US4575585A
Expired / Lapsed
US
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Synchronous programmable signal generator and method
Assignee: Motorola Solutions Inc
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Filing: 1984-07-16
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Granted: 1986-03-11
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Expires: 2004-07-16
Abstract
Abstract A programmable signal generator and method for generating frequencies that are subharmonics of a rectified 60 hertz input signal. Opto-coupled triacs systematically switch and rectify the input signal frequency to provide, for example, a ringing signal for a telephone system.
Inventors
- 👤 Leland T. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:53
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02; H04M19/04
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
126 words
A programmable signal generator for producing an output signal having a frequency bearing a predetermined relationship to an input signal frequency comprising: frequency synthesizer means for generating a synchronous clocking signal in response to said input signal; counter means coupled to said clocking signal generating means for developing an address signal in response thereto; memory means coupled to said address signal developing means for providing predetermined first and second control signals in response thereto, said first and second control signals having respective passing and rectifying levels thereof; and first and second bilateral switching means for producing said output signal by alternately passing and rectifying selected portions of said input signal in response to said passing and rectifying levels of said first and second control signals respectively.
Claim 2
Dependent Claim
126 words
A programmable signal generator for producing an output signal having a frequency bearing a predetermined relationship to an input signal frequency comprising: frequency synthesizer means for generating a synchronous clocking signal in response to said input signal; counter means coupled to said clocking signal generating means for developing an address signal in response thereto; memory means coupled to said address signal developing means for providing predetermined first and second control signals in response thereto, said first and second control signals having respective passing and rectifying levels thereof; and first and second bilateral switching means for producing said output signal by alternately passing and rectifying selected portions of said input signal in response to said passing and rectifying levels of said first and second control signals respectively.
Claim 3
Dependent Claim
18 words
The programmable signal generator of claim 1 wherein said clocking signal generating means comprises a phase locked loop.
Claim 4
Dependent Claim
17 words
The programmable signal generator of claim 1 wherein said address signal developing means comprises a ripple counter.
Claim 5
Dependent Claim
18 words
The programmable signal generator of claim 1 wherein said control signal providing means comprises a programmable read-only memory.
Claim 6
Dependent Claim
18 words
the programmable signal generator of claim 1 wherein said first and second bilateral switching devices comprise opto-coupled triacs.
Claim 7
Dependent Claim
15 words
The programmable signal generator of claim 1 wherein said input signal frequency is 60 hertz.
Claim 8
Dependent Claim
15 words
The programmable signal generator of claim 1 wherein said output signal frequency is 20 hertz.
Claim 9
Independent Claim
103 words
A method for producing an output signal having a frequency bearing a predetermined relationship to an input signal frequency comprising the steps of: generating a synchronous clocking signal in response to said input signal; developing an address signal in response to said clocking signal; providing predetermined first and second control signals in response to said address signal, said first and second control signals having respective passing and rectifying levels thereof; rectifying selected portions of said input signal in response to said first and second control signal; and passing selected portions of said input signal in response to said first and second control signals.
Claim 10
Independent Claim
103 words
A method for producing an output signal having a frequency bearing a predetermined relationship to an input signal frequency comprising the steps of: generating a synchronous clocking signal in response to said input signal; developing an address signal in response to said clocking signal; providing predetermined first and second control signals in response to said address signal, said first and second control signals having respective passing and rectifying levels thereof; rectifying selected portions of said input signal in response to said first and second control signal; and passing selected portions of said input signal in response to said first and second control signals.
Claim 11
Dependent Claim
20 words
The method of claim 8 wherein said step of generating is carried out by means of a phase locked loop.
Claim 12
Dependent Claim
19 words
The method of claim 8 wherein said step of developing is carried out by means of a ripple counter.
Claim 13
Dependent Claim
20 words
The method of claim 8 wherein said step of providing is carried out by means of a programmable read-only memory.
Claim 14
Dependent Claim
18 words
The method of claim 8 wherein said steps of passing and rectifying are carried out by opto-coupled triacs.
Claim 15
Dependent Claim
135 words
A telephone system including a programmable signal generator for producing a ringing signal having a frequency bearing a predetermined relationship to a 60 hertz input signal comprising: frequency synthesizer means for generating a synchronous clocking signal in response to said 60 hertz input signal; counter means coupled to said clocking signal generating means for developing an address signal in response thereto; memory means coupled to said address signal developing means for providing predetermined first and second control signals in response thereto, said first and second control signals having respective passing and rectifying levels thereof; and first and second bilateral switching means for producing said ringing signal by alternately passing and rectifying selected portions of said 60 HZ input signal in response to said passing and rectifying levels of said first and second control signals respectively.
Claim 16
Dependent Claim
135 words
A telephone system including a programmable signal generator for producing a ringing signal having a frequency bearing a predetermined relationship to a 60 hertz input signal comprising: frequency synthesizer means for generating a synchronous clocking signal in response to said 60 hertz input signal; counter means coupled to said clocking signal generating means for developing an address signal in response thereto; memory means coupled to said address signal developing means for providing predetermined first and second control signals in response thereto, said first and second control signals having respective passing and rectifying levels thereof; and first and second bilateral switching means for producing said ringing signal by alternately passing and rectifying selected portions of said 60 HZ input signal in response to said passing and rectifying levels of said first and second control signals respectively.
Claim 17
Dependent Claim
17 words
The telephone system of claim 13 wherein said clocking signal generating means comprises a phase locked loop.
Claim 18
Dependent Claim
16 words
The telephone system of claim 13 wherein said address signal developing means comprises a ripple counter.
Claim 19
Dependent Claim
17 words
The telephone system of claim 13 wherein said control signal providing means comprises a programmable read-only memory.
Claim 20
Dependent Claim
17 words
The telephone system of claim 13 wherein said first and second bilateral switching devices comprise opto-coupled triacs.
Claim 21
Dependent Claim
15 words
The telephone system of claim 13 wherein said ringing signal frequency is substantially 20 hertz.
References Cited (Backward Citations)
US4220826A
Cited
US4349703A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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