US6803965B1
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Method of and apparatus for measuring horizontal frequency
Assignee: Sony Corp
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Filing: 2000-01-04
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Granted: 2004-10-12
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Expires: 2020-01-04
Abstract
Abstract A method of measuring horizontal frequency, which comprises the steps of resetting an 8-bit counter, which counts horizontal synchronous pulses separated from a video signal, at a time point corresponding to an edge of a vertical synchronous signal separated from the video signal, causing a data latch portion, which is operative to latch count data obtained from a 16-bit counter operative to count clock pulses having a predetermined frequency, to latch the count data obtained from the 16-bit counter at a time point corresponding to an edge of a bit output signal obtained from the seventh bit position of the 8-bit counter, detecting a period which corresponds to 128 times a horizontal period of the video signal based on a difference between counted values represented respectively by a couple of count data latched successively by the data latch portion, and measuring horizontal frequency of the video signal by calculating the horizontal frequency on the strength of the period corresponding to 128 times the horizontal period.
Inventors
- 👤 Hirotaka Takegoshi
- 👤 Nobuo Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:19
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N17/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
197 words
A method of measuring horizontal frequency, which comprises the steps of; resetting an N-bit counter (N is a positive integer), which is operative to count pulses constituting a horizontal synchronous signal separated from a video signal, at a time point corresponding to a front or rear edge of a vertical synchronous signal separated from the video signal, causing a data latch portion, which is operative to latch selectively count data obtained from an M-bit counter (M is a positive integer) operative to count clock pulses having a predetermined frequency, to latch the count data obtained from the M-bit counter at a time point corresponding to a front or rear edge of a bit output signal obtained from a predetermined bit position of the N-bit counter, detecting a period which corresponds to X times (X is a positive integer) a horizontal period of the video signal based on a difference between counted values represented respectively by a couple of count data latched successively by the data latch portion, and measuring horizontal frequency of the video signal by calculating the horizontal frequency on the strength of the period corresponding to X times the horizontal period of the video signal.
Claim 2
Independent Claim
197 words
A method of measuring horizontal frequency, which comprises the steps of; resetting an N-bit counter (N is a positive integer), which is operative to count pulses constituting a horizontal synchronous signal separated from a video signal, at a time point corresponding to a front or rear edge of a vertical synchronous signal separated from the video signal, causing a data latch portion, which is operative to latch selectively count data obtained from an M-bit counter (M is a positive integer) operative to count clock pulses having a predetermined frequency, to latch the count data obtained from the M-bit counter at a time point corresponding to a front or rear edge of a bit output signal obtained from a predetermined bit position of the N-bit counter, detecting a period which corresponds to X times (X is a positive integer) a horizontal period of the video signal based on a difference between counted values represented respectively by a couple of count data latched successively by the data latch portion, and measuring horizontal frequency of the video signal by calculating the horizontal frequency on the strength of the period corresponding to X times the horizontal period of the video signal.
Claim 3
Dependent Claim
32 words
A method according to claim 1 , wherein the horizontal frequency is calculated by obtaining an inverse of 1/X the value representing the detected period corresponding to X times the horizontal period.
Claim 4
Dependent Claim
68 words
A method according to claim 1 , wherein the N-bit counter is an 8-bit counter, the data latch portion is caused to latch the count data obtained from the M-bit counter at a time point corresponding to a front edge of a bit output signal obtained from the seventh bit position of the 8-bit counter, and a period which corresponds to 128 times the horizontal period is detected.
Claim 5
Dependent Claim
95 words
A method according to claim 2 , wherein the N-bit counter is an 8-bit counter, the data latch portion is caused to latch the count data obtained from the M-bit counter at a time point corresponding to a front or rear edge of a bit output signal obtained from the seventh bit position of the 8-bit counter, a period which corresponds to 128 times the horizontal period is detected, and the horizontal frequency is calculated by obtaining an inverse of {fraction (1/128)} the value representing the detected period corresponding to 128 times the horizontal period.
