Metric Halo SpectraFoo - Manual (Page 51)

Instruments
51
The centerline on the Correlation History Meter corresponds to a correlation of 0 while the top edge corre-
sponds to +1 and the bottom to -1, respectively. The Correlation Meter in its vertical orientation can be docked
to the left side of the Correlation History Meter, providing both instantaneous and historical data in one com-
posite instrument.
Code Meter
The Code Meter is the first of three sample code metering tools included in SpectraFoo Complete. Along with
the Code Matrix Meter and the Code List Meter, they provide a comprehensive set of sample code metering
tools that can show you the nitty-gritty details of your digital signal stream. These tools can be used to check
for, among other things, DC-Offset, sample-word width, Stuck Bits, Codespace utilization, and padded clips.
They can also be used for bit-clone testing and for looking at low-level structures like dither.
Figure 3.63: 16 bit signal in the Code Meter
The Code Meter displays the range of sample codes exercised in the assigned channel in each time slice. It
shows the activity in each bit of the sample word and shows you which bits are being exercised. This can be
used to tell, for example how wide the samples in the signal are. The example above is a 16 bit signal so only
the 16 most significant bits (MSb) are being exercised.
Code Matrix Meter
The Code Matrix Meter is designed to work with 16-bit delivery media and only utilizes the top 16 bits of the
samples in the signal. The meter takes the 16-bit samples and divides them into two groups: the most significant
byte (MSB) which is the top 8 bits, and the least significant byte (LSB) which is the bottom 8 bits.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Most Significant Byte (MSB)
Least Significant Byte (LSB)
Ignored
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
= x (signed)
(unsigned) y =
Figure 3.64: Definition of the offsets in the Bit Matrix
x
y
= Origin of Matrix (x,y)
Figure 3.65: Visual of the Bit Matrix