What is the difference between wideband and narrowband FM?

What is the difference between wideband and narrowband FM?

Definition. – Narrowband refers to radio communications that carry signals in a narrow band of frequencies. Wideband, on the other hand, refers to a broader frequency communication channel that uses a relatively wide range of frequencies.

What is the difference between NBFM and WBFM?

When spectrum efficiency is important, Narrowband FM (NBFM) is used but when better signal quality is required, Wideband FM (WBFM) is used at the expense of greater spectrum usage. The term WBFM is used in applications where the modulation index is equal to or larger than 1.

How is narrow band FM converted to wideband FM?

The narrowband FM modulator generates a narrowband FM signal using simple components such as an integrator (an OpAmp), oscillators, multipliers, and adders. The generated narrowband FM signal can be converted to a wideband FM signal by simply passing it through a non–linear device with power P.

What is the condition for narrowband FM signal and wideband FM signal?

Frequency modulation can be classified as narrowband if the change in the carrier frequency is about the same as the signal frequency, or as wideband if the change in the carrier frequency is much higher (modulation index > 1) than the signal frequency.

What is the bandwidth of narrow band FM?

Hence, it is Narrow Band FM. The formula for Bandwidth of Narrow Band FM is the same as that of AM wave. Substitute fm value in the above formula. Therefore, the bandwidth of Narrow Band FM wave is 4KHz.

What is the range of wideband?

Wideband in this context is usually considered to cover frequencies in the range of 50–7,000 Hz, therefore allowing audio with richer tones and better quality.

What is the modulation index of wideband FM?

Wideband FM. For large values of modulation index m f , the FM wave ideally contains the carrier and an infinite number of sidebands located symmetrically around the carrier. Such a FM wave has infinite bandwidth and hence called as wideband FM. The modulation index of wideband FM is higher than 1.

What makes a FM signal a narrow band?

The term kf x(t) represents the frequency deviation . The constant kf will control the deviation . For small values of kf , the frequency deviation is small and the spectrum of FM signal has a narrow band . Hence, it is called as the narrow band FM .

What’s the difference between NBFM and wide band FM?

NBFM allows many more channels to be fitted into a given band, and is adequate for speech. WBFM is what is used for broadcast FM. NBFM is used for 2-way short range radio devices. What separates narrow band FM from wide band FM is the ratio of maximum peak carrier deviation:maximum modulating frequency.

Which is the maximum permissible deviation for wideband FM?

The modulation index of wideband FM is higher than 1. The maximum permissible deviation is 75 kHz and it is used in the entertainment broadcasting applications such as FM radio, TV etc. The expression for the wideband FM is complex since it is sine of sine function. The only way to solve this equation is by using the Bessel functions.