What is the behavior of the "Noise Canceling Function" that reports the integrity of BOSE customers?


What is the behavior of the "Noise Canceling Function" that reports the integrity of BOSE customers?

BOSEIs an American company that develops and manufactures headphones and speakers. The BOSE headphonesQuietComfort 35 (QC35)Said that a problem occurred with the "noise reduction function" after updating the firmware.BOSE CommunityMany have been reported above, and the BOSE engineer team has been shown conducting the investigation.

Bose QC 35 Firmware 4.5.2 Noise Cancellation Inves …- Bose Community-285738

BOSE discovered in 2017 that the QC35 firmware version 1.2.9 was reported to have a noise cancellation issue on the forums and fixed the issue in version 1.2.10. Almost no problems were reported after the firmware update, but two years later in 2019, a problem with the noise reduction function was reported again with version 4.5.2, which was a version upgrade completely unrelated to the noise reduction function It is said that it came to be. The contents of the report were "the performance of noise reduction dropped" and "the noise reduction strength could not be adjusted".

BOSE set up an engineering team to check for any changes to the firmware that would affect the noise reduction feature, and found no such changes. He also compared the noise reduction performance between version 4.5.2 and the old version of the firmware, but found no difference.

BOSE has begun to contact the forum members directly to obtain a QC35 that was reported as having problems. As a result, we succeeded in obtaining a small number of QC35s that were actually causing problems. BOSE conducted detailed inspections, A / B tests with different firmware versions, and sound quality evaluations by inspectors, but failed to reproduce the problem or identify the cause.

BOSE will conduct a third party test to solve the problem. Research in acousticsMichael & Associates, And asked them to measure the effect of version 4.5.2 on the noise reduction performance.However, research by research institutes showed that the update to version 4.5.2 significantly deteriorated the noise reduction performance. did not.

BOSE conducted a questionnaire on the forum because it could not identify the cause of the problem through its own research and research institutes, and asked for customers who are having problems with noise reduction and willing to accept home visits Was. As a result, it was possible to conduct a two-hour survey at the customer's home for the five customers who accepted the visit to their home.

During customer visits, interviews on how to use the QC35 by the customer and a total of three QC35s, version 4.1.3 and version 4.5.2 brought by BOSE, and version 4.5.2 QC35 owned by the customer. A / B tests with headphones were performed. BOSE also exchanged the customer's QC35 with a new QC35 at the end of the customer visit and brought back the QC35 owned by the customer and performed detailed hardware analysis.

Through a series of customer visits, it was found that there was no customer firmware update method, Bluetooth pairing method, unintentional noise reduction mode switching, etc. The A / B test also showed no difference in sound quality between headphones.

After the customer visit, in addition to the five QC35s collected, five more QC35s were collected from another customer via telephone. A total of 10 QC35s were subjected to various investigations, such as mechanical tests and evaluations by inspectors, and as a result of the collected 10 QC35s, the performance of the noise reduction function of two QC35s was normal QC35 Turned out to be lower.

Examining the light blue QC35 in the graph indicated that the ear pads were not properly seated. When the ear pads were properly installed, the noise reduction performance was at the same level as normal QC35.

In addition, the gray QC35 in the graph showed mechanical damage, and it was found that third-party ear pads were used. Third-party ear pads are less sealed than genuine ear pads and may have a negative effect on noise reduction. Ultimately, BOSE determined that the reduced performance of the noise reduction feature was due to worn ear pads, the use of third-party products, or mechanical damage.

Although it was not possible to determine the cause of the performance degradation of the noise reduction function caused by version 4.5.2, BOSE, through this survey, learned about headphones use cases and firmware update methods that he did not recognize through this survey. He was able to know. These are apparently being incorporated into BOSE's investigation process as new items.

BOSE will also educate the movie about how to maintain the headphones, how to install the correct ear pads, and how to use genuine ear pads.

Bose QuietComfort 35 II – Troubleshooting Noise Cancellation Issues-YouTube

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There are no known issues with version 4.5.2,Bose UpdaterThere is also an option to downgrade the firmware for a limited time through.

BOSE commented, "We take customer feedback very seriously and work hard to make sure your QC35 is the best product we can make."

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