| Foreword: The purpose of this article is to unravel some of the mysteries surrounding the "up-conversion" processing technique. |
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I don't know if you noticed that the lowest end of the distortion band has "invaded" to 24.1 kHz (44.1 kHz minus 20 kHz). There is no doubt that this band is too close to the listening range of the human ear. It is necessary to filter them effectively to avoid serious damage to the sound quality, such as: IMD intermodulation distortion, tweeter overload (even burned out), the amplifier receives a large amount of ultrasonic signals and the like. For this reason, Sony used a filter component group called “Brick Wall Filter†on their first generation CD player: 9-11-order analog filters are added together in extremely complicated ways for audio signals. Filtering is performed. In the actual situation, this arrangement greatly degrades the sound quality because it causes severe phase drift and chopping interference in the frequency band.
In comparison, Philips' design idea is to trick the digital-to-analog converter into thinking it is processing a 176.4 kHz signal. This means that those bands with significant distortion are pushed to near 176.4 kHz and its multiplier. Since the affected distortion bandwidth remains at ±20 kHz at this time, the lower end of these bands is completely cut off at 156.4 kHz, which is very far away from the earliest listening audio segment of the human ear. Moreover, this also allows the designer to adopt an analog filter with a simpler structure and better performance. Philips' design has been widely adopted by global manufacturers for quite a long time. Because since 1982, for
It is possible to use an analog filter with a simple structure and excellent performance, and almost every CD player uses an oversampling technique. In recent years, DAC chips capable of restoring all 16-bit information at higher conversion frequencies (4x, 8x, or even 16x oversampling) have been found on the international market. With the development of technology, a large number of 18-bit DACs, 20-bit DACs, and 24-bit DACs have been introduced one after another. These chips are capable of operating at very high switching frequencies and maintaining excellent accuracy. Now, even the cheapest DAC on the market has surpassed everything that 1982's highest technology can offer.
What is the key to the problem?
The key point is that in order to facilitate digital-to-analog conversion, the "up-conversion" processing of digital audio equipment has become the only leading idea of ​​many manufacturers in designing products. Since 1982, this technology has been called "oversampling" by some people, but whether you call it "oversampling," or "upconversion," or "upsampling." ), or something else, they all refer to the same thing: converting raw sample data to a higher sampling frequency/bit number for higher quality digital-to-analog conversion.
There are still people asking us: "When will Mark Levinson come up with a CD that can make me 44.1kHz/16bit, and it sounds 96kHz/24bit?", you know, all Mark Levinson in active service. The decoder will oversample (or "up") the digital signal to 352.8 or 384kHz depending on the characteristics of the original input signal. So why do you want us to reduce the replay standard to only 96kHz or 192kHz?
The deviation in the understanding of the "up-conversion" technique comes mainly from the fact that the listener can (with some equipment) instantly change the "up-converting" digital filter or its filtering characteristics, and by comparison to determine which The sound quality of the state is the best. It is undeniable that the difference in sound quality does exist. When we developed our products ourselves, we have already noticed the huge differences reflected in the subjective sense of hearing using different digital filters. If we add a button to our processor that allows you to make some changes to the digital filter inside the machine, you will certainly hear a considerable difference. Or, we “outside the processâ€, making it a product independently and putting it on the market to make a big profit. But doing so has no benefit to the interests of our customers.
I don't know if you noticed that the lowest end of the distortion band has "invaded" to 24.1 kHz (44.1 kHz minus 20 kHz). There is no doubt that this band is too close to the listening range of the human ear. It is necessary to filter them effectively to avoid serious damage to the sound quality, such as: IMD intermodulation distortion, tweeter overload (even burned out), the amplifier receives a large amount of ultrasonic signals and the like. For this reason, Sony used a filter component group called “Brick Wall Filter†on their first generation CD player: 9-11-order analog filters are added together in extremely complicated ways for audio signals. Filtering is performed. In the actual situation, this arrangement greatly degrades the sound quality because it causes severe phase drift and chopping interference in the frequency band.
In comparison, Philips' design idea is to trick the digital-to-analog converter into thinking it is processing a 176.4 kHz signal. This means that those bands with significant distortion are pushed to near 176.4 kHz and its multiplier. Since the affected distortion bandwidth remains at ±20 kHz at this time, the lower end of these bands is completely cut off at 156.4 kHz, which is very far away from the earliest listening audio segment of the human ear. Moreover, this also allows the designer to adopt an analog filter with a simpler structure and better performance. Philips' design has been widely adopted by global manufacturers for quite a long time. Because since 1982, for
It is possible to use an analog filter with a simple structure and excellent performance, and almost every CD player uses an oversampling technique. In recent years, DAC chips capable of restoring all 16-bit information at higher conversion frequencies (4x, 8x, or even 16x oversampling) have been found on the international market. With the development of technology, a large number of 18-bit DACs, 20-bit DACs, and 24-bit DACs have been introduced one after another. These chips are capable of operating at very high switching frequencies and maintaining excellent accuracy. Now, even the cheapest DAC on the market has surpassed everything that 1982's highest technology can offer.
