Patent US5020076A successfully refreshed from Google Patents.
US5020076A
Expired / Lapsed
US
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Hybrid modulation apparatus
Assignee: NXP USA Inc
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Filing: 1990-05-21
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Granted: 1991-05-28
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Expires: 2010-05-21
Abstract
Abstract A pi /4-shift DQPSK modulator modulates a digitized voice signal and other information. An FM modulator modulates the analog voice signal and other information. The FM modulator is coupled to the quadrature mixers (109 and 110) of the pi /4-shift DQPSK modulator. When an FM modulated signal is required, the mixers (109 and 110) are biased (114) to allow carrier feedthrough by applying a fixed, non-zero DC signal to one or both mixers (109 and 110). The carrier is then FM modulated using conventional methods such as voltage-modulation of a phase locked loop (PPL) (113). When pi /4-shift DQPSK is to be generated, the conventional baseband I and Q vector-length signals (101 and 102) are applied to the mixers (109 and 110), and the carrier is left unmodulated by switching (115) out the input signal to the PLL (113). The PPL (113) will then generate only the carrier frequency to be mixed with the I and Q vector-length signals (101 and 102).
Inventors
- 👤 Stephen V. Cahill
- 👤 Steven F. Gillig
- 👤 Thomas J. Walczak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:36
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/002; H04B14/006; H04L; H04L27/00; H04L27/18; H04L27/20; H04L27/2032; H04L27/2053; H04L27/206; H04L27/2067; H04L27/2075
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
299 words
A hybrid modulation apparatus, with a voice signal input, having at least a digital mode and an analog mode, the apparatus comprising: (a) differential quadrature phase shift keying (DQPSK) means, coupled to the voice signal, for generating a π/4-shifted DQPSK signal in the digital mode, the means comprising: an I vector source coupled to an I vector path; and a Q vector source coupled to a Q vector path; (b) first mixing means having a first input, a second input, and an output, the first input coupled to the I vector path; (c) second mixing means having a first input, a second input, and an output, the first input coupled to the Q vector path; (d) offset oscillator means for generating a frequency modulated signal in the analog mode and a carrier frequency in the digital mode, the means having an output coupled to the second input of the first mixing means, and a modulation input; (e) switching means having a first input coupled to the voice signal, a second input coupled to ground potential, and an output coupled to the modulation input of the offset oscillator means, the switching means coupling the voice signal to the offset oscillator means in the analog mode and the ground potential to the offset oscillator means in the digital mode; (f) phase shifting means having an input and an output, the input coupled to the output of the offset oscillator means and the output coupled to the second input of the second mixing means; (g) control means coupled to the first input of the first mixing means, for enabling the analog mode; and (h) combining means, having an output, for combining the outputs of the first and second mixing means, the combining means output is an output of the hybrid modulation apparatus.
Claim 2
Dependent Claim
299 words
A hybrid modulation apparatus, with a voice signal input, having at least a digital mode and an analog mode, the apparatus comprising: (a) differential quadrature phase shift keying (DQPSK) means, coupled to the voice signal, for generating a π/4-shifted DQPSK signal in the digital mode, the means comprising: an I vector source coupled to an I vector path; and a Q vector source coupled to a Q vector path; (b) first mixing means having a first input, a second input, and an output, the first input coupled to the I vector path; (c) second mixing means having a first input, a second input, and an output, the first input coupled to the Q vector path; (d) offset oscillator means for generating a frequency modulated signal in the analog mode and a carrier frequency in the digital mode, the means having an output coupled to the second input of the first mixing means, and a modulation input; (e) switching means having a first input coupled to the voice signal, a second input coupled to ground potential, and an output coupled to the modulation input of the offset oscillator means, the switching means coupling the voice signal to the offset oscillator means in the analog mode and the ground potential to the offset oscillator means in the digital mode; (f) phase shifting means having an input and an output, the input coupled to the output of the offset oscillator means and the output coupled to the second input of the second mixing means; (g) control means coupled to the first input of the first mixing means, for enabling the analog mode; and (h) combining means, having an output, for combining the outputs of the first and second mixing means, the combining means output is an output of the hybrid modulation apparatus.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1 wherein the control means is a DC offset.
