Topic: iriver H1xx Tapers FAQ (beta)

[whatboutbob]

Up to 24dB gain in 3dB increments is analog. Between the 3dB increments are .5dB digital steps.  24dB upwards is digital.  In my experience, if you have a choice between the analog iriver gain and post, I'd go iriver up to 24dB.  I've rarely (well...twice) had to use more than that...both times with a remote attached to my regret, so its not a fair comparison.

Ages ago I read a damn good reason to use iriver digital gain over post, but I can't for the life of me recall why...was it something to do with bitrate...?  Gah...anyone care to step in?

[Patrick]

So, is it fair to say that the remote puts diginoise in your recordings EVERY time you use it?  Does it matter if you're running analog or digital in?

[Humbug]

Up to 24dB gain in 3dB increments is analog. Between the 3dB increments are .5dB digital steps.  24dB upwards is digital.  In my experience, if you have a choice between the analog iriver gain and post, I'd go iriver up to 24dB.  I've rarely (well...twice) had to use more than that...both times with a remote attached to my regret, so its not a fair comparison.

Ages ago I read a damn good reason to use iriver digital gain over post, but I can't for the life of me recall why...was it something to do with bitrate...?  Gah...anyone care to step in?

Thanks for the reply, makes sense now! +t

I guess the FAQ will eventually end up in the archive?

[BayTaynt3d]

Up to 24dB gain in 3dB increments is analog. Between the 3dB increments are .5dB digital steps.  24dB upwards is digital.  In my experience, if you have a choice between the analog iriver gain and post, I'd go iriver up to 24dB.  I've rarely (well...twice) had to use more than that...both times with a remote attached to my regret, so its not a fair comparison.

Ages ago I read a damn good reason to use iriver digital gain over post, but I can't for the life of me recall why...was it something to do with bitrate...?  Gah...anyone care to step in?

So, this to me says whenever possible stay between 0 and 24 gain and do it in steps divisible by 3. That rule will keep you purely in the analog gain world. I can see some benefit to digitally scaling down from the 3 db steps to get .5 steps, but I can't think of any reason why I'd want to use digital gain above 24 db ever -- I can do that in post, and I can probably do it with much higher-end algorithms and less quantization noise (especially if I'm doing any other processing in addition to normalizing). But, that is good info to know. In fact, I'd love to be able to set some bounds on the gain like from 0 to 24 (nothing higher and nothing lower, because either seems pretty pointless too me, but maybe I'm missing something here?).

[Scooter]

So is anyone else running with the REP installed? If so, what build/patch is most stable with REP?

I'm using REP, but i don't have the 120 w/ me right now, so i can't report the build/patch.  works great for me.

[china_rider]

Here is a link to the thread about the REP.  The creator of the pack created it.  You will notice in his sig there is always a link to the precompiled version he uses.  Since there was a rockbox enhancement freeze I would always stay current with the REP build since the changes were not all included in rockbox.  Not sure if they are in there now since the freeze has been lifted.  Below is the link... I've never had problems with his builds (and have confidence in it since he runs it himself).

http://forums.rockbox.org/index.php?topic=2513.0

[shaggy]

I think mmmm's AGC is gonna get committed.

[petur]

Ages ago I read a damn good reason to use iriver digital gain over post, but I can't for the life of me recall why...was it something to do with bitrate...?  Gah...anyone care to step in?

Not ages ago

The reason is that the decimator works on the internal ADC data, which is >16bit. It's only after this process that the data is converted to 16bit and transferred to the main cpu (which buffers and writes to disk).

I think mmmm's AGC is gonna get committed.

We're working on it

[whatboutbob]

well..."ages" by my memory which..well...compares unfavourably to a goldfish's.

So there you go tho folks...digital decimation may still be better than post.  How can we do a comparison?

[whatboutbob]

AGC is now in CVS...which means it'll be in the daily builds.  I'm yet to use it...but the safety function looks promising for stealthers. iirc it simply decreases gain when a user-prescribed period of clipping is detected.

[petur]

NOTE: recording keyhandling code has been upgraded this weekend (not by me), haven't tested myself but it should be working. Just be warned that you check everything out when upgrading to the latest version.

[gmm6797]

Anyone know if it is possible to record an RM broadcase from this unit to itself?  IE: if I am listening to FM, can I record to the iRiver as well?

[jeromejello]

Anyone know if it is possible to record an RM broadcase from this unit to itself?  IE: if I am listening to FM, can I record to the iRiver as well?

it is possible in non rockboxed units, i dont know about the RB though... i am still figuring out this thing... it sure is nice

[whatboutbob]

It is possible in rockbox.  I forget how tho, cos I don’t listen to radio (helpful, I know).

I think you go into the FM screen then go into the recording screen (via A-B button) while radio is still on…*shrug*

If that doesn’t work, search the rockbox and/or misticriver forums…I’ve seen posts on how to do it there.

Oh, btw, there’s now a ‘recording’ sub-forum in the rockbox forums…kinda cool.

[cgrooves]

I think you got it right, Bob.  I've only tried it once, though.  Definitely can be done with Rockbox.