Digital Product Direction Guide, Detailed Interpretation of DXOMark Quality Evaluation Criteria

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Digital Product Direction Guide, Detailed Interpretation of DXOMark Quality Evaluation Criteria

2022-01-15 06:02:48 21 ℃

Friends who often pay attention to consumer electronics should be unfamiliar with DXomark. This is a French company focused on the quality evaluation of the consumer electronics, audio, screen, batteries. Starting with the camera and smartphone to make a good authority and recognition in the industry. In order to meet the pursuit of consumers, the agency currently launched an audio score system. Let's take a look at how it comes to sound quality.

DXOMark's audio evaluation system mainly refers to the audio subjective perceived standard attribute defined by the International Telecommunications Union (ITU-R BS.2399-0), contains five large dimensions of tone, strength, spatial feel, volume and sound loss. In each big dimension, there is a number of subdids. At the same time, the test cases of life scenes are introduced throughout the evaluation process, covering the scenarios of users using speakers in various scenarios. Finally, take the subjective score and objective score of each sub-attribute in each test case, and the complex weighted algorithm aggregate the attribute score (eg, intensity or sound damage) and the use case score (e.g., a bathroom, deactivated or outdoor). Then, the total device score is composed of these sub-scores.

We have chosen a smart speaker with a higher heat in the market. Take the Huawei Sound X Bluetooth Speaker as an example, this product is divided into 126 points in DXomark Speaker. In the sound part, Huawei Sound X has a deep low frequency extended, equalized overall tone and clear and accurate treble. In addition, in [push-push] symmetrical acoustic design, it shows an excellent impact and the real 360 ° sound field, the volume consistency is very good, and the time domain sound loss is not reached.

Next, let's see how each subdix is ​​evaluated. The first is the sound dimension, the main evaluation of the bass of the equipment, the intermediate, treble, and sound balance. By measuring the frequency rare curve, the objective playback capability of the equipment is objectively characterized to a certain extent. Then, the senior acoustic engineer is listened in accordance with the subjective evaluation example in various scenarios, and the integrated score is given. In order to ensure that the score results of different devices can perform lateral contrasts, the devices close to the performance are selected as an anchor, and the devices to be tested and the anchor device are compared.

I have seen the sound, how about the interaction of the speaker? We evaluate speakers in transient, bass precision, and impact characteristics, which is mainly evaluated by subjective listening. As can be seen from the score, Huawei Sound X exhibits strong transient and impact, but because of the influence of low frequency resonance and distortion, the bass accuracy and clarity will be slightly somewhat.

In the spatial sense of the speaker, the playability of the stereo source in each direction can be evaluated, and the positioning capacity, the balance, the wide distance, and directionality can be considered. The radar map is used to evaluate the directivity of the speaker low, medium and high frequency. As can be seen from the figure below, in the case of the small and medium volume, both the listener is in the vicinity of the speaker, Huawei Sound X can present a fairly consistent sound. However, in the large volume scenario, the medium high-frequency resonance exists in the device affects the direction, especially when standing on both sides of the speaker.

For the volume of our frequently regulated volume, the overall loudness of the device and the smoothness of the user adjust the volume of the user can be evaluated by objective measurement. The volume curve of objective measuring equipment, measures the user's perception of the user during volume adjustment based on the linearity of the curve. In addition, according to different music style types, the test sound source is divided into different subsets, and the Sound stage meter is used to play the A-rolling sound pressure of the above subset of the above-mentioned subsets for evaluation of the maximum loudness of the equipment.

The sound loss is a problem that most users are concerned, and the devices can be evaluated at the time of playing the test sound source and various types of noise (bottom noise, clipping noise, etc.). When evaluating the sound loss, first through the visibility of the THD + N curve for a certain extent, the total harmonic distortion is given, and then determines the distortion, bottom noise, and noise in the field of use.

In summary, DXOMark follows the main objective combination of the subject of sound quality, give full play to the advantages of subjective perception and objective physical quantity measurement, and reasonable selection of equipment proximally as an anchor, so that the final evaluation result has good repeatability. And availability, it is possible to measure relative sorting between the audio devices more accurately.

For friends who pay attention to sound quality, everyone can use the DXOMark sound quality evaluation standard as a reference when purchasing electronic devices. But because of the sense of listening is strong, it is recommended that everyone will experience the actual purchase experience of the store to find the products you like.