MUXIN

MUXIN - input signal pre-processor

Usage:

MUXIN SEL L A B PAR SR OUT A B X Y LX LY PLX PLY

Inputs:

SEL

The X/Y signal selection (number)

L

The frame length (number)

A,B

The input signals A, B (vector)

PAR

The processing parameters (vector). See the pre/post processing table notes for details.

SR

The sampling rate in Hz (number)

Outputs:

A,B

The pre-processed input signals A, B

X,Y

The signals selected by SEL

LX

The level X (number) in dB

LY

The level Y (number) in dB

PLX

The peak level X (number) in dB

PLY

The peak level Y (number) in dB

Function:

Pre-processor, multiplexer and level-meter for input signals.

Notes:

Pre-processing is applied to A and B before selection.

The peak level outputs PLX and PLY are the overall maximum values of PX and PY.

To reset the peak values, use the reset value of the parameter table PAR.

X/Y Selection:

SEL	X	Y	Description
0	A	B	mono A
1	B	B	mono B
2	A+B	A+B	mono sum
3	A-B	A-B	mono difference
4	A	B	stereo
5	B	A	stereo reverse
6	A+B	A-B	stereo sum/difference

Pre/Post-processing and ppm-evaluation used by MUXIn and MUXOUT

The parameters 0-11 are used to control the processing modules which compute Ay(Ax) and By(Bx), and the parameters 12-14 control the ppm computation.

Parameter Table:

Index	Module	Description
0	AMP	linear gain factor for signal A
1	AMP	linear gain factor signal B
2	FLT	filter mode:0 - off (no filter)1 - filter channel A2 - filter channel B3 - filter both channels
3	FLT	relative filter cutoff frequency (kcut):0 - no filter0 > kcut >= -1 - lowpass (fcut - (1+kcut) * srate/2)0 < kcut <= 1 - highpass (fcut = (1-kcut) * srate/2)
4	AGC	compression / expansion mode0 - off (no agc)1 - apply agc to channel A2 - apply agc to channel B3 - apply agc to both channels4 - apply agc to both channels with synchronous gain control
5	AGC	compression start amplitude (ac) in dB (ac >= ax)
6	AGC	compression gain slope (kc) (0 <= kc <= 1)
7	AGC	expansion start amplitude (ax) in dB (ax <= ac)
8	AGC	expansion gain slope (kx) (0 <= kx <= 1)
9	AGC	gain control averaging time (ta) in seconds (0.01 <= ta <= 0.2)
10	AGC	gain control slope duration (tg) in seconds (0.01 <= tg <= 0.2)
11	AGC	gain step (dg) in dB (0.5 <= dg <= 3)
12	PPM	ppm output mode0 - rms1 - peak
13	PPM	ppm average time (tavr) in seconds (0.1 <= tavr < 1)
14	PPM	reset peak values (pulse)0 - continue1 - reset