Enabling Peak Hold Trace
The Peak Hold Trace can be activated using a checkbox in the Advanced Analyzer menu. It’s time constants Forever, Slow, Fast can be selected in the normal Analyzer Settings Menu. The peak hold trace is reset by choosing Delete for the corresponding trace in the trace list.
To activate the Peak Hold Trace:
- Open the Advanced Settings, and enable Peak Trace feature on the Analyzer tab.
You need to enable a checkbox located in the “Advanced Analyzer” setting.
Setting Time Constants
You can configure desired time constants for the Peak Hold Trace, such as “Forever,” “Slow,” or “Fast” in the Analyzer Settings window.
If you wish to reset the Peak Hold Trace, you can choose the “Delete” option for the corresponding trace in the trace list.
Weighting on Captured Traces
The A-weighting, B-weighting, C-weighting and D-weighting are different frequency weightings that simulate how sensitive various frequencies are to the human ear.
- A-weighting (dB(A)): A-weighting is used to approximate the sensitivity of the human ear to different frequencies at low sound pressure levels. It reduces the contribution of low and high frequencies to better represent the way humans perceive sound in relatively quiet environments. A-weighted measurements are often used in assessing environmental noise levels and evaluating noise exposure limits for occupational health and safety.
- B-weighting (dB(B)): B-weighting is rarely used and has limited practical application. It was initially intended to approximate the ear’s sensitivity at moderate sound pressure levels, but it didn’t gain widespread acceptance due to certain limitations. A-weighting has largely taken the place of B-weighting in modern applications..
- C-weighting (dB(C)): C-weighting is used to measure the overall sound pressure level without any frequency weighting. It includes the entire audible frequency range and does not attenuate any specific frequencies. C-weighted measurements are commonly employed in situations where a flat frequency response is desired or when assessing high-level noise sources, such as loudspeakers or industrial machinery.
- D-weighting(dB(D)): D Weighting is used to measure sound pressure levels with a frequency weighting that is specifically designed to reflect the human ear’s sensitivity to loud noises, particularly in the presence of high-level aircraft noise. Unlike C-weighting, D-weighting emphasizes certain frequency ranges to better correlate with the subjective perception of aircraft noise.
Weighting feature is used to adjust measurements to better align with the perceived loudness by human listeners.
When you select the “Trace Settings” option in the Traces toolbar, a new window will open, allowing you to choose the desired Weighting (Flat/Unweighted, A, B, C, and D).
Based on desired selection weighting will be applied to all captured traces. Each trace RMS SPL value will be displayed in traces view as shown below.
Trace Properties
You can modify all the captured traces. Double-click on the trace to open Trace properties window.
On the Trace properties window you can modify the following property.
- Name of the trace
- Offset value
- Color
- Comment, the provided comment will be exported and imported along with trace.
Smoothing on Captured Traces
Smoothing is a technique that reduces variations in plotted curves to improve the visual perception of trends or patterns in frequency response or level measurements. It is commonly used in audio analysis and equalization tasks to enhance clarity while considering the trade-off between noise reduction and preservation of important details.
When you select the “Trace Settings” option in the Traces toolbar, a new window will open, where you can select desired octave banding for smoothing. Based on desired selection smoothing will be applied to all captured traces.
The smoothed curve with the chosen option looks like below figure.
