【 Weak current College 】 appreciation audio concepts-Power By 【 China power house network 】

Each instrument has its unique spectrum, timbre, in order to improve the capacity of music appreciation, be sure to do a comparative listening, that is, when playing a piece of music, speaker system emits sound and practical instruments which different timbre, departure from how many, etc. In order to carry out a comparative listening, first you should understand some electro-acoustics terminology concept, ear hearing characteristics and sound system the main technical parameters of indicators.

1. the part of the electro-acoustics terminology explained

1. pure tone: it has two meanings: (1) means the instantaneous sound pressure over time as a sine wave of change; (2) means a clear single tone of voice.

2. the pitch: refers to the minimum frequency of composite codes.
3. overtone: composite tone pitch in more frequently than the frequency of the composition can be pitch frequency of multiples, or not. Various musical instruments with different playing method can produce the number and strength of different overtone components, even if the pitch is the same as also can have a different timbre.
4. Sonic: elastic medium dissemination of a mechanical waves, originated in the vibration of sound. Sonic range 20Hz-20KHz, more frequently than the ultrasonic sound waves to 20KHz, lower frequency than the sound wave to time 20Hz acoustic, ultrasonic and infrasonic General cannot cause hearing, only the frequencies of sound waves in between can be heard, we are able to hear sound waves is called wave or audible sound.
5. sound field: refers to the medium of a Sonic. Different sound sources and environments can create different sound field.
6. loudness: also known as the "volume", the human ear on the size of a volume. Depending on the intensity, frequency and waveform.
7. tone: also called "timbre", mainly by the availability of its harmonics and the homonym of relative amplitude.

2. the ear of auditory characteristics

Human ear on the sound direction, loudness, pitch and timbre of sensitivity is different, a large difference.
1. position: ear on sound propagation direction and distance, location of discrimination is very strong. Ear of the auditory characteristics are known as the "orientation".
2. the loudness perception: tiny sound, as long as the loudness slightly more human ear can feel, but when sound loudness increase to a certain value, even if there is a large increase in the sense of the human ear but no obvious change. Usually you can listen to the sound by harmonic relationship is divided into 3 to determine the lower, middle and treble frequency bands. The bass frequency bands in the audio section 20Hz-160Hz, 160Hz-2500Hz, treble frequency 2500Hz-20KHz.
3. the interested tone: refers to the human ear on the timbre of a special hearing on comprehensive experience.
4. focus effect: ear hearing characteristics from a multitude of voices to one point. If we listen to the Symphony, the energy and listening to the sound of the violin, the other instrumental music is inhibition of the cerebral cortex, make your auditory feel purely acoustic violin playing. This inhibits the capacity varies from person to person, often done listening exercises of inhibitory ability is strong, we had the ear of the auditory characteristics referred to as the "focus" effect. Do this exercise, you can improve the human auditory on a spectrum of colours, quality, analytical ability and level of ability.

III. impact sound, tone of the main technical indicators

1. frequency range (Hz): power amplifiers in the distortion and rated output power conditions of work, namely bandwidth amplifier minimum frequency to the maximum operating frequency in the range.
2. frequency response (in decibels dB): power amplifier output gain with the input signal frequency changes raise or attenuation and phase lag with the input signal frequency and the same phenomenon. This indicator is the examination of the merits of power amplifiers of quality is the most important basis for the DB and small description power amplifier frequency response curve is flat, distortions, signal reliability and reproducibility of restore capability.

A good audio equipment, in addition to the various instruments of phonological representation, but also the various instruments of location, distance, scene reproduced. Regardless of the personal preference of the tone or models, if you play out the tone and the original instrumental tone differences with auditory, it cannot be regarded as a good equipment. High definition audio (Hi-Fi) really mean a high reductive degrees. If your audio equipment cannot restore the original musical instruments sound flavor, then just not high definition equipment. When we use a subjective judgment hearing, sound equipment, fully aware of this, not because of personal preference and affect the correct judgment and differential capabilities.