First, how is the headset classified?
This article refers to the address: http://
1. According to the principle of transducer (Transducer)
Mainly in the dynamic (Dynamic) and electrostatic (Electrostatic) headphones two categories, although in addition to these two types of there are several types of magnetic, but have been eliminated or used in professional use market is very small I will not discuss it here.
Dynamic ring headset principle:
At present, most (about 99%) earphone earphones are of this type. The principle is similar to that of ordinary speakers. The coil in the permanent magnetic field is connected to the diaphragm, and the coil drives the diaphragm to sound under the signal current.
Static headphones:
The diaphragm is in a changing electric field, the diaphragm is extremely thin and accurate to a few micrometers (currently STAX's new generation of electrostatic earphone diaphragm has been accurate to 1.35 microns), and the coil drives the diaphragm to sound under the electric force.
2. According to the degree of openness
Mainly open, semi-open, closed (closed)
Open-type headphones: Generally, the listening sound is natural and comfortable to wear. HIFI headphones that are commonly used in homes can be heard, and the sound can be leaked. On the contrary, the external sound can be heard. The earphones have less pressure on the ears.
Semi-open: There is no strict regulation. The sound can only be entered or not, and the corresponding adjustment can be made according to the needs.
Closed: The earmuffs are pressed against the ear to prevent sound from entering and exiting, and the sound is correctly positioned. This is common in the professional monitoring field. However, this type of earphone has a disadvantage that the bass sound is serious, and the W100 is an obvious example.
3. By purpose
Mainly Home, Portable, Monitor, Mix, Binaural Recording
Second, what are the meanings of some related parameters and sound quality terms of the headphones?
1. Headphone related parameters
Impedance: Pay attention to the difference between the meaning of the resistance. In the world of direct current (DC), the effect of the object on the current obstruction is called resistance, but in the field of alternating current (AC), in addition to the resistance will block the current, the capacitance and inductance It also hinders the flow of current. This effect is called reactance, and the impedance we use everyday is the sum of the resistance and the reactance in the vector.
Sensitivity: The sound pressure level that the earphone can emit when the input power of 1 mW is input to the earphone (the unit of sound pressure is decibel, the louder the sound pressure is, the higher the volume), so the higher the sensitivity, the smaller the impedance, the earphone The easier it is to sound, the easier it is to drive.
Frequency Response (Frequency Response): The sensitivity value corresponding to the frequency is the frequency response. The image is the frequency response curve. The range of human hearing can reach 20Hz-20000Hz. The mature earphone technology has reached this level. Claim.
2. Sound quality evaluation terminology
Range: The range between the highest and lowest notes of a musical instrument or vocal
Tone: Also known as a sound, one of the basic attributes of sound, such as erhu, çµç¶ is a different sound
Sound Dye: The opposite of the natural neutrality of music, that is, the sound is dyed with some features that the program itself does not have. For example, the sound that is heard in a jar is a typical sound. The sound dye indicates that some of the components are added (or reduced) in the reproduced signal, which is obviously a distortion.
Distortion: The output of the device cannot fully reproduce its input, resulting in distortion of the waveform or an increase or decrease in signal components.
Dynamic: Allows recording of the ratio of the maximum information to the minimum information
Transient response: The ability of the equipment to follow burst signals in music. The equipment with good transient response should respond immediately when the signal comes, and the signal will stop when it stops, and it will never drag the water. (Typical instrument: piano)
Signal-to-noise ratio: Also known as the signal-to-noise ratio, the useful components of the signal are compared to the strength of the noise, often expressed in decibels. The higher the signal-to-noise ratio of the device, the less noise it produces.
Air Sense: An acoustic term used to indicate the treble or the spatial separation between instruments in the sound field. At this time, the high frequency response can be extended to 15 kHz to 20 kHz. The antonyms are "dull" and "thick".
