【 Weak current College 】 audio equipment and system knowledge (2)

51. compressor GateThreshold significance threshold for compression

52. the compressor has the "breathing space" effect may be due to the recovery time too short

53. compressor appear unnatural "tone head increase" is usually due excessively long boot time

54. the professional audio and home audio system in combination with the main difference is that the more the sound mixer

55. the impact sound system replay sound quality is good or bad is speaker of key equipment

56. the audio tones in the onsite show yinyuan actions most frequently tuning device is a sound mixer

57. the audio system for acoustic debug, such as producing howl when adjusting the equalizer

58. the audio system to avoid speakers and amplifier overload of major equipment is compression device

59. in addition to the speaker, the sound quality to show the effect of the larger equipment is the microphone

60. professional audio systems most easily damaged device is speaker

61. a professional audio system efficiency is the lowest equipment box

62. professional audio system, distortion rate maximum device is a speaker

63. the professional audio system, the power consumption of the device is a maximum power amplifier

64. the audio system, the electrical energy is converted into sound energy device is a speaker

65. the audio system, the sound energy into electrical energy of the device is a microphone

66. the sound system, able to drive the speaker device is power amplifier

67. the audio system, the technology mature, the technological index maximum device is power amplifier

68. The preamplifier and power amplifier is the predecessor of the main Division is responsible for zoom in and control, power amplifier for Zoom

69. the accurate measurement of professional power amplifier output power indicator is the maximum output power without distortion

70. DB represents the amplifier power gain formula is 10lg (output/input power)

71. the professional recording system mainly includes radio and TV stations, film studios, audio-visual company Studio equipment

72. professional auditorium sound amplifying system mainly includes Hall, Conference Hall, theater, and dance halls of audio equipment

73. public broadcasting system including restaurants, shopping malls, hotels, parks of background sound and fire radio

74. recording deck, opening the recorder voice records belong to the magnetic recording

75. film copies of sound recordings are optical recording

76.CD, LD, DVD sound record belongs to the laser digital recording

77.LP dense pattern recording voice records belong to the mechanical recording

78. harmonic distortion factor is defined as the sum of squares of harmonic voltage RMS square wave voltage divided by the matrix of valid values

79. the power amplifier damping coefficient DF is equal to the rated load impedance and the output resistance ratio

80. the power amplifier, the greater the damping coefficient, the speaker resonance suppression capability

81. General power amplifier of damping coefficient values to select 15 ~ 100

82. The preamplifier PHONOIN input matching requirements as input 1 ~ 10mV, RIAA equalization networks

83. The preamplifier MICIN input matching requirements as input 1 ~ 10mV, straight balanced characteristics

84. The preamplifier TAPEIN input matching requirements to enter 0.5 ~ 2V, straight balanced characteristics

85. The preamplifier CDIN input matching requirements to enter 0.5 ~ 2V, straight balanced characteristics

86. The preamplifier input matches the requirements of AUXIN as input 0.5 ~ 2V, straight balanced characteristics

87. The preamplifier TUNERIN input matching requirements to enter 0.5 ~ 2V, straight balanced characteristics

88. The preamplifier input matching requirements LINEIN to enter 0.5 ~ 2V, straight balanced characteristics

89. The preamplifier in Loudness function is loudness control, with the amplifier's volume to signal of high hour bass to compensation

90. The preamplifier features in Volume is the volume control to change the size of the gain of amplifier

91. The preamplifier Treble\Bass function is in the tone control, change the ratio of the treble, the Bass Amplifier

92. The preamplifier features in Balance is the balance control, adjust the left and right channels of a stereo amplifier relative volume output

93. amplifier HPF circuit's main function is the high-pass filter to filter out low frequency noise 100Hz following

94. the amplifier in the main features of LPF circuit is low-pass filter to filter out high frequency noise 5KHZ above

95. amplifier LOW CUT circuit's main function is the high-pass filter to filter out low frequency noise 100HZ following

96. amplifier HIGH CUT circuit is low pass filter to filter out high frequency noise 5KHZ above

97.OTL circuit output power of formula is (voltage) 2/8X load resistance

98.OCL circuit output power of formula is (voltage) 2/2X load resistance

99.BTL circuit output power of formula is (voltage) 2/load resistance

100.OCL circuit to eliminate switch machine instant impact on the speakers, the approach is to delay switching relayFor