【 Weak current College 】 [tips] sound terminology---Power By 【 China power house network 】

1. rated power

On the amplifier, rated power generally refers to a valid value for continuous output (RMS) power; the speaker, the rated power as a speaker to suffer this value of power without damage, this does not mean that we need such a power amplifier to push farther, speaker of the main difficulty is driven by its sensitivity and impedance characteristics. It does not mean that you cannot mix output power greater than speakers rated power amplifier. As a car, driving 300 km/h speed sports car is not equal to an accident occurs, you can do so quickly. Similarly, if the volume does not blindly, high power amplifier can be equipped with small power speakers.

Second, the peak output power music (PMPO)

The music signal instant reach peak voltage to calculate output power, its commercial significance greater than the actual function. PMPO power than internationally recognized RMS rated output power (RMS) higher than 3 to 4 times, for example, early portable recorder per channel RMS power only 4, 5 watts, but using numerical marking, PMPO it can grow to about 20W.

3. peak output power music (PMPO)

Means the music signal moments of peak voltage to calculate output power, its significance is greater than the actual commercial advertising. PMPO power than commonly used effective output power (RMS) higher than 3-4 times.

IV. distortion

The device's output cannot reproduce its input, produce the waveform distortion or signal components.

5. harmonic distortion

Due to the amplifier is not ideal, the output signal in addition to including enlarged input components, added some of the original signal of 2 x, 3 x, 4 x ... Even more high frequency components (harmonic), leaving the output waveform shape. This caused as a result of harmonic distortion is called harmonic distortion.

6. harmonic distortion (harmonicdistortion)

Refers to the various existing frequency-doubling of harmful interference. When magnifying 1kHz sine wave will result in the second harmonic generation and 2kHz 3kHz of third harmonic and many more time harmonic.

Seven, intermodulation distortion (IMD)

Intermodulation distortion (intermodulationdistortion) shall mean amplifier introduced an input signal and and poor distortion. For example, to the amplifier input frequency be 1 kHz and mixed signal 5kHz will produce 6kHz (1kHz and 5kHz) and 4kHz (1kHz and 5kHz difference) of intermodulation distortion.

8, bass

Music nature neutral, that is the antithesis of the sound program itself does not have some features, such as a jar of speech that sound is typical of bass. Bass show replay signals in multiple out (or less) certain components, this is a distortion.

9. sound pressure

Meaning that the sound intensity of physical quantities.

10. sensitivity

Sensitivity to the amplifier, it generally refers to attain the rated output power or voltage input voltage of the signal, also known as the size of the input sensitivity; sensitivity to sound, the sound is to impose the input power 1W, 1 m in front of the loudspeaker to producing number distant DB sound pressure value.

11. dynamic range

Some of the strongest signal with the weak parts of level difference between. On the equipment, the dynamic range represents the equipment on the strength of the signal of reconciliation of processing power.

12, frequency response

Simply measure the frequency response, a piece of equipment for high, medium, and low representation of the frequency band signal uniform. On equipment frequency response of the request has two parts: one is a wide range of possible, i.e. to be able to replay the lower limit of the frequency is low, as far as possible, high-ceiling; the second is the points in the frequency range of response to smooth, avoid excessive fluctuations.
13. transient response

Equipment for music in signals follow. Transient response of equipment should be a signal to respond immediately to stop the signal a GA however only, never slow.

14, signal to noise ratio (S/N)

Also known as CyberLink noise ratio, signal and noise of the useful ingredients of the contrast, often represented by DB. Device-to-noise ratio, the greater demonstrate that it produces less noise.

15, impedance matching

A piece of equipment output impedance and the connected load impedance between a relationship should be satisfied in order to avoid access to the load on the equipment itself had a notable impact on the State. The interconnection of electronic equipment, such as signal source attached amplifier, fore even after the class, as long as the input impedance after level is greater than the top level output impedance 5-10 times above, you can view the impedance matching good; for amplifier connection speaker, electron tube machine should use its output nominal impedance equal or close to the speaker, but this is not a transistor amplifier, you can add any impedance speakers.

16. impedance (impedance)

Refers to the current rendering of resistance. Impedance including pure resistance and inductance, capacitance and resistance of sensing capacitance.

17, input impedance (inputimpedance)

Means the circuit or equipment to facilitate its circuits or equipment renders out impedance. Input impedance including resistance, inductance and capacitance resistance.

18. burning machine

New equipment for the use of power before the warm-up of the aging process, so that the sound into the stable equipment.

19, balance (balance)

Means the audio spectrum, high and low segment on the relative loudness between the existence of objective relations; also referred to as two-channel stereo left and right channel signal same (balance).

20. frequency (frequency)

Means a cycle of iterations, or the number of cycles per second. Measurement unit for Hz (Hertz), such as the frequency to 1000Hz (1kHz) audio signal per second will have 1000 sine wave frequency.

21, frequency response (frequencyresponse)

The form of a chart to show the audio equipment relative amplitude and frequency as a function of time.

22, sound and image positioning (imagespecificity)

A musical instrument or vocal sound like to accurately positioning even can clearly determine the characteristics of the sound field.

23, digital speaker (digitalloudspeaker)

Usually refers to a built-in digital crossover networks and power amplifier's speakers. Digital speaker input signal to a digital bit stream, using digital signal processing methods will split the audio spectrum, respectively, will these signals into analog signals, and then by the respective power amplifier and to promote the corresponding pronunciation in sound.

24, passive subwoofer (passivesubwoofer)

Refers to the need for a separate power amplifier to boost the subwoofer. Unlike the box is equipped with a separate power amplifier "active-subwoofer (activesubwoofer).

25, digital volume control (digitalVolumeControl)

Means through is used to represent the audio signal of 0 and 1 mathematical operations to adjust the signal level of a digital circuit.
26, reset the speaker (center-channelspeaker)

A home theater system mounted to the top of the video monitor, or following a speaker. Is used for replay center channel sent to human dialogue, information, and other actions on the same screen some tones.

27, inverted phase-speakers (bassreflex)

Also known as phase-type opening hole boxes, lines at the speaker panel on a down-hole (Groove) of a class speakers. As a result of having a hole inside voice can radiation outside. Phase-speaker than closed low frequency extension to sound better, but the bass is often not so strong and compact. Comparison of "infinite baffle (infinitebaffle)

28, active subwoofer (activesubwoofer)

Refers specifically to replay the low frequency, and the built-in power amplifier to drive that kind of sound box.

29, surround sound box (surroundspeaker)

Means at the listener side or rear dedicated to replay the surround channels of audio signals from the speakers.