|
Previous Entry
Journal Index
|
x
|
x
|
n
|
- Twenty poets read today
- Well, one of them read by proxy so that makes 19
- On the subject of thresholds
- The reclusive one never crosses the threshold of her
barn door
where she lives an agrarian life
and the apple blossoms are still in danger of frost
- Poets bound together only by geography
- Cross and recross door sills all afternoon
between living and dying and being born
surrounded by the names of the Civil War dead
the date and manner of each death
opposite the abolitionist posters
and a tattered American flag
- Properly the door sill
- But figuratively the beginning of anything
electric action potential
audio signal
brightness perceptible to the human eye
the minimum effective sound pressure level of the signal
that is capable of evoking an auditory sensation
- The threshold is usually given as a sound pressure
level in decibels
- the minimum effective sound pressure level of that
signal
will stimulate the ear to a point at which the sensation
of feeling becomes uncomfortable
a point at which there is a sensation of feeling that is
different from the sensation of hearing
discomfort gives way to definite pain that is distinct
from mere non-noxious feeling of discomfort
the lowest level of the input signal which produces desired response
at the output
- The term applies similarly for other senses.
- brightness
the human eye
pain
storehouses
a spike of excitatory action potential
- The beginning of that portion of the runway usable
for landing.
- Coming in for a landing in Pacific Grove
a million monarch butterflies
from pupae to souls of the dead in an eye blink
before they get to Mexico
crossing the border, the gate, the entrance
to the temple.
- They're activating neurons all over the place
- And no limiting takes place
yet.
- The term applies equally to psychophysics,
- Which has little to do with gathering into barns
or crossing the Shirakawa barrier on the narrow road
north
spilling over the edges that mark the interior from the
exterior
and makes public the private.
- Also called tickle.
-
-
Threshold
- Thresh"old (?), n. [OE. threswold, þreshwold,
AS. þrescwald, þerscwald, þerscold,
þrescold, fr. þrescan, þerscan, to
thresh; akin to Icel. þreskjöde,
þröskuldr, Sw. tröskel, Dan.
tærskel. See Thrash.]
- 1. The plank, stone, or piece of timber, which lies
under a door, especially of a dwelling house, church,
temple, or the like; the door sill; hence, entrance;
gate; door.
- 2. Fig.: The place or point of entering or beginning,
entrance; outset; as, the threshold of life. --Webster's
Revised Unabridged Dictionary, 1913 Edition
- Threshold
- The plate at the floor level of a door located
between the casing edges that mark the interior from the
exterior of the door. - Dictionary of Construction Terms
- Threshold
- Properly the door-sill, but figuratively applied to
the beginning of anything; as, the threshold of life
(infancy), the threshold of an argument (the
commencement), the threshold of the inquiry (the first
part of the investigation). (Saxon, thoerscwald,
door-wood; German, thürschwelle; Icelandic,
throsulldur. From thür comes our door. ) -
DICTIONARY OF PHRASE AND FABLE BY E. COBHAM BREWER (31KB,
indexed Oct
- Threshold
- (DOD, NATO) The beginning of that portion of the
runway usable for landing. - .DOD Dictionary of Military
Terms (indexed Jan 11 1998)
- Threshold
- In a compressor or limiter, the input level above
which compression or limiting takes place. Therefore the
level of the audio must be above the threshold setting,
or no effect is heard. In an expander or gate, the input
level below which expansion or gating occurs. - Guitar
Nine Glossary of Terms
- Threshold
- (1.) Heb. miphtan, probably a projecting beam at a
higher point than the threshold proper (1 Sam. 5:4,5;
Ezek. 9:3; 10:4,18; 46:2; 47:1); also rendered "door" and
"door-post."
- (2.) 'Asuppim, pl. (Neh. 12:25), rendered correctly
"storehouses" in the Revised Version. In 1 Chr 26:15, 17
the Authorized Version retains the word as a proper name,
while in the Revised Version it is translated
"storehouses." -- Easton Bible Dictionary (indexed Dec 4
1997)
- threshold
- Definition: The level of electric action potential
that must be reached to cause a neuron or node in an
artificial system to fire or become activated as the
result of a spike of excitatory action potential
(depolarization). Threshold functions can be either
square or sigmoidal. -- CyberLore Jargon (of the brain)
(indexed Jan 9 1998)
- threshold
- Generally, the minimum value of a signal that can be
detected by the system or sensor under consideration.
- threshold contrast
- The smallest contrast of luminance (or brightness)
that is perceptible to the human eye under specified
conditions of adaptation luminance and target visual
angle. Also called contrast threshold, liminal contrast.
Compare threshold illuminance. Psychophysically, the
existence of a threshold contrast is merely a special
case of the general rule that for every sensory process
there is a corresponding lowest detectable intensity of
stimulus, i.e., a limen.
- threshold illuminance
- The lowest value of illuminance which the eye is
capable of detecting under specified conditions of
background luminance and degree of dark adaptation of the
eye. Also called flux-density threshold. Compare
threshold contrast. See Allard law. This threshold, which
controls the visibility of point light sources,
especially at night, cannot be assigned any universal
value, but nonflashing lights can generally be seen by a
fully dark-adapted eye when the lights yield an
illuminance of the order of 0.1 lumen per square
kilometer at the eye.
- threshold of audibility
- For a specified signal, the minimum effective sound
pressure level of the signal that is capable of evoking
an auditory sensation in a specified fraction of the
trials. The characteristics of the signal, the manner in
which it is presented to the listener, and the point at
which the sound pressure level is measured must be
specified. Also called threshold of detectability. Unless
otherwise indicated, the ambient noise reaching the ears
is assumed to be negligible. The threshold is usually
given as a sound pressure level in decibels, relative to
0.0002 microbar Instead of the method of constant
stimuli, which is implied by the phrase a specified
fraction of the trials , another psychophysical method
(which should be specified) may be employed.
- threshold of detectability = threshold of audibility.
- threshold of discomfort
- In acoustics, for a specified signal, the minimum
effective sound pressure level of that signal which, in a
specified fraction of the trials, will stimulate the ear
to a point at which the sensation of feeling becomes
uncomfortable. The term applies similarly for other
senses.
- threshold of feeling
- In acoustics, for a specified signal, the minimum
sound pressure level at the entrance to the external
auditory canal which, in a specified fraction of the
trials, will stimulate the ear to a point at which there
is a sensation of feeling that is different from the
sensation of hearing. Also called tickle.
- threshold of pain
- In acoustics, for a specified signal, the minimum
effective sound pressure level of that signal which, in a
specified fraction of the trials, will stimulate the ear
to a point at which the discomfort gives way to definite
pain that is distinct from mere non-noxious feeling of
discomfort. The term applies similarly for other senses.
- threshold sensitivity
- Of a transducer, the lowest level of the input signal
which produces desired response at the output. The term
applies equally to psychophysics. -- DICTIONARY OF
TECHNICAL TERMS FOR AEROSPACE USE (203KB, indexed Jan 11
|
