Scribd
Upload
44 views1 page

Am Modulation

Amplitude modulation is the process of varying the amplitude of a sound wave periodically. In radio transmission, it involves modulating the amplitude of a carrier wave using an audio signal being transmitted. This produces the carrier frequency plus sidebands spaced at the frequency of the modulating signal. It is used in both radio transmission and electronic sound synthesis to alter timbre or produce tremolo effects.

Uploaded by

cuteabhi47
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
44 views1 page

Am Modulation

Amplitude modulation is the process of varying the amplitude of a sound wave periodically. In radio transmission, it involves modulating the amplitude of a carrier wave using an audio signal being transmitted. This produces the carrier frequency plus sidebands spaced at the frequency of the modulating signal. It is used in both radio transmission and electronic sound synthesis to alter timbre or produce tremolo effects.

Uploaded by

cuteabhi47
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
You are on page 1/ 1

Am modulation

The process of varying the AMPLITUDE of a sound, often periodically. An example of AM is the violinist's TREMOLO, where the amplitude of the vibrating string is rapidly altered by a movement of the bow. See also: BEATS. Compare: FREQUENCY MODULATION, PULSE, VIBRATO. In radio transmission, the process involves the MODULATION of a CARRIER wave's amplitude by the program SIGNAL being transmitted. See: MODULATED CARRIER. By analogy to the radio sense of the term, amplitude modulation is used in electronic and computer SOUND SYNTHESIS to refer to a similar process where both the carrier and the modulating signals are in the audio range, or the latter in the SUBAUDIO range. If both are pure SINE TONEs, then the SPECTRUM produced consists of the carrier frequency plus a single pair of SIDEBANDs, equally spaced about the carrier at a frequency distance equal to the modulating frequency. If the modulating signal is 8 Hz or lower, the result is a TREMOLO, whereas above about 20 Hz the TIMBRE of the tone is changed. In between these two frequencies, a transition from one effect to the other occurs. If the carrier consists of other PARTIALs, then a pair of sidebands is produced about each of them. Generally, the process is used for timbral synthesis. Ring modulation is a special case of amplitude modulation where the two signals (carrier and modulator) are multiplied together and produce only the sum and difference sidebands. See MODULATION for a sound example.

You might also like