Some ear defenders employ active sound protection, in which a microphone mounted in the headset picks up ambient sounds and transmits them through a dynamic range compression circuit to earphones inside.

In binaural recording, a pair of microphones is put inside a model of a human head that includes external ears and ear canals ; each microphone is where the eardrum would be.

To play a prank on the citizens of Springfield, Bart places a radio deep inside a well and uses the microphone to trick the town into thinking a little boy is stuck in it.

* Yamaha Subkick-A reverse wired speaker mounted inside a drum shell used as a microphone to pick up low frequencies.

A model to supersede QuietComfort 2 Revision 2, both the QuietComfort 2 Revision 2 and the QuietComfort 15 share the same cosmetic design ,, however the QuietComfort 15 uses a microphone on the inside and outside of each earcup.

It has piezo pickups at the base of each string, and some also contain a separate microphone inside the soundbox, enabling the harpist to mix the signals from both kinds of pickups to produce special effects.

A modem would modulate a loudspeaker in the cup attached to the handset's microphone, and sound from the loudspeaker in the telephone handset's earpiece would be picked up by a microphone in the cup attached to the earpiece.

A voice connection such as a telephone, cellphone, or computer microphone is used to send the voice to the operator, and the real-time text is transmitted back over a modem, Internet, or other data connection.

From left to right: microphone, Apple Desktop Bus | ADB, external floppy disk drive, SCSI, printer ( serial ), modem ( serial ) and headphones.

The device came with a wireless cellular network modem, a built-in microphone with speaker and a free subscription to AT & T EasyLink Mail for both fax and e-mail messages.

The Series 3a has a NEC V30H CPU ( running at 7. 68 MHz ), a microphone for voice recording, an I / O port ( for modem, printing and PC synchronization ), and 256 kB, 512 kB, 1 MB or 2 MB of RAM.