Synchronous Amplitude Modulation Using Split Carrier Half-Cycles
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Solution Overview
Problem
Existing telecommunication systems are limited by the fundamental law of telecommunications, which requires the carrier frequency to be at least twice the maximum modulation frequency, restricting the transmission of information and generating excessive harmonics.
Innovation Solution
A synchronous modulation system using amplitude modulation that transmits different information in the positive and negative parts of the carrier wave, allowing transmission at frequencies twice the carrier frequency without generating excessive harmonics, utilizing a modulator and demodulator with programmable attenuators to synchronize and demodulate signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional amplitude modulation or frequency modulation is used, then information can be transmitted, but the carrier frequency must be at least twice the maximum modulation frequency, limiting transmission speed
Solution Approach 1:
The patent divides the carrier wave into separate positive and negative half-cycles, treating them as independent transmission channels. Each half-cycle carries distinct information, effectively doubling the information capacity within the same frequency band without violating the fundamental law of telecommunications.
Solution Approach 2:
The patent exploits the temporal dimension by utilizing both the positive and negative half-cycles of the carrier wave for simultaneous information transmission. This dimensional approach allows transmitting twice as much information within the same frequency constraints, achieving 4x faster transmission rates.
2Productivity
If combinations of amplitude modulation with frequency modulation are used to send more information, then transmission rate increases, but secondary harmonics are produced that widen the required bandwidth
Solution Approach 1:
The patent applies different modulation characteristics to different half-cycles of the carrier wave. The positive half-cycle uses one modulation scheme while the negative half-cycle uses another, allowing efficient use of the frequency spectrum without generating excessive harmonics that would expand bandwidth requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables transmission of digital information four times faster than traditional systems, within a limited bandwidth, with improved noise resistance and synchronization, and easy integration into wired or wireless telecommunication systems.
Implementation Method 1
a modulator formed by a microcontroller in charge of controlling a set of programmable attenuators to generate a certain degree of attenuation to both the positive and negative part of a signal used as carrier
Implementation Method 2
a demodulator that can accurately detect the attenuation levels imposed on each half cycle of oscillation of the carrier signal
Data Source
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AI summary
The invention relates to a synchronous modulation system using amplitude modulation, which basically consists of a modulator and a demodulator able to transmit digital signals at double the frequency of its carrier wave. For this purpose, the system uses analog and digital circuits that combine to modulate, separately, the positive half and the negative half of the carrier sine wave, such that in a single cycle of the carrier wave, two different information bits can be sent. The demodulator-modulator unit can be easily combined with other units to form wired or wireless communication systems and even optical or sonic systems with minimal generation of parasitic harmonics, resulting in a minimum bandwidth requirement for operation.