US5231390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective call receiver with decoder controlled filters
Assignee: Motorola Solutions Inc
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Filing: 1992-04-01
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Granted: 1993-07-27
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Expires: 2012-04-01
Abstract
Abstract A selective call receiver (100) includes a receiver (1104) for receiving a signal. The receiver (104) includes a controlled filter (142) having a variable frequency response. A decoder (106) coupled to the controlled filter (142) of the receiver (104) decodes the received signal. The decoder (106) has a decoder clock for generating a decoder clock signal (122). A controlled oscillator (134) has an input filter (136) controlled by a control signal (132). The controlled oscillator (134) generates an output signal (140) in response to the control signal (132) for coupling to a comparator (124) which generates the control signal (126) from the decoder clock signal (122) and the output signal (140). The control signal (126) is further coupled to the controlled filter(142) for controlling the frequency response of the controlled filter (142) which filters the received signal.
Inventors
- 👤 James G. Mittel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:15
CPC Classifications
G; G08; G08B; G08B3/00; G08B3/10; G08B3/1008; G08B3/1016; G08B3/1025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
122 words
A selective call receiver, comprising: receiving means for receiving a signal, said receiving means including a controlled filter having a variable frequency response; decoder means coupled to the controlled filter of said receiving means for decoding the received signal, said decoder means having a decoder clock for generating a decoder cock signal; and a controlled oscillator having an input filter controlled by a control signal, the controlled oscillator generating an output signal in response to the control signal for coupling to a comparing means which generates the control signal from the decoder clock signal and the output signal, the control signal is further coupled to the controlled filter for controlling the frequency response of the controlled filter for filtering the received signal.
Claim 2
Dependent Claim
122 words
A selective call receiver, comprising: receiving means for receiving a signal, said receiving means including a controlled filter having a variable frequency response; decoder means coupled to the controlled filter of said receiving means for decoding the received signal, said decoder means having a decoder clock for generating a decoder cock signal; and a controlled oscillator having an input filter controlled by a control signal, the controlled oscillator generating an output signal in response to the control signal for coupling to a comparing means which generates the control signal from the decoder clock signal and the output signal, the control signal is further coupled to the controlled filter for controlling the frequency response of the controlled filter for filtering the received signal.
Claim 3
Dependent Claim
26 words
The selective call receiver according to claim 1 wherein the comparing means comparing the output signal with the decoder clock signal for generating an error signal.
Claim 4
Dependent Claim
24 words
The selective call receiver according to claim 2 further comprises a loop filter for generating the control signal in response to the error signal.
Claim 5
Dependent Claim
25 words
The selective call receiver according to claim 1 wherein the frequency of the input filter is substantially lower than the frequency of the controlled filter.
Claim 6
Dependent Claim
23 words
The selective call receiver according to claim 1 wherein the output of the input filter is substantially equal to the decoder clock signal.
Claim 7
Independent Claim
75 words
A method for controlling a controlled filter from a decoder clock signal for filtering a received signal, comprising the steps of: (a) filtering the received signal with the controlled filter; (b) generating an output signal in response to the decoder clock signal; (c) comparing the decoder clock signal and the output signal to generate a control signal; (d) controlling the frequency response of the controlled filter with the control signal for filtering the received signal.
Claim 8
Independent Claim
75 words
A method for controlling a controlled filter from a decoder clock signal for filtering a received signal, comprising the steps of: (a) filtering the received signal with the controlled filter; (b) generating an output signal in response to the decoder clock signal; (c) comparing the decoder clock signal and the output signal to generate a control signal; (d) controlling the frequency response of the controlled filter with the control signal for filtering the received signal.
Claim 9
Dependent Claim
169 words
A selective call receiver comprising: receiving means for receiving a signal, the receiving means including a controlled filter having a variable frequency response; decoder means coupled to the receiving means for decoding the received signal, said decoder means including a decoder clock for generating a decoder clock signal independent of the received signal; a phase comparator means coupled to the decoder means for generating a control signal in response to the decoder clock signal; a controlled oscillator, coupled to the phase comparator, having an input filter controlled by the control signal, the controlled oscillator generating an output signal in response to the control signal, the control signal is further coupled to the controlled filter of the receiving means for controlling the frequency response of the controlled filter for filtering the received signal; means for comparing the output signal to the decoder clock signal for producing an error signal; and means for processing the error signal for generating the control signal for controlling the controlled filter and the controlled oscillator.
Claim 10
Dependent Claim
169 words
A selective call receiver comprising: receiving means for receiving a signal, the receiving means including a controlled filter having a variable frequency response; decoder means coupled to the receiving means for decoding the received signal, said decoder means including a decoder clock for generating a decoder clock signal independent of the received signal; a phase comparator means coupled to the decoder means for generating a control signal in response to the decoder clock signal; a controlled oscillator, coupled to the phase comparator, having an input filter controlled by the control signal, the controlled oscillator generating an output signal in response to the control signal, the control signal is further coupled to the controlled filter of the receiving means for controlling the frequency response of the controlled filter for filtering the received signal; means for comparing the output signal to the decoder clock signal for producing an error signal; and means for processing the error signal for generating the control signal for controlling the controlled filter and the controlled oscillator.
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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) | 1996-07-26 | 1997-01-25 | 1997-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-26 | 2001-01-25 | 2001-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-26 | 2005-01-25 | 2005-07-27 | $7700.00 | Window Closed / Lapsed |