Abstract: This application provides information processing methods, apparatuses, and devices. One method includes: obtaining a first password and a first random number, generating a first acknowledgment code of a first node based on the first password and the first random number, and sending the first acknowledgment code and the first random number to a second node. The foregoing method facilitates password authentication and improves authentication efficiency.

Abstract: An audio data transmission method includes encapsulating, based on a physical layer frame header, a protocol data unit (PDU) including audio data, to obtain an audio data packet, where the physical layer frame header is modulated using a first digital modulation scheme, the PDU is modulated using a second digital modulation scheme, a value of a modulation rate of the first digital modulation scheme is equal to a value of a data transmission rate, and a value of a modulation rate of the second digital modulation scheme is less than the value of the data transmission rate, and sending the audio data packet on a BLUETOOTH low energy (BLE) physical channel at the data transmission rate.

Abstract: This application provides a communication method and apparatus, to resolve a problem that an amount of data transmitted by a sharing device per unit of time is limited and a sharing distance is short, thereby improving data quality and increasing a quantity of shared devices. The communication method and apparatus may be applied to a communication system. The method includes providing a communication method. The method is applied to a forwarding device. The communication method includes: The forwarding device receives sharing indication information from a terminal device. The sharing indication information indicates to share first data, and the first data is to-be-shared data of the terminal device. The forwarding device obtains the first data, and sends the first data to a plurality of receiving devices based on the sharing indication information.

Abstract: An audio data transmission method includes encapsulating, based on a physical layer frame header, a protocol data unit (PDU) including audio data, to obtain an audio data packet, where the physical layer frame header is modulated using a first digital modulation scheme, the PDU is modulated using a second digital modulation scheme, a value of a modulation rate of the first digital modulation scheme is equal to a value of a data transmission rate, and a value of a modulation rate of the second digital modulation scheme is less than the value of the data transmission rate, and sending the audio data packet on a BLUETOOTH low energy (BLE) physical channel at the data transmission rate.

Abstract: Embodiments of this application disclose a pairing method applied to a short-range communication system and a wireless device in the field of wireless communication. The method includes: obtaining, by a first wireless device, a first password, where the first password is shared by the first wireless device and a second wireless device; and pairing, by the first wireless device, with the second wireless device based on a password-based authenticated key exchange (PAKE) protocol and by using the first password as an encryption password in a key exchange process.

Abstract: An audio data transmission method includes encapsulating, based on a physical layer frame header, a protocol data unit (PDU) including audio data, to obtain an audio data packet, where the physical layer frame header is modulated using a first digital modulation scheme, