Abstract
The instantaneous frequency display of single unit discharges provides a useful measure of neuronal activities. Such a device must produce voltage outputs proportional to the reciprocal of each inter-spike interval by on-line computation of the hyperbola of V = a/t. Segment approximation of the required hyperbola can be made by a series of exponential functions which increase in time constants by a factor of m. Numerical analysis of a normalized function indicates possible error maxima of 3.4, 2.4 and 1.1% for m of 2, 1.8 and 1.5, respectively. This prediction is fully confirmed by the actual performance where m of 1.5 is adopted. The test circuit combines only readily available ICs and other components, to give a linear F-V conversion over a dynamic range of 4-600 Hz with error maxima of approximately 1%. The outputs are square pulses of approximately 1.5 ms in duration through the use of a flexible sample-hold circuit. Compared with that of earlier models, this display mode gives better photographic records with the base-line in simultaneous multi-trace display. Simple and systematic methods are described for designing a circuit to one's own specifications, and also for compensating for component variations.
| Original language | English |
|---|---|
| Pages (from-to) | 89-98 |
| Number of pages | 10 |
| Journal | Journal of Neuroscience Methods |
| Volume | 7 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1983 |
| Externally published | Yes |
Fingerprint
Keywords
- instantaneous frequency
- nerve impulse
- reciprocal time-interval
- sample-hold
- segment approximation
ASJC Scopus subject areas
- Neuroscience(all)
Cite this
An improved instantaneous frequency meter for use with a multi-trace CRO : re-examination of the principles involved. / Obara, S.; Nagai, T.
In: Journal of Neuroscience Methods, Vol. 7, No. 1, 1983, p. 89-98.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - An improved instantaneous frequency meter for use with a multi-trace CRO
T2 - re-examination of the principles involved
AU - Obara, S.
AU - Nagai, T.
PY - 1983
Y1 - 1983
N2 - The instantaneous frequency display of single unit discharges provides a useful measure of neuronal activities. Such a device must produce voltage outputs proportional to the reciprocal of each inter-spike interval by on-line computation of the hyperbola of V = a/t. Segment approximation of the required hyperbola can be made by a series of exponential functions which increase in time constants by a factor of m. Numerical analysis of a normalized function indicates possible error maxima of 3.4, 2.4 and 1.1% for m of 2, 1.8 and 1.5, respectively. This prediction is fully confirmed by the actual performance where m of 1.5 is adopted. The test circuit combines only readily available ICs and other components, to give a linear F-V conversion over a dynamic range of 4-600 Hz with error maxima of approximately 1%. The outputs are square pulses of approximately 1.5 ms in duration through the use of a flexible sample-hold circuit. Compared with that of earlier models, this display mode gives better photographic records with the base-line in simultaneous multi-trace display. Simple and systematic methods are described for designing a circuit to one's own specifications, and also for compensating for component variations.
AB - The instantaneous frequency display of single unit discharges provides a useful measure of neuronal activities. Such a device must produce voltage outputs proportional to the reciprocal of each inter-spike interval by on-line computation of the hyperbola of V = a/t. Segment approximation of the required hyperbola can be made by a series of exponential functions which increase in time constants by a factor of m. Numerical analysis of a normalized function indicates possible error maxima of 3.4, 2.4 and 1.1% for m of 2, 1.8 and 1.5, respectively. This prediction is fully confirmed by the actual performance where m of 1.5 is adopted. The test circuit combines only readily available ICs and other components, to give a linear F-V conversion over a dynamic range of 4-600 Hz with error maxima of approximately 1%. The outputs are square pulses of approximately 1.5 ms in duration through the use of a flexible sample-hold circuit. Compared with that of earlier models, this display mode gives better photographic records with the base-line in simultaneous multi-trace display. Simple and systematic methods are described for designing a circuit to one's own specifications, and also for compensating for component variations.
KW - instantaneous frequency
KW - nerve impulse
KW - reciprocal time-interval
KW - sample-hold
KW - segment approximation
UR - http://www.scopus.com/inward/record.url?scp=0020695597&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0020695597&partnerID=8YFLogxK
U2 - 10.1016/0165-0270(83)90022-5
DO - 10.1016/0165-0270(83)90022-5
M3 - Article
C2 - 6834889
AN - SCOPUS:0020695597
VL - 7
SP - 89
EP - 98
JO - Journal of Neuroscience Methods
JF - Journal of Neuroscience Methods
SN - 0165-0270
IS - 1
ER -