Programación y Simulación Avanzada L110
Tema: 9 Procesam Pro cesamient iento o de señales con MatL MatLab ab
Ing. José Jos é C. Benítez P.
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Índice Proces Pro cesam amien iento to de Señale Señaless con Mat MatLab Lab I
Objetivo Ejercicios Tarea
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Objetivos
El alumno debe demostrar destreza en la adquisición señales de audio audio en Matlab Matlab de distinto distintoss tipos tipos de señales para poder almacenarlas, almacenarlas, leerlas,, leerlas,, reproducirlas, reproducirlas, procesarlas y mostrar sus características . A ina ina izar izar e a umno umno de e demo demosstrar trar capa capaci cida dad d par para armónicas de las hallar y mostrar las componentes armónicas señales de audio .
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Ejercicios Procesamiento Procesam iento de señales de audio con MatLab 1.
Captura Captura de las señales de audio en MatLab:
Para capturar una señal de audio por la entrada MIC (micrófono) del computad computador or,, MatLab MatLab cuenta cuenta con la función función wavrecord(t*Fs,Fs,Ch) t es el tiem tiem o en en se se undo undoss de de ca ca tur tura de de la la se señal ñal Fs es la frecuencia de muestreo muestreo (8000, 11025, 22050 y 44100)
estéreo). Ch es el tipo de canal (1: mono y 2: estéreo). Al capturar asignarle a una variable para su posterior procesamiento. procesamiento. Ejemplo:
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Ejercicios 2.
Guardar las señales señales de audio en MatLab:
Para guardar una señal capturada en formato WAV se usa la función: wavwrite(y,Fs,NBits,'Nombre.wav') ; y es la variable variable que contien contiene e el archivo archivo WA WAV Fs es la frecuencia de muestreo, NBits el número de bits (8, 16, 24 o 32) y Nombre.wav es el nombre del archivo en el que se grabará grabará el sonido.
Observaciones: - Los valor valores es de ampli amplitud tud que que est estén én fuer fuera a del del rango rango [-1,+1] [-1,+1] son clipeados. - Si no no se espe especi cifi fica can n los los NBit NBitss el pr progra ograma ma asu asume me por por def defec ecto to 16 16 Bits Bits.. Si n e de min , el def
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Ejercicios 3.
Leer las señales de audio desde un archivo WAV en MatLab:
Para leer un archivo de sonido almacenado en formato WAV se utiliza el comando: z = wavread(‘sonido_uno.wav‘);
Se debe asignar a una variable vectorial para su procesamiento procesamiento posterior.
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Ejercicios 4.
Reproducir las señales de audio desde una variable vectorial en MatLab:
Para reproducir un archivo de sonido almacenado en una variable vectorial se utiliza el comando: sound(z);
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Ejercicios 5.
Información Información sobre las señales señales de audio en formato formato WA WAV en MatLab:
Para conocer los datos de un archivo en formato WAV: [y,Fs,NBits] = wavread('file.wav');
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Ejercicios 6.
Cortando las señales señales de audio en formato formato WAV en MatLab: MatLab:
Para leer las primeras Num muestras del archivo: [n]=wavread('file.wav',Num)
muestras que se desean tomar del archivo. Num es la cantidad de muestras
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Ejercicios 7.
Tamaño amaño y dimensión dimensión vectoria vectoriall de las señales señales de audio en forma fo rmato to WA WAV en MatLa MatLab: b: length(v)
reto retorna rna 42860 42860
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Ejercicios 8.
Gráfico espectral de señales:
Capturar los sonidos del violín y de la flauta utilizando en comando wavwrit wavwrite e en los archivos archivos violin.wav y flauta. flauta.wav wav respectivamente. Leer los archivos violin.wav flauta. en las variables vectoriale
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Ejemplo
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Ejercicios
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Ejercicios
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Tarea
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