[mythtv-commits] Ticket #2624: Modify US digital frequency tables to allow channels up to 159

[MythTV]

#2624: Modify US digital frequency tables to allow channels up to 159
----------------------------------------------+-----------------------------
 Reporter:  sphery <mtdean at thirdcontact.com>  |       Owner:  ijr    
     Type:  patch                             |      Status:  new    
 Priority:  minor                             |   Milestone:  unknown
Component:  mythtv                            |     Version:  0.20   
 Severity:  medium                            |  
----------------------------------------------+-----------------------------
 The attached patch modifies the US digital frequency tables (standard,
 HRC, and IRC) to include channels up to 159.  Currently, the HRC and IRC
 tables stop at channel 125.

 In making the change, I defined US_MAX_CHAN and EIA_542_FREQUENCY (an
 equation to compute the appropriate center frequency based on the EIA-542
 standard's definition--it requires a bandwidth, offset, and channel
 number).  This equation (with appropriate bandwidth and offset for
 standard, HRC, or IRC) is valid for any channel over 99.  Since
 US_MAX_CHAN is never likely to be reduced (and reduction to below 100
 doesn't make sense on a cable frequency table), this shouldn't be an
 issue.

 After this change, if we ever need to allow additional channels in the
 future, we simply need to modify US_MAX_CHAN.  In doing so, we'll update
 all three standards' frequency tables.

 I didn't modify channel 100's frequency (the band's starting channel) to
 use the EIA_542_FREQUENCY define, although doing so work (and would be
 easy).

-- 
Ticket URL: <http://svn.mythtv.org/trac/ticket/2624>
MythTV <http://www.mythtv.org/>
MythTV