Cancellation of siren noise from two-way voice communication inside emergency vehicles

The development of an adaptive filter system, capable of reducing significantly the effect of siren noise within the cab of an emergency vehicle, is described. The system is capable of removing the siren noise picked up by the radio microphone inside the vehicle, without degrading the wanted voice signal, thus allowing the siren to be used at all times.

The application of affine projection to the development of a siren noise cancellation system

Emergency vehicles use high-amplitude sirens to warn pedestrians and other road users of their presence. Unfortunately, the siren noise enters the vehicle and corrupts the intelligibility of two-way radio voice com-munications from the emergency vehicle to a control room. Often the siren has to be turned off to enable the control room to hear what is being said which subsequently endangers people's lives. A digital signal processing (DSP) based system for the cancellation of siren noise embedded within speech is presented. The system has been tested with the least mean square (LMS), normalised least mean square (NLMS) and affine projection algorithm (APA) using recordings from three common types of sirens (two-tone, wail and yelp) from actual test vehicles. It was found that the APA with a projection order of 2 gives comparably improved cancellation over the LMS and NLMS with only a moderate increase in algorithm complexity and code size. Therefore, this siren noise cancellation system using the APA offers an improvement in cancellation achieved by previous systems. The removal of the siren noise improves the response time for the emergency vehicle and thus the system can contribute to saving lives. The system also allows voice communication to take place even when the siren is on and as such the vehicle offers less risk of danger when moving at high speeds in heavy traffic.

Batsʻatrutʻiwn chʻapʻutsʻ ew kshṛotsʻ nakhneatsʻ : aṛajnordutʻeamb Epipʻanu, Khorenatsʻwoy ew Shirakatsʻwoy /

Haṛajabanutʻiwn -- Epiphaniou Peri metrōn kai stathmōn = Epipʻanu Haghags chʻaputsʻ ew kshṛotsʻ -- Anania Shirakunoy hamaroghi Haghags kshṛotsʻn ew chʻapʻutsʻ -- Movsisi Khorenatsʻwoy Haghags asparisakan chʻapʻu -- Haghags ěntʻatsʻitsʻ aregakan ew hamaroy chʻapʻutsʻ ěst krkin ōrinakatsʻ Shirakatsʻwoyn -- Batsʻatrutʻiwn chʻapʻuts ew kshṛotsʻ nakhneatsʻ -- Ard i chʻapʻkʻ ew kshiṛkʻ Gaghghiatsʻwotsʻ -- Aṛandzin dasakargutʻiwn kshṛotsʻ ew chʻapʻutsʻ handerdz tachkakan baṛiwkʻ.

The Siren Vase, Side A, The Ship of Odysseus passing the Sirens

Siren Painter, attributed to; H: 1 ft. 2 in.; stamnos, red figure, paintied pottery

The Siren Vase, Side A, The Ship of Odysseus passing the Sirens: detail of ship

Siren Painter, attributed to; H: 1 ft. 2 in.; stamnos, red figure, paintied pottery

El rol de las redes de apoyo transnacional en la evolución del régimen de trata de personas en la región del mekong, 2004-2015

Con el fin de la unipolaridad no sólo se fortalecieron mecanismos de gobernanza global como los Regímenes Internacionales, sino también se fortalecieron actores no estatales. A pesar de la importancia que tomaron estos dos elementos aún no existe una teoría que explique exhaustivamente la relación que existe entre ellos. Es por lo anterior que, la investigación busca responder de qué manera el rol de las Redes de Apoyo Transnacional ha incidido en la evolución del régimen de tráfico de personas en la Región del Mekong. Asimismo tiene como objetivo comprender las relación entre el Régimen y las Redes de Apoyo Transnacional a través de la formulación de un caso de estudio basado en metodologías cualitativas, específicamente, en el análisis teórico-constructivista y el análisis de contenido de documentos producidos por actores estatales y no estatales.