The use of high-fidelity headphones to listen to music is of high resolution, without the need for overly complicated configurations, and it can get several times the playback level of its desktop audio combination at a low cost. It is also very convenient to use and the listening effect is not affected. The influence of time and environment, even if the "aircraft cannon bombing" in the middle of the night, don't worry about affecting others. High-fidelity headphones have a balanced sound field, clear levels of detail, and sufficient dynamics, especially in the reproduction of mid-to-high frequencies, with a clear, sweet, warm and true tone.
High-fidelity headphones have a wide frequency response and low distortion that are unmatched by desktop Hi-Fi audio, especially some brand-name headphones, even some of the best speakers can not be compared with it.
Why are headphones good?
One is that the headset has an accurate sense of orientation. There is only one sound point of the headphones. As long as you put on the left and right headphones accurately, you can enjoy a very accurate sense of stereo orientation, accurately reproducing the stereo orientation processing of various sound sources and musical instruments by the sound engineer, making you feel like you are there. Realism of the environment. The traditional sound is affected by environmental noise, speaker positioning, left and right channel crosstalk, listening position, listening environment and the phase shift of the speaker crossover, distortion, plus the quality of the amplifier, sound source and other equipment, improper matching, etc. Disadvantages, how easy is it to get immersive on-site effects?
Second, the headset is full of space. The distance between the sound of the traditional audio and the earphone is very different from the human ear. The sound field experienced by the earphone is centered on the head and spreads forward in a spherical shape, while the sound field of the sound system is spread in front of the listener left and right and in depth. Listening to music with headphones, people are absorbed in the wonderful music, which is deeply infected with the ups and downs of music. Listening to music with headphones seems to be isolated from the world, like a paradise, it is no longer hindered by the acoustic characteristics of the environment, and the crosstalk of the left and right channels is eliminated, and the sound is directly transmitted to the ear, which can bring shocking and accurate original sound effects.
The third is pure and true tone. Enthusiasts all know that the pronunciation unit of the headset does not need more power, and the signal from the sound source does not need to pass through the level-by-level amplification circuit like the traditional audio system, thereby maintaining the original sound of the sound. As we all know, the more "levels" the signal passes, the more distortion and pollution the sound will have, and the sound quality will be impure. The frequency response index of some high-end headphones can be better than 20Hz-20KHz. For example, the frequency response of the Sennheiser HD580 is: 12Hz-38000Hz, I would like to see if some of the best speakers on the market have such a wide frequency response?
The vibration quality of the headphone unit is small, only in the order of milligrams, and the ordinary speaker is a few grams, or even dozens of grams, and the movement of the speaker is affected by the "piston" movement, etc., which reduces the quality of sound reproduction. The vibration quality of the headphones is small, so the transient is very good, the control ability is strong, the resolution is high, the dynamic range is large, and the sound is of course pure.
Maybe some audiophiles will ask: Can you get Dolby multi-channel surround home theater effect with headphones? The answer is yes. And there are finished products on the market! For example, Sennheiser ’s LUCAS surround sound headphone processor (market price is about 2,000 yuan), and there are AKG surround sound headphones. These surround headphones plus a portable portable VCD / DVD player can form a “portable "Cinema" meets the needs of individuals who are traveling on a business trip. The "Cinema" who needs to play on the computer can also work with the computer. The effect is even better! As hands-on and enthusiasts, we can certainly make one ourselves!
Putting on headphones is like entering the realm of ecstasy and savoring music, so in addition to choosing a good headset, choosing a good headphone amplifier circuit is also a job that needs to be paid attention to. Of course, if you have more than two silver pockets, of course Buy more than a thousand yuan of finished earphone amplifiers! Saving is the traditional virtue of our Chinese people. Here we introduce a virtual Dolby surround BBE headphone amplifier circuit designed by the author to obtain virtual Dolby surround effect and high-definition sound quality enhanced BBE effect. The sound quality is pure, The level of detail is clear, and the cost is not much. Those who are interested may wish to use one. The circuit schematic is shown in the figure.
Design and production points: In order to facilitate the installation into the computer, you can use the 12V power supply in the computer. The volume, tone, surround switch, and headphone socket are all in one direction. The width of the whole board cannot exceed 14.5 cm, because the computer optical drive (CD- ROM) The two reserved spaces below, each of which is about 14.5╳ 4 cm, and these two spaces are removable, we will use one of them to drill holes as the panel of this headset, so that it is convenient for our used.
Production principle: using the top virtual Dolby surround circuit QS7779 and the most advanced BBE circuit XR1075, the output stage is composed of Hitachi D669 for single-ended Class A amplification, and then equipped with fever supplement components. The principle is shown in Figure 1. The electrolytic capacitor uses ELNA high speed Tonic, with volume surround high and low frequency compensation adjustment and power surround switch, socket. The size of the circuit board is 13 × 8 cm (it can be installed in the empty space under the optical drive of the computer host, the power supply can be directly used by the 12V power of the computer, so that your computer has a fever). The surround and sound quality are excellent! !