Claim 6
Independent Claim
192 words
An apparatus for measuring horizontal frequency, which comprises an N-bit counter (N is a positive integer) operative to count pulses constituting a horizontal synchronous signal separated from a video signal and subjected to resetting at a time point corresponding to a front or rear edge of a vertical synchronous signal separated from the video signal, an M-bit counter (M is a positive integer) operative to count clock pulses having a predetermined frequency, a data latch portion operative to latch selectively count data obtained from the M-bit counter at a time point corresponding to a front or rear edge of a bit output signal obtained from a predetermined bit position of the N-bit counter, and an operation control portion for detecting a period which corresponds to X times (X is a positive integer) a horizontal period of the video signal based on a difference between counted values represented respectively by a couple of count data latched successively by the data latch portion and measuring the horizontal frequency of the video signal by calculating the horizontal frequency on the strength of the period corresponding to X times the horizontal period of the video signal.
Claim 7
Independent Claim
192 words
An apparatus for measuring horizontal frequency, which comprises an N-bit counter (N is a positive integer) operative to count pulses constituting a horizontal synchronous signal separated from a video signal and subjected to resetting at a time point corresponding to a front or rear edge of a vertical synchronous signal separated from the video signal, an M-bit counter (M is a positive integer) operative to count clock pulses having a predetermined frequency, a data latch portion operative to latch selectively count data obtained from the M-bit counter at a time point corresponding to a front or rear edge of a bit output signal obtained from a predetermined bit position of the N-bit counter, and an operation control portion for detecting a period which corresponds to X times (X is a positive integer) a horizontal period of the video signal based on a difference between counted values represented respectively by a couple of count data latched successively by the data latch portion and measuring the horizontal frequency of the video signal by calculating the horizontal frequency on the strength of the period corresponding to X times the horizontal period of the video signal.
Claim 8
Dependent Claim
38 words
An apparatus according to claim 5 , wherein said operation control portion is operative to calculate the horizontal frequency by obtaining an inverse of 1/X the value representing the detected period corresponding to X times the horizontal period.
Claim 9
Dependent Claim
43 words
An apparatus according to claim 5 , wherein said N-bit counter is supplied with the vertical synchronous signal separated from the video signal and subjected to resetting at the time point corresponding to the front or rear edge of the vertical synchronous signal.
Claim 10
Dependent Claim
47 words
An apparatus according to claim 5 , wherein said operation control portion is supplied with the vertical synchronous signal separated from the video signal and operative to reset said N-bit counter at the time point corresponding to the front or rear edge of the vertical synchronous signal.
Claim 11
Dependent Claim
57 words
An apparatus according to claim 5 , wherein said data latch portion is supplied with the bit output signal obtained from the predetermined bit position of the N-bit counter and operative to latch the count data obtained from the M-bit counter at the time point corresponding to the front or rear edge of the bit output signal.
Claim 12
Dependent Claim
43 words
An apparatus according to claim 5 , wherein said M-bit counter is supplied with the vertical synchronous signal separated from the video signal and subjected to resetting at the time point corresponding to the front or rear edge of the vertical synchronous signal.
Claim 13
Dependent Claim
37 words
An apparatus according to claim 5 , wherein said operation control portion is provided with a memory device in which the count data obtained from said M-bit counter and latched by said data latch portion are stored.
Claim 14
Dependent Claim
68 words
An apparatus according to claim 5 , wherein said N-bit counter is an 8-bit counter, said data latch portion is caused to latch the count data obtained from the M-bit counter at a time point corresponding to a front edge of a bit output signal obtained from the seventh bit position of the 8-bit counter, and a period which corresponds to 128 times the horizontal period is detected.
Claim 15
Dependent Claim
95 words
A method according to claim 6 , wherein said N-bit counter is an 8-bit counter, said data latch portion is caused to latch the count data obtained from the M-bit counter at a time point corresponding to a front or rear edge of a bit output signal obtained from the seventh bit position of the 8-bit counter, a period which corresponds to 128 times the horizontal period is detected, and the horizontal frequency is calculated by obtaining an inverse of {fraction (1/128)} the value representing the detected period corresponding to 128 times the horizontal period.
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) | 2007-10-12 | 2008-04-12 | 2008-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-10-12 | 2012-04-12 | 2012-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-10-12 | 2016-04-12 | 2016-10-12 | $7700.00 | Window Closed / Lapsed |