K-5 background hiss with internal microphone: excessive?


Link Posted 29/05/2011 - 23:11
There seems to me to be a lot of background hiss when I use the internal microphone on my K-5.
This clip http://www.btinternet.com/~robheath/personal/IMK51048.AVI was recorded in a quiet room.
I would appreciated comments on whether the background hiss is excessive, and links to any similar clips for comparison.
Thanks Rob
Flickr feedback always appreciated: https://www.flickr.com/photos/robheath/

Pentax K-3/DA 18-135mm WR/DA 18-250mm/DA*50-135/Tamron 70-300/AF360FGZ/Manfrotto 055XPROB/a few other bits and pieces


Link Posted 29/05/2011 - 23:38
Expect crap when using built-in microphones. They only cost a couple of pennies. A good mic costs as much as a camera.

Read my article on capturing sound for video for options depending on your budget.
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Link Posted 30/05/2011 - 00:38
I watched/listened to the clip.

I would imagine the mic employs a compressor ( automatic Gain Control ) and thus in a quiet room with a quite voice which isn't that much louder than the residual noise level everything is being amplified including the noise.

To test this, repeat your clip but this time after the initial 1, 2 , 3 get closer to the mic and speak a lot louder. See if the noise is pushed down in volume in relation to the signal.

And as rparmar says good quality sound costs the same as good quality images.
[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283


Link Posted 30/05/2011 - 11:43
The sound codec used isn't recognised by Media Player Classic?
It plays on VLC, but I've always found that to have poor sound
quality anyway.

It does sound like the AGC has pushed up the background noise.

I've not tried Video on the K20D yet. Sound on miniDV recorders
isn't too bad.
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

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