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Uncover the mystery of the headset

A headset is an electro-acoustic transducer that is a listening device that converts an electrical signal into a sound signal and wore it on the head or in the ear. Unlike the loudspeaker, the headset's function is to produce a sound pressure in a small hole, and the loudspeaker radiates beats by dre wireless the sound energy to the free space. The headphones work basically in the 20Hz-20KHz ear-piercing band, which is an extremely limited area of ??acoustics from the frequency of zero hits to several tens of megahertz's special ultrasound. But even such a narrow band, the high-end frequency is higher than the low-frequency 1000 times. If this ratio of 1000/1 is considered in an equivalent resistance network design, it is found that the problem is very serious, which makes the design and manufacture of high quality headphones very difficult.

Headset design, must be in the machine - electricity - sound of the three systems exist in many contradictory factors in the use of compromise approach, and thus to a certain extent with many designers subjective ideas and techniques, cheap beats which formed a different brand, Different types of headphones "personality" and "taste".

Many of the friends asked, "Which headphones are best to listen to?" This is the same as "what kind of frequency is the best to eat?", Often make the responders do nothing. Although the words, but if the various mechanisms of the headset, structure, features first have a basic understanding, or can be made in mind, and then according to their own purposes, and then the purpose of the many headphones in the brand and model Choose the audition, it is not difficult to find their own products. An electroacoustic transducer in an earphone, often referred to as a "sound unit". It is the core components of the headset, the basic decision of the overall performance of the headset. Headphones generally use a single type of electro-acoustic transducer, but in order to broaden the frequency of sound playback, improve its performance, there are individual headphones using two electro-acoustic transducer. But this kind of headphones because the structure is more complex, but also because of the new diaphragm material and technology does not appear, the current structure of the dual electro-acoustic transducer in the current headset manufacturing has been used. Moving iron electroacoustic transducer, also known as electromagnetic electro-acoustic transducer. It is with the invention of the phone, then mainly used for telephone communication of the receiver in the movable iron electro-acoustic transducer is mainly fixed in the magnetic circuit in the coil and vibration of the ferromagnetic components. Alternating current through the coil when the alternating magnetic field, so that the magnetic circuit in the iron diaphragm or armature force changes and vibration sound.

The earliest practical movable iron electroacoustic transducers were designed by the inventor of the telephone, A. G Bell and T. Watson, 1876. In 1930, W. C. Jones of the United States and J.Sl Roberto, of the United Kingdom, developed a balanced improved receiver that, through the full theoretical study of magnetic principles and the use of the latest magnetic materials, Drive system is completely updated, making the performance has been greatly improved, frequency response up to 200Hz-3500Hz, which replaced the Bell's design.

Incidentally, as early as 1860, the German young physicist Rice had invented a wonderful device. He cut the wooden beer barrel into the shape of the ear, at the port at the porch of the porch, and add the magnet and wire into the transmitter, it can make the sound into the current fluctuations. The receiver is fixed on the violin around the coil with a needle, it is said that this device can pass a simple statement. He calls this device a telephone "Telephone". The other thing was that Eliza Gray had filed a similar patent application only three hours after Bell and Watson invented the moving iron receiver. But it was the three-hour difference that only remembered Bell and Watson, but Gray was forgotten forever.

In 1950, the ring-shaped armature electroacoustic transducer, abandoned the ferromagnetic plane plate diaphragm, began to use the ring armature and adhesion of its beats by dre non-ferromagnetic conical radiator to the end of the quality, so that the output sound Pressure increased by 5 dB, the frequency range extended about 500Hz, the successful design of the movable iron electro-acoustic transducer performance to the extreme.

High-impedance moving iron headphones are the first tool to listen to radio, and its sensitivity is extremely high, tens of micro-watts of power can drive it. In the fifties before and after the 1950s for the varieties of ore radio, the impedance of 2000 and 2000 ohm and two, the frequency of 200Hz-3200Hz. Later, in order to drive the power of the larger tube and semiconductor radio mated, resulting in 300 ohm to 800 ohm medium-resistance moving iron earplugs and 8 ohm to 16 ohm low impedance movable iron earplugs.

The frequency response of the moving iron headphones is very narrow, the best products, frequency response can only reach 150Hz-4000 Hz, which is due to its impedance characteristics were "inductive" and iron diaphragm or armature is also heavy Solid. With the development of electro-acoustic technology it has gradually disappeared. But the moving iron headphones in the early communication, radio, and even measurement technology have been very widely used, it is used in the design of the basic analytical methods and equations of motion, led to the analogy, frequency balance, mechanical system damping Principle, the future development of high-performance headphones have played a very important role, so we should not forget it. The moving coil electroacoustic transducer, also known as an electro-acoustic transducer, is made using the principle that the energized conductor can produce a displacement in a constant magnetic field. Unlike the movable iron electroacoustic transducer, the vibrating part of the moving coil electroacoustic transducer is composed of a coil (called a voice coil) wound around the skeleton, It is a non-ferromagnetic parts, and the former part of the vibration of the magnetic circuit is a vibratable part (ferromagnetic diaphragm or armature), is a ferromagnetic parts. This is the "moving iron" and "moving coil" called the origin of the law.

The change in the structure of the moving coil electroacoustic transducer has brought about a qualitative change in performance. First of all, it can be used in the diaphragm is very light, toughness, good rigidity of the polymer film to create, so that the vibration system can be a great degree of axial recovery, so that the swing greatly increased, and not Will produce excessive mechanical or magnetic nonlinear distortion. Second, its impedance characteristics are basically "resistive", which makes the audio signal high frequency and low frequency side can be more easily beats earphones to the distortion-free playback