sound is made from vibration
In the part of the phone that you talk in to there is a diaphragm that vibrates so it can change the vibration into digital signals.
A microphone is a device that converts sound vibrations into electrical signals in a telephone. When you speak into a phone, the microphone picks up the sound waves and converts them into electrical signals that can be transmitted through the telephone system.
Signals.
Telephone signals that are made from the binary code, which originates from the base two numbers 0 and 1
Cellular telephone signals can travel up to 22 miles.
Both telephone and data signals can be received at the same time by use of a microfilter. This device increases the data-carrying capacity of the line without disturbing the telephone signals.
how is data retrieved from the telephone? the transmitter converts the sound waves to electrical signals which are sent through the telephone network to the receiving phone. the receiving telephone converts the signals into audible sound in the receiver.
no phase shift
first modem will be modulating electrical signals in the voice frequency range of a telephone channel. These signals can be transmitted over telephone line and demodulated by another modem at the receiver side to recover the digital data.
Actually you have this backwards, the telephone lines can only carry analogue signals (voice band, 20Hz to 3KHz) not digital signals.The device that converts digital signals to analogue signals for transmission over telephone lines is called a phone MoDem(this stands for phone modulator demodulator). At the opposite end of the line it of course converts the telephone analogue signals back to digital signals.
microwaves
A current flows in telephone wires primarily to transmit voice and data signals. When a person speaks into a telephone, their voice is converted into electrical signals, which travel along the wire to the receiving end. This electrical current allows for the modulation of signals, enabling clear communication over long distances. Additionally, the current is necessary for powering components like the telephone's ringer and signaling functions.