After Alexander Graham Bell invented the telephone, and telephone lines began to be stung up all over, the Bel, spelled Bel, was the loss of signal strength in one mile of telephone line. A decibel then, is one tenth of that. A microphone output is generally in the range of -65 to -85 dB. Line level, the signal level that audio devices operate is typically +4 dB for professional gear, like recording consoles, digital audio workstations, tape recorders, and outboard signal processors. For consumer gear like TVs, CD and DVD players. the line level is -10 dB, 14 dB lower. Generally any analog input or output that uses an RCA or phono connector is at the -10 dB level. Although a 14 difference between professional and consumer line level may not seem like that much, remember that an increase of only 6dB doubles the volume.
Monday, November 26, 2012
The Decibel
The Decibel Tube. Duration : 1.28 Mins.
After Alexander Graham Bell invented the telephone, and telephone lines began to be stung up all over, the Bel, spelled Bel, was the loss of signal strength in one mile of telephone line. A decibel then, is one tenth of that. A microphone output is generally in the range of -65 to -85 dB. Line level, the signal level that audio devices operate is typically +4 dB for professional gear, like recording consoles, digital audio workstations, tape recorders, and outboard signal processors. For consumer gear like TVs, CD and DVD players. the line level is -10 dB, 14 dB lower. Generally any analog input or output that uses an RCA or phono connector is at the -10 dB level. Although a 14 difference between professional and consumer line level may not seem like that much, remember that an increase of only 6dB doubles the volume.
After Alexander Graham Bell invented the telephone, and telephone lines began to be stung up all over, the Bel, spelled Bel, was the loss of signal strength in one mile of telephone line. A decibel then, is one tenth of that. A microphone output is generally in the range of -65 to -85 dB. Line level, the signal level that audio devices operate is typically +4 dB for professional gear, like recording consoles, digital audio workstations, tape recorders, and outboard signal processors. For consumer gear like TVs, CD and DVD players. the line level is -10 dB, 14 dB lower. Generally any analog input or output that uses an RCA or phono connector is at the -10 dB level. Although a 14 difference between professional and consumer line level may not seem like that much, remember that an increase of only 6dB doubles the volume.
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