0
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.
Still curious? Ask our experts.
Chat with our AI personalities
Coach
Devin
LaoDirect 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.
Add your answer:
Earn +20 pts
What is the difference between indirect and direct measurement techniques?
Direct measurement techniques involve measuring a quantity directly, such as using a ruler to measure length. Indirect measurement techniques involve using other measurements or calculations to determine the quantity, such as using the Pythagorean theorem to find the height of a tree.
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?
Direct vision involves seeing an object directly through observation, such as looking at cells under a microscope. Indirect vision involves using instruments like mirrors or lenses to view an object that cannot be seen directly, like examining the back of the eye with an ophthalmoscope.
Is Charles law indirect or direct?
Charles's Law is a direct relationship between the temperature and volume of a gas at constant pressure. This means that as the temperature of a gas increases, its volume also increases, and vice versa.
What are the differences between direct and indirect measurement methods, and how do they impact the accuracy of the results obtained?
Direct measurement methods involve obtaining data through direct observation or physical measurement, while indirect measurement methods involve using other data or calculations to estimate the desired quantity. Direct methods are typically more accurate as they involve measuring the actual quantity of interest, while indirect methods may introduce errors due to assumptions or estimations. The choice of method can impact the accuracy of results obtained, with direct methods generally providing more precise and reliable measurements.
