US4696306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrocardiogram playback system and method
Assignee: Akai Electric Co Ltd
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Filing: 1986-11-20
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Granted: 1987-09-29
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Expires: 2006-11-20
Abstract
Abstract A system and method for minimizing time-base fluctuations in playing back an electrocardiogram recorded on one track of a multi-track magnetic tape with reference clock signals recorded on another track. A sampling circuit samples the recorded electrocardiogram in response to sampling pulses produced in response to the recorded reference clock signals, and the sampled electrocardiogram is stored in a memory. The stored signal is then read in response to timing pulses produced by a generator. The phase difference between the sampling and timing pulses is detected and maintained constant.
Inventors
- 👤 Yoshihiko Shiozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:59
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/333; A61B5/336
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
127 words
An electrocardiogram playback system comprising: a plurality of track heads for simultaneously reading an electrocardiogram recorded on one track of a multi-track magnetic tape and reference clock signals recorded on another track of said tape; means for driving said tape past said heads; a sampling pulse generator connected to said heads for producing sampling pulses in response to the recorded reference clock signals; sampling means for sampling the recorded electrocardiogram in response to said sampling pulses; memory means for storing the sampled electrocardiogram; reading pulse generator means for producing a timing pulse for reading said sampled electrocardiogram from said memory means; a phase detector means for detecting the phase between said sampling pulses and said timing pulses; and control circuit means for maintaining said phase difference constant.
Claim 2
Dependent Claim
127 words
An electrocardiogram playback system comprising: a plurality of track heads for simultaneously reading an electrocardiogram recorded on one track of a multi-track magnetic tape and reference clock signals recorded on another track of said tape; means for driving said tape past said heads; a sampling pulse generator connected to said heads for producing sampling pulses in response to the recorded reference clock signals; sampling means for sampling the recorded electrocardiogram in response to said sampling pulses; memory means for storing the sampled electrocardiogram; reading pulse generator means for producing a timing pulse for reading said sampled electrocardiogram from said memory means; a phase detector means for detecting the phase between said sampling pulses and said timing pulses; and control circuit means for maintaining said phase difference constant.
Claim 3
Dependent Claim
21 words
A system as in claim 1 wherein said control circuit means controls said driving means to maintain said phase difference constant.
Claim 4
Dependent Claim
30 words
A system as in claim 1 wherein the output of said phase detector means is connected to said reading pulse generator means to control the period of said timing pulses.
Claim 5
Dependent Claim
19 words
A system as in claim 1 further including a playback amplifier connected between said heads and said sampling means.
Claim 6
Independent Claim
104 words
A method of playing back an electrocardiogram recorded on one track of a multi-track magnetic tape and reference clock signals recorded on another track of said tape, comprising the steps of: driving said tape past a plurality of track heads; producing sampling pulses in response to detection by one head of the recorded reference clock signals; sampling the recorded electrocardiogram detected by another head in response to said sampling pulses; storing the sampled electrocardiogram; producing timing pulses for reading said sampled electrocardiogram from said memory means; detecting the phase difference between said sampling pulses and said timing pulses; and maintaining said phase difference constant.
Claim 7
Independent Claim
104 words
A method of playing back an electrocardiogram recorded on one track of a multi-track magnetic tape and reference clock signals recorded on another track of said tape, comprising the steps of: driving said tape past a plurality of track heads; producing sampling pulses in response to detection by one head of the recorded reference clock signals; sampling the recorded electrocardiogram detected by another head in response to said sampling pulses; storing the sampled electrocardiogram; producing timing pulses for reading said sampled electrocardiogram from said memory means; detecting the phase difference between said sampling pulses and said timing pulses; and maintaining said phase difference constant.
Claim 8
Independent Claim
106 words
A method of recording and playing back an electrocardiogram comprising the steps of: recording said electrocardiogram on one track of a multi-track magnetic tape and recording a reference clock signal on another track of said tape; driving said tape past a plurality of track heads; producing sampling pulses in response to the detection by one of said heads of recorded reference clock signals; sampling the recorded electrocardiogram in response to said sampling pulses; storing the sampled electrocardiogram; producing timing pulses for reading said sampled electrocardiogram from said memory means; detecting the phase between said sampling pulses and said timing pulses; and maintaining said phase difference constant.
Claim 9
Independent Claim
106 words
A method of recording and playing back an electrocardiogram comprising the steps of: recording said electrocardiogram on one track of a multi-track magnetic tape and recording a reference clock signal on another track of said tape; driving said tape past a plurality of track heads; producing sampling pulses in response to the detection by one of said heads of recorded reference clock signals; sampling the recorded electrocardiogram in response to said sampling pulses; storing the sampled electrocardiogram; producing timing pulses for reading said sampled electrocardiogram from said memory means; detecting the phase between said sampling pulses and said timing pulses; and maintaining said phase difference constant.
Claim 10
Dependent Claim
17 words
A method as in claim 6 wherein said reference clock signal is a digital self-clocking digital signal.
Claim 11
Dependent Claim
146 words
An electrocardiogram recording/playback system comprising: means for recording an electrocardiogram on one track of a multi-track magnetic tape and reference clock signals on another track of said tape; means for driving said tape past said heads; a plurality of track heads or simultaneously reading an electrocardiogram on said one track of said multi-track magnetic tape and reference clock signals on said another track of said tape; a sampling pulse generator connected to said heads for producing sampling pulses in response to said recorded reference clocks; sampling means for sampling the recorded electrocardiogram in response to said sampling pulses; memory means for storing the sampled electrocardiogram; reading pulse gnerator means for producing timing pulse for reading said sampled electrocardiogram from said memory means; phase detector means for detecting the phase between said sampling pulses and said timing pulses; and control circuit for maintaining said phase difference constant.
Claim 12
Dependent Claim
146 words
An electrocardiogram recording/playback system comprising: means for recording an electrocardiogram on one track of a multi-track magnetic tape and reference clock signals on another track of said tape; means for driving said tape past said heads; a plurality of track heads or simultaneously reading an electrocardiogram on said one track of said multi-track magnetic tape and reference clock signals on said another track of said tape; a sampling pulse generator connected to said heads for producing sampling pulses in response to said recorded reference clocks; sampling means for sampling the recorded electrocardiogram in response to said sampling pulses; memory means for storing the sampled electrocardiogram; reading pulse gnerator means for producing timing pulse for reading said sampled electrocardiogram from said memory means; phase detector means for detecting the phase between said sampling pulses and said timing pulses; and control circuit for maintaining said phase difference constant.
Claim 13
Dependent Claim
21 words
A system as in claim 8 wherein said control circuit means controls said driving means to maintain said phase difference constant.
Claim 14
Dependent Claim
30 words
A system as in claim 8 wherein the output of said phase detector means is connected to said reading pulse generator means to control the period of said timing pulses.
Claim 15
Dependent Claim
19 words
A system as in claim 8 further including a playback amplifier connected between said heads and said sampling means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-28 | 1999-03-30 | 1999-09-29 | $7700.00 | Window Closed / Lapsed |