Claim 4
Dependent Claim
13 words
The apparatus of claim 1 wherein the control means is an offset current.
Claim 5
Dependent Claim
15 words
The apparatus of claim 1 wherein the phase shifting means is a 90° phase shifter.
Claim 6
Dependent Claim
21 words
The apparatus of claim 1 wherein the I vector path contains at least one filter and a digital to analog converter.
Claim 7
Dependent Claim
21 words
The apparatus of claim 1 wherein the Q vector path contains at least one filter and a digital to analog converter.
Claim 8
Dependent Claim
299 words
A hydrid modulation apparatus, with a voice signal input, having at least a digital mode and an analog mode, the apparatus comprising: (a) differential quadrature phase shift keying (DQPSK) means, coupled to the voice signal, for generating a π/4-shifted DQPSK signal in the digital mode, the means comprising: an I vector source coupled to an I vector path; and a Q vector source coupled to a Q vector path; (b) first mixing means having a first input, a second input, and an output, the first input coupled to the I vector path; (c) second mixing means having a first input, a second input, and an output, the first input coupled to the Q vector path; (d) offset oscillator means for generating a frequency modulated signal in the analog mode and a carrier frequency in the digital mode, the means having an output coupled to the second input of the first mixing means, and a modulation input; (e) switching means having a first input coupled to the voice signal, a second input coupled to ground potential, and an output coupled to the modulation input of the offset oscillator means, the switching means coupling the voice signal to the offset oscillator means in the analog mode and the ground potential to the offset oscillator means in the digital mode; (f) phase shifting means having an output and an input, the input coupled to the output of the offset oscillator means and the output coupled to the second input of the second mixing means; (g) control means coupled to the first input of the second mixing means, for enabling the analog mode; and (h) combining means, having an output, for combining the outputs of the first and second mixing means, the combining means output is an output of the hybrid modulation apparatus.
Claim 9
Dependent Claim
299 words
A hydrid modulation apparatus, with a voice signal input, having at least a digital mode and an analog mode, the apparatus comprising: (a) differential quadrature phase shift keying (DQPSK) means, coupled to the voice signal, for generating a π/4-shifted DQPSK signal in the digital mode, the means comprising: an I vector source coupled to an I vector path; and a Q vector source coupled to a Q vector path; (b) first mixing means having a first input, a second input, and an output, the first input coupled to the I vector path; (c) second mixing means having a first input, a second input, and an output, the first input coupled to the Q vector path; (d) offset oscillator means for generating a frequency modulated signal in the analog mode and a carrier frequency in the digital mode, the means having an output coupled to the second input of the first mixing means, and a modulation input; (e) switching means having a first input coupled to the voice signal, a second input coupled to ground potential, and an output coupled to the modulation input of the offset oscillator means, the switching means coupling the voice signal to the offset oscillator means in the analog mode and the ground potential to the offset oscillator means in the digital mode; (f) phase shifting means having an output and an input, the input coupled to the output of the offset oscillator means and the output coupled to the second input of the second mixing means; (g) control means coupled to the first input of the second mixing means, for enabling the analog mode; and (h) combining means, having an output, for combining the outputs of the first and second mixing means, the combining means output is an output of the hybrid modulation apparatus.
Claim 10
Dependent Claim
13 words
The apparatus of claim 7 wherein the control means is a DC offset.
Claim 11
Dependent Claim
13 words
The apparatus of claim 7 wherein the control means is an offset current.
Claim 12
Dependent Claim
15 words
The apparatus of claim 7 wherein the phase shifting means is a 90° phase shifter.
Claim 13
Dependent Claim
21 words
The apparatus of claim 7 wherein the I vector path contains at least one filter and a digital to analog converter.
Claim 14
Dependent Claim
21 words
The apparatus of claim 7 wherein the Q vector path contains at least one filter and a digital to analog converter.
