IHF Noise Measurement Weighting

[Tak]

I hope any guru here would help me on this.

I want to have the filter parameter for IHF noise measurement
weighting. They are so called A, B, and C weighting.

I vaguely remember parameters, say A filter's low-cut is
somewhere 800Hz by 6dB/oct, and high-cut is around 5kHz by
12dB/oct.
B is wider, and C is further wider.
The parameters I want are:

Weight Low Slope - High Slope
A xxxHz xxxdB/oct - xxxHz xxxdB/oct
B xxxHz xxxdB/oct - xxxHz xxxdB/oct
C xxxHz xxxdB/oct - xxxHz xxxdB/oct

Thanks in advance
Tak

 

[Dale H. Cook]

On Sat, 04 Jun 2005 20:01:51 +0900, Tak <takfuji@hotmail.com> wrote:

I want to have the filter parameter for IHF noise measurement
weighting. They are so called A, B, and C weighting.

Those parameters are determined by published graphs. You can either
purchase a copy of IEC 60651, or see a standard reference such as The
Audio Cyclopedia.

Dale H. Cook, Chief Engineer, Centennial Broadcasting,
Roanoke/Lynchburg, VA - WZZI / WZZU / WLNI
http://members.cox.net/dalehcook/starcity.shtml

 

[Tak]

Dale H. Cook wrote:

Those parameters are determined by published graphs. You can either
purchase a copy of IEC 60651, or see a standard reference such as The
Audio Cyclopedia.

Thanks, Dale.
Appreciate the information.
I have ordered G. Ballou's "Handbook for Sound Engineers" at
Amazon. It's 2005 edition. I hope this carries the graph.
I found the "Audio Cyclopedia" seems a bit old.

Looked at IEC standards for 60651 as I knew the number before
posting this newsgroup, but could not find it.

Tak