An analog interpretation of compression for digital communication systems
نویسندگان
چکیده
The combination of a source coder and a digital modu-lator is in this article viewed as an analog-to-analog converter with signal compression ability. A reference channel with deened available bandwidth, total received power, and noise statistics, can transmit one analog source signal. Compression is here deened as the number of such source signals that the digital system can transmit over the reference channel, and reconstruct with the same delity as the transmitted analog source signal. An image transmission example is provided where, for a given delity on a reconstructed image, the obtainable compression ratio is found for a digital compression system based on subband coding and pulse amplitude modulation.
منابع مشابه
Improving adaptive resolution of analog to digital converters using least squares mean method
This paper presents an adaptive digital resolution improvement method for extrapolating and recursive analog-to-digital converters (ADCs). The presented adaptively enhanced ADC (AE-ADC) digitally estimates the digital equivalent of the input signal by utilizing an adaptive digital filter (ADF). The least mean squares (LMS) algorithm also determines the coefficients of the ADF block. In this sch...
متن کاملRobust image communication using subband coding and multilevel modulation
Visual communication systems can exploit the advantages of analog transmission and digital compression: Analog transmission allows the quality of the recovered data to vary gracefully as the channel conditions vary, whereas digital compression allows for powerful data reduction. In this paper, a system optimized for bandwidth-and power-limited channels which combines analog and digital communic...
متن کاملModeling and Simulation of Substrate Noise in Mixed-Signal Circuits Applied to a Special VCO
The mixed-signal circuits with both analog and digital blocks on a single chip have wide applications in communication and RF circuits. Integrating these two blocks can cause serious problems especially in applications requiring fast digital circuits and high performance analog blocks. Fast switching in digital blocks generates a noise which can be introduced to analog circuits by the common su...
متن کاملA New Approach to Objective Evaluation ofPower - and Bandwidth -
Integrated design of digital compression and modulation ooers performance advantages in practical systems over separate optimization. Integrated system design encourages more general compression deenitions. The total digital integrated transmission system is in this article viewed as an analog-to-analog converter with signal compression ability. A new deenition for compression is presented, inc...
متن کاملA Microcomputer-Based Simulator for Digital Control Systems
A microcomputer-based simulator for digital control systems is proposed. The proposed simulator is a hybrid system in which the plant is simulated by conventional method of analog computers and other parts of the system including generation of input signal is performed digitally, using a Z-80 based microcomputer. To overcome the difficulty of programming in assembly language, and at the same ti...
متن کامل