| Notebook sound card audio solutions articles | | | | card as a synonym of soft. |
| The past two years more and more users are | | | | Test Description |
| beginning to realize the benefits of portable, laptop | | | | The test uses the latest release of the new Asus |
| computer sales momentum and therefore can not | | | | Centrino laptops, software and hardware |
| block stiffness. Laptops in the past has been to office | | | | configurations shown below. Objective test used |
| systems to appear, there are many companies | | | | RMAA 5.5 (RightMark Audio Analyzer) test software, |
| starting to focus on its entertainment, but audio | | | | Dell Inspiron 6000 Battery the audio cable required for |
| performance Sony VGP-BPL2 Battery still not | | | | use of the Diamond Monster Sound MX200 sound |
| satisfactory. To keep the sound to become the | | | | card in the included audio test line. The most common |
| bottleneck of entertainment notebooks, we have | | | | test used 16bit 44.1kHz sampling rate standards. |
| created the topic dedicated to those who like games | | | | Test platform configuration table |
| and video entertainment notebook users. This topic is | | | | Hardware platform |
| divided into three parts, including: laptop sound card, | | | | ASUS W5000A CPU Pentium M 770 |
| speakers and headphones, let us first look at notebook | | | | Chipset i915GM |
| sound card. Why are hard to break the audio quality? | | | | Memory DDR2-400 768MB |
| Notebook audio quality is difficult to break through the | | | | Software Environment Operating System Windows |
| main reason why the term is limited to the size of | | | | XP + SP2 Chinese version of the sound card driver |
| notebook computers. In fact, the built-in sound card | | | | SB Live! 24bit External |
| notebook, especially the latest Sonoma platform, the | | | | Audigy2 ZS Notebook |
| quality of the audio chip is sufficient to meet the | | | | TerraTec AudiMax 5.1 USB v1.0 INDIGO io |
| everyday needs of most users. But because the size | | | | TerraTec Aureon 7.1 FireWire |
| limit, the internal structure of very compact laptop, the | | | | RMAA is how to assess the sound card? |
| audio part of the circuit and other circuits are also | | | | Before the test, of course you want to install sound |
| close together, like, want to achieve good | | | | card driver, then the audio test line to the sound card |
| anti-electromagnetic interference effects is very | | | | "Line out" and "Line in" Interface connected to form a |
| difficult, in many notebook computers using high-quality | | | | closed loop, then you can begin testing. The test |
| codec chip is no good. | | | | software is a simple test the audio output sound card, |
| On the other hand, notebook computers can only try | | | | enter the property, do not do testing of various audio |
| small speaker and speaker box is not enough space, it | | | | effects, so test drive before you turn off the 3D |
| is difficult to play out the speaker should have the | | | | sound effects, sound effects and other environmental |
| effect, to say nothing of the bass. Like in some | | | | effects. RMAA test results, including frequency |
| well-designed high-end notebook computers use a 4.1 | | | | response, noise level, dynamic range, total harmonic |
| sound system, but the effect is still far from a desktop | | | | distortion, intermodulation distortion and stereo |
| PC. And because laptops are usually only the | | | | separation and so on, following the brief overview of |
| headphone jack, so even with well-designed audio | | | | the implications of these projects. |
| circuitry, can not external speakers for better sound | | | | Frequency Response (Frequency response) |
| quality. | | | | Good frequency response at each frequency point |
| Go? | | | | can output adequate and stable signal, between |
| For desktop machines, the majority of users will opt | | | | different frequency points, the signal size should be the |
| out of cost considerations and will not sound better to | | | | same. However, in practice some of the low and high |
| consider an independent board sound card, so a huge | | | | frequency, signal reconstruction is difficult, so most of |
| price difference and the relatively small difference in | | | | these two intervals will produce sound attenuation, but |
| sound quality so that most people can not accept an | | | | to different degrees. Results from the test curve point |
| independent sound card . Although the desktop | | | | of view, the better the sound card output quality, the |
| machine and sound card there are circuit design and | | | | more flat frequency response curve, and the |
| anti-electromagnetic interference, but much smaller | | | | attenuation of the band closer at both ends of the |
| than notebooks, even one not understand the audio of | | | | horizontal axis. |
| people can easily feel out of the rough notebook audio. | | | | Noise level (Noise level) |
| Transformation of laptop audio, of course start from | | | | This test is mainly the sound card of anti-interference |
| the core of the sound card, but limited to the laptop | | | | ability test, the results can reflect the level of the sound |
| itself features built-in sound card is difficult to achieve | | | | card analog circuit design. The results show a low |
