Bug 2809 – Spectrum Analyzer should use logarithmic frequency bands

Bug 2809 - Spectrum Analyzer should use logarithmic frequency bands

Summary:

Spectrum Analyzer should use logarithmic frequency bands

Status:	RESOLVED WONTFIX

Product:	SB 2/3
Classification:	Unclassified
Component:	Graphics
Version:	65
Platform:	PC Windows XP

Importance:	P3 enhancement with 4 votes (vote)
Target Milestone:	Future
Assigned To:	Felix Mueller

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2006-01-11 08:22 UTC by alex wetmore
Modified:	2010-05-07 10:52 UTC (History)
CC List:	0 users

See Also:	16195
Category:	---

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.

Description alex wetmore 2006-01-11 08:22:14 UTC

Per your email to slim-dev the spectrum analyzer uses a linear algorithm to compute frequency bands.  It should use logarithmic bands to match commercial spectrum analyzers.

http://www.dliengineering.com/vibman/logarithmicfrequencyscaling.htm is a good article on this.  The drawing on the top has good bands to use for the narrow spectrum analyzer too (32, 64, 125, 250, 500, 1k, 2k, 4k, 8k, 16k), you could probably drop either 32hz or 16khz if you needed to make it fit.

Comment 1 Blackketter Dean 2006-04-21 21:11:08 UTC

Absolutely.

Comment 2 Dan Sully 2006-08-04 16:40:26 UTC

Richard - please retarget if you don't think this can make it in for 6.5

Thanks

Comment 3 Richard Titmuss 2006-09-15 01:31:53 UTC

I'm out of time, this won't make 6.5 now.

Comment 4 Blackketter Dean 2007-12-28 10:48:24 UTC

Alas, didn't make it for 7.0.  Will review post-release.

Comment 5 Alan Young 2010-05-07 10:52:51 UTC

All new Squeezebox products are likely to be based on the SqueezePlay platform.
We do not plan to implement any further enhancements to the ip3k firmware or
which are targeted specifically at ip3k-based products.