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The 5.1 channel sound is used primarily for theatrical films on pay-per-view channels and at theaters. For this reason, many DTV programs use two-channel sound. Most television facilities are not equipped to produce 5.1 channel sound. cable television industry has also adopted Dolby Digital for DTV applications. The Advanced Television Systems Committee ( ATSC) selected Dolby Digital as a standard for DTV because of its popularity with film producers and consumers, its ability to use a single audio streaming video because of the downmixing feature, and its high quality sound. Because the playback device does the downmixing, producers do not have to create multiple audio signals for each playback device.
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The playback device's decoder downmixes the 5.1 channel signal to a mono signal allowing the television to use the received audio signal. For example, a 5.1 channel audio signal is delivered to a mono television. The decoder in the playback device delivers the audio signal specific to that particular device's ability.
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This multichannel scheme is known as 5.1 channel.īecause not everyone has the equipment needed to take advantage of Dolby Digital's 5.1 channel sound, developers included a downmixing feature that ensures compatibility with any playback device. The LFE channel is one-tenth of the bandwidth of the other channels and is sometimes erroneously called the subwoofer channel. A low frequency effect (LFE) channel is included that provides the sound needed for special effects and action sequences in movies. The European DVB standard does not use Dolby Digital for audio, but instead uses MPEG standard technology for both the audio and video signals.ĭolby Digital provides five full-bandwidth channels, front left, front right, center, surround left, and surround right, for true surround sound quality. It has been selected as the audio standard for digital television ( DTV). Dolby Digital is used with digital versatile discs (DVDs), high definition television (HDTV), and digital cable and satellite transmissions. By reducing, eliminating, or masking the noise, the amount of data is reduced to one tenth of the data on a compact disk (CD). Sometimes the coding noise is not in the same frequency of an audio signal and must be reduced or eliminated. When coding noise is close to the frequency of an audio signal, that audio signal masks the noise so that the human ear hears only the intended audio signal. Dolby Digital takes advantage of how the human ear processes sound. Can i use Reclock with DVBViewer to solve this? What i have to do to use Reclock with DVBViewer?Ĥ.Dolby Digital, formerly known as AC-3, is a digital audio coding technique that reduces the amount of data needed to produce high quality sound. I think it could be because 60 is not a multiple of 25 and it is necessary to repeat some frames to complete from 50 to 60 (i think that it is called judder effect).ġ.-Is this freezing effect due to judder effect?Ģ.-Is DVBViewer affected by judder effect?ģ.-I think that Reclock fits frames per second to monitor frequency to solve judder effect. I see, above all in live-tv football transmisions, an annoying effect like freezing picture. In PC, i have a monitor frequency of 60 KHZ (I can select 60, but not 50 because it is not a allowed mode).
Ac3 filter necessary Pc#
I have my PC with DVBViewer connected to a 42" plasma TV through PC connector (VGA). My questions are about frames per second of transmitted television.
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In DVBViewer you can see, in the bottom status bar, the resolution in pixels and the number of frames per second (fps) of the transmitted television picture, followed by the bitrate of the audio signal (kbps, k-bit per second) and the sampling rate in kilohertz.