| high standards, HP pavilion dv9000 Battery audio | | | | frequency to HP pavilion DV6 battery frequency |
| manufacturers have seen this, have introduced USB, | | | | sound card from the distribution of noise. Graphic in the |
| IEEE1394 and PCMCIA interface to the external sound | | | | lower position on the vertical axis, the better the |
| card. Notebook audio design is not a breakthrough, we | | | | smaller amplitude. |
| only rely on these products to improve the quality of | | | | Dynamic Range (Dynamic range) |
| their audio output. | | | | Dynamic range is the maximum value of non-distorted |
| It is worth noting, however, this part is more for games | | | | signal and noise ratio, where noise is no signal output |
| and music lovers, enthusiasts and even professionals, | | | | value, the better the value of dynamic range. Usually |
| because they are harsh audio quality requirements. For | | | | the industry used to use the-60dB signal to detect the |
| ordinary users, the majority of high-quality laptop audio | | | | target, because the output level close to full load, THD |
| output quality is acceptable, then these users should be | | | | (total harmonic distortion) will be relatively poor |
| concerned about is that we will be gradually introduced | | | | performance, then overwrites the original harmonic |
| after the two laptop speakers and headphones | | | | generated noise exists, thus affecting test results. The |
| products. | | | | test scores for those who like to enjoy music and |
| What is the AC "97? | | | | video discs of the user is particularly important. |
| Currently, the majority of notebook computers with line | | | | THD (Total Harmonic Distortion) |
| AC "97 standard integrated sound card, the chip most | | | | Total harmonic distortion referred to as THD. |
| of the ESS, Creative, Realtek, and Yamaha offer, of | | | | Generated from the original signal frequency of the |
| which the most widely used products Realtek, then | | | | formation of new non-linear distortion. All are |
| what is the AC" 97 what? | | | | collectively referred to as nonlinear distortion of the |
| In 1996, by Intel, Innovation, NS, Analog Device, and | | | | frequency harmonics (Harmonic), the production of |
| Yamaha and other manufacturers jointly presented 5 | | | | these harmonic frequencies are integer multiples of the |
| Audio Codec "97 (referred to as AC" 97) audio | | | | original signal frequency. For example, 1000Hz harmonic |
| standards. From the initial to the current two-channel | | | | on 2kHz, 3kHz and 4kHz and other locations. Total |
| 8-channel, AC "97 After a total of 4 times the major | | | | harmonic distortion is used to examine the results of |
| changes. | | | | nonlinear distortion, the smaller the value the better. |
| AC "97 1.x: fixed 48kHz sample output; AC" 97 2.1: | | | | IMD (Intermodulation Distortion) |
| expanded part of the audio features, began to support | | | | Intermodulation distortion is a method of measuring |
| a variety of multi-channel sampling rate of output and | | | | nonlinear distortion. Intermodulation distortion from the |
| output; AC "97 2.2: improved and extended some of | | | | two frequency F1 and F2 in F1 + F2 and F1-F2 when |
| the audio features began to support S / PDIF output | | | | the harmonics generated by these harmonics to each |
| (Sony / Philips Digital Interface, Sony Philips Digital | | | | other but also through and, worse to generate new |
| Interface); HD-Audio: Intel latest audio standards used in | | | | frequencies. Such as 12kHz and 13kHz frequency of |
| place of AC "97, supports up to 7.1 surround output, | | | | the harmonic distortion include 1kHz and 25kHz, and |
| and has 32bit/192kHz of high targets, now based on | | | | 1kHz and 12kHz can mix up the frequency of 13kHz |
| the new Centrino platform notebook on the use of | | | | and 11kHz, and so produce more harmonics. Harmonic |
| such audio standards. | | | | measure the size of these locations is the |
| When it comes to AC "97, many people will have a | | | | intermodulation distortion. |
| misconception that AC" 97 refers to the soft sound | | | | Stereo Separation (Stereo crosstalk) |
| card, sound card is in fact now follows the AC "97 | | | | This test will detect the left (right) channel audio, |
| standard. The soft sound card because the codec | | | | "leakage" to the right (left) channel conditions, in the |
| work outside the exchange to the CPU to process | | | | digital signal you want to be 100% of the left and right |
| sound card which omitted many of the original | | | | channel separation is a very simple thing, but we final |
| hardware. in the initial stage, the soft sound card, most | | | | hearing is analog signals, analog signals can not Dell |
| people are skeptical, to eliminate the user's concern | | | | Inspiron 500m battery this ideal state is almost always |
| that such products, although simplifying the hardware | | | | produce some Crosstalk (Crosstalk). The results |
| but still meet the AC "97 standard Therefore | | | | observed curve, the intersection of two curves less |
| manufacturers have highlighted the soft sound card is | | | | appointment. |
| AC "97's. Over time, many people put AC" 97 sound | | | | |