Method and apparatus for modulating and demodulating a carrier
First Claim
Patent Images
1. A method of generating a composite signal, comprising the steps of:
- generating a carrier having consecutive carrier cycles; and
inserting a modulated signal corresponding to an n-bit digital data byte between the consecutive carrier cycles to generate the composite signal.
2 Assignments
0 Petitions
Accused Products
Abstract
In a method and apparatus for generating a composite signal, a modulated signal corresponding to an n-bit digital data byte is inserted between consecutive carrier cycles of a carrier. The modulated signal is in the form of a ramp voltage of fixed duration and has a slope that corresponds to the n-bit digital data byte. The composite signal is demodulated by detecting the start of the modulated signal in the composite signal, determining the slope of the modulated signal, and converting the slope of the modulated signal into the n-bit digital data byte.
-
Citations
16 Claims
-
1. A method of generating a composite signal, comprising the steps of:
-
generating a carrier having consecutive carrier cycles; and inserting a modulated signal corresponding to an n-bit digital data byte between the consecutive carrier cycles to generate the composite signal. - View Dependent Claims (2)
-
-
3. A method of generating a composite signal, comprising the steps of:
-
providing a carrier wave generator for generating a first carrier cycle; providing a ramp voltage generator for generating a ramp voltage signal with a slope that corresponds to an n-bit digital data byte; controlling the ramp voltage generator so as to generate the ramp voltage signal for a predetermined duration at the end of the first carrier cycle; and controlling the carrier wave generator so as to generate a second carrier cycle at the end of the ramp voltage signal. - View Dependent Claims (4)
-
-
5. A modulating apparatus, comprising:
-
a carrier wave generator for generating a first carrier cycle; a ramp voltage generator for generating a ramp voltage signal with a slope that corresponds to an n-bit digital data byte; and control means connected to said carrier wave generator and said ramp voltage generator, said control means controlling said ramp voltage generator so as to generate the ramp voltage signal for a predetermined duration at the end of the first carrier cycle, said control means further controlling said carrier wave generator so as to generate a second carrier cycle at the end of the ramp voltage signal. - View Dependent Claims (6, 7, 8)
-
-
9. A method of demodulating a composite signal having a modulated signal corresponding to an n-bit digital data byte inserted between consecutive first and second carrier cycles, the modulated signal being in the form of a ramp voltage signal and having a slope that corresponds to the n-bit digital data byte, said method comprising the steps of:
-
detecting the start of the modulated signal in the composite signal; determining the slope of the modulated signal; and converting the slope of the modulated signal into the n-bit digital data byte. - View Dependent Claims (10, 11, 12)
-
-
13. A demodulating apparatus for demodulating a composite signal having a modulated signal corresponding to an n-bit digital data byte inserted between consecutive first and second carrier cycles, the modulated signal being in the form of a ramp voltage signal and having a slope that corresponds to the n-bit digital data byte, said demodulating apparatus comprising:
-
a position detector for detecting start of the modulated signal in the composite signal; computing means for determining slope of the modulated signal; and converting means for converting the slope of the modulated signal into the n-bit digital data byte. - View Dependent Claims (14, 15, 16)
-
Specification