Señales y sistemas /

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Detalles Bibliográficos
Autor Principal:	Oppenheim, Alan V.
Otros autores o Colaboradores:	Willsky, Alan S., Nawad, S. Hamid
Formato:	Libro
Lengua:	español
Datos de publicación:	México : Pearson, 1998.
Edición:	2a ed.
Temas:	SEÑALES SISTEMAS FILTRADO MODULACION RETROALIMENTACION SISTEMAS LINEALES ANALISIS DE FOURIER MUESTREO TRANSFORMADA DE LAPLACE TRANSFORMADA Z
Descripción Física:	xxx, 956 p. : il. ; figuras
ISBN:	970170116X

Tabla de Contenidos:

Señales y sistemas - Sistemas lineales invariantes en el tiempo - Representación de señales periódicas en series de Fourier - La transformada continua de Fourier - La transformada de Fourier en tiempo discreto - Caracterización en tiempo y frecuencia de señales y sistemas - Muestreo - Sistemas de comunicación - La transformada de Laplace - La transformada Z - Sistemas lineales retroalimentados - Apéndice.

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// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return true; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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