Patent US4829594A successfully refreshed from Google Patents.
US4829594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive correction of DC error transients
Assignee: Motorola Solutions Inc
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Filing: 1986-09-23
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Granted: 1989-05-09
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Expires: 2006-09-23
Abstract
Abstract A capacitor bias unit includes a first path (26) having a first impedance (29) and a second path (27) having a low impedance and a switch (31) connected between a voltage reference source and a capacitor (23). The capacitor can either be subjected to normal charge characterisitics or quick charge by closing the switch (31). Maintaining an appropriately charged state on the capacitor (23) aids in preventing netting error voltage steps from introducing DC component signals that adversely effect proper decoding and reception of demodulated data.
Inventors
- 👤 Joseph P. Heck
- 👤 Kha Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:17
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/34; H03G3/348
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
A radio receiver for receiving a broadcast signal of interest, comprising: output means for providing an output signal comprising information demodulated from said broadcast capacitor means operably coupled to said output means; capacitor bias means for biasing said capacitor means with a preselected DC reference voltage, comprising: a first path having a first resistance operably connected between said D.-C reference voltage and said capacitor means; and a second path having a second resistance operably connected between said DC reference voltage and said capacitor means, wherein said second resistance is less than said first resistance.
Claim 2
Dependent Claim
94 words
A radio receiver for receiving a broadcast signal of interest, comprising: output means for providing an output signal comprising information demodulated from said broadcast capacitor means operably coupled to said output means; capacitor bias means for biasing said capacitor means with a preselected DC reference voltage, comprising: a first path having a first resistance operably connected between said D.-C reference voltage and said capacitor means; and a second path having a second resistance operably connected between said DC reference voltage and said capacitor means, wherein said second resistance is less than said first resistance.
Claim 3
Dependent Claim
24 words
The radio receiver of claim 1 wherein said second path includes switch means for allowing said second path to be selectively closed and opened.
Claim 4
Dependent Claim
33 words
The radio receiver of claim 2 and further including channel control means for selecting said broadcast signal of interest from a plurality of broadcast signals to which said radio receiver may be tuned.
Claim 5
Dependent Claim
46 words
The radio receiver of claim 3 wherein said switch means are responsive to said channel control means such that said switch means will close said second path to connect said DC reference voltage to said capacitor whenever said channel control means selects a different broadcast signal.
Claim 6
Dependent Claim
28 words
The radio receiver of claim 4 and further including timing means for causing said switch means, when closed, to remain closed for only a predetermined period of time.
Claim 7
Dependent Claim
19 words
The radio receiver of claim 2 and further including signal detection means for detecting signal activity on a channel.
Claim 8
Dependent Claim
48 words
The radio receiver of claim 6 wherein said switch means are responsive to said signal detection means such that said switch means will close said second path to connect said DC reference voltage to said capacitor whenever said signal detection means first detects signal acitivity on a channel.
Claim 9
Dependent Claim
91 words
A radio receiver for receiving a broadcast signal of interest, comprising: output means for providing an output signal comprising information demodulated from said broadcast signal; capacitor means operably coupled to said output means; capacitor bias means for biasing said capacitor means with a DC voltage, comprising a first path having a first resistance operably connected between said DC voltage and said capacitor means; and a second path having a second resistance operably connected between said DC voltage and said capacitor means, wherein said second resistance is less than said first resistance.
Claim 10
Dependent Claim
91 words
A radio receiver for receiving a broadcast signal of interest, comprising: output means for providing an output signal comprising information demodulated from said broadcast signal; capacitor means operably coupled to said output means; capacitor bias means for biasing said capacitor means with a DC voltage, comprising a first path having a first resistance operably connected between said DC voltage and said capacitor means; and a second path having a second resistance operably connected between said DC voltage and said capacitor means, wherein said second resistance is less than said first resistance.
Claim 11
Dependent Claim
18 words
The radio receiver of claim 8 wherein said DC voltage appears at an output of said output means.
Claim 12
Dependent Claim
25 words
The radio receiver of claim 9 wherein said DC voltage and said output signal of said output means are provided at a common output thereof.
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) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |