834 resultados para Television bandwidth compression


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This paper initially identifies the main transformations of the television system that are caused by digitalization. Its development in several broadcasting platforms is analyzed as well as the particular obstacles and requirements that are detected for each of them. Due to its technical characteristics and its historical link to the public services, the terrestrial network requires migration strategies different from those strictly commercial, and public intervention might be needed. The paper focuses on such migration strategies towards DTT and identifies the main issues for public intervention in the areas of the digital scenario: technology, business and market transformation and the reception field. Moreover, it describes and classifies the challenges that public broadcasters should confront due to digitalization. This paper finally concludes that the leadership of the public broadcasters during the migration towards DTT is an interesting tool for public policy. The need for foster the digitalization of the terrestrial platform and to achieve certain social and public goal besides the market interest brings an opportunity for public institutions and public broadcasters to work together. That leading role could also be positive for the public service to face its necessary redefinition and reallocation within the digital context.

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In the context of fading channels it is well established that, with a constrained transmit power, the bit rates achievable by signals that are not peaky vanish as the bandwidth grows without bound. Stepping back from the limit, we characterize the highest bit rate achievable by such non-peaky signals and the approximate bandwidth where that apex occurs. As it turns out, the gap between the highest rate achievable without peakedness and the infinite-bandwidth capacity (with unconstrained peakedness) is small for virtually all settings of interest to wireless communications. Thus, although strictly achieving capacity in wideband fading channels does require signal peakedness, bit rates not far from capacity can be achieved with conventional signaling formats that do not exhibit the serious practical drawbacks associated with peakedness. In addition, we show that the asymptotic decay of bit rate in the absence of peakedness usually takes hold at bandwidths so large that wideband fading models are called into question. Rather, ultrawideband models ought to be used.

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Agency Performance Report

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Agency Performance Report

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Tässä opinnäytetyössä käsittelen tavallisia ihmisiä televisiouutisten jutuissa käyttäen esimerkkeinä uutisjuttuja Nelosen ja MTV3:n kotimaan uutisista. Tavoitteeni on tutkia tavallisen ihmisen rooleja ja tehtäviä television uutisjutuissa, sekä tarkastella ”rivikansalaisten” käyttämistä uutisjutuissa toimittajantyön kannalta. Valotan sitä, mitä MTV3 ja Nelonen uutisillaan tavoittelevat, millaisista lähtökohdista kanavat toimivat ja miten kanavien arvot vaikuttavat tavallisten ihmisen esiintymiseen uutisjutuissa. Esittelen ja analysoin erilaisia juttutyyppejä, joissa tavallisia ihmisiä uutisissa esiintyy, pohdin millaisia tarinoita ja sisältöjä heidän kannaltaan kerrotaan ja millaisissa rooleissa he esiintyvät. Pohdin myös sitä, mitä lisäarvoa tavallisilla ihmisillä uutisjuttuihin haetaan ja sitä, voisiko arjen näkökulmaa laajentaa niistä juttutyypeistä, joissa se nyt jo esiintyy. Tarkastelen omien kokemuksieni pohjalta myös, millaisia käytännöllisiä, moraalisia ja journalistisia pulmia ja mahdollisuuksia tavallisten ihmisten käyttämiseen television uutisjutuissa liittyy. Käsittelen myös sitä, mihin tavalliset ihmiset asettuvat uutisten hierarkiassa, ja miten heidän esiintymisensä uutisjutuissa vaikuttaa uutisen objektiivisuuteen. Tavallinen ihminen on uutisjutussa elävöittävä kokija, toimija tai passiivinen toiminnan kohde. Hän voi esiintyä lähes minkä tahansa tyyppisessä uutisjutussa kuvittajana, kommentoijana, uutiskuorman keventäjänä tai jutulle rakenteen antavana tapauksena. Tavalliset ihmiset esiintyvät televisiouutisten gallupeissa tai avaamassa keskustelunaiheita elämäntilanteellaan. Usein he esiintyvät toimittajan tai toimituksen alter egoina, ottavat kantaa asioihin vapaina uutishuoneen objektiivisen totuuden oletusarvosta. Televisio on arkinen, perhekeskeinen ja tasa-arvoinen väline, joka joutuu taistelemaan huomiosta kodin muiden tapahtumien kanssa. Viihtymisen kannalta on olennaista kuvata ihmiskasvoja, tehdä uutisista tarinoita ja tarjota samaistuttavia elementtejä katsojalle. Vaikka monet tutkijat sijoittavat tavallisen ihmisen uutishierarkian alimmalle portaalle, heillä on uutisjutuissa viihdyttäjän osan ohella tärkeä tehtävä totuudenpuhujina.

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OBJECTIVES: To preliminarily evaluate prospectively the accuracy and reliability of a specific ad hoc reduction-compression forceps in intraoral open reduction of transverse and displaced mandibular angle fractures. STUDY DESIGN: We analyzed the clinical and radiologic data of 7 patients with 7 single transverse and displaced angle fractures. An intraoral approach was performed in all of the patients without using perioperative intermaxillary fixation. A single Arbeitsgemeinschaft Osteosynthese (AO) unilock reconstruction plate was fixed to each stable fragment with 3 locking screws (2.0 mm in 5 patients and 2.4 mm in 2 patients) at the basilar border of the mandible, according to AO/American Society of Internal Fixation (ASIF) principles. Follow-up was at 1, 3, 6, and 12 months, and we noted the status of healing and complications, if any. RESULTS: All of the patients had satisfactory fracture reduction as well as a successful treatment outcome without complications. CONCLUSION: This preliminary study demonstrated that the intraoral reduction of transverse and displaced angle fractures using a specific ad hoc reduction-forceps results in a high rate of success.

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Annual Report, Agency Performance Plan

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Transitional cell carcinoma of the urinary bladder is a malignancy that metastasizes frequently to lymph nodes including the mediastinal lymph nodes. This occurrence may produce symptoms due to compression of adjacent structures such as the superior vena cava syndrome or dysphagia from esophageal compression. We report the case of a 59-year-old man with metastatic transitional cell carcinoma for whom mediastinal lymphadenopathy led to pulmonary artery compression and a rapidly fatal outcome. This rare occurrence has to be distinguished from pulmonary embolism, a much more frequent event in cancer patients, in order that proper and prompt treatment be initiated.

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Puhe

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Audit report on Iowa Public Television for the year ended June 30, 2007