The Start Of A Simple Audio Scope Shell Script... Post: 302826969

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Top Forums Shell Programming and Scripting The Start Of A Simple Audio Scope Shell Script... Post 302826969 by wisecracker on Thursday 27th of June 2013 04:12:19 PM

06-27-2013

Registered User

Zoom for low signal levels is now complete.

It defaults to OFF and is never saved as part of the config file.
No user alterations are changed except switching from a real grab
to retrace mode.

From the command prompt window:-
ZOOM<CR>
(Then follow the on screen prompts.)

It has 5 depths:-
0) Default 8 bit to 4 bit quantising and uses the original plot.
1) X2, 7 bit to 4 bit quantising.
2) X4, 6 bit to 4 bit quantising.
3) X8, 5 bit ti 4 bit quantising.
4) X16, direct bit for bit display.

How it works:-
Decimal 128 is considered to be the centre point of the sound card.
Therefore a balanced signal will be centred on this number.
The minimum most point at any zoom level is shifted to give a 0(ish)
value then anything above that is the remainder of the waveform.

To keep it within the 16 vertical characters the values are divided
by an order ox 2^x depending upon the range.

None of the user coomands are available in this mode as it purely
to give an FSD for low and very low AC signal levels...

At the highest sensitivity, (4), centre point bit error will be
noticeable; this could be considered noise so be aware.

For those interetsed this is a _todo_ list:-

1) Horizontal shift control.
2) Basic frequency measurement.
3) Vertical claibration HW and SW in a similar guise to the built
in 1KHz sinewave generator.
4) DC input.
5) DC polarity.
6) Others, unknown at the moment.

Working on number 1) at the moment...

If anyone has any suggestions for any additions then please pass on
comments, all is welcome, even adverse ones...

This is now fast becoming a serious kids level application instead
of a fun project...

Enjoy...

00086.sh (34.7 KB)

Last edited by wisecracker; 07-14-2013 at 07:41 AM.. Reason: Code now an attachment.

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amt(1)								   User Commands							    amt(1)

NAME

       amt - run abstract machine test

SYNOPSIS

       amt [-s]

DESCRIPTION

       The  amt command is for use in a Common Criteria security certified system. The command is used to verify that the low level functions nec-
       essary to enforce the object reuse requirements of the Controlled Access Protection Profile are working correctly. /usr/bin/amt is a  shell
       script  that  executes  tests specific to your system. For a 32-bit system, the tests run as a 32-bit application. For a 64-bit system, the
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       amt lists test results with a pass or fail for each test it performs, unless output is suppressed with the -s option.

OPTIONS

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EXIT STATUS

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       >0    Count of the number of tests that failed.

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ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

SunOS 5.11							    19 Aug 2003 							    amt(1)