US4054844A
Expired / Lapsed
US
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Amplifying system
Assignee: Nippon Gakki Co Ltd
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Filing: 1976-04-13
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Granted: 1977-10-18
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Expires: 1996-04-13
Abstract
Abstract An amplifying system comprises an amplifier having a certain constant gain, a first variable attenuator through which an input signal for this system is inputted to the amplifier, and a second variable attenuator through which the output signal of the amplifier is delivered. The over-all gain of the system is variable from the minimum gain to the maximum gain by gang-operating the two variable attenuators. The two variable attenuators are of such a construction that the attenuation factor of the first attenuator is substantially variable in the operation range near the middle of the variable gain whereas that of the second attenuator is substantially variable in the operation ranges near the minimum and maximum of the variable gain. When the input signal level is low, the second attenuator functions in the near-maximum range, and when high, the first attenuator functions in the middle range, thus delivering an output signal at the rated level. To decrease the output level further, the second attenuator functions in the near-minimum range. The S/N ratio of the output signal is good for various input signal level.
Inventors
- 👤 Kenro Oguri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:29
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/02; H03G3/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
272 words
An amplifying system having an overall gain which is adjustable for a gain-variable range which is set for this amplifying system, comprising: a first variable attenuating means for receiving an input signal for the amplifying system to thereby deliver out said input signal of the level attenuated by this variable attenuating means, an amplifier having a certain gain for amplifying the signal derived from said first variable attenuating means, a second variable attenuating means for receiving the output signal of said amplifier to deliver out, as an output signal of the amplifying system, said received output signal of the level attenuated by this variable attenuating means, said over-all gain being varied for said gain-variable range depending upon the total of the respective attenuation factors of said first and second variable attenuating means, said gain-variable range including at least a first sub-range covering from the maximum gain value of said gain-variable range to a first gain value which is less than said maximum gain value and a second sub-range covering from said first gain value to a second gain value which is less than said first gain value, and movable means ganging said first and second variable attenuating means for mutually substantially exclusively changing the respective attenuation factors of said first and second variable attenuating means so that by one movement of said ganging means said second variable attenuating means changes said over-all gain with respect mainly to said first sub-range of said gain-variable range and by another movement of said ganging means said first variable attenuating means changes said over-all gain with respect mainly to said second sub-range of said gain-variable range.
Claim 2
Dependent Claim
272 words
An amplifying system having an overall gain which is adjustable for a gain-variable range which is set for this amplifying system, comprising: a first variable attenuating means for receiving an input signal for the amplifying system to thereby deliver out said input signal of the level attenuated by this variable attenuating means, an amplifier having a certain gain for amplifying the signal derived from said first variable attenuating means, a second variable attenuating means for receiving the output signal of said amplifier to deliver out, as an output signal of the amplifying system, said received output signal of the level attenuated by this variable attenuating means, said over-all gain being varied for said gain-variable range depending upon the total of the respective attenuation factors of said first and second variable attenuating means, said gain-variable range including at least a first sub-range covering from the maximum gain value of said gain-variable range to a first gain value which is less than said maximum gain value and a second sub-range covering from said first gain value to a second gain value which is less than said first gain value, and movable means ganging said first and second variable attenuating means for mutually substantially exclusively changing the respective attenuation factors of said first and second variable attenuating means so that by one movement of said ganging means said second variable attenuating means changes said over-all gain with respect mainly to said first sub-range of said gain-variable range and by another movement of said ganging means said first variable attenuating means changes said over-all gain with respect mainly to said second sub-range of said gain-variable range.
Claim 3
Dependent Claim
58 words
An amplifying system according to claim 1, in which: said gain-variable range further includes a third subrange covering from said second gain value to zero, the attenuation factor of mainly said second variable attenuating means being varied by operation of said ganging means to change said over-all gain with respect to said third sub-range of said gain-variable range.
Claim 4
Dependent Claim
126 words
An amplifying system according to claim 2, in which: said first variable attenuating means comprises a first potentiometer having a first fixed terminal connected to an input terminal being applied with said input signal for the amplifying system, a second fixed terminal grounded via a resistor, and a first slider tap connected to the input terminal of said amplifier, and in which: said second variable attenuating means comprises a second potentiometer having a third fixed terminal connected to the output terminal of said amplifier, a fourth fixed terminal grounded, and a second slider terminal connected to an output terminal from which said output signal of the amplifying system is delivered, said first and second slider taps being gang-operative by said operation for adjusting the over-all gain.
Claim 5
Dependent Claim
197 words
An amplifying system according to claim 3, in which: said first slider tap is slidable in contact with a first series connection of said first potentiometer which connection consists of a first resistor element, and a first and second conductor elements conected together through said first resistor element interposed therebetween, in said first potentiometer, said first and second fixed terminals being connected to the respective ends of said first series connection, and in which: said second slider tap is slidable in contact with second series connection of said second potentiometer which connection consists of third conductor element, and a second and third resistor elements connected together through said third conductor element interposed therebetween, said first and second slider taps being moved by said same single adjusting gaining means to be positioned at certain corresponding points on both said first conductor element and second resistor element, respectively, with respect to said first sub-range; at certain corresponding points on both said first resistor element and said third conductor element, respectively, with respect to said second sub-range; and, at certain corresponding points on both said second conductor element and said third resistor element, respectively, with respect to said third sub-range.
