0
There are more than one type of loud speaker but the most common is a coil of wire suspended in a magnetic field. When alternating currents are passed through the wire, resulting vibrating magnetic fields push and pull against the permanent magnet. The coil is connected to a surface, usually conical, which moves back and forth because of this pushing and pulling causing sympathetic sound vibrations in the air adjacent to this surface which then move away as sound waves.
Still curious? Ask our experts.
Chat with our AI personalities
Steve
Professor
EzraA loudspeaker has a coil that is attached to the speaker's cone. The electrical signal from the amplifier goes through this coil. This signal current produces a magnetic field in response to the signal. There is a permanent magnet also at the back of the speaker. The magnetic field from the coil either pushes or pulls in relation to the magnetic field in the permanent magnet, causing a mechanical motion of the speaker cone, producing sound pressure changing when the cone moves the air around it.
Add your answer:
Earn +20 pts
What are the devices which converts sound signal into electrical signal other than microphone?
One is the hydrophone, used to pick up sound waves underwater.
Is it possible to convert voice signal into electrical energy in mobile phones?
In principle, yes, but you wouldn't want to wait around to do the job that way. Human ears are very sensitive, and the sounds around you carry very little energy compared to the energy used by common electrical gadgets. One or two watts of pure tone from a loudspeaker will drive you out of the living room, and the "ear buds" are blasting no more than a few milliwatts of sound power into your ear canals. You could hang a microphone out of your window, and use the sounds of traffic as you drive. It might charge your cellphone in a couple of weeks ... if you leave the phone turned off and don't use it.
Which is the best moving coil type instrument to convert sound to electricity?
IF you use speaker as microphone, you can use it as a transducer to convert soun energy into electrical signals
What are the applications of a capacitive transducer?
Capacitive sensors are used mainly to detect proximity, usually that of people. The operating principle is that the capacitance of the capacitor varies as material comes between the two plates of the capacitor, and you can determine the presence of something via the measurement of the capacitance.
What is difference between transducer and transmitter?
today the general rule of thumb is that if the pressure sensor has a millivolt (e.g. 30mV or 100mV) or non-amplified output it is a pressure transducer. If the pressure sensor has a voltage (e.g. 0-5Vdc, 0-10Vdc or 1-5Vdc) output it is an amplified voltage output pressure transducer. If a pressure sensor has a current loop output (e.g. 2 wire 4-20mA or 3 wire 0/4-20mA) it is a pressure transmitter. Simply we can tell as Transducer: Any physical Quantity is converted into Electrical Signal. Transmitter: to make the amplified RF electrical signal to radiation with help of Electric and maganetic signal.