Claim 15
Dependent Claim
303 words
A hybrid modulation apparatus, with a voice signal input, having at least a digital mode and an analog mode, the apparatus comprising: (a) differential quadrature phase shift keying (DQPSK) means, coupled to the voice signal, for generating a π/4-shifted DQPSK signal in the digital mode, the means comprising: an I vector source coupled to an I vector path; and a Q vector source coupled to a Q vector path; (b) first mixing means having a first input, a second input, and an output, the first input coupled to the I vector path; (c) second mixing means having a first input, a second input, and an output, the first input coupled to the Q vector path; and (d) offset oscillator means for generating a frequency modulated signal in the analog mode and a carrier frequency in the digital mode, the means having an output coupled to the second input of the first mixing means, and a modulation input; (e) switching means having a first input coupled to the voice signal, a second input coupled to ground potential, and an output coupled to the modulation input of the offset oscillator means, the switching means coupling the voice signal to the offset oscillator means in the analog mode and the ground potential to the offset oscillator means in the digital mode; (f) phase shifting means having an output and an input, the input coupled to the output of the offset oscillator means and the output coupled to the second input of the second mixing means; (g) control means coupled to the first input of the first and the second mixing means, for enabling the analog mode; and (h) combining means, having an output, for combining the outputs of the first and second mixing means, the combining means output is an output of the hybrid modulation apparatus.
Claim 16
Dependent Claim
303 words
A hybrid modulation apparatus, with a voice signal input, having at least a digital mode and an analog mode, the apparatus comprising: (a) differential quadrature phase shift keying (DQPSK) means, coupled to the voice signal, for generating a π/4-shifted DQPSK signal in the digital mode, the means comprising: an I vector source coupled to an I vector path; and a Q vector source coupled to a Q vector path; (b) first mixing means having a first input, a second input, and an output, the first input coupled to the I vector path; (c) second mixing means having a first input, a second input, and an output, the first input coupled to the Q vector path; and (d) offset oscillator means for generating a frequency modulated signal in the analog mode and a carrier frequency in the digital mode, the means having an output coupled to the second input of the first mixing means, and a modulation input; (e) switching means having a first input coupled to the voice signal, a second input coupled to ground potential, and an output coupled to the modulation input of the offset oscillator means, the switching means coupling the voice signal to the offset oscillator means in the analog mode and the ground potential to the offset oscillator means in the digital mode; (f) phase shifting means having an output and an input, the input coupled to the output of the offset oscillator means and the output coupled to the second input of the second mixing means; (g) control means coupled to the first input of the first and the second mixing means, for enabling the analog mode; and (h) combining means, having an output, for combining the outputs of the first and second mixing means, the combining means output is an output of the hybrid modulation apparatus.
Claim 17
Dependent Claim
26 words
The apparatus of claim 13 wherein the control means is an I and Q vector table that is input to the I and Q vector paths.
Claim 18
Dependent Claim
13 words
The apparatus of claim 13 wherein the control means is a DC offset.
Claim 19
Dependent Claim
13 words
The apparatus of claim 13 wherein the control means is an offset current.
Claim 20
Dependent Claim
21 words
The apparatus of claim 13 wherein the I vector path contains at least one filter and a digital to analog converter.
Claim 21
Dependent Claim
21 words
The apparatus of claim 13 wherein the Q vector path contains at least one filter and a digital to analog converter.
Claim 22
Dependent Claim
15 words
The apparatus of claim 13 wherein the phase shifting means is a 90° phase shifter.