Claim 6
Dependent Claim
192 words
An amplifying system according to claim 4, in which: said first, second and third resistor elements and said resistor having such resistance values thereof that, when said first and second slider taps are positioned at the respective junctions both of said first conductor element and said first resistor element and of said second resistor element and said third conductor element, the attenuation factor by said second variable attenuating means is (B-D)dB; and that, when said first and second slider taps are positioned at the respective junctions both of said first resistor element and said second conductor element and of said third conductor element and said third resistor element, respectively, the total of the respective attenuation factors by said first signal-level attenuating means is [C-(B-A)]dB, wherein: C represents the allowable maximum level of said input signal; D represents the rated maximum level of said output signal of the amplifying system; B represents the allowable maximum level of the output signal of said amplifier which can be delivered out by said amplifier without any distortion of this output signal resulting from the saturation of this amplifier; and A represents the gain of the amplifier.
Claim 7
Dependent Claim
222 words
An amplifying system having an over-all gain which is adjustable for a gain-variable range which is set for this amplifying system, comprising: a first variable attenuating means for receiving an inut signal for the amplifying system to thereby deliver out said input signal of the level attenuated by this variable attenuating means, an amplifier having a certain gain for amplifying the signal derived from said first variable attenuating means, a second variable attenuating means for receiving the output signal of said amplifier to deliver out, as an output signal of the amplifying system, said received output signal of the level attenuated by this variable attenuating means, said over-all gain being varied for said gain-variable range depending upon the total of the respective attenuation factors of said first and second variable attenuating means, said gain-variable range including at least a first sub-range covering from the maximum gain value of said gain-variable range to a first gain value which is less than said maximum gain value and a second sub-range covering from said first gain value to a second gain value which is less than said first gain value, and movable means ganging said first and second variable attenuating means for mutually substantially exclusively changing the respective attenuation factors of said first and second variable attenuating means as to said first and second sub-ranges.
Claim 8
Dependent Claim
222 words
An amplifying system having an over-all gain which is adjustable for a gain-variable range which is set for this amplifying system, comprising: a first variable attenuating means for receiving an inut signal for the amplifying system to thereby deliver out said input signal of the level attenuated by this variable attenuating means, an amplifier having a certain gain for amplifying the signal derived from said first variable attenuating means, a second variable attenuating means for receiving the output signal of said amplifier to deliver out, as an output signal of the amplifying system, said received output signal of the level attenuated by this variable attenuating means, said over-all gain being varied for said gain-variable range depending upon the total of the respective attenuation factors of said first and second variable attenuating means, said gain-variable range including at least a first sub-range covering from the maximum gain value of said gain-variable range to a first gain value which is less than said maximum gain value and a second sub-range covering from said first gain value to a second gain value which is less than said first gain value, and movable means ganging said first and second variable attenuating means for mutually substantially exclusively changing the respective attenuation factors of said first and second variable attenuating means as to said first and second sub-ranges.
Claim 9
Dependent Claim
236 words
An amplifying system having an over-all gain which is adjustable for a gain-variable range which is set for this amplifying system, comprising: a first variable attenuating means for receiving an input signal for the amplifying system to thereby deliver out said input signal of the level attenuated by this variable attenuating means, an amplifier having a certain gain for amplifying the signal derived from said first variable attenuating means, and a second variable attenuating means for receiving the output signal of said amplifier to deliver out, as an output signal of the amplifying system, said received output signal of the level attenuated by this variable attenuating means, said over-all gain being varied for said gain-variable range depending upon the total of the respective attenuation factors of said first and second variable attenuating means, said gain-variable range including at least a first sub-range covering from the maximum gain value of said gain-variable range to a first gain value which is less than said maximum gain value and a second sub-range covering from said first gain value to a second gain value which is less than said first gain value, said first and second variable attenuating means having a first set of different resistive values for said first sub-range and a second set of different resistive values for said second sub-range and being ganged so that both attenuating means operate in the same sub-range at the same time.
Claim 10
Dependent Claim
236 words
An amplifying system having an over-all gain which is adjustable for a gain-variable range which is set for this amplifying system, comprising: a first variable attenuating means for receiving an input signal for the amplifying system to thereby deliver out said input signal of the level attenuated by this variable attenuating means, an amplifier having a certain gain for amplifying the signal derived from said first variable attenuating means, and a second variable attenuating means for receiving the output signal of said amplifier to deliver out, as an output signal of the amplifying system, said received output signal of the level attenuated by this variable attenuating means, said over-all gain being varied for said gain-variable range depending upon the total of the respective attenuation factors of said first and second variable attenuating means, said gain-variable range including at least a first sub-range covering from the maximum gain value of said gain-variable range to a first gain value which is less than said maximum gain value and a second sub-range covering from said first gain value to a second gain value which is less than said first gain value, said first and second variable attenuating means having a first set of different resistive values for said first sub-range and a second set of different resistive values for said second sub-range and being ganged so that both attenuating means operate in the same sub-range at the same time.
Claim 11
Dependent Claim
65 words
An amplifying system as in claim 7 wherein: as to said first sub-range the said resistive, value of the second variable attenuating means is far larger than the said value of the first variable attenuating means, and as to said second sub-range the said resistive value of the first variable attentuating means is far larger than the second value of said second variable attentuating means.
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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |