I have an LCD TV with a built in DVD player. Why do I have to turn up the volume when I use the DVD player, versus the TV?
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Anonymous
ANSWERS: 1
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The two signal sources - television and DVD player - do not necessarily carry audio signals that are scaled to the same audio level. Many DVDs have a lower mean audio volume level when compared to off-air or off-cable television signals. Broadcasters compress the audio signal to avoid overloading the audio amplifier and speakers in a television. Film soundtracks on DVDs invariably include transients and a much wider dynamic range. The intent is to recreate the sensation of a cinema soundtrack in your home, using a moderately powerful surround sound system. Such an audio signal is not usually found in television broadcasts, where the audio portion of the signal is compressed to reduce the signal dynamics. Compression also increases the average volume level. The piddly little amplifiers and speakers found in most televisions cannot handle a wide dynamic range or transients very well, so the broadcasters compress the audio signals. Radio broadcasters do the same, although they really don't have to with FM broadcasts.
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