Hello Pete,
a signal delayed by less than 5-8 milliseconds causes a hollowness. If
the delay is less than 2 milliseconds the human ear cannot detect an
echo.
The awareness of echo depends of course on (the combination of)
various effects, e.g. the frequency response and sidetone masking
rating (STMR) of the sidetone path.
You can find some information on effects related to sidetone in the G
series papers of the ITU-T.
Best regards
Volker
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Volker Sypli
Regulatory Authority for Telecommunications and Posts
Canisisusstr. 21
D 55122 Mainz
Tel.: +49 61 31 18 22 34
Fax.: +49 61 31 18 56 08
email: sy...@bapt.de
____________________________________________________________
Betreff: Sidetone Delay
Autor: <treg@world.std.com> bei Internet
Datum: 98-01-12 12:37
TREG'ers,
I am looking for information on the minimum sidetone delay that the
average human ear can detect. In other words, when I speak into my
handset mic, I hear sidetone in the receiver. If it is delayed by,
say 100 milliseconds, I hear a distinct echo. How short must the
delay be to eliminate the awareness of an echo?
Thanks in advance for your help.
Pete
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Peter Van Raalte | Email: pe...@vband.com
Compliance Engineer |
V-Band Corporation | Phone: 914-789-5117
565 Taxter Road |
Elmsford NY 10523 | FAX: 914-347-3432
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