The Bark scale is linear below 500 Hz and logarithmic above it.

Evidence

Both scales are presented as logarithmic functions of frequency in Figure 9.19. The Bark scale is linear up to about 500 Hz, as was seen in Figure 9.15. Above 500 Hz it is roughly logarithmic. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1052

Categorization

• DEFINE: Defines the Bark scale’s specific linear-to-logarithmic behavior, which is core acoustic perception vocabulary.