Low frequency extension: refers to the lowest frequency that audio equipment can reproduce. It is used to determine the extent to which the sound system or speaker can dive when replaying the bass. For example, a small subwoofer can have a low frequency extension of 40 Hz, while a large subwoofer dive to 16 Hz.
Bright: refers to highlighting the high frequency range of 4kHz-8kHz, where the harmonics are relatively stronger than the fundamental. There is nothing wrong with the brightness itself. The live concerts have bright sounds. The problem is that the brightness is well controlled, and the brightness is too bright (or even whistling).
Third, on the relevant knowledge of amplifiers
1. General amplifiers can be divided into two types: transistor (stone machine) and electron tube (amplifier) ​​amplifier.
2. Amplifier
A general term for preamplifiers and power amplifiers.
Power amplifier
Referred to as a power amplifier, an electronic device used to enhance the signal power to drive the sound of the speaker. A power amplifier without an accessory function such as source selection and volume control is called a post stage.
Preamplifier
The pre-amplification and control section before the amplifier is used to enhance the voltage amplitude of the signal, providing input signal selection, tone adjustment and volume control. The preamplifier is also called the preamplifier.
3. Class A amplification (class-A)
Also known as Class A amplification. A working state for the amplifier. At this point the transistor or tube amplifier will amplify the entire audio signal.
Class B amplification (class-B)
Also known as Class B amplification. A working state for the amplifier. At this point one transistor or tube amplifier will amplify the positive half of the audio signal, while the other transistor or tube amplifier amplifies the negative half of the signal.
Class AB amplification (class AB)
Also known as class AB amplification. A working state of the amplifier. At this time, the output stage of the amplifier is in the Class A amplification state when the output power is low, and is converted to the Class B amplification when the output power is high.
Fourth, about the headset wire
Most earphone cables are made of copper. The general purity (usually expressed by a few N, such as 4N, 6N...) is higher the conductivity, and the smaller the signal distortion, the common ones are:
TPC (electrolytic copper): purity is 99.5%
OFC (Oxygen Free Copper): 99.995% purity
LC-OFC (linear crystal oxygen-free copper or crystalline oxygen-free copper): purity above 99.995%
OCC (single crystal oxygen free copper): the highest purity, above 99.996%, divided into PC-OCC and UP-OCC
V. About front-end equipment
Many HIFI enthusiasts are used to separating the phonograph into two parts, the turntable and the decoder, to get better sound quality music.
Front-end: A signal source in a multi-finger audio system, such as an LP compact jogger or CD player, sometimes referred to as a preamp in a tuner (receiver) that processes signals received from the radio.
CD turntable: A machine that separates the mechanical transmission of the CD player.
D/A converter: A device that converts digital audio signals into analog audio signals in digital audio products such as CDs and DVDs. The D/A converter can be made as a stand-alone machine for use with the CD turntable, often referred to as a decoder (DAC).
Do you know which is the most competitive student laptop for elementary students or daily entertainment? It`s this 14.1 inch celeron n4020 64gb laptops on sale for students, since not only lightweight, but also entry celeron cpu, storage, longer lasting battery, etc. More than 80% clients choose this student chromebooks for students tender cause it`s of all features of laptop for online classes. Of course, this model is also suitable for operating student laptop deals.
As a professional oem&ODM manufacture, never let you down. No matter you look for 14inch 64gb student pc, 15.6 inch N5095 Teacher Laptop, 15.6 inch 10th or 11th University Laptop, 16.1 inch 4gb graphics recommended laptop for programming, Android Tablet, Mini PC or All In One PC , always have the right one here for you.
Therefore, just feel free to contact us and share your basic requirement, like size, cpu, ram, rm, quantity, special requirements, so that send back right details for you.
Of course, any other things except business we can do in China, also willing help.
Student Laptop,Student Laptop Deals,Laptops On Sale For Students,Student Pc,Laptop For Online Classes
Henan Shuyi Electronics Co., Ltd. , https://www.shuyilaptop.com