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In order to radiate and intercept energy efficiently, the physical size of the transmitting and receiving antennas must be an appreciable portion of the E & M wavelength.
An electromagnetic wave at an audio-frequency ... let's say 1 KHz ... has a wavelength of
( c / 1,000 ) = ( 3 x 108 / 103 ) = 3 x 105 = 300 kilometers = about 186.4 miles
Even at the nominal limit of the frequency range of hearing ... say 20 KHz ... the wavelength is
( 3 x 108 / 2 x 104 ) = 15 kilometers = 9.3 miles.
In order to have a fighting chance of successful radio communication at audio frequencies, over reasonable distances using reasonable transmit-power, the parties at each end of the link need antennas measured in miles.
There are plenty of other great reasons that we don't use radio at the physical baseband frequencies; but even of there were no others, this reason alone is a pretty potent show-stopper.
What else can I help you with?
What is audio output frequency?
Audio output frequency is that range of frequencies that can be heard. For humans, that is generally considered to be the range of 20Hz to 20kHz.
Why RC coupled amplifier is called audio amplifier?
Because radio control relies on different frequencies. Since frequencies are involved in the process, an audio amplifier can be used to amplify alternating currents (currents that change), and it does the same job.
Why is it the RC phase shift oscillators work at audio frequencies?
RC phase shift oscillators work at audio frequencies primarily due to the characteristics of the RC components used in their design. The resistors and capacitors create a phase shift that can be tuned to produce oscillations at lower frequencies, typically in the audio range (20 Hz to 20 kHz). The phase shift network, usually consisting of multiple RC stages, is designed to provide a total phase shift of 360 degrees, allowing for sustained oscillations at these frequencies. Additionally, the active components, like transistors or op-amps, ensure stable gain and feedback necessary for the oscillator's operation.
Why dont broadcast stations transmit at audio frequencies?
1) If information was transmitted at audio frequencies, then you would actually hear the signal. This would be identical to a speaker playing a song on your stereo. 2) Audio frequencies, in the world of radio frequencies, are long wave-length, low energy signals that can't travel long distances. Again, that's why you can only hear someone's stereo from within eyesight of the system. Human ears can detect from about 3Hz up to around 20KHz (some better than others). 3) True radio frequencies start at in the 100Khz range. This is your most basic radio that uses amplitude modulation (aka AM radio). Many people today that listen to the radio listen to frequency modulated (FM) stations. The difference between AM and FM is beyond the scope of the answer to this question. Being a higher frequency, the signals have more energy and can travel farther distances than audible frequencies. 4) Audible frequencies (sounds the human ear can pick up) can only "transmit" amplitude (loudness or volume) and frequency (high or low pitch). However, higher frequencies, such as those used for radio, can carry much more information than the volume and pitch of a signal. This is a direct result of radio frequencies being harmonics (integer multiples) of audible signals. For instance, if a radio signal has a frequency 20 times higher than the audio signal it is transmitting, then that radio signal can not only carry the audio signal, it can also carry other information, such as information about the broadcast station. A radio signal can "encode" information within the signal allowing more information to be carried than just the audio signal itself.
What are the applications of RC phase shift oscillator?
RC phase shift oscillators are used for musical instruments, oscillators, voice synthesis, and GPS units. They work at all audio frequencies.
How do low frequencies affect the quality of sound in audio recordings?
Low frequencies can impact the quality of sound in audio recordings by adding depth and richness to the overall sound. However, excessive low frequencies can cause muddiness and distortion, affecting the clarity and balance of the audio.
What is an audio frequency?
An audio frequency is a frequency, or range of frequencies, of audible sound waves.
What is a sentence with the word radiate in it?
An incandescent light will radiate at all frequencies.
Which audio cable is able to release all audio frequencies without causing a delay?
Audio cables don't cause delays.
Is the word audio a noun or a verb?
Audio is a noun when relating to sound or hearing. Audio is also an adjective when referring to electronic apparatus using audio frequencies
What frequencies does an audio spectrum analyzer cover?
The frequencies of a audio spectrum analyzer vary depending on the analyzer. The can perform wavelenght decomposition, harmonic analysis, note definition and many other functions.
What are the advantages of larger radio frequencies over smaller ones?
easier to transmit, higher frequencies radiate better. there is more bandwidth available at higher frequencies. higher frequencies travel in straighter lines so are more directional, this may or may not be an advantage depending on what is needed
What does the eq for sound adjustment stand for?
The EQ (equalizer) adjusts the balance of frequencies in audio signals. It typically includes sliders or knobs for adjusting bass (low frequencies), midrange (mid frequencies), and treble (high frequencies) levels to modify the sound output to suit personal preferences or to improve audio quality.
What is audible and inaudible sounds?
Inaudible sounds are sounds that you cannot hear. Audible sounds are sounds that you can hear. Frequencies capable of being heard by humans are called audio or sonic. The range is typically considered to be between 20Hz and 20,000Hz.[3] Frequencies higher than audio are referred to as ultrasonic, while frequencies below audio are referred to as infrasonic
What are ultra sonic frequencies?
Audio (sound) frequencies above the range of the human ear. This is generally said to be above 20,000 hertz.
What is meant by audio range of asound wave as applied to waves?
The audio range of a sound wave refers to the frequencies within the range of human hearing, typically around 20 Hz to 20,000 Hz. This range encompasses the frequencies that the human ear is capable of perceiving, with lower frequencies perceived as bass and higher frequencies perceived as treble. Audio equipment such as speakers and headphones are designed to reproduce sound within this range effectively.
What is audio singnal?
An audio signal is a representation of sound, typically as an electrical voltage. Audio signals have frequencies in the audio frequency range of roughly 20 to 20,000 Hz (the limits of human hearing).
