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Which radio signals past through metal metal vhf lf FM or am or phase modulation?
Wiki User
∙ 10y ago
No radio signals pass through metal. But depending on their wavelength,
they may diffract more or less efficiently around the edges and be detectable
on the other side.
Wiki User
∙ 10y ago
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In phase modulation the amount of phase shift in the carrier signal depends on the of the modulating signal and the rate of phase shift depends on the of the modulating signal?
Amplitude Frequency
What is the Comparison of frequency modulation and amplitude modulation?
I will answer this in the simplest way I know in the application I use it in; this would be in audio applications. Amplitude modulation is modulation of a carrier source's loudness; Frequency modulation is modulation of a carrier source's pitch; and Phase modulation is modulation of a carrier source's duty cycle/symmetry/timbre. One can often notice that all 3 modulation types relate in some way with another in that when frequency rises and falls it typically makes it favorable for either a rise in loudness or timbre. The most analog way to understand it in nature is typically your small vowel sounds like "iiiiiiiiiiiiii" as in the American-English word 'easy' and 'eeeeeeeeeeee' as in 'edge' are easier to say with loudness at higher pitches; medium vowel sounds like 'uuuuuuuuuuu' as in 'Utter' or 'sOn' and 'aaaaaaaaaaaa' as in 'Awe' *chuckles* are easier to say with loudness at medium pitches; large vowel sounds like 'ooooooooooo' as in 'Oh' and 'uuuuuuuuuuuu' as in 'rUne' are easier to say with loudness at lower pitches. AM is often known as 'tremolo'; FM is often known as 'vibrato'; PM is often known as 'wow'; AM/FM is 'vibremelo' and fill in the blanks for the other sub-variants. Maikel Stellerfield
Is it possible to transmit a digital signal coded as square wave as used inside a computer using radio transmission without loss?
Digital signals are regularly transmitted by radio systems. The traditional way of doing it was by frequency-shift keying (FSK) where the frequency was changed slightly between two states which represented logical 0 and 1. Another method uses phase-shift keying (PSK) which uses two phase states of the carrier wave to represent 0 and 1. The main issue in transmitting data by radio is the bandwidth, and with 2-state modulation like FSK or PSK the bandwidth must exceed the bit rate. Another important issue is signal-to-noise ratio because radio signals can become very weak over long distances. Alternative systems are now available in which the modulation can have more than 2 states. For example four alternative phase states instead of two can be used for each symbol, which allows 4 bits to be transmitted per symbol instead of two, so the data rate is doubled for the same bandwidth. General quadature-amplitude modulation (QAM) keying employs M amplitude states and N phase states to transmit MN bits in each symbol. This might seem a good idea but the disadvantage with using high values of M and/or N is that it requires a very high signal-to-noise ratio. A popular choice of modulation for data transmission using radio links in which the bandwidth and the signal strength are limited is quadrature phase-shift keying (QPSK) which provides a good compromise between data rate, bandwidth and signal-to-noise ratio.
How are radio television signals added to EM radio wave?
The process of adding information onto a bare radio wave is called "modulation". It means changing something on the wave ... either its amplitude, frequency, or phase, or actually turning it on and off ... according to a pattern that the transmitting person and the receiving person have worked out and agreed to, so that when the transmitting person makes changes to the wave, the receiving person can figure out what those changes mean.
How radio waves are transmitted?
In a radio station, the signals start out at a low-level. On the order of a few hundred millivolts, signals come from a computer's soundcard, or a CD player, nowdays it is almost guaranteed to be some Digital-to-Analog Converter (DAC). These signals are fed into a mixer, where they are combined with other similar signals, and those from the DJ's microphones (also very low level, but amplified first by a Mic pre-amp). The final mix from the mixer is then fed to a RF modulator/amplifier. Here, the signal is first modulated. That is, it is combined with a carrier signal. For example 100.5 FM starts with a 100.5 MHz sinewave. Then it is frequency-modulated by the audio signals from the mixer. In FM, the input signal (audio) causes instantaneous variations in the frequency of the carrier. See the FM Modulation link. Modulation is necessary to carry the signal through the air. Audio waves (20Hz - 20kHz) have such a large wavelength that they would require unbelievably large antennas to broadcast/receive. This modulated signal is then amplified from several mW (.001 Watt) to several kW (1,000 Watts). Then it is carried to the antenna on the radio tower, where it is transmitted through the air.
Application of signals and systems?
what is phase modulation changing of the phase depending upon the modulated signal is said to be a phase modulation
PLL is used for demodulation of?
Carrier signals that carry information by the process of frequency- or phase-modulation.
What is the difference between frequency modulation and phase modulation?
The difference between frequency modulation and phase modulation is that with frequency modulation the angular frequency of the signal is modified while with the phase modulation, the phase angle of the signal is modified.
What are the two types of angle modulation?
Frequency Modulation and Phase Modulation
What has the author Charles Richard Abbey written?
Charles Richard Abbey has written: 'Detection of phase-modulated signals using digital techniques' -- subject(s): Phase modulation
Why frequency modulation and phase modulation are called angle modulation?
i dont know ans. of this.
In which Analog to analog modulation methods does the peak amplitude?
Frequency modulation Phase modulation
How does quadrature amplitude modulation works?
QAM is a combination of phase modulation & amplitude modulation.
How Phase modulation and frequency modulation are inseparable?
both are related because phase is an integral function of frequency
What are the advantages and disadvantages of phase modulation?
Advantage - 1. Phase modulation & demodulation is easy compared to Frequency modulation. 2. Phase modulator is used in determining velocity of moving target by extracting Doppler information. Doppler information needs stable carrier which is possible in phase modulation but not in frequency modulation. Disadvantage - 1. Phase ambiguity comes if we exceed its modulation index pi radian(180 degree). 2. we need frequency multiplier to increase phase modulation index. Visit my website http://harshit.org
How phase lock loop is used as a universal detector for Amplitude Modulation?
I could certainly be wrong, but my recollection is that a phase locked loopis a universal detector for Frequency and Phase modulation, and is quiteinsensitive to Amplitude modulation.
Why phase modulation is used?
Actually phase modulation was used for the color signal in all analog TV systems.Phase modulation, with some signal preprocessing, was used to indirectly get frequency modulation in many FM transmitters.Certain modems use phase amplitude modulation.etc.
