dB Gain

Apply decibel gain

Library

Math Functions / Math Operations

dspmathops

  • dB Gain block

Description

The dB Gain block multiplies the input by the decibel values specified in the Gain parameter. For an M-by-N input matrix u with elements uij, the Gain parameter can be a real M-by-N matrix with elements gij to be multiplied element-wise with the input, or a real scalar.

yij=uij10(gij/k)

The value of k is 10 for power signals (select Power as the Input signal parameter) and 20 for voltage signals (select Amplitude as the Input signal parameter).

The value of the equivalent linear gain

gijlin=10(gij/k)

is displayed in the block icon below the dB gain value. The output is the same size as the input.

The dB Gain block supports real and complex floating-point and fixed-point data types.

Fixed-Point Data Types

The following diagram shows the data types used within the dB Gain subsystem block for fixed-point signals.

The settings for the fixed-point parameters of the Gain block in the diagram above are as follows:

  • Integer rounding mode: Floor

  • Saturate on integer overflow — unselected

  • Parameter data type mode — Inherit via internal rule

  • Output data type mode — Inherit via internal rule

See the Gain (Simulink) reference page for more information.

Parameters

Gain

The dB gain to apply to the input, a scalar or a real M-by-N matrix. Tunable (Simulink).

Input signal

The type of input signal: Power or Amplitude. Tunable (Simulink).

Note

This block does not support tunability in generated code.

Supported Data Types

  • Double-precision floating point

  • Single-precision floating point

  • Fixed point (signed and unsigned)

  • 8-, 16-, and 32-bit signed integers

  • 8-, 16-, and 32-bit unsigned integers

See Also

dB ConversionDSP System Toolbox
Math Function (Simulink)Simulink
log10MATLAB

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

Introduced before R2006a

DSP System Toolbox Documentation

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