US4749986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collecting process of fire data and fire detector using the process and fire alarm system also using the process
Assignee: Hochiki Corp
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Filing: 1986-04-07
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Granted: 1988-06-07
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Expires: 2006-04-07
Abstract
Abstract A process for detecting a change in the physical phenomena caused by a fire in an analog form, periodically sampling the analog detection data, calculating moving average values of the time series sampling data for filtering, and establishing the sampling period and the number of smoothing data provided for the moving average calculation so that a cut-off frequency of the filtering is established which is coincident with the maximum frequency of the main frequency components of the analog detection data. The invention also relates to a fire detector and a fire alarm system for carrying out such a process.
Inventors
- 👤 Shigeru Otani
- 👤 Hiromitsu Ishii
- 👤 Takashi Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:40
CPC Classifications
G; G08; G08B; G08B17/00; G08B26/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
82 words
A process of collecting fire data which comprises: detecting a change in physical phenomena caused by a fire in an analog form, sampling the analog detection data, calculating moving average values of the time series sampling data for filtering, establishing a sampling period and a number of smoothing data provided for the moving average calculation so that a cut-off frequency of the filtering is established which is coincident with the maximum frequency of the main frequency components of the analog detection data.
Claim 2
Dependent Claim
82 words
A process of collecting fire data which comprises: detecting a change in physical phenomena caused by a fire in an analog form, sampling the analog detection data, calculating moving average values of the time series sampling data for filtering, establishing a sampling period and a number of smoothing data provided for the moving average calculation so that a cut-off frequency of the filtering is established which is coincident with the maximum frequency of the main frequency components of the analog detection data.
Claim 3
Dependent Claim
24 words
A collecting process as claimed in claim 1 in which the physical phenomena is temperature and the maximum frequency is established at 60 mHz.
Claim 4
Dependent Claim
25 words
A collecting process as claimed in claim 1 in which the physical phenomena is smoke density and the maximum frequency is established at 20 mHz.
Claim 5
Dependent Claim
60 words
A collecting process as claimed in claim 1 in which the maximum frequency is established according to the relation (1) f.sub.m -f.sub.n ≦f.sub.n -f.sub.c (2) f.sub.m >f.sub.c where f m is the maximum frequency of the detection data, f n is the Nyquist frequency and f c is the cut-off frequency of the filter with respect to the detection data.
Claim 6
Dependent Claim
113 words
A fire detector which comprises: a detecting section for detecting, in an analog form, a change in physical phenomena caused by a fire and outputting the analog detection data; a filter including a sampling section for sampling the analog detection data and a calculating section for calculating moving average values of the time series sampled data output from the sampled section; and a control section for controlling the sampling period of the sampling section and the number of smoothing data provided for the moving average calculation so that a cut-off frequency of the filter is established which is coincident with the maximum frequency of the main frequency components of the analog detection data.
Claim 7
Dependent Claim
113 words
A fire detector which comprises: a detecting section for detecting, in an analog form, a change in physical phenomena caused by a fire and outputting the analog detection data; a filter including a sampling section for sampling the analog detection data and a calculating section for calculating moving average values of the time series sampled data output from the sampled section; and a control section for controlling the sampling period of the sampling section and the number of smoothing data provided for the moving average calculation so that a cut-off frequency of the filter is established which is coincident with the maximum frequency of the main frequency components of the analog detection data.
Claim 8
Dependent Claim
24 words
A fire detector as claimed in claim 5 in which the physical phenomena is temperature and the maximum frequency is established at 60 mHz.
Claim 9
Dependent Claim
25 words
A fire detector as claimed in claim 5 in which the physical phenomena is smoke density and the maximum frequency is established at 20 mHz.
Claim 10
Dependent Claim
60 words
A fire detector as claimed in claim 5 in which the maximum frequency is established according to the relation (1) f.sub.m -f.sub.n ≦f.sub.n -f.sub.c (2) f.sub.m >f.sub.c wherein f m is the maximum frequency of the detection data, f n is the Nyquist frequency and f c is the cut-off frequency of the filter with respect to the detection data.
Claim 11
Dependent Claim
26 words
A fire detector as claimed in claim 5 in which in the control section the sampling period and the number of smoothing data are variably established.
Claim 12
Dependent Claim
128 words
A fire alarm system which comprises: at least one detecting section for detecting, in an analog form, a change in physical phenomena caused by a fire and outputting the analog detection data; a signal station having a filter which includes a sampling section for receiving and sampling the analog detection data and a calculating section for calculating moving average values of the time series sampled data output of the sampling section; and the signal station further having a control section for controlling the sampling period of the sampling section and the number of smoothing data provided for the moving average calculation so that a cut-off frequency of the filter is established which is coincident with the maximum frequency of the main frequency components of the analog detection data.
Claim 13
Dependent Claim
128 words
A fire alarm system which comprises: at least one detecting section for detecting, in an analog form, a change in physical phenomena caused by a fire and outputting the analog detection data; a signal station having a filter which includes a sampling section for receiving and sampling the analog detection data and a calculating section for calculating moving average values of the time series sampled data output of the sampling section; and the signal station further having a control section for controlling the sampling period of the sampling section and the number of smoothing data provided for the moving average calculation so that a cut-off frequency of the filter is established which is coincident with the maximum frequency of the main frequency components of the analog detection data.
Claim 14
Dependent Claim
25 words
A fire alarm system as claimed in claim 10 in which the physical phenomena is temperature and the maximum frequency is established at 60 mHz.
Claim 15
Dependent Claim
26 words
A fire alarm system as claimed in claim 10 in which the physical phenomena is smoke density and the maximum frequency is established at 20 mHz.
Claim 16
Dependent Claim
61 words
A fire alarm system as claimed in claim 10 in which the maximum frequency is established according to the relation (1) f.sub.m -f.sub.n ≦f.sub.n -f.sub.c (2) f.sub.m >f.sub.c wherein f m is the maximum frequency of the detection data, f n is the Nyquist frequency and f c is the cut-off frequency of the filter with respect to the detection data.
Claim 17
Dependent Claim
25 words
A fire detector as claimed in claim 10 wherein in the control section the sampling period and the number of smoothing data are variably established.
References Cited (Backward Citations)
US4644331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |