Telecommunications Industry Association tr41 3-09-11-012-m document Cover Sheet



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Telecommunications Industry Association TR41.3.3-09-11-012-M


Document Cover Sheet

Project Number

PN-3-4705.110-RV1

Document Title

Comments to PN-3-4705.110-RV1-Handset-Draft09

Source

Consultant in Electroacoustics

Contact

Name:

John Bareham

Phone:

734-665-4224

Complete Address:

309 Riverview Drive Ann Arbor, Michigan 48104

Fax:




Email:

jbareham@mich.com

Distribution

TR-41.3.3

Intended Purpose of Document
(Select one)

X

For Incorporation Into TIA Publication

X

For Information




Other (describe) -

The document to which this cover statement is attached is submitted to a Formulating Group or sub-element thereof of the Telecommunications Industry Association (TIA) in accordance with the provisions of Sections 6.4.1–6.4.6 inclusive of the TIA Engineering Manual dated March 2005, all of which provisions are hereby incorporated by reference.

Abstract

Various comments to PN-3-4705.110-RV1-Handset-Draft09.

  1. Loudness ratings. Change references in Annex A (and anywhere else in the document) from P.79 Annex G to P.79 Annex A.




  1. Annex A. Under the table, there is a reference to sealed STMR. Please check. I think its right, but needs some explanation or statement that the sealed weights are actually what is in the table.




  1. All references to P50 as test signal: Is the full length 10.5 second signal intended? Male and or female? OR, is it intended to use the 2 second version male that will ship with IEEE 269? This is what I recommend. There is unlikely to be any improvement by using the 10.5 second version relative to the 2 second version, and 2 sec is easier to handle. I think that is what TIA already agreed to, but I'm not sure. SoundCheck and B&K users are already using this 2-second version. In 269 it is called "P50-2."

In the 920 handset draft the current text is:


"Unless stated otherwise, the test stimulus signal shall be ITU-T P.50 artificial voice or an IEEE Std 269 published real speech test signal. In the event of different test results when using the P.50 and the IEEE Std 269 real speech signal, the results with the IEEE Std 269 real speech shall take precedence. The test signal used should be stated."
Here is my proposal:
"Unless stated otherwise, the test stimulus signal shall be the male speech test signal published with IEEE Std 269. P50-2 artificial voice, as published with IEEE Std 269, may be an acceptable alternate for many applications, depending on the nature of signal processing in the device under test. In the event of different test results when using the P50-2 and the IEEE Std 269 male speech signal, the results with the IEEE Std 269 male speech shall take precedence. The test signal used should be stated."

Note: Some of the above proposal is directly from 269:


"P50-2 artificial voice may be an acceptable alternate for many applications, depending on the nature of signal processing in the device under test. The user should demonstrate that results using this signal are equivalent to those that would be obtained using male speech.




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