in telephones sound waves are converted into what waves ?

Answer 1

In telephones, sound waves are converted to electrical signals. Basically, the sound waves which is carried by air will vibrate a microphone. The microphone has a diaphragm that vibrates and it generates an electrical signal that is amplified and sent. The transmission of the signal depends on the technology used. In the past, actual signals were sent. However, to have greater capacity and efficiency, compression technology is used to reduced the size of the voice signal to be carried, so various compression codecs are used.

Answer 2

If the telephone system used analog there would be a need for line amplifiers.The transducer is actually the trick here.The carbon transducer produces pulses in the 24 volt DC telephone line.It's like an active switch.Pulses of 24 VDC in varying densities are converted back to acoustic waves in another transducer.How does the telephone company produce the 12+,12- DC?I say it's with grounding rods.

Answer 3

In a traditional old-fashioned telephone, a block of coal powder is located behind the microphone membrane. Sound waves are in fact air pressure waves, so if you sing at 300 Hz it means that the microphone membrane gets pushed by high pressure and subsequently pulled by low pressure 300 times per second. When the powder gets compressed, its electric conductivity raises, so that the electric current gets stronger. Hence, that pattern of high and low air pressure is converted into a pattern of strong and weak current.

In more modern telephones, the same is achieved either by the use of capacitors or by the mean of pizo-electric crystals. A capacitor consists of two charged plates. As the air pressure force the two plates closer to each other, the voltage increases. This can be converted in to a current signal using a semiconductor. Pizo-electric crystals are crystals that gain a small voltage when they get compressed. Again, a semi-conductor is used to convert the voltage pattern into a current pattern.

In digital telephones, the current signal is ultimately converted into a digital signal (stream of zero's and ones). Using eight-bit encoding and a 20,000 Hertz sampling (for example), the pressure is registered 20,000 times per second and encoded into eight-bit signals:
11111111 - 255, or highest measurable pressure
11111110 - 254, or second highest
10000000 - 128, or intermediate pressure (that is, one atmosphere)
00000000 - 0, or lowest possible.

The signal, whether analogue (strong-weak current) or digital, is then again transformed into whatever kind of signal your telecoms provider uses. GSM, for example, uses frequency modulation (FM), which means that strong/weak current is converted into fast/slow radio waves. A traditional wired telephone line uses Amplitude Modulation, which means that the strong/weak current is transmitted literally, in principle without further conversion. If you have voice over IP via a modem, Phase Modulation is used, which means that two pulses are sent simultaneously: if they are perfectly in sync, it means that a 0 has been transmitted, while if they are slightly out of sync, it indicates a 1.

Answer 4

In your handset, the sound waves (or air pressure if you like) is first converted to a movement of a diaphgram

This is converted to electric signals. These are transmitted over the line to the central office. (If your phone is analog). There they are converted to digital signals and transmitted and the reverse takes place from then on.

Answer 5

today they are converted into digital signals not analog waves but they used to be made into oscillations in electric transmissions, electromagnetic waves. They still are but now they are bundled and compressed and shipped out as data packets and unbundled for later listening.

Answer 6

Sound waves are changed into electricity.

Answer 7

Electro-magnetic waves

Answer 8

kinetic waves