Convert between logarithmic (dB) and linear domains for backscatter values.

The linear function converts a value from the logarithmic (dB) domain to the linear domain, while the db function converts a value from the linear domain to the logarithmic (dB) domain. These are commonly used for target strength (TS) and backscattering coefficient ($\sigma_{bs}$) conversions.

The conversions are defined as: $$\text{linear}(x) = c^{x / c}$$ $$\text{db}(x) = c \log_c(x)$$ where $c$ is the coefficient (default 10).

Usage

linear(value, coefficient = 10)

db(value, coefficient = 10)

Arguments

value: Numeric value to convert. For linear, this is a logarithmic value (e.g., dB TS); for db, this is a linear value (e.g., $\sigma_{bs}$).
coefficient: Optional. Numeric coefficient (base) for the logarithm. Default is 10.

Value

For linear, returns the value converted to the linear domain. For db, returns the value converted to the logarithmic (dB) domain.