US3717816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impulse-scanned n-path filter for several frequency ranges
Assignee: Siemens AG
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Filing: 1971-03-19
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Granted: 1973-02-20
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Expires: 1991-03-19
Abstract
Abstract The use of N-path filters for converting a frequency to a lower frequency range is disclosed. The invention allows selectivity and frequency conversion. The arrangement according to this invention may be used as a secondary intermediate frequency stage of a double superhetrodyne receiver, for example. It may also be used as a selective multiple converter.
Inventors
- 👤 E Langer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:02
CPC Classifications
H; H03; H03D; H03D7/00; H03D2200/00; H03D2200/0041; H03D2200/006; H03D2200/0066; H03D2200/0078; H03D7/16; H03D7/161; H03D7/165
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
198 words
A double super heterodyne receiver arrangement for receiving a plurality of frequency bands, said radio receiver comprising: a first frequency band receiving channel including an intermediate frequency stage; a second frequency band receiving channel; an N-path filter means operating as a second intermediate frequency stage further comprising: a. an N-path input lead; b. an N position switching means connected to said input and having an output; c. N low pass filters connected to each of said N position switching means outputs; d. a second N position switching means connected to said N low pass filters, said second switching means switching said N low pass filter outputs to one output path, said output path being the output lead of said N-path filter; e. an impulse generator means for causing said switching means to scan said N-paths, the frequency of said impulse generator means being equal to a lower harmonic of the center frequency of the received frequency bands of the receiver arrangement; a switching means connected to said N-path filter input lead for switching between the said first and second frequency band receiving channels; and a band pass filter means connected to the output lead of said Npath filter.
Claim 2
Dependent Claim
198 words
A double super heterodyne receiver arrangement for receiving a plurality of frequency bands, said radio receiver comprising: a first frequency band receiving channel including an intermediate frequency stage; a second frequency band receiving channel; an N-path filter means operating as a second intermediate frequency stage further comprising: a. an N-path input lead; b. an N position switching means connected to said input and having an output; c. N low pass filters connected to each of said N position switching means outputs; d. a second N position switching means connected to said N low pass filters, said second switching means switching said N low pass filter outputs to one output path, said output path being the output lead of said N-path filter; e. an impulse generator means for causing said switching means to scan said N-paths, the frequency of said impulse generator means being equal to a lower harmonic of the center frequency of the received frequency bands of the receiver arrangement; a switching means connected to said N-path filter input lead for switching between the said first and second frequency band receiving channels; and a band pass filter means connected to the output lead of said Npath filter.
Claim 3
Dependent Claim
198 words
A double super heterodyne receiver arrangement for receiving a plurality of frequency bands, said radio receiver comprising: a first frequency band receiving channel including an intermediate frequency stage; a second frequency band receiving channel; an N-path filter means operating as a second intermediate frequency stage further comprising: a. an N-path input lead; b. an N position switching means connected to said input and having an output; c. N low pass filters connected to each of said N position switching means outputs; d. a second N position switching means connected to said N low pass filters, said second switching means switching said N low pass filter outputs to one output path, said output path being the output lead of said N-path filter; e. an impulse generator means for causing said switching means to scan said N-paths, the frequency of said impulse generator means being equal to a lower harmonic of the center frequency of the received frequency bands of the receiver arrangement; a switching means connected to said N-path filter input lead for switching between the said first and second frequency band receiving channels; and a band pass filter means connected to the output lead of said N-path filter.
Claim 4
Dependent Claim
198 words
A double super heterodyne receiver arrangement for receiving a plurality of frequency bands, said radio receiver comprising: a first frequency band receiving channel including an intermediate frequency stage; a second frequency band receiving channel; an N-path filter means operating as a second intermediate frequency stage further comprising: a. an N-path input lead; b. an N position switching means connected to said input and having an output; c. N low pass filters connected to each of said N position switching means outputs; d. a second N position switching means connected to said N low pass filters, said second switching means switching said N low pass filter outputs to one output path, said output path being the output lead of said N-path filter; e. an impulse generator means for causing said switching means to scan said N-paths, the frequency of said impulse generator means being equal to a lower harmonic of the center frequency of the received frequency bands of the receiver arrangement; a switching means connected to said N-path filter input lead for switching between the said first and second frequency band receiving channels; and a band pass filter means connected to the output lead of said N-path filter.
Claim 5
Dependent Claim
29 words
A receiver according to claim 1 wherein said band pass filter means has a pass band which is an integral fraction for a multiple of the received frequency bands.
References Cited (Backward Citations)
US2584986A
Cited
US3205310A
Cited
US3399278A
Cited
US3414821A
Cited
US3359370A
Cited
US3462554A
Cited
US3445685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |