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Indirect FM generation first produces a narrow-band (relatively low bandwidth/frequency) FM wave, often created using an integrator, a signal multiplier, a phase shifter, and a summer. Then, it multiplies and mixes this wave's frequency properties to achieve the desired frequency deviation and carrier frequency.
Direct FM generation uses a voltage-controlled oscillator (VCO) to generate the wide-band FM signal directly. The VCO often consists of an oscillator with a variable capacitance or inductance that allows the resonant frequency to vary with the applied voltage.
Direct FM generation has poor frequency stability, so it requires feedback to stabilize this, which complicates the system. Indirect FM generation has good frequency stability, but is noisier since the noise is multiplied during the frequency multiplication.
Choosing one over the other depends on what components are available and how the importance of system/signal characteristics is weighted.
Direct generation of FM waves involves directly modulating the frequency of a carrier wave without any intermediate conversion process. Indirect generation of FM waves involves first converting the audio signal into an intermediary signal, such as a voltage or current signal, which is then used to modulate the carrier wave's frequency.
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What renable energy is indirect?
Hydropower is considered an indirect form of renewable energy because it relies on the water cycle to generate electricity. Solar and wind power are examples of direct renewable energy sources that rely on their respective natural sources for power generation.
What is the difference between direct and indirect vision in science?
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Do direct Rays heat a place more than indirect rays?
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Difference between direct and indirect address instruction?
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What is the difference between direct and indirect correlation in statistics?
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if hernia tissu pass thrw ing.ring that is indirect ing.hernia.if it is pass thrw abdominal wall that is direct ing.herniaif hernia tissu pass thrw ing.ring that is indirect ing.hernia.if it is pass thrw abdominal wall that is direct ing.herniathe difference between direct hernia and indirect hernia is the direct hernia only affected the superficial inguinal ring and the indirect is affected the deep inguinal ringthe difference between direct hernia and indirect hernia is the direct hernia only affected the superficial inguinal ring and the indirect is affected the deep inguinal ring
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direct democracy is when each person rules and indirect is when people vote for people who rule.
