Issue 18212: Meaning of vsip_symmetry enum values inconsistent (vsiplxx-rtf)
Source:  (Mr. Brooks Moses, brooks.moses(at)dpdx.net)
Nature: Revision
Severity: Minor
Summary: The vsip_symmetry enumerator is used in a number of places, and in
general the VSIP_SYM_EVEN_LEN_* values are defined as "(Even) Symmetric,
{odd,even} length".


However, in the text there are sporadic mentions that imply that
symmetric here really means conjugate-symmetric; for instance, see the
bottom of page 567 ("The filter kernel can be even (conjugate) symmetric
or non-symmetric.") and the definition of the "kernel" argument to
vsip_*fir_create on page 612.  This needs to be much more clearly and
consistently stated.


Regardless of whether the kernel is defined as symmetric or
conjugate-symmetric, the method for constructing the complete kernel
from the input in the symmetric cases is not defined.  Is the input the
first half of the kernel, or the second half?  Is the first half
conjugated, or the second half?  This needs to be clearly specified.


Resolution: In the interest of closing the current RTF so that the solutions to resolved issues can be made publically available, this issue is deferred to the next RTF.
Disposition: Deferred
Revised Text: 
Actions taken:
October 23, 2012: received issue
Discussion: 

End of Annotations:=====
te: Tue, 23 Oct 2012 12:37:11 -0700
From: Brooks Moses <brooks_moses@mentor.com>
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2
To: <issues@omg.org>
Subject: VSIPL issue (#3 from me for VSIPL)
X-OriginalArrivalTime: 23 Oct 2012 19:37:11.0413 (UTC) FILETIME=[CBDBD250:01CDB155]


Name:            Brooks Moses
Employer:        Mentor Graphics
mailFrom:        brooks_moses@mentor.com
Terms_Agreement: I agree
Specification:   VSIPL
Section:         7.2.4 Filter Functions
FormalNumber:    ptc/2012-07-26
Version:         1.4 - FTF Beta 1
Doc_Year:        2012
Doc_Month:       August
Doc_Day:         10
Page:            567, 612, and others
Title:           Meaning of vsip_symmetry enum values inconsistent
Nature:          Bug
Severity:        Minor
B1:              Report Issue


Description:


The vsip_symmetry enumerator is used in a number of places, and in
general the VSIP_SYM_EVEN_LEN_* values are defined as "(Even) Symmetric,
{odd,even} length".


However, in the text there are sporadic mentions that imply that
symmetric here really means conjugate-symmetric; for instance, see the
bottom of page 567 ("The filter kernel can be even (conjugate) symmetric
or non-symmetric.") and the definition of the "kernel" argument to
vsip_*fir_create on page 612.  This needs to be much more clearly and
consistently stated.


Regardless of whether the kernel is defined as symmetric or
conjugate-symmetric, the method for constructing the complete kernel
from the input in the symmetric cases is not defined.  Is the input the
first half of the kernel, or the second half?  Is the first half
conjugated, or the second half?  This needs to be clearly specified.

- Brooks