Re: perception of rise/fall times (Jont Allen )

Subject: Re: perception of rise/fall times
From:    Jont Allen  <jba(at)RESEARCH.ATT.COM>
Date:    Fri, 4 May 2001 13:51:39 -0400

Dennis and the Auditory list,

It is my view that the intensity JND is greatly effected by how the signal is
turned on. We propose that the intensity JND is 'bound' to the loudness
of a sound in a very specific way. It is well known for many years that
the intensity JND is very sensitive to the modulation format of the measurement.
I believe that this follows if the rise time plays a key role, as your question
suggests.

Thus I think the intensity JND is in the data category of what you are asking about.

Our view is documented in:

author={Allen, J. B. and Neely, S. T.}
title={Modeling the relation between the intensity {JND} and loudness
        for pure tones and wide--band noise}
journal=JASA
year=1997
month=dec
volume=102
number=6
pages={3628--3646}

Jont Allen



"Dennis P. Phillips, Ph.D." wrote:

> Hi Everyone:
>
> Are there published data on the similarities and/or differences between the
> percepts aroused by rise times and fall times (of tonal or other signals)?
> I'm not so much interested in increment and decrement thresholds per se, as
> I am in discrimination of the shape (e.g., linear, cosine) and slopes of
> the stimulus envelope.  We have the article by van Heuven & van den Broecke
> (JASA, 1979, 66: 1308-1315).  We also have the paper by Cutting & Rosner
> (P&P, 1974, 16: 564-570).  We're currently searching the literature for
> people who've cited those articles.  I would have thought that forward
> masking effects would have introduced asymmetries in the perception of rise
> and fall envelopes.  Is this not true?
>
> Parenthetically, we are aware of much of the literature on the neural
> coding of stimulus transients.
>
> Thanks very much for any help or guidance you can offer.  Best wishes from
> beautiful and sunny Nova Scotia.  Cheers,
>
> Dennis Phillips
>
> -----------------------------------
> Dennis P. Phillips, Ph.D.
> Hearing Research Laboratory
> Professor,
> Department of Psychology
> Dalhousie University
> Halifax, NS, Canada  B3H 4J1
> Phone: (902)494-2383
> Fax:   (902)494-6585
> E-mail: ears(at)is.dal.ca
> -----------------------------------

--
Jont B. Allen
AT&T Labs-Research, Shannon Laboratory, E161
180 Park Ave., Florham Park NJ, 07932-0971
973/360-8545voice, x7111fax, http://www.research.att.com/~jba