Rockbox.org home
release
dev builds
extras
themes manual
wiki
device status forums
mailing lists
IRC bugs
patches
dev guide



Rockbox mail archive

Subject: Re: output level equalisation
From: Gajdos_at_metatem.net
Date: 2003-12-01


Just did a recording and listening test with JBR20 and 100Hz, 1kHz, and
10kHz sine tones digitally thru a Yamaha 01V console, and when the word
clock source is set correctly there are no strange tick-tick-tick sounds
here. However, the JBR locks on to the incoming S/PDIF clock only when
it's recording - not when it's playing - so one has to make sure that the
console acts as a slave to the JBR when playing, otherwise we'll get the
dreaded tick-tick-tick effect, which is caused by the difference between
un-synced clocks.

Performing the tests made me realize that it would be really nice if the
JBR's S/PDIF output could stay active even when it's not playing, because
it takes the 01V a couple of seconds to lock on to the JBR's S/PDIF
signal. Now I also notice that pausing the JBR shuts down the S/PDIF
output as well. Not nice.

Can the MAS be set up to allow the JBR to lock on to the incoming S/PDIF
even while playing, so that it can act as slave in sync with its master?

Speaking of which:
http://www.eweek.com/print_article/0,3048,a=113454,00.asp
Sorry. Couldn't resist. Please refrain from commenting on it here.

Anyway, the MP3-encoded sine tones sound really good. Actually
surprisingly good.
/JG

On Mon, 1 Dec 2003 at 22:54, ten Velde family wrote:

> I have the Recorder - but it shouldn't really matter what model I have for
> this - I'm just trying to find out how flat a frequency response I have
> using the phones output to a line in on the mixer.
>
> I tried it using unmodified sine waves, and the frequency response is
> virtually flat. The only strange thing I noticed is that when playing the
> sine waves, there were regular tick-tick-tick noises on almost all of them,
> the frequency of which differed according to which frequency sine wave I
> was playing. Must be something to do with the way MP3s are encoded, there
> was certainly no sign of these when playing the wav files on the PC.
>
> Cheers
> John



Page was last modified "Jan 10 2012" The Rockbox Crew
aaa