Downloading Dsp32C Programs; Checking The Dat-Link's Filters - Townshend Computer Tools DAT-Link User Manual

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TxFSync:
The digital audio transmitter's sample-rate clock is connected to
the DSP32C's serial input with clocks generated by the DSP32C. This
mode can be used to measure the sampling frequency of output when
locked to an external clock.
TxFSync:
The digital audio receiver's sample-rate clock is connected to the
DSP32C's serial input with clocks generated by the DSP32C. This mode
can be used to measure the sampling frequency of a digital audio inputs.
The program can also be used to reset the parameters to the default state,
naset
by specifying the option. The manual page for
-c
these and other options.

10.4 Downloading DSP32C Programs

The program provides a facility for users to download their own DSP
naloaddsp
DAT-Link
programs to the
compiled and linked using AT&T's DSP32C Development System to create a COFF
executable le. Section 11.2.1 describes the interface to AT&T's software. To
download an executable named
naloaddsp -c foo
This will force the NetAudio server to use
DAT-Link
. Note that this will a ect subsequent use of the NetAudio software in-
cluding ,
naplay narecord
use with no arguments.
naloaddsp
The name of the currently loaded DSP program can also be checked using the
option to :
naloaddsp
naloaddsp -q

10.5 Checking the DAT-Link's Filters

DAT-Link
When the is used for sample-rate conversion, it must perform some low-
pass digital ltering to eliminating aliasing during the conversion process. Also,
custom lter responses can be speci ed for equalization, notch ltering, and other
special applications. If it is necessary to obtain the exact speci cations of the lter
DAT-Link
being used by the
1. Perform the operation for which you want to examine the lter. For exam-
ple, to examine the lter used for recording with conversion to 8000 sam-
ples/second, run the command:
's DSP32C processor. The DSP32C program must be
, use:
foo
during all transfers to or from the
foo
, and . To return
rctrain
, the following procedure can be used:
Utilities
in Appendix G discusses
naset
DAT-Link
to normal operation,
-q