News
"What is Audio Technology Analog Technology"
- Categories:Industry News
- Author:東莞市嘉富盛電子有限公司
- Origin:www.dghcdz.cn
- Time of issue:2018-07-16 22:47
- Views:
"What is Audio Technology Analog Technology"
- Categories:Industry News
- Author:東莞市嘉富盛電子有限公司
- Origin:www.dghcdz.cn
- Time of issue:2018-07-16 22:47
- Views:
Audio active noise reduction technology is favored by consumers. So far, it is mainly used in independent active noise reduction headphones and headsets. Consumers want to be able to enjoy music in a noisy environment, and are willing to buy headphones that can provide this feature.
At present, mobile phone manufacturers around the world are using active noise reduction technology as a major differentiated advantage of their products, providing an excellent audio experience in calls and media consumption. The most economical and convenient way to reduce noise is to build a noise reduction circuit in the phone. However, noise pickup must be implemented on the headset, not on the mobile phone, because the mobile phone may be placed in the user's pocket which may block the noise source.
This brings great difficulty: how to transmit the noise signal of the left and right channels from the earphone to the mobile phone through a standard 3.5 mm audio interface, and at the same time transmit the noise reduction signal from the mobile phone to the earphone. The standard analog audio interface generally has four channels. Two channels are used for the left and right channel speakers, a microphone channel and ground. The microphone channel is also used to power the microphone. When making a call, the microphone transmits the voice signal to the mobile phone.
When the 3.5mm audio interface is used in the traditional analog mode, it is impossible to transmit the noise signal of the left and right channels from the earphone to the mobile phone for processing. Austriamicrosystems has developed a brand-new digital multiplexing technology, in fact, it can create additional channels in the microphone channel. These channels can be used for noise reduction applications, which can transmit the sampled noise of two or four additional left and right channel microphones in the headset to the mobile phone.
In other applications, additional channels can be used to communicate with audio accessories at medium and low data rates, such as adding display functions to accessories, transmitting sensor data, or other additional functions. Of course, the traditional working mode of the audio interface will also be retained, so standard headphones that do not support enhanced features can still be used.
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