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Difference Between Data Rate and Bandwidth


Difference Between Data Rate and Bandwidth

Data Rate Bandwidth Comparison Relationship

1. Data Rate Equation

Data rate (bit rate) is the number of bits transmitted per second.

Rb = n × fs

Where:

  • Rb = Data rate (bps)
  • n = Bits per sample
  • fs = Sampling frequency

Example

n = 8 bits/sample
fs = 8 kHz

Rb = 8 × 8000 = 64000 bps = 64 kbps

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2. Bandwidth Equation

Bandwidth is the frequency range needed to transmit the signal.

B = Rb / 2

(Minimum Nyquist bandwidth)

Sometimes approximately:

B ≈ Rb

Depending on the encoding or modulation technique used.

Main Difference

Quantity Meaning Unit
Data Rate (Rb) Bits transmitted per second bps
Bandwidth (B) Frequency spectrum occupied Hz

Relationship

Bandwidth depends on data rate and modulation scheme.

Higher data rate usually requires larger bandwidth.

Example

Data rate = 64 kbps

B = 64k / 2 = 32 kHz

Simple Intuition

  • Data Rate → How much information per second?
  • Bandwidth → How much frequency space is needed?

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