This article proposes a space vector-based, pulse code modulation (PCM) scheme with reduced zero sequence voltage for an Open-End-Winding-Induction-Motor (OEWIM) fed by two-level inverters on both sides. A multilevel ...
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This article proposes a space vector-based, pulse code modulation (PCM) scheme with reduced zero sequence voltage for an Open-End-Winding-Induction-Motor (OEWIM) fed by two-level inverters on both sides. A multilevel inverter fed induction motor drive using Space Vector Sigma Delta modulation (SVSDM) can be considered to be an analogy of a digital communication system. In the proposed scheme, the nearest three space vectors to the integrated error vector of the sigma delta modulator form the Thiessen region. In the Thiessen region, the reference vector gets quantized to its closest space vector in a sampling period. This reduces spurious switching. The quantized space vector is encoded to ones and zeros corresponding to the ON and OFF states of the inverter switches. In the proposed PCM, redundant switching vectors with reduced Zero Sequence Voltage (ZSV) are selected in the three-level operation. This results in reducing the ZSV without a reduction in the DC bus utilization. The proposed PCM is verified on a 3 HP OEWIM that is supplied with power from 11.5 KVA two-level inverters on both ends. Results of comparing the performance of the proposed PCM with those of existing modulation schemes are presented.
In this paper, we present an approach for investigating the pulse code modulation for signals with various shape forms. We have developed an algorithm as well as its course of implementation in MATLAB and Octave envir...
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ISBN:
(纸本)9781728171432
In this paper, we present an approach for investigating the pulse code modulation for signals with various shape forms. We have developed an algorithm as well as its course of implementation in MATLAB and Octave environments. The software we have implemented makes it possible to investigate the pulse code modulation of various analog signals along with the signal parameter influence and parameters of PCM on the discrete and digital signals. It is possible to use the presented approach in education, in the field of engineering, to study this process.
NASA Technical Reports Server (Ntrs) 19870002483: pulse code modulation (Pcm) Encoder Handbook for Aydin Vector Mmp-600 Series System by NASA Technical Reports Server (Ntrs); published by
NASA Technical Reports Server (Ntrs) 19870002483: pulse code modulation (Pcm) Encoder Handbook for Aydin Vector Mmp-600 Series System by NASA Technical Reports Server (Ntrs); published by
NASA Technical Reports Server (Ntrs) 19950021014: pulse code modulation (Pcm) Encoder Handbook for Aydin Vector Mmp-900 Series System by NASA Technical Reports Server (Ntrs); published by
NASA Technical Reports Server (Ntrs) 19950021014: pulse code modulation (Pcm) Encoder Handbook for Aydin Vector Mmp-900 Series System by NASA Technical Reports Server (Ntrs); published by
NASA Technical Reports Server (Ntrs) 20060056107: Two Serial Data to pulse code modulation System Interfaces by NASA Technical Reports Server (Ntrs); published by
NASA Technical Reports Server (Ntrs) 20060056107: Two Serial Data to pulse code modulation System Interfaces by NASA Technical Reports Server (Ntrs); published by
NASA Technical Reports Server (Ntrs) 19870003285: pulse code modulation (Pcm) Data Storage and Analysis Using a Microcomputer by NASA Technical Reports Server (Ntrs); published by
NASA Technical Reports Server (Ntrs) 19870003285: pulse code modulation (Pcm) Data Storage and Analysis Using a Microcomputer by NASA Technical Reports Server (Ntrs); published by
The on-board telemetry system of an aerospace vehicle sends the vehicle performance parameters to the ground receiving station at all instances of its trajectory. During the course of its trajectory, the communication...
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The on-board telemetry system of an aerospace vehicle sends the vehicle performance parameters to the ground receiving station at all instances of its trajectory. During the course of its trajectory, the communication channel of a long range vehicle, experiences various phenomena such as plume attenuation, stage separation, manoeuvring of a vehicle and RF blackout, causing loss of valuable telemetry data. The loss of communication link is inevitable due to these harsh conditions even when using the space diversity of ground receiving systems. Conventional telemetry systems do not provide redundant data for long range aerospace vehicles. This research work proposes an innovative delay data transmission, frame switchover and multiple frames data transmission schemes to improve the availability of telemetry data at ground receiving stations. The proposed innovative schemes are modelled using VHDL and extensive simulations have been performed to validate the results. The functionally simulated net list has been synthesised with 130 nm ACTEL flash based FPGA and verified on telemetry hardware.
pulse code modulation(PCM) and Delta modulation(DM) are important techniques in data conversion and transmission, which have significant impact on the quality of digital signal transmission. The principles of these en...
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In the conventional airborne telemetry system, the pre-modulation filter with a multi-pole active Bessel filter is preferred to use in pulsecode Modulator (PCM)/FM transmission. In the existing system, it is not poss...
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In the conventional airborne telemetry system, the pre-modulation filter with a multi-pole active Bessel filter is preferred to use in pulsecode Modulator (PCM)/FM transmission. In the existing system, it is not possible to change the cut-off frequency for different data rates dynamically as required in the launch scenario of a long-range aerospace vehicle. In general, aerospace vehicle has multiple propellant stages to travel a desired trajectory path. Each stage gets separated from the vehicle at different instances. Each stage measurement plan is defined and correspondingly the PCM format is generated with an optimum data rate. Hence, the telemetry system is required to transmit variable data rates at various instances of a long-range aerospace vehicle from launch point to end point of a vehicle. This can be addressed by designing a dynamically tuneable pre-modulation (DTPM) filter. Here, a suitable DTPM filter scheme is proposed to mitigate variable data rate transmission in the telemetry system. The scheme is analysed as per IRIG-106 standard and simulated using MATLAB. The same has been modelled using VHDL and implemented targeting 28 nm technology Xilinx Zynq FPGA device.
Discrete Audio codecs (or audio tokenizers) have recently regained interest due to the ability of Large Language Models (LLMs) to learn their compressed acoustic representations. Various publicly available trainable d...
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