How to test high quality audio(Hi-Res)?


How to test high quality audio(Hi-Res)?

Hi Res, also known as High Resolution Audio or High Resolution Audio, is not unfamiliar to headphone enthusiasts. Hi Res Audio is a high-quality audio product design standard proposed and defined by Sony, developed by JAS (Japan Audio Association) and CEA (Consumer Electronics Association). The purpose of Hi Res audio is to showcase the ultimate quality of music and the reproduction of the original sound, obtaining a realistic experience of the live performance atmosphere of the original singer or performer. When measuring the resolution of digital signal recorded images, the higher the resolution, the clearer the image. Similarly, digital audio also has its "resolution" because digital signals cannot record linear audio like analog signals, and can only make the audio curve closer to linearity. And Hi Res is a threshold for quantifying the degree of linear restoration. The so-called "lossless music" that we commonly and most frequently encounter is based on CD transcription, and the audio sampling rate specified by CD is only 44.1KHz, with a bit depth of 16bit, which is the highest level of CD audio. And audio sources that can reach the Hi Res level often have a sampling rate higher than 44.1KHz and a bit depth of over 24bit. According to this approach, Hi Res level audio sources can bring richer music details than CDs. It is precisely because Hi Res can bring sound quality beyond the CD level that it is revered by music enthusiasts and a large number of headphone fans.

Hi-Res certification

1. Product compliance testing

The product must meet the technical requirements of Hi Res:

<Simulation process>

Microphone response performance: 40 kHz or higher during recording

Amplification performance: 40 kHz or higher

Speaker and headphone performance: 40 kHz or higher

<Digital Processing>

(1) Recording format: Ability to record using 96kHz/24bit or higher formats

(2) I/O (interface): Input/output interface with a performance of 96kHz/24bit or higher

(3) Decoding: File playability of 96kHz/24bit or higher (requires both FLAC and WAV)

(For self recording devices, the minimum requirement is FLAC or WAV files)

(4) Digital signal processing: DSP processing at 96kHz/24bit or above

(5) D/A conversion: 96 kHz/24 bit or higher analog-to-digital conversion processing

2. Applicant Information Submission

Applicants should submit their information at the beginning of the application;

3. Sign Non Disclosure Agreement (NDA)

Sign a Non disclosure Agreement (NDA) confidentiality agreement with JAS in Japan;

4. Submit due diligence inspection report

5. Video interviews

Video interviews with applicants;

6. Submission of documents

The applicant shall fill out, sign and submit the following documents:

a. Hi Res Logo License Agreement

b. Product Information

c. System details, technical specifications, and measurement data can prove that the product meets the requirements of high-definition audio logos

7. Hi Res logo usage license fee payment

8. Hi Res logo download and use

After receiving the fee, JAS will provide the applicant with information on downloading and using the Hi Res AUDIO logo;

图片 4

Hi-res testing

Complete all processes (including product compliance testing) in 4-7 weeks

BTF Testing Lab, our company has electromagnetic compatibility laboratories, safety regulations Laboratory, wireless radio frequency Laboratory, battery Laboratory, chemical Laboratory, SAR Laboratory, HAC Laboratory, etc. We have obtained qualifications and authorizations such as CMA, CNAS, CPSC, A2LA, VCCI, etc. Our company has an experienced and professional technical engineering team, which can help enterprises solve the problem of Hi-Res testing/Hi-Res certification in a one-stop manner. If you have relevant testing and certification needs, you can directly contact our Testing staff to obtain detailed cost quotations and cycle information!

Post time: May-31-2024