RESEARCH 1 MODULATION ANALOG AMPLITUDE MODULATION Modulation is the process of placing the information contained in a signal, usually low frequency, on a high frequency signal, the same that will pass certain modifications in one of its parameters, being said modification proportional to the amplitude of the low frequency signal called modulator, becoming the modulated signal. Modulation Analog Modulation Digital Modulation Analog Modulation Amplitude Modulation Frequency Modulation Phase Modulation AM FM PM Analog Amplitude Modulation Amplitude modulation is the process of changing the amplitude of a relatively high frequency carrier signal, in proportion to the instantaneous value of the modulating or modulating signal. Simulation BOMBÓN, H. O. (2007). Reubicación de frecuencias de Enlaces Microondas. Ambato. Claude, E. (2000). Modulación por frecuencia y por fase. Santiago: Universidad de Chile . Fernández, M. M. (2013). Universidad de Valladolid. Obtenido de http://www.profesaulosuna.com/data/files /TELECOMUNICACIONES/OSCILADORES/t ema3.pdf Frenzel, L. E. (2008). Sistemas Electrónicos de Comunicaciones. México: AlfaOmega. Gutierrez, F. H. (2019). Modulación y Demodulación de AM. Lima. Rodriguez, J. L. (25 de 08 de 2006). Modulación de Señales Digitales. Obtenido de http://www.dte.us.es/personal/sivianes/tcomu/L ibros%20y%20Apuntes/1995%20Modulacion%2 0digital.pdf Textos Cientificos. (30 de Julio de 2005). Obtenido de Textos Cientificos: https://www.textoscientificos.com/redes/modul acion Tomasi, W. (2003). Sistemas de Comunicaciones Electrónicas. Mexico: Pearson. Torrez, M. (30 de Agosto de 2011). Scribd. Obtenido de Scribd: https://es.scribd.com/doc/63546793/MODULACI ON-ANALOGICA SAMPLING THEOREM DEFINITION If a signal has its Fourier transform equal to 0 so that it is in a finite band of frequencies, which makes the samples that are taken close enough to each other relative to the highest frequency present in the signal, so that they will represent uniquely to the signal and we can reconstruct it perfectly , this whole process is called sampling theorem. THEOREM Be x(t) a limited band signal with X(jw)=0 for |w|>Wm. Then x (t) is determined univocaly by its samples: if Given these samples, we can reconstruct x(t) by generating a periodic pulse train, as well as amplitudes that correspond to successive sample values. APPLICATIONS DIGITAL OSCILLOSCOPES Instruments that allow to visualize and measure an electrical signal, digitizing the analog input signal DIGITAL AUDIO The digital audio sampling theorem is used because the signals that are received are digital signals, the same signals that are binary encoded. FERNANDEZ, J. G. (2019). EL TEOREMA DEL MUESTREO Y SUS APLICACIONES. SEVILLA: UNIVERSIDAD DE SEVILLA. GABRIEL RAMÍREZ, D. S. (2010). TEOREMA DEL MUESTREO. QUITO . COMMERCIAL INTEGRATED CIRCUITS FOR ANALOG SIGNAL DIGITIZATION ANALOG TO DIGITAL CONVERTER Analog-digital conversion devices convert an analog voltage level into a corresponding digital word. If n is the number of bits obtained from the word, this means that there will be 2^n different voltage levels PROCESS OF AN ANALOG-DIGITAL CONVERTER Analog signal sampling. Quantizing the signal itself Encoding the quantization result, in binary code.. TYPES OF THESE CONVERTERS: Stair ramp, Successive approximations, Parallel (flash), Double ramp, Voltage at frequency, Serial type. APPLICATIONS: The field of application is very wide so much that today most of our devices are formed with such a converter, and as a specific application is usually used for audio conversion systems. ADS7924: HUIRCÁN, J. I. (2007). CONVERSORES ANÁLOGO-DIGITAL Y DIGITAL-ANÁLOGO:. INSTRUMENTS, T. (2017). ADS7924 2.2 V, 12-BIT, 4-CHANNEL, MICROPOWER. DALLAS: TEXAS INSTRUMENTS INCORPORATED. PINZÓN ROSAS, ALBA JANETH. 2012. UNIVERSIDAD NACIONAL ABIERTA Y A DISTANCIA. JULIO DE 2012. HTTP://DATATECA.UNAD.EDU.CO/CONTENIDOS/401548/CONTENIDO_EN_LINEA/IN DEX.HTML. S.F. COMMERCIAL INTEGRATED CIRCUITS TO CONVERT DIGITAL SIGNALS INTO ANALOG DIGITAL-ANALOG CONVERTER DAC is the process of transforming a digital signal that is going to be the input signal, into an analog signal that will be the output signal of this circuit. Being very important because, in digital systems, the response that we will always have will be given in binary form and for it to have a performance in the external environment, you have to take these responses to an analog signal mode. DIGITAL-ANALOG CONVERTER CAN BE IN: SERIES OR PARALLEL APLICATION At the time this type of DAC is integrated into a processing card, we will have the application of them mainly in the audio conversion to be carried to hearing aids or speakers, and we find them in the following presentation: ONE OF THE MOST COMMERCIAL IS THE DAC0808 FOR THE IMPLEMENTATION OF INTEGRATED CIRCUITS. Instruments, T. (1999). DAC0808. Dallas: Texas Instruments Incorpored. Paredes-Martínez, E., Niño de Rivera y O., L., & Cruz-Irisson, M. (2008). Convertidor digital a analógico de un bit. Mexico: Cientifica. Yacambu, U. (2018). Circuitos Electrónicos DAC y ADC. Yacumbu .
