Mic hiss

Post your questions & get help from friendly LibriVoxers
Post Reply
ccfpcl
Posts: 243
Joined: June 13th, 2013, 7:36 am

Post by ccfpcl » June 20th, 2013, 2:58 am

Hi all

Have just 'upgraded' from a digital mic on my SKYPE headset to a Samson Q1U, as recommended in the LV hardware Wiki.

Whereas the digital mic was pretty much completely silent at LV recording levels (42dB), the Samson has audible hiss which fails the checker (50dB) and therefore requires a noise reduction step.

This doesn't feel like an upgrade to me, as it adds steps to the process and the noise reduction inevitably affects the voice recording. Is there something I'm doing wrong, or is this just a fact of life because the Samson is an analogue mic, and a tradeoff you make in exchange for better frequency response?

PS I'm using the Samson on a boom stand and with a plosive screen, and talking straight into it from about 9in away.

Thanks, Chris.

annise
LibriVox Admin Team
Posts: 32124
Joined: April 3rd, 2008, 3:55 am
Location: Melbourne,Australia

Post by annise » June 20th, 2013, 3:17 am

Mabe post a sample , so people can work out what it is - some thiings are easy to remove or fix ?
Anne

RuthieG
Posts: 22021
Joined: April 17th, 2008, 8:41 am
Location: Kent, England
Contact:

Post by RuthieG » June 20th, 2013, 3:23 am

Ths Samson Q1U isn't an analogue mic, actually. But I used one for some time, and it definitely has a hiss.

Was your test recording done on the Skype mic, or the Samson? I can see and hear electrical mains hum on it. If it wasn't the Samson, would you do another, please, so that I can take a look and see what needs to be done? It is highly likely that you will need some noise reduction - I have a Yeti, and it is a wonderful mic, but I still wouldn't get away without some noise cleaning, simply because my supposedly silent computer still makes a hum. However, my little noise-cleaning regime is second nature to me now, and takes very little time or effort.

Ruth
My LV catalogue page | RuthieG's CataBlog of recordings | Tweet: @RuthGolding

ccfpcl
Posts: 243
Joined: June 13th, 2013, 7:36 am

Post by ccfpcl » June 20th, 2013, 10:02 am

Hi Ruth/Anne

Here are 2 tests I've just done with the Q1U: raw, and with one pass NR with the default settings:

http://upload.librivox.org/share/uploads/tests/samson_4_raw.mp3
http://upload.librivox.org/share/uploads/tests/samson_4_nr.mp3

Thanks, Chris.

tovarisch
Posts: 2805
Joined: February 24th, 2013, 7:14 am
Location: New Hampshire, USA

Post by tovarisch » June 20th, 2013, 10:16 am

Hi Chris,

Ahead of Ruth's or Anne's reply I took the liberty of trying to clean up your raw recording. The result is here. Two passes with {12/0.00/150/0.00}. Also, make sure to "Get Noise Profile" before each pass (could it be you have forgotten that step?)

Sounds OK to me... 8-)
tovarisch
  • reality prompts me to scale down my reading, sorry to say
    to PLers: do correct my pronunciation please

TriciaG
LibriVox Admin Team
Posts: 44065
Joined: June 15th, 2008, 10:30 pm
Location: Toronto, ON (but Minnesotan to age 32)

Post by TriciaG » June 20th, 2013, 10:25 am

I've got a Q1R and use it as my main mic. I do one pass of NR at 12 dB reduction as default. I rarely have to do more than that.

I think your noise-cleaned sample is plenty clean. :)
Mystery stories: The Master of Mysteries
Kerner Report on 1967 race riots: LINK
Mussolini's speeches thru 1923: LINK
The Medici family history: LINK

RuthieG
Posts: 22021
Joined: April 17th, 2008, 8:41 am
Location: Kent, England
Contact:

Post by RuthieG » June 20th, 2013, 10:43 am

I think 12 dB noise reduction is OK - it leaves all but the very lowest noise frequencies at -80dB, and that sounds OK. Not sure what the default settings are for Noise Reduction these days, but if the Sensitivity setting is at 0 dB, I'd increase it to 4 dB.

Or... use settings of 8dB and 2dB for noise reduction and sensitivity respectively, and run it twice. I think that is what I would do if it were mine. It leaves your voice untouched, and sounds quite nice and warm.

Ask three people, and you will get three different answers, of course :roll:.

Ruth
My LV catalogue page | RuthieG's CataBlog of recordings | Tweet: @RuthGolding

ccfpcl
Posts: 243
Joined: June 13th, 2013, 7:36 am

Post by ccfpcl » June 20th, 2013, 10:47 am

Thanks all

Well sounds like the answer is that I should expect to have to do a NR pass, which is fair enough.

Will try the various suggestions and pick one

Cheers, Chris

Post Reply