If it is convenient for use, this circuit and transformer can be installed in a small box (conditional ones can find a large aluminum alloy material to make elaborate, more beautiful and more creative), to make a finished machine, and invest only It is more than a hundred yuan, which is worth the money. It not only increases the ability to make a fever, but also obtains a fever baby. What is more gratifying is the joy and excitement of success!
We use the Q-Surround virtual Dolby surround sound technology chip QS7779 from Q-Sound of Canada to decode the mixed signal of Dolby directional logic or Dolby Digital AC-3, and then perform three-dimensional virtual Dolby surround processing, and then send it to XR1075 for BBE sound enhancement (BBE sound enhancement technology is a patented sound technology used by the US BBE Sound Inc. to improve listening quality, which can correct and restore the signal loss and phase deviation of the audio system due to various reasons, thereby making the sound Really reproduced, so that the listener feels rich and low bass, positioning clarity, brightness is close to the ideal live effect.), And finally sent to Hitachi D669 for single-ended Class A amplification, so that only need to wear headphones, use The two-channel achieves the multi-channel Dolby surround sound effect, and the sound movement, positioning, and effect are better than the virtual surround effect released by the two speakers. Sometimes, if you can see it, the aircraft will fly over your head from behind. You will evade involuntarily when the fist in front hits you and reach out to parry! ! ... realistic!
Note: For the safety of the earphone, the earphone should be plugged in after the power is turned on. When not in use, turn off the earphone and then turn off the power to prevent the DC impact when the power is turned off to damage the earphone, otherwise it will really "burn!"
Good horse with gold saddle, component selection: ①The circuit board adopts silver plating process (helps to improve the analytical power of small signals, you can hear more levels of detail); ②The resistance is all imported metal film with low noise and precision (± 1% ) Five-color ring resistance; ③Thomson MKP capacitor of the Netherlands for electrodeless capacitors; electrolytic capacitors should use ELNA high-speed supplements from Japan; ④potentiometers are made of high-quality products X · T brand (conditional ones can use Japanese ALPS better) Channel D669 should be paired, and add a radiator. ⑥ The direction of the circuit ground wire should be properly handled, and the input and output grounds must be connected to the power capacitor.
Installation and use: After making a good check, use a CD player to test. After connecting the cable, do not play the CD. Insert the earphones and turn the volume potentiometer to the maximum. There is only a slight current sound (you ca n’t hear it during the day, the night is quiet at night) I only heard it from time to time), so good (note: there will be a slight background noise when added to the computer, this is a problem with the computer). It is easy to install into the computer: disassemble the mainframe of the computer without power supply, remove one of the two spaces reserved under the CD-ROM, and then press the potentiometer, switch, Drill holes on the location of the headphone socket, fix the headphone amplifier board and put it back into the computer, and then connect the power supply to the headphone amplifier board D-shaped socket (there are several groups of 12V + 5V in the computer, don't connect the 24V one Group, it is best to use a multimeter to measure), and finally connect the audio signal, there is audio output on the sound card of the computer (if the motherboard with its own sound card can refer to the manual, if you do n’t understand "chicken intestine", connect it from the back of the host) . Don't rush to plug in the headset after installing the headphone amplifier board. Observe the power for ten minutes to see if there is smoke. Please turn off the power switch if there is any. Check the problem and use it only after eliminating it! In order to obtain the best sound quality, please turn on the power for about ten minutes in advance every time you use it, because the Class A amplifier needs a little temperature and the best sound! Of course, it can be used immediately after power-on, and it will be better to listen to for ten minutes. When using it, flexibly and flexibly adjust the high and low frequency compensation potentiometer and surround switch of BBE according to your own preferences (if you turn on the surround, there will be a surround effect of widening sound field Dolby discs have a significant virtual Dolby surround effect), Note: The headphone amplifiers QS7779 and XR1075 are both sound processors, and there is no gain for audio signals, so the driving force for high-impedance headphones is a bit weak. The solution only needs to add an op amp multiplier circuit to XR1075 and D669.
Listening experience: plug in the headset for about ten minutes after power-on, and use the CD "Deng Lijun Album" to put it into the computer's CD-ROM. The sound effect is beautiful and beautiful! After listening for several hours, why? ? I still need to ask! Of course it is good to listen for so long! ! This single-ended Class D Dolby Surround BBE headphone amplifier has excellent resolution, overall a rich sense of layering, and high-frequency slimness. It is more beautiful to activate the virtual Dolby Surround sound effect, which fully reflects the advantages of virtual Dolby Surround and BBE circuits! The sound effects are most vividly displayed! !
Finally, remind fake enthusiasts to pay attention: pay attention to the design of the input ground and the output ground on the circuit board must be separated to the power supply before connecting, and must be selected according to the components mentioned in the article to make. Only in this way can you get good results! This single-ended Class D Dolby Surround BBE headphone amplifier can be used at the current level, and can replace and upgrade existing audio.
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