Claim 23
Dependent Claim
304 words
A hybrid modulation apparatus having at least a digital mode and an analog mode, comprising: (a) differential quadrature phase shift keying (DQPSK) means for generating a π/4-shifted DQPSK signal in the digital mode, the means comprising: an I vector source coupled to an I vector path; a Q vector source coupled to a Q vector path; (b) first mixing means having a first input, a second input, a third input, a fourth input, and an output, the first input coupled to the I vector path; (c) second mixing means having a first input, a second input, a third input, a fourth input, and an output, the first input coupled to the Q vector path; and (d) offset oscillator means for generating a frequency modulated signal in the analog mode and a carrier frequency in the digital mode, the means having an output coupled to the second input of the first mixing means, and a modulation input; (e) switching means having a first input coupled to the voice signal, a second input coupled to ground potential, and an output coupled to the modulation input of the offset oscillator means, the switching means coupling the voice signal to the offset oscillator means in the analog mode and the ground potential to the offset oscillator means in the digital mode; (f) phase shifting means having an output and an input, the input coupled to the output of the offset oscillator means and the output coupled to the second input of the second mixing means; (g) control means coupled to the third and fourth inputs of at least one of the mixing means, for enabling the analog mode; and (h) combining means, having an output, for combining the outputs of the first and second mixing means, the combining means output is an output of the hybrid modulation apparatus.
Claim 24
Dependent Claim
304 words
A hybrid modulation apparatus having at least a digital mode and an analog mode, comprising: (a) differential quadrature phase shift keying (DQPSK) means for generating a π/4-shifted DQPSK signal in the digital mode, the means comprising: an I vector source coupled to an I vector path; a Q vector source coupled to a Q vector path; (b) first mixing means having a first input, a second input, a third input, a fourth input, and an output, the first input coupled to the I vector path; (c) second mixing means having a first input, a second input, a third input, a fourth input, and an output, the first input coupled to the Q vector path; and (d) offset oscillator means for generating a frequency modulated signal in the analog mode and a carrier frequency in the digital mode, the means having an output coupled to the second input of the first mixing means, and a modulation input; (e) switching means having a first input coupled to the voice signal, a second input coupled to ground potential, and an output coupled to the modulation input of the offset oscillator means, the switching means coupling the voice signal to the offset oscillator means in the analog mode and the ground potential to the offset oscillator means in the digital mode; (f) phase shifting means having an output and an input, the input coupled to the output of the offset oscillator means and the output coupled to the second input of the second mixing means; (g) control means coupled to the third and fourth inputs of at least one of the mixing means, for enabling the analog mode; and (h) combining means, having an output, for combining the outputs of the first and second mixing means, the combining means output is an output of the hybrid modulation apparatus.
Claim 25
Dependent Claim
21 words
The apparatus of claim 20 wherein the I vector path contains at least one filter and a digital to analog converter.
Claim 26
Dependent Claim
21 words
The apparatus of claim 20 wherein the Q vector path contains at least one filter and a digital to analog converter.
Claim 27
Dependent Claim
15 words
The apparatus of claim 20 wherein the phase shifting means is a 90° phase shifter.
Claim 28
Dependent Claim
13 words
The apparatus of claim 20 wherein the control means is a DC offset.
Claim 29
Dependent Claim
305 words
A communications apparatus, comprising: (a) receiving means; and (b) transmitting means, comprising: a hybrid modulation apparatus, with a voice signal input, having at least a digital mode and an analog mode, the hybrid modulation apparatus comprising: differential quadrature phase shift keying (DQPSK) means, coupled to the voice signal, for generating a π/4-shifted DQPSK signal in the digital mode, the means comprising: an I vector source coupled to an I vector path; and a Q vector source coupled to a Q vector path; first mixing means having a first input, a second input, and an output, the first input coupled to the I vector path; second mixing means having a first input, a second input, and an output, the first input coupled to the Q vector path; offset oscillator means for generating a frequency modulated signal in the analog mode and a carrier frequency in the digital mode, the means having an output coupled to the second input of the first mixing means, and a modulation input; switching means having a first input coupled to the voice signal, a second input coupled to ground potential, and an output coupled to the modulation input of the offset oscillator means, the switching means coupling the voice signal to the offset oscillator means in the analog mode and the ground potential to the offset oscillator means in the digital mode; phase shifting means having an input and an output, the input coupled to the output of the offset oscillator means and the output coupled to the second input of the second mixing means; control means coupled to the first input of the first mixing means, for enabling the analog mode; and combining means, having an output, for combining the outputs of the first and second mixing means, the combining means output is an output of the hybrid modulation apparatus.
