EDR stands for Enhanced data rate, which is the abbreviation of enhanced data rate in Bluetooth technology. Its characteristic is to greatly increase the data transmission rate of Bluetooth technology to 2.1Mbps, which is three times that of current Bluetooth technology.
Bluetooth headset manufacturers have noticed that in the Bluetooth 2.0 specification, EDR appears as a supplement. It correctly defines changes in modulation technology and additional packet types, which enable it to transmit at a rate of 3MBPS. So, we usually look at What came up was the phrase "Bluetooth Core Specification Version 2.0 + EDR". The actual situation is that there is currently no Bluetooth application that requires more than 1MBPS for transmission. Even for high-quality stereo data streams, it must use subband codec; SBC codec, which requires 345KBPS at most.
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However, due to the increasing popularity of Bluetooth devices, users may use multiple Bluetooth devices at the same time. Especially in a computer environment, there may be mouse, keyboard, headset, mobile phone, PDA, printer and other devices that need to work at the same time. EDR provides additional bandwidth for Bluetooth radio, so that all devices have a satisfactory transmission rate. If users want to listen to high-quality stereo sound effects, they need a data transfer rate of 345 kbps instead of the medium-quality transfer rate of 237 kbps. High-quality audio streaming will take up 53% of the bandwidth, plus 22% of the bandwidth required by the mouse and keyboard, leaving only 25% of the bandwidth. This is not enough for retransmission. Used. Moreover, if the communication interference is severe, the 25% bandwidth will be even more insufficient.
If you switch to EDR, you can solve the above-mentioned problems. In the EDR communication environment, Bluetooth headset manufacturers believe that the mouse and keyboard still maintain a maximum bandwidth consumption of 11%. However, high-quality audio streams now only occupy 18% of the bandwidth. Therefore, the bandwidth can be left. Down 60%. Even in the case of severe interference, the communication performance can still be easily maintained at an acceptable level. This can also provide enough bandwidth for other additional applications, such as printing files or synchronizing data.
In addition to supporting high-quality audio streams, DR can also help reduce power consumption. The amount of power required by the Bluetooth radio frequency is determined by the length of time it is in the active mode. Because EDR increases the data transmission rate by a factor of three, the length of time that the Bluetooth radio frequency is in working mode is now only 1/3 of the past, and the required power is only 1/3 of the past.
EDR is 100% compatible with Bluetooth version 1.2. Bluetooth headset manufacturers believe that backwards compatibility is always emphasized when developing EDR. The Bluetooth network allows devices with EDR capabilities and devices with a standard transmission rate (1 Mbps) to coexist. The new modulation design is also compatible with the standard transmission rate, so both parties can receive the signal transmitted by the other party. This means that when designing a product with EDR function, it will not be more complicated than designing a Bluetooth version 1.2 product.