Equivalent Continuous Sound Pressure Level Calculator

Leq Formula:

\[ L_{eq} = 10 \log_{10} \left( \frac{1}{T} \int_0^T 10^{0.1 L(t)} dt \right) \]

Equivalent Continuous Sound Level (L_eq):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Equivalent Continuous Sound Pressure Level?

The Equivalent Continuous Sound Pressure Level (L_eq) is the constant sound level that would produce the same total sound energy as the actual fluctuating sound over the same time period. It's a key metric in noise measurement and environmental acoustics.

2. How Does the Calculator Work?

The calculator uses the Leq formula:

\[ L_{eq} = 10 \log_{10} \left( \frac{1}{T} \int_0^T 10^{0.1 L(t)} dt \right) \]

Where:

\( L_{eq} \) — Equivalent continuous sound level (dB)
\( T \) — Measurement duration (seconds)
\( L(t) \) — Instantaneous sound pressure level (dB)

Explanation: The equation calculates the energy mean of sound levels over time, providing a single value that represents the total sound energy exposure.

3. Importance of Leq Calculation

Details: Leq is crucial for noise assessment in occupational health, environmental monitoring, and community noise regulations. It helps quantify noise exposure for compliance with safety standards and regulations.

4. Using the Calculator

Tips: Enter the measurement duration in seconds and provide sound level measurements as comma-separated values. For best results, use measurements taken at regular intervals throughout the measurement period.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between Leq and Lmax?
A: Leq represents the average sound energy over time, while Lmax indicates the maximum sound level reached during the measurement period.

Q2: How often should measurements be taken for accurate Leq calculation?
A: For fluctuating sounds, measurements should be taken frequently enough to capture the variations. Many sound level meters can calculate Leq directly with continuous measurement.

Q3: What time period is typically used for Leq measurements?
A: Common periods include 1 hour (L_eq,1h), 8 hours (L_eq,8h for occupational exposure), and 24 hours (L_eq,24h for environmental noise).

Q4: Can Leq be used for impulse noise?
A: Yes, Leq accounts for all sound energy, including impulse noise, making it suitable for measuring impact sounds like hammer blows or gunshots.

Q5: How does Leq relate to noise dose calculations?
A: Leq is the fundamental measurement from which noise exposure doses are calculated, particularly in occupational settings where percentages of allowable exposure are determined.