By keeping Directv I saved $120 and was given $200 plus a $20 credit. Here is how I look at it. My service for the next year will cost $768, but I can subtract out the $120 ETF, $200 Visa card and the $20 credit meaning my cost is $428 for 12 months or about $35.66 per month.ere is how I look at it. My service for the next year will cost $768, but I can subtract out the $120 ETF, $200 Visa card and the $20 credit meaning my cost is $428 for 12 months or about $35.66 per month.
See reference 1 for a scale of dB intensities. Conversation is listed at ~60 dB. normal talking is usually between 50-60 dB and yelling can be up around 80 dB's. Voice Decibel. dB is a measure of relative magnitude. dBA is a measure of sound volume relative to a reference audio level.
The decibel (dB) is used to measure sound level, but it is also widely used in electronics, signals and communication. The dB is a logarithmic way of dscribing a ratio. The ratio may be power, sound pressure, voltage or intensity or several other things.Later on we relate dB to the phon and the sone (related to loudness). But first, to get a taste for logarithmic expressions, let's look at some numbers.Note also the factor 10 in the definition, which puts the 'deci' in decibel). Sound pressure, sound level and dB. Sound is usually measured with microphones and they respond (approximately) proportionally to the sound pressure, p. Now the power in a sound wave, all else equal, goes as the square of the pressure.