US4989263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio receiver with automatic mode changeover circuit
Assignee: Sony Corp
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Filing: 1988-08-19
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Granted: 1991-01-29
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Expires: 2008-08-19
Abstract
Abstract A radio wave receiver has a signal generator for generating a binary code signal indicative of the level of electric field intensity of a received radio wave. The binary code signal is fed to an up/down counter for increasing its counted value by M (M is a positive integer) when the binary code signal indicates a "strong" electric field and decreasing its counted value by N (N is a positive integer) when the binary code signal indicates a "weak" electric field. The contents of the up/down counter are evaluated to determine whether a change-over to another mode of operation or broadcast station is effected or not in accordance with the count value of the counter.
Inventors
- 👤 Mitsuhiro Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:22
CPC Classifications
H; H03; H03J; H03J1/00; H03J1/0008; H03J1/0041; H03J1/0058; H03J1/0066
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
189 words
A receiver having an automatic mode change-over function, comprising: means for generating a binary code signal indicative of the level of electric field intensity of a received radio wave; sampling circuit means receiving said binary code signal for sampling same in response to a sampling pulse from a sampling pulse generating circuit; up/down counter means; means for detecting maximum and minimum count values in said up/down counter; means for increasing a counted value in said up/down counter means by M (M is a positive integer) when said binary code signal is at one level and decreasing a counted value in said up/down counter means by N (N is a positive integer) when said binary code signal is at the other level; gate circuit means responsive to said means for detecting for gating a signal from said means for increasing and decreasing to said up/down counter; means for detecting whether a change-over operation is to be effected in accordance with the count value of said up/down counter means; and means for setting said up/down counter at a midpoint between said maximum and minimum count values upon effecting a change-over operation.
Claim 2
Dependent Claim
189 words
A receiver having an automatic mode change-over function, comprising: means for generating a binary code signal indicative of the level of electric field intensity of a received radio wave; sampling circuit means receiving said binary code signal for sampling same in response to a sampling pulse from a sampling pulse generating circuit; up/down counter means; means for detecting maximum and minimum count values in said up/down counter; means for increasing a counted value in said up/down counter means by M (M is a positive integer) when said binary code signal is at one level and decreasing a counted value in said up/down counter means by N (N is a positive integer) when said binary code signal is at the other level; gate circuit means responsive to said means for detecting for gating a signal from said means for increasing and decreasing to said up/down counter; means for detecting whether a change-over operation is to be effected in accordance with the count value of said up/down counter means; and means for setting said up/down counter at a midpoint between said maximum and minimum count values upon effecting a change-over operation.
Claim 3
Dependent Claim
16 words
A receiver according to claim 1 further comprising means for determining a correctly received radio wave.
Claim 4
Dependent Claim
22 words
A receiver according to claim 1, wherein said sampling pulse generating circuit procedures said sampling pulses with a period of 17 milliseconds.
Claim 5
Dependent Claim
53 words
A receiver according to claim 1, wherein said means for determining includes first and second comparator means receiving the count value in said up/down counter for determining when said count value lies between respective upper and lower values, so that a correctly received radio wave is declared when said count value lies therebetween.
Claim 6
Dependent Claim
172 words
A receiver having an automatic mode change-over function for changing between two operation modes, comprising: means for generating a signal having one of two possible levels in response to the level of electric field intensity of a received radio wave; sampling means including a sampling circuit for sampling said signal from said means for generating in response to sampling pulses from a sampling pulse generating circuit; up/down counter means; means for increasing a counted value in said up/down counter means by M (M is a positive integer) when said signal is at a high level and decreasing a counted value in said up/down counter means by N (N is a positive integer) when said signal is at a low signal; count limit setting means connected to said up/down counter means and said means for increasing and decreasing for setting maximum and minimum count value limits in said up/down counter means; means for determining whether a mode change-over is to be effected in accordance with the count value of said up/down counter means.
Claim 7
Dependent Claim
172 words
A receiver having an automatic mode change-over function for changing between two operation modes, comprising: means for generating a signal having one of two possible levels in response to the level of electric field intensity of a received radio wave; sampling means including a sampling circuit for sampling said signal from said means for generating in response to sampling pulses from a sampling pulse generating circuit; up/down counter means; means for increasing a counted value in said up/down counter means by M (M is a positive integer) when said signal is at a high level and decreasing a counted value in said up/down counter means by N (N is a positive integer) when said signal is at a low signal; count limit setting means connected to said up/down counter means and said means for increasing and decreasing for setting maximum and minimum count value limits in said up/down counter means; means for determining whether a mode change-over is to be effected in accordance with the count value of said up/down counter means.
Claim 8
Dependent Claim
22 words
A receiver according to claim 5, wherein said sample pulse generating circuit produces said sampling pulses with a period of 17 milliseconds.
Claim 9
Dependent Claim
53 words
A receiver according to claim 5, wherein said means for determining includes first and second comparator means receiving the count value in said up/down counter for determining when said count value lies between respective upper and lower values, so that a correctly received radio wave is declared when said count value lies therebetween.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |