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US5534827A
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Modulator
Assignee: Toshiba Corp
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Filing: 1993-03-19
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Granted: 1996-07-09
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Expires: 2013-03-19
Abstract
Abstract In an amplitude modulator, a delta sigma modulator converts a digital or analog modulation signal into a binary signal. The binary signal and a carrier signal are sent to a multiplication circuit. The phase of the carrier signal is changed to normal phase or opposite phase. The resultant carrier signal is output as an amplitude modulation wave. An orthogonal modulator sends a local oscillation signal to a phase shifter. The phase shifter outputs two carrier signals with phases which differ by 90° each other. The modulation signal and carrier signals are sent to the amplitude modulator. The amplitude modulator outputs an amplitude modulation signal. These signals are sent to an analog signal composing unit. The analog signal composing unit composes the input signals and outputs an amplitude and phase modulation signal.
Inventors
- 👤 Takafumi Yamaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:58
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/36; H04L27/362; H03; H03C; H03C1/00; H03C5/00; H03F; H03F3/00; H03F3/20; H03F3/24; H03F2200/00; H03F2200/331
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
41 words
A modulator, comprising: a delta sigma modulator for converting a modulation signal into a ternary signal, and multiplication means for multiplying said ternary signal and a carrier signal and for outputting the product of said carrier signal and said ternary signal.
Claim 2
Dependent Claim
41 words
A modulator, comprising: a delta sigma modulator for converting a modulation signal into a ternary signal, and multiplication means for multiplying said ternary signal and a carrier signal and for outputting the product of said carrier signal and said ternary signal.
Claim 3
Dependent Claim
18 words
The modulator as set forth in claim 1, wherein values the ternary signal are 1, 0 and -1.
Claim 4
Dependent Claim
17 words
The modulator as set forth in claim 1, wherein the multiplication means is an analog multiplication circuit.
Claim 5
Dependent Claim
30 words
The modulator as set forth in claim 3, wherein the analog multiplication circuit is selected from a group consisting of: a Gilbert multiplication circuit and a diode ring modulation circuit.
Claim 6
Dependent Claim
16 words
The modulator as set forth in claim 1, wherein the multiplication means is an exclusive-OR circuit.
Claim 7
Dependent Claim
51 words
A modulator, comprising: a delta sigma modulator for converting a modulation signal into a binary signal, and multiplication means for multiplying said binary signal and a carrier signal and for outputting the product of said carrier signal and said binary signal, wherein values of the binary signal are 1 and -1.
Claim 8
Dependent Claim
51 words
A modulator, comprising: a delta sigma modulator for converting a modulation signal into a binary signal, and multiplication means for multiplying said binary signal and a carrier signal and for outputting the product of said carrier signal and said binary signal, wherein values of the binary signal are 1 and -1.
Claim 9
Dependent Claim
17 words
The modulator as set forth in claim 6, wherein the multiplication means is an analog multiplication circuit.
Claim 10
Dependent Claim
50 words
A modulator comprising: a delta sigma modulator for converting a modulation signal into a binary signal, and multiplication means for multiplying said binary signal and a carrier signal, and for changing the phase of the carrier signal to a normal phase or an opposite phase according to the binary signal.
Claim 11
Dependent Claim
50 words
A modulator comprising: a delta sigma modulator for converting a modulation signal into a binary signal, and multiplication means for multiplying said binary signal and a carrier signal, and for changing the phase of the carrier signal to a normal phase or an opposite phase according to the binary signal.
Claim 12
Dependent Claim
141 words
A modulator, comprising; phase shift means for converting an input signal into a first carrier signal of one phase and a second carrier signal of another phase, the phase of the first carrier signal and the phase of the second carrier signal differing by 90°; a first delta sigma modulator for converting a first modulation signal into a binary or ternary signal; first multiplication means for multiplying the first binary or ternary signal by the first carrier signal; a second delta sigma modulator for converting a second modulation signal into a second binary or ternary signal; second multiplication means for multiplying the second binary or ternary signal by the second carrier signal; and composition means for composing an output of the first multiplication means and an output of the second multiplication means and for outputting an amplitude and phase modulation signal.
Claim 13
Dependent Claim
141 words
A modulator, comprising; phase shift means for converting an input signal into a first carrier signal of one phase and a second carrier signal of another phase, the phase of the first carrier signal and the phase of the second carrier signal differing by 90°; a first delta sigma modulator for converting a first modulation signal into a binary or ternary signal; first multiplication means for multiplying the first binary or ternary signal by the first carrier signal; a second delta sigma modulator for converting a second modulation signal into a second binary or ternary signal; second multiplication means for multiplying the second binary or ternary signal by the second carrier signal; and composition means for composing an output of the first multiplication means and an output of the second multiplication means and for outputting an amplitude and phase modulation signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-09 | 2000-01-08 | 2000-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-09 | 2004-01-08 | 2004-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-09 | 2008-01-08 | 2008-07-09 | $7700.00 | Window Closed / Lapsed |