Block

Mask

Description

This block computes the average of a normalized input signal, along with the average of its square. The input signal must be within the range -1 to 1. This block shares FPGA resources to apply the computation to two input channels.

Parameters

This block has no parameter.

Inputs

Ain_0	This port should be fed with the first input signal, on which the mean-square and average measurement will be applied.
Ain_1	This port should be fed with the second input signal, on which the mean-square and average measurement will be applied.
RMSAvgGain	This can be used to provide a gain to apply to both input signals to enhance their dynamic range/resolution to fill optimally the [-1, +1] range.
Sync	This synchronization signal triggers the measurement of new values for the mean-square and average outputs. Seven clock cycles are necessary to output the new values. The new values arrival is notified by the 33rd bit of the outputs being active for a one-cycle pulse.

Outputs

MeanSquare_Ch1_Ch0

The output gives the average square value of both input signals. RMS value can be obtained by applying the square-root of these values. Bit assignations are the following:

Bit 32 Data ready flag
Bits 16-31 Mean-square of input Ain_1, in the Fix16_15 format
Bits 0-15 Mean-square of input Ain_0, in the Fix16_15 format

Average_Ch1_Ch0

The output gives the average value of both input signals. Bit assignations are the following:

Bit 32 Data ready flag
Bits 16-31 Average of input Ain_1, in the Fix16_15 format
Bits 0-15 Average of input Ain_0, in the Fix16_15 format

Characteristics and Limitations

This block has no special characteristics.

Direct Feedthrough	N/A
Discrete sample time	N/A
XHP support	N/A
Work offline	YES

RT-XSG Documentation

Mean Square and Average Measurement 2 Channels