In this paper, a system based model of Pulse code modulation (PCM) has been constructed for
voice frequencies. In this, a sample and hold circuit has been constructed that uses a triggering semiconductor
switch like MOSFET that samples the voice signals at a frequency of 8 KHz. The sampling is based upon the
Nyquist criteria. An ADC circuit is implemented to quantize and digitize the output of the sample and Hold circuit.
The outputs that are obtained are converted into 8-bit digital value per sample at a frequency of 8 KHz. Pulse
Code Modulation (PCM) is the most straightforward type of waveform coding among other change forms as like
Adaptive Pulse Code Modulation (APCM), Delta Modulation Lastly, a parallel to serial converter is designed at
an accurate time without any delay. Further an 8-bit shifting register along with decade counter and flip-flops are
provided to this waveform sequentially without delay
ADC, Decade counter, Flip-Flop, PCM, Sample, Hold circuit.
Controllable synthesis of uniform large-sized spherical covalent organic frameworks for facile sample pretreatment and as naked-eye indicator.
Li W, Wang R, Jiang HX, Chen Y, Tang AN, Kong DM
Talanta. 2022; 236(): 122829
Review of the Use of Liquid Chromatography-Tandem Mass Spectrometry in Clinical Laboratories: Part I-Development.
Annals of laboratory medicine. 2022; 42(2): 121-140
A biomolecule-free electrochemical sensing approach based on a novel electrode modification technique: Detection of ultra-low concentration of Īā¹-tetrahydrocannabinol in saliva by turning a sample analyte into a sensor analyte.
Ortega GA, Ahmed SR, Tuteja SK, Srinivasan S, Rajabzadeh AR
Talanta. 2022; 236(): 122863
New designs of paper based analytical devices (PADs) for completing replication analysis of a sample within a single run by employing smartphone.
Kiwfo K, Woi PM, Seanjum C, Grudpan K
Talanta. 2022; 236(): 122848
Invasive Electrophysiology for Circuit Discovery and Study of Comorbid Psychiatric Disorders in Patients With Epilepsy: Challenges, Opportunities, and Novel Technologies.
Balzekas I, Sladky V, Nejedly P, Brinkmann BH, Crepeau D, Mivalt F, Gregg NM, Pal Attia T, Marks VS, Wheeler L, Riccelli TE, Staab JP, Lundstrom BN, Miller KJ, Van Gompel J, Kremen V, Croarkin PE, Worrell GA
Frontiers in human neuroscience. 2021; 15(): 702605