At present, there are many Bluetooth headset products on the market, but there are relatively few Bluetooth speakers. The so-called Bluetooth speaker actually refers to a speaker that relies on the Bluetooth transmission protocol as a carrier for data transmission. Since most mobile devices (mobile phones, notebooks, tablet computers) are equipped with Bluetooth chips, no data cable or audio cable connection is required. Quick identification, simple operation and convenient connection.
From the perspective of sound quality, the effective audio data volume of CD sound quality data (44.1KHz sampling rate, 16bit sampling accuracy) is about 1.4Mbit. To transmit CD sound quality music signals, the transmission rate only needs to be maintained at 2Mbit per second. Bluetooth The "2.1 + EDR" specification is sufficient. Moreover, since such products often follow the mature acoustic structure of traditional speakers, the wireless playback is realized after the integration of the Bluetooth module, and the sound quality performance is equivalent to that of the same level of speaker products.
From the specification point of view, although the Bluetooth 3.0 / 4.0 standard has been proposed, the former is mainly reflected in the Bluetooth radio frequency modulation method is in line with Wi-Fi, the latter is reflected in the application of automatic power control, that is, low power consumption, from this The two versions reflect the advancement of Bluetooth technology, but have little contact with audio applications. From the perspective of chip-level applications, it is suitable for 3.0 / 4.0 version.
The mainstream Bluetooth speakers all use the A2DP stereo protocol. In 2012, smartphones, tablets, and other devices all supported the A2DP protocol, so from the perspective of use, the Bluetooth speakers have no obstacles at all.