AES Standards News Blog

March 2013

New project - Frequency and impulse response of sound systems in auditoria

AES-X219 Method of measurement for frequency and impulse response of sound systems in auditoria has been initiated and assigned to AESSC Working Group SC-04-08.

The project is scoped to specify a method of measurement for frequency and impulse response of sound systems in auditoria. The output intent is a standard. 

The audience experience of sound reproduced through loudspeakers in an auditorium can vary greatly. In many applications where sound is reproduced in auditoria, a predictable performance is valued. While a number of different electro-acoustic and acoustic parameters contribute to this experience, a standard method of measuring the frequency & impulse response of the sound as presented to the audience by the loudspeaker system(s) will be a necessary part of any more general solution.

http://www.aes.org/standards/meetings/init-projects/aes-x219-init.cfm

http://www.aes.org/standards/development/membership.cfm


Posted: Monday, March 18, 2013

| Permalink

New project - Measurement and calibration of sound systems in rooms

 

AES-X218 Measurement and calibration of sound systems in rooms has been initiated and assigned to AESSC Working Group SC-04-08

This project seeks to document relevant parameters affecting the audience experience of a sound system in a generalized room, and identify appropriate objective methods of measurements to quantify them. The intent is to identify tools and procedures for a technician to measure the performance of a loudspeaker system in a room, and then support accurate and reliable calibration of this system to a specified performance. The output intent is an Information Document.
 
Measurement of sound systems in rooms, including but not limited to cinema B-chains, currently relies on empirical measurement techniques developed in the 1970s. Modern methods and equipment should offer simpler and more accurate ways to calibrate rooms with greater precision. This project will review the parameters that affect the audience experience in these rooms, and the objective methods of measurement necessary to quantify them. This will provide a basis for more detailed standardization for measurements and calibration protocols for controllable parameters.
 
http://www.aes.org/standards/meetings/init-projects/aes-x218-init.cfm
 
http://www.aes.org/standards/development/membership.cfm

 


Posted: Monday, March 18, 2013

| Permalink

New project - Calibration pink-noise

New project AES-X216 Calibration Pink-Noise Standard Initiated and assigned to AESSC Working Group SC-04-08

This project will liaise with SMPTE TC-25CSS in their project to "Create a pink-noise Standard, and a reference pink-noise file available in a digital audio file and DCP formats that conform to the description of the pink noise in ST 202:2010 and RP 200-2012 and for which the time domain (mean, standard deviation, skew, kurtosis, etc) and frequency domain (energy per bandwidth, bandwidth, etc) characteristics are defined. Specify the algorithm used to generate the pink-noise file." The project will consider comments as appropriate for communication to SMPTE.

Pink noise generators on the market have measurable differences that can create calibration differences between cinemas. The creation of a stand-alone pink-noise Standard and reference file (with known statistics and characteristics) will eliminate an important variable in the calibration process.

http://www.aes.org/standards/meetings/init-projects/aes-x216-init.cfm

http://www.aes.org/standards/development/membership.cfm


Posted: Monday, March 18, 2013

| Permalink

New project - Current procedures to calibrate the cinema B-Chain

New project AES-X215 Current procedures to calibrate the cinema B-Chain has been initiated and assigned to AESSC Working Group SC-04-08.

This project will liaise with SMPTE TC-25CSS in their project to Codify current procedures as used by skilled theater technicians to calibrate the Cinema B-Chain. The project will consider comments as appropriate for communication to SMPTE.

Current standards for B-chain calibration include ST202 and ISO 2969 which have been used since the mid 1970s, however the effectiveness of this calibration still varies widely. Measurement equipment and technology has evolved since these standards were made. No standardized procedure exists for using modern technology (such as dual DFT-based transfer-function technology) to calibrate cinema theater B-chain systems.

http://www.aes.org/standards/meetings/init-projects/aes-x215-init.cfm

http://www.aes.org/standards/development/membership.cfm


Posted: Monday, March 18, 2013

| Permalink

RSS News Feed
 
Facebook   Twitter   LinkedIn   Google+   YouTube   RSS News Feeds  
AES - Audio Engineering Society