The Bluetooth voice remote control has gradually replaced the traditional infrared remote control, and has gradually become the standard equipment of today's home set-top boxes. From the name of "Bluetooth Voice Remote Control", it mainly involves two aspects: Bluetooth and voice. Bluetooth provides a channel and a set of transmission protocols for voice data transmission, and voice realizes the value of Bluetooth. In addition to voice, the buttons of the Bluetooth voice remote control are also transmitted to the set-top box through Bluetooth. This article summarizes some basic concepts of Bluetooth voice remote control.

1. The location of the "Voice" button and the microphone hole of the Bluetooth voice remote control

One difference between the Bluetooth voice remote control and the traditional infrared remote control in terms of buttons is that the former has an additional "voice" button and a microphone hole. The user only needs to hold down the "Voice" button and speak into the microphone. At the same time, the microphone will collect the user's voice and send it to the set-top box for analysis after sampling, quantization, and encoding.

In order to get a better near-field voice experience, the layout of the "Voice" button and the position of the microphone on the remote control is particular. I have seen some voice remote controls for TVs and OTT set-top boxes, and their "voice" keys are also placed in various positions, some are placed in the middle area of ​​the remote control, some are placed in the top area, and some are placed in the upper right Corner area, and the position of the microphone is generally placed in the middle of the top area.

2. BLE 4.0~5.3

The Bluetooth voice remote control has a built-in Bluetooth chip, which consumes more power than the traditional infrared remote control. In order to prolong the life of the battery, the Bluetooth voice remote control generally chooses the BLE 4.0 or higher standard as the technical implementation standard.

The full name of BLE is "BlueTooth Low Energy". From the name, it can be seen that low power consumption is emphasized, so it is very suitable for Bluetooth voice remote control.

Like the TCP/IP protocol, BLE 4.0 also specifies a set of its own protocols, such as ATT. Regarding the difference between BLE 4.0 and Bluetooth 4.0 or the previous Bluetooth version, I understand it like this: the version before Bluetooth 4.0, such as Bluetooth 1.0, belongs to traditional Bluetooth, and there is no design related to low power consumption; from Bluetooth 4.0 At first, the BLE protocol was added to the previous Bluetooth version, so Bluetooth 4.0 includes both the previous traditional Bluetooth protocol and the BLE protocol, which means that BLE is a part of Bluetooth 4.0.

Pairing connection status:

After the remote control and the set-top box are paired and connected, the two can transmit data. The user can use the remote control keys and voice keys to control the set-top box. At this time, the key value and voice data are sent to the set-top box through Bluetooth.

Sleep state and active state:

To prolong battery life, when the remote control is not used for a period of time, the remote control will automatically go to sleep. During the sleep period of the remote control, by pressing any button, the remote control can be activated, that is to say, the remote control can control the set-top box through the Bluetooth channel at this time.

Bluetooth key value definition

Each button of the Bluetooth voice remote control corresponds to a Bluetooth key value. There is an international organization that defines a set of keys for keyboards, and the term is keyboard HID keys. You can use this set of keyboard HID keys as Bluetooth keys.

The above is a summary of the basic concepts and technologies involved in the Bluetooth voice remote control. I will briefly share it here. Welcome to ask questions and discuss together.