US5201009A
Expired / Lapsed
US
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Signal processor
Assignee: Renesas Electronics Corp
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Filing: 1991-09-24
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Granted: 1993-04-06
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Expires: 2011-09-24
Abstract
Abstract An operational amplifier (1) and resistors (11) and (12) damp an input signal (V 1 ) by -6dB. Since a positive input terminal of the operational amplifier (1) is fixed at -3V, DC component of the input signal (V 1 ) is down-shifted to -3V so that a signal (V 2 ) is obtained. The signal (V 2 ) is inputted to an electronic volume (100) wherein the signal (V 2 ) is damped thereby a signal (V 3 ) is obtained. An operational amplifier (2) and resistors (13) and (14) amplify the signal (V 3 ) by 6dB. Since a positive input terminal of the operational amplifier (2) is fixed at OV, DC component of the signal (V 3 ) is up-shifted to OV thereby a signal (V 5 ) is obtained. The signal which is to be processed in the electronic volume has only a half voltage relative to that of the input signal.
Inventors
- 👤 Yusuke Yamada
- 👤 Tetsuya Murayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:35
CPC Classifications
H; H03; H03G; H03G5/00; H03G5/02; H03G5/025; H03G1/00; H03G1/0005; H03G1/0088; H03G3/00; H03G3/001
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
A signal processor comprising: a first processing part for damping an AC component of an input signal by a predetermined amount, while shifting a DC component of said input signal in a first direction so as to generate a first processing signal; a second processing part for processing said first processing signal so as to generate a second processing signal; and a third processing part for shifting a DC component of said second processing signal in a second direction which is opposite to said first direction, by an amount equal to a magnitude of the shifting performed by the first processing part, while amplifying an AC component of said second processing signal by an amount equal to a reciprocal of the predetermined damping amount performed by said first processing part so as to generate a third processing signal.
Claim 2
Dependent Claim
138 words
A signal processor comprising: a first processing part for damping an AC component of an input signal by a predetermined amount, while shifting a DC component of said input signal in a first direction so as to generate a first processing signal; a second processing part for processing said first processing signal so as to generate a second processing signal; and a third processing part for shifting a DC component of said second processing signal in a second direction which is opposite to said first direction, by an amount equal to a magnitude of the shifting performed by the first processing part, while amplifying an AC component of said second processing signal by an amount equal to a reciprocal of the predetermined damping amount performed by said first processing part so as to generate a third processing signal.
Claim 3
Dependent Claim
16 words
A signal processor in accordance with claim 1, wherein: said input signal is an analog signal.
Claim 4
Dependent Claim
22 words
A signal processor in accordance with claim 2, wherein: said first and said third processing parts are formed with respective operational amplifiers.
Claim 5
Dependent Claim
30 words
A signal processor in accordance with claim 3, wherein: said second processing part is biased with potential at one input terminal of said operational amplifier in said first processing part.
Claim 6
Dependent Claim
17 words
A signal processor in accordance with claim 1, wherein: said second processing part is an electronic volume.
Claim 7
Dependent Claim
146 words
A signal processor comprising: a first processing part for damping an AC component of an input signal by a predetermined amount, while shifting a DC component of said input signal in a first direction so as to generate a first processing signal; a second processing part for processing said first processing signal so as to generate a second processing signal, said second processing part being a graphic equalizer; and a third processing part for shifting a DC component of said second processing signal in a second direction which is opposite to said first direction, by an amount equal to a magnitude of the shifting performed by the first processing part, while amplifying an AC component of said second processing signal by an amount equal to a reciprocal of the predetermined damping amount performed by said first processing part so as to generate a third processing signal.
Claim 8
Dependent Claim
146 words
A signal processor comprising: a first processing part for damping an AC component of an input signal by a predetermined amount, while shifting a DC component of said input signal in a first direction so as to generate a first processing signal; a second processing part for processing said first processing signal so as to generate a second processing signal, said second processing part being a graphic equalizer; and a third processing part for shifting a DC component of said second processing signal in a second direction which is opposite to said first direction, by an amount equal to a magnitude of the shifting performed by the first processing part, while amplifying an AC component of said second processing signal by an amount equal to a reciprocal of the predetermined damping amount performed by said first processing part so as to generate a third processing signal.
Claim 9
Dependent Claim
128 words
A signal processor, comprising: means for generating an input signal having a maximum voltage of 14 V, peak to peak; a first processing part for damping an AC component of the input signal by a predetermined amount to generate a first processing signal having a voltage which is less than 8 V peak to peak; a second processing part comprising MOS circuitry for processing said first processing signal so as to generate a second processing signal; and a third processing part for amplifying an AC component of said second processing signal by an amount equal to a reciprocal of the predetermined damping amount performed by said first processing part so as to generate a third processing signal having a maximum voltage range of 14 V peak to peak.
Claim 10
Dependent Claim
128 words
A signal processor, comprising: means for generating an input signal having a maximum voltage of 14 V, peak to peak; a first processing part for damping an AC component of the input signal by a predetermined amount to generate a first processing signal having a voltage which is less than 8 V peak to peak; a second processing part comprising MOS circuitry for processing said first processing signal so as to generate a second processing signal; and a third processing part for amplifying an AC component of said second processing signal by an amount equal to a reciprocal of the predetermined damping amount performed by said first processing part so as to generate a third processing signal having a maximum voltage range of 14 V peak to peak.
Claim 11
Dependent Claim
99 words
A signal processor according to claim 7, wherein: the first processing part comprises means for shifting a DC component of said input signal in a first direction so that the first processing signal is both dampened and shifted; and the third processing part comprises means for shifting a DC component of said second processing signal in a second direction which is opposite to said first direction by an amount equal to a magnitude of the shifting performed by the first processing part such that the second processing signal is both shifted and amplified to form the third processing signal.
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) | 1996-04-05 | 1996-10-05 | 1997-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-05 | 2000-10-05 | 2001-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-05 | 2004-10-05 | 2005-04-06 | $7700.00 | Window Closed / Lapsed |