What is the key to the problem?
The key point is that in order to facilitate digital-to-analog conversion, the "up-conversion" processing of digital audio equipment has become the only leading idea of ​​many manufacturers in designing products. Since 1982, this technology has been called "oversampling" by some people, but whether you call it "oversampling," or "upconversion," or "upsampling." ), or something else, they all refer to the same thing: converting raw sample data to a higher sampling frequency/bit number for higher quality digital-to-analog conversion.
There are still people asking us: "When will Mark Levinson come up with a CD that can make me 44.1kHz/16bit, and it sounds 96kHz/24bit?", you know, all Mark Levinson in active service. The decoder will oversample (or "up") the digital signal to 352.8 or 384kHz depending on the characteristics of the original input signal. So why do you want us to reduce the replay standard to only 96kHz or 192kHz?
The deviation in the understanding of the "up-conversion" technique comes mainly from the fact that the listener can (with some equipment) instantly change the "up-converting" digital filter or its filtering characteristics, and by comparison to determine which The sound quality of the state is the best. It is undeniable that the difference in sound quality does exist. When we developed our products ourselves, we have already noticed the huge differences reflected in the subjective sense of hearing using different digital filters. If we add a button to our processor that allows you to make some changes to the digital filter inside the machine, you will certainly hear a considerable difference. Or, we “outside the processâ€, making it a product independently and putting it on the market to make a big profit. But doing so has no benefit to the interests of our customers.
I don't know if you noticed that the lowest end of the distortion band has "invaded" to 24.1 kHz (44.1 kHz minus 20 kHz). There is no doubt that this band is too close to the listening range of the human ear. It is necessary to filter them effectively to avoid serious damage to the sound quality, such as: IMD intermodulation distortion, tweeter overload (even burned out), the amplifier receives a large amount of ultrasonic signals and the like. For this reason, Sony used a filter component group called “Brick Wall Filter†on their first generation CD player: 9-11-order analog filters are added together in extremely complicated ways for audio signals. Filtering is performed. In the actual situation, this arrangement greatly degrades the sound quality because it causes severe phase drift and chopping interference in the frequency band.
In comparison, Philips' design idea is to trick the digital-to-analog converter into thinking it is processing a 176.4 kHz signal. This means that those bands with significant distortion are pushed to near 176.4 kHz and its multiplier. Since the affected distortion bandwidth remains at ±20 kHz at this time, the lower end of these bands is completely cut off at 156.4 kHz, which is very far away from the earliest listening audio segment of the human ear. Moreover, this also allows the designer to adopt an analog filter with a simpler structure and better performance. Philips' design has been widely adopted by global manufacturers for quite a long time. Because since 1982, for
It is possible to use an analog filter with a simple structure and excellent performance, and almost every CD player uses an oversampling technique. In recent years, DAC chips capable of restoring all 16-bit information at higher conversion frequencies (4x, 8x, or even 16x oversampling) have been found on the international market. With the development of technology, a large number of 18-bit DACs, 20-bit DACs, and 24-bit DACs have been introduced one after another. These chips are capable of operating at very high switching frequencies and maintaining excellent accuracy. Now, even the cheapest DAC on the market has surpassed everything that 1982's highest technology can offer.
What is the key to the problem?
The key point is that in order to facilitate digital-to-analog conversion, the "up-conversion" processing of digital audio equipment has become the only leading idea of ​​many manufacturers in designing products. Since 1982, this technology has been called "oversampling" by some people, but whether you call it "oversampling," or "upconversion," or "upsampling." ), or something else, they all refer to the same thing: converting raw sample data to a higher sampling frequency/bit number for higher quality digital-to-analog conversion.
There are still people asking us: "When will Mark Levinson come up with a CD that can make me 44.1kHz/16bit, and it sounds 96kHz/24bit?", you know, all Mark Levinson in active service. The decoder will oversample (or "up") the digital signal to 352.8 or 384kHz depending on the characteristics of the original input signal. So why do you want us to reduce the replay standard to only 96kHz or 192kHz?
The deviation in the understanding of the "up-conversion" technique comes mainly from the fact that the listener can (with some equipment) instantly change the "up-converting" digital filter or its filtering characteristics, and by comparison to determine which The sound quality of the state is the best. It is undeniable that the difference in sound quality does exist. When we developed our products ourselves, we have already noticed the huge differences reflected in the subjective sense of hearing using different digital filters. If we add a button to our processor that allows you to make some changes to the digital filter inside the machine, you will certainly hear a considerable difference. Or, we “outside the processâ€, making it a product independently and putting it on the market to make a big profit. But doing so has no benefit to the interests of our customers.
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