Claim 30
Dependent Claim
305 words
A communications apparatus, comprising: (a) receiving means; and (b) transmitting means, comprising: a hybrid modulation apparatus, with a voice signal input, having at least a digital mode and an analog mode, the hybrid modulation apparatus comprising: differential quadrature phase shift keying (DQPSK) means, coupled to the voice signal, for generating a π/4-shifted DQPSK signal in the digital mode, the means comprising: an I vector source coupled to an I vector path; and a Q vector source coupled to a Q vector path; first mixing means having a first input, a second input, and an output, the first input coupled to the I vector path; second mixing means having a first input, a second input, and an output, the first input coupled to the Q vector path; offset oscillator means for generating a frequency modulated signal in the analog mode and a carrier frequency in the digital mode, the means having an output coupled to the second input of the first mixing means, and a modulation input; switching means having a first input coupled to the voice signal, a second input coupled to ground potential, and an output coupled to the modulation input of the offset oscillator means, the switching means coupling the voice signal to the offset oscillator means in the analog mode and the ground potential to the offset oscillator means in the digital mode; phase shifting means having an input and an output, the input coupled to the output of the offset oscillator means and the output coupled to the second input of the second mixing means; control means coupled to the first input of the first mixing means, for enabling the analog mode; and combining means, having an output, for combining the outputs of the first and second mixing means, the combining means output is an output of the hybrid modulation apparatus.
Claim 31
Dependent Claim
277 words
A hybrid modulation apparatus, with a voice signal input, having at least two modes of operation, the apparatus comprising: (a) first modulation means having an I source coupled to an I vector path, and a Q source coupled to a Q vector path; (b) first mixing means having a first input, a second input, and an output, the first input coupled to the I vector path; (c) second mixing means having a first input, a second input, and an output, the first input coupled to the Q vector path; and (d) offset oscillator means for generating a frequency modulated signal in a first mode and a carrier frequency in a second mode, the means having an output coupled to the second input of the first mixing means, and a modulation input; (e) switching means having a first input coupled to the voice signal, a second input coupled to ground potential, and an output coupled to the modulation input of the offset oscillator means, the switching means coupling the voice signal to the offset oscillator means in the first mode and the ground potential to the offset oscillator means in the second mode; (f) phase shifting means having an output and an input, the input coupled to the output of the offset oscillator means and the output coupled to the second input of the second mixing means; (g) control means coupled to the first input of the first and the second mixing means, for enabling the analog mode; and (h) combining means, having an output, for combining the outputs of the first and second mixing means, the combining means output is an output of the hybrid modulation apparatus.
Claim 32
Dependent Claim
277 words
A hybrid modulation apparatus, with a voice signal input, having at least two modes of operation, the apparatus comprising: (a) first modulation means having an I source coupled to an I vector path, and a Q source coupled to a Q vector path; (b) first mixing means having a first input, a second input, and an output, the first input coupled to the I vector path; (c) second mixing means having a first input, a second input, and an output, the first input coupled to the Q vector path; and (d) offset oscillator means for generating a frequency modulated signal in a first mode and a carrier frequency in a second mode, the means having an output coupled to the second input of the first mixing means, and a modulation input; (e) switching means having a first input coupled to the voice signal, a second input coupled to ground potential, and an output coupled to the modulation input of the offset oscillator means, the switching means coupling the voice signal to the offset oscillator means in the first mode and the ground potential to the offset oscillator means in the second mode; (f) phase shifting means having an output and an input, the input coupled to the output of the offset oscillator means and the output coupled to the second input of the second mixing means; (g) control means coupled to the first input of the first and the second mixing means, for enabling the analog mode; and (h) combining means, having an output, for combining the outputs of the first and second mixing means, the combining means output is an output of the hybrid modulation apparatus.
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