US5230095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio receiver for data communication
Assignee: Canon Inc
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Filing: 1991-04-19
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Granted: 1993-07-20
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Expires: 2011-04-19
Abstract
Abstract A radio receiver for data communication of the type handing digital signals has a radio frequency (RF) section for receiving an RF signal having a predetermined frequency band from an electromagnetic wave which comes in through an antenna. A first frequency converting section converts the RF signal received by the RF section to a first intermediate frequency (IF) signal. A first IF filter filters the first IF signal and is implemented by a surface acoustic wave filter. A second frequency converting section converts the output signal of the first IF filter to a second IF signal. A data amplifying section picks up the above-mentioned frequency band from the output of the second frequency converting section and amplifies the resultant, picked-up band. A detector detects the output of the data amplifying section. An equalizer corrects a deviation of group delay time with each of respective frequencies of the output of the detector.
Inventors
- 👤 Tetsuo Onodera
- 👤 Kazuhide Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:59
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/26; H04B7/00; H04B7/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
273 words
A radio receiver for digital data communication, comprising: a radio frequency section for receiving a radio frequency signal having a predetermined frequency band from an electromagnetic wave coming in through an antenna; a first frequency converting section for converting said radio frequency signal received by said radio frequency section to first intermediate frequency signal; a first intermediate frequency filter for filtering said first intermediate frequency signal; a second frequency converting section for converting an output signal of said first intermediate frequency filter to a second intermediate frequency signal; a data signal amplifying section for isolating said frequency band from an output of said second frequency converting section and amplifying a result of isolation; a detector for detecting an output of said data signal amplifying section; and an equalizer for correcting a deviation of group delay time with each of respective frequencies of an output of said detector wherein; said first intermediate frequency filter comprises a surface acoustic wave filter; said data signal amplifying section includes: a second intermediate frequency filter for isolating a desired signal wave from the second intermediate frequency signal fed from said second frequency converting section at least one amplifier for amplifying an output of said second intermediate frequency filter; and a tuning circuit for filtering an output of said amplifier; and said equalizer comprises a phase circuit for producing a predetermined phase of the data signal based on the signal fed from said detector; and a non-inverting amplifier circuit for outputting a desired data signal which is reduced in delay time relative to the data signal from said detector based on the predetermined phase fed from said phase circuit.
Claim 2
Dependent Claim
273 words
A radio receiver for digital data communication, comprising: a radio frequency section for receiving a radio frequency signal having a predetermined frequency band from an electromagnetic wave coming in through an antenna; a first frequency converting section for converting said radio frequency signal received by said radio frequency section to first intermediate frequency signal; a first intermediate frequency filter for filtering said first intermediate frequency signal; a second frequency converting section for converting an output signal of said first intermediate frequency filter to a second intermediate frequency signal; a data signal amplifying section for isolating said frequency band from an output of said second frequency converting section and amplifying a result of isolation; a detector for detecting an output of said data signal amplifying section; and an equalizer for correcting a deviation of group delay time with each of respective frequencies of an output of said detector wherein; said first intermediate frequency filter comprises a surface acoustic wave filter; said data signal amplifying section includes: a second intermediate frequency filter for isolating a desired signal wave from the second intermediate frequency signal fed from said second frequency converting section at least one amplifier for amplifying an output of said second intermediate frequency filter; and a tuning circuit for filtering an output of said amplifier; and said equalizer comprises a phase circuit for producing a predetermined phase of the data signal based on the signal fed from said detector; and a non-inverting amplifier circuit for outputting a desired data signal which is reduced in delay time relative to the data signal from said detector based on the predetermined phase fed from said phase circuit.
Claim 3
Dependent Claim
17 words
A radio receiver in accordance with claim 1, wherein said turning circuit comprises a single tuning circuit.
Claim 4
Dependent Claim
17 words
A radio receiver in accordance with claim 1, wherein said tuning circuit comprises a double tuning circuit.
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) | 1996-07-19 | 1997-01-18 | 1997-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-19 | 2001-01-18 | 2001-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-19 | 2005-01-18 | 2005-07-20 | $7700.00 | Window Closed / Lapsed |