The actual loudness of the sound and the actual loudness of the human ear are not completely linear. At a small volume, the human ear has a physiological attenuation of the middle and high frequency hearing. The smaller the volume, the more obvious the attenuation.
In order to maintain the equal loudness effect of high and low frequency hearing when the human ear is relatively loud at a small volume, some preamplifiers insert an equal loudness effect circuit, the principle is to appropriately increase the amplification ratio of the middle and high frequency bands at a small volume, reaching the person The consistency of the ear hearing.
Each person's equal loudness curve is different, and the equal loudness characteristics of different people can be balanced, and the equal loudness curve under different loudness of human beings can be roughly obtained.
The equal loudness control circuit is divided into two types in principle. One is a circuit that fixes the equal loudness control amount. It is relatively simple. This circuit is generally provided with an equal loudness switch. When necessary, the equal loudness switch is pressed. There is also an advanced linear equal loudness control circuit. With the volume, the amount of equal loudness compensation will change to achieve the most linear effect. Such a circuit often has no equal loudness switch and is linearly controlled by the volume potentiometer.
Technically, it is divided into a loudness control circuit such as an analog circuit and a loudness control circuit such as a digital circuit. The digital equal loudness controller can select several different equal loudness curves and achieve full linear control.
The equal loudness control circuit will increase the distortion and degrade the signal-to-noise ratio. Therefore, it is generally used in car audio and popular amplifiers. High-end amplifiers and professional amplifiers do not have equal loudness control circuits. The actual loudness of the sound and the actual loudness of the human ear are not completely linear. At a small volume, the human ear has a physiological attenuation of the middle and high frequency hearing. The smaller the volume, the more obvious the attenuation.
In order to maintain the equal loudness effect of high and low frequency hearing when the human ear is relatively loud at a small volume, some preamplifiers insert an equal loudness effect circuit, the principle is to appropriately increase the amplification ratio of the middle and high frequency bands at a small volume, reaching the person The consistency of the ear hearing.
Each person's equal loudness curve is different, and the equal loudness characteristics of different people can be balanced, and the equal loudness curve under different loudness of human beings can be roughly obtained.
The equal loudness control circuit is divided into two types in principle. One is a circuit that fixes the equal loudness control amount. It is relatively simple. This circuit is generally provided with an equal loudness switch. When necessary, the equal loudness switch is pressed. There is also an advanced linear equal loudness control circuit. With the volume, the amount of equal loudness compensation will change to achieve the most linear effect. Such a circuit often has no equal loudness switch and is linearly controlled by the volume potentiometer.
Technically, it is divided into a loudness control circuit such as an analog circuit and a loudness control circuit such as a digital circuit. The digital equal loudness controller can select several different equal loudness curves and achieve full linear control.
The equal loudness control circuit will increase the distortion and degrade the signal-to-noise ratio. Therefore, it is generally used in car audio and popular amplifiers. High-end amplifiers and professional amplifiers do not have equal loudness control circuits. The actual loudness of the sound and the actual loudness of the human ear are not completely linear. At a small volume, the human ear has a physiological attenuation of the middle and high frequency hearing. The smaller the volume, the more obvious the attenuation.
In order to maintain the equal loudness effect of high and low frequency hearing when the human ear is relatively loud at a small volume, some preamplifiers insert an equal loudness effect circuit, the principle is to appropriately increase the amplification ratio of the middle and high frequency bands at a small volume, reaching the person The consistency of the ear hearing.
Each person's equal loudness curve is different, and the equal loudness characteristics of different people can be balanced, and the equal loudness curve under different loudness of human beings can be roughly obtained.
The equal loudness control circuit is divided into two types in principle. One is a circuit that fixes the equal loudness control amount. It is relatively simple. This circuit is generally provided with an equal loudness switch. When necessary, the equal loudness switch is pressed. There is also an advanced linear equal loudness control circuit. With the volume, the amount of equal loudness compensation will change to achieve the most linear effect. Such a circuit often has no equal loudness switch and is linearly controlled by the volume potentiometer.
Technically, it is divided into a loudness control circuit such as an analog circuit and a loudness control circuit such as a digital circuit. The digital equal loudness controller can select several different equal loudness curves and achieve full linear control.
The equal loudness control circuit will increase the distortion and degrade the signal-to-noise ratio. Therefore, it is generally used in car audio and popular amplifiers. High-end amplifiers and professional amplifiers do not have equal loudness control circuits.
The concept of Passive Optical Network (PON) has a long history. It has the characteristics of saving optical fiber resources and being transparent to network protocols, and it plays an increasingly important role in optical access networks. At the same time, after two decades of development, Ethernet technology has almost completely dominated the local area network with its simple, practical, and low-cost characteristics, and has in fact proved to be the best carrier for carrying IP data packets. As the proportion of IP services in metro and trunk transmission continues to rise, Ethernet is also gradually penetrating access, metro and even backbone networks through improvements in transmission rate and manageability. The combination of Ethernet and PON resulted in the Ethernet Passive Optical Network (EPON). It has the advantages of Ethernet and PON at the same time, and is becoming a popular technology in the field of optical access networks.
EPON is a kind of emerging broadband access technology. It realizes the integrated service access of data, voice and video through a single optical fiber access system, and has good economic efficiency. The industry generally believes that FTTH is the ultimate solution for broadband access, and EPON will also become a mainstream broadband access technology. Due to the characteristics of the EPON network structure, the special advantages of broadband access to the home, and the natural organic combination with the computer network, experts all over the world agree that passive optical network is the realization of "three networks in one" and the solution to the information highway The best transmission medium for the "last mile".
In order to maintain the equal loudness effect of high and low frequency hearing when the human ear is relatively loud at a small volume, some preamplifiers insert an equal loudness effect circuit, the principle is to appropriately increase the amplification ratio of the middle and high frequency bands at a small volume, reaching the person The consistency of the ear hearing.
Each person's equal loudness curve is different, and the equal loudness characteristics of different people can be balanced, and the equal loudness curve under different loudness of human beings can be roughly obtained.
The equal loudness control circuit is divided into two types in principle. One is a circuit that fixes the equal loudness control amount. It is relatively simple. This circuit is generally provided with an equal loudness switch. When necessary, the equal loudness switch is pressed. There is also an advanced linear equal loudness control circuit. With the volume, the amount of equal loudness compensation will change to achieve the most linear effect. Such a circuit often has no equal loudness switch and is linearly controlled by the volume potentiometer.
Technically, it is divided into a loudness control circuit such as an analog circuit and a loudness control circuit such as a digital circuit. The digital equal loudness controller can select several different equal loudness curves and achieve full linear control.
The equal loudness control circuit will increase the distortion and degrade the signal-to-noise ratio. Therefore, it is generally used in car audio and popular amplifiers. High-end amplifiers and professional amplifiers do not have equal loudness control circuits. The actual loudness of the sound and the actual loudness of the human ear are not completely linear. At a small volume, the human ear has a physiological attenuation of the middle and high frequency hearing. The smaller the volume, the more obvious the attenuation.
In order to maintain the equal loudness effect of high and low frequency hearing when the human ear is relatively loud at a small volume, some preamplifiers insert an equal loudness effect circuit, the principle is to appropriately increase the amplification ratio of the middle and high frequency bands at a small volume, reaching the person The consistency of the ear hearing.
Each person's equal loudness curve is different, and the equal loudness characteristics of different people can be balanced, and the equal loudness curve under different loudness of human beings can be roughly obtained.
The equal loudness control circuit is divided into two types in principle. One is a circuit that fixes the equal loudness control amount. It is relatively simple. This circuit is generally provided with an equal loudness switch. When necessary, the equal loudness switch is pressed. There is also an advanced linear equal loudness control circuit. With the volume, the amount of equal loudness compensation will change to achieve the most linear effect. Such a circuit often has no equal loudness switch and is linearly controlled by the volume potentiometer.
Technically, it is divided into a loudness control circuit such as an analog circuit and a loudness control circuit such as a digital circuit. The digital equal loudness controller can select several different equal loudness curves and achieve full linear control.
The equal loudness control circuit will increase the distortion and degrade the signal-to-noise ratio. Therefore, it is generally used in car audio and popular amplifiers. High-end amplifiers and professional amplifiers do not have equal loudness control circuits. The actual loudness of the sound and the actual loudness of the human ear are not completely linear. At a small volume, the human ear has a physiological attenuation of the middle and high frequency hearing. The smaller the volume, the more obvious the attenuation.
In order to maintain the equal loudness effect of high and low frequency hearing when the human ear is relatively loud at a small volume, some preamplifiers insert an equal loudness effect circuit, the principle is to appropriately increase the amplification ratio of the middle and high frequency bands at a small volume, reaching the person The consistency of the ear hearing.
Each person's equal loudness curve is different, and the equal loudness characteristics of different people can be balanced, and the equal loudness curve under different loudness of human beings can be roughly obtained.
The equal loudness control circuit is divided into two types in principle. One is a circuit that fixes the equal loudness control amount. It is relatively simple. This circuit is generally provided with an equal loudness switch. When necessary, the equal loudness switch is pressed. There is also an advanced linear equal loudness control circuit. With the volume, the amount of equal loudness compensation will change to achieve the most linear effect. Such a circuit often has no equal loudness switch and is linearly controlled by the volume potentiometer.
Technically, it is divided into a loudness control circuit such as an analog circuit and a loudness control circuit such as a digital circuit. The digital equal loudness controller can select several different equal loudness curves and achieve full linear control.
The equal loudness control circuit will increase the distortion and degrade the signal-to-noise ratio. Therefore, it is generally used in car audio and popular amplifiers. High-end amplifiers and professional amplifiers do not have equal loudness control circuits.
Ethernet Passive Optical Network (EPON), as the name implies, is a PON technology based on Ethernet. It adopts point-to-multipoint structure, passive optical fiber transmission, and provides multiple services on Ethernet. EPON technology is standardized by the IEEE802.3 EFM working group. In June 2004, the IEEE802.3EFM working group released the EPON standard-IEEE802.3ah (incorporated into the IEEE802.3-2005 standard in 2005). In this standard, the Ethernet and PON technologies are combined, the PON technology is used in the physical layer, the Ethernet protocol is used in the data link layer, and the PON topology is used to realize Ethernet access. Therefore, it combines the advantages of PON technology and Ethernet technology: low cost, high bandwidth, strong scalability, compatibility with existing Ethernet, and convenient management.
EPON RF ONU, CATV PORT ONU, CATV ONU, CATV EPON ONU
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