![]() The amplitude of the carrier will have an effect on how much of the modulator signal is passed, only in opposite polarity (this is different from amplitude modulation). This is because of the polarity inversion between the transformers. When the carrier is negative, the left-right pair of diodes conduct and pass the modulator signal in reverse polarity. The carrier signal's amplitude will affect how much of the modulator signal is passed (similar to amplitude modulation). When the carrier is positive, the top-bottom pair of diodes conduct and pass the modulator signal in its true polarity. Note that ring modulation carrier and modulator signals should be bipolar, meaning their amplitudes pass through moments of positive and negative values. Whatever pair is conducting at a given time will carry the audio/modulator signal through the circuit. Each diode pair is made up of opposite diodes in the ring (in the circuit diagram above, the top and bottom diodes make one pair, and the left and right diodes make the other pair). The carrier signal (which must be AC) will cause one pair of diodes to conduct electricity and effectively reverse-bias the other pair. Note that the diodes in the diode ring can face clockwise or counter-clockwise, depending on the schematic. In the following explanation, we'll be referencing the simplified circuit above in which the diodes of the diode ring point in a clockwise fashion. Ring modulators are most often seen as effects units or synthesizer modules. The carrier is another signal (often a generated sine wave oscillator). With ring modulators (particularly those concerned with the audio effect), the modulator signal is typically the input/program audio. The carrier and modulator signals of a modulation circuit could be any electrical signal. We'll discuss typical amplitude modulation and how it compares to typical ring modulation later in this article.įrequency mixing is the electrical process of creating new frequencies at an output from two signals at an input via a “frequency mixer.” In the most basic sense, which happens to be the case with ring modulation, two signals are “mixed,” and new signals are produced, made up of the sum and difference of the original signal frequencies. Let's break down that first paragraph.Īs the name suggests, amplitude modulation is technically any system/process that modulates (alters) the amplitude of one signal by another signal. It effectively creates and outputs sidebands (the sum(s) and difference(s)) of a modulator and carrier signal. In electronics (and, therefore, audio), ring modulation is a type of amplitude modulation and an implementation of frequency mixing. Frequency Mixing & The Ring Modulation Effect.Top 8 Best Ring Modulation Pedals For Guitar & Bass. ![]()
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