Table 1 Requirements toward the noise reduction subsystem

1

The noise reduction shall apply attenuation

1.1

Attenuation shall depend on modulation

1.1.1

The dependency between modulation depth (m) and attenuation (a) shall be as follows: $\frac{a}{dB}=\{\begin{array}{ll}{A}_0\hfill & ;m\le M_1\hfill \\ A_0\cdot \left(1-\frac{m-M_1}{M_2-M_1}\right)\hfill & ;m\in ]M_1,M_2[\hfill \\ 0\hfill & ;\text{else}\hfill \end{array}$

(See Figure 1)

[3, 12]

1.1.2

The noise reduction shall be sensitive to modulation frequencies in range [1-12 Hz]

[1]

1.2

Attenuation shall be applied in individual subbands

[3]

1.2.1

The crossover frequencies shall be { List of frequencies }

1.3

The attenuation by the noise reduction shall be superposed linearly with other attenuations in the system