The Filmmaker's Handbook by Steven Ascher

Author:Steven Ascher
Language: eng
Format: epub, pdf
Publisher: Penguin Group USA, Inc.

Understanding Sound Level

Figure 11-5 shows a simplified representation of the level of a sound signal over time. Notice that the level is always changing, with peaks and valleys. The lower black line represents the average level. This corresponds most to how our ears perceive the loudness of sound.

Yet, there are peaks that rise quite a bit higher than the average. The upper black line shows the highest limit of the peaks. Peaks often come and go very quickly, so the ear may not fully perceive their loudness. However, we are very concerned with how high the peaks are because recording equipment can’t tolerate peaks that are too high.

Fig. 11-5. Sound levels over time. Typical sounds contain volume peaks that are higher than the average level (how much higher depends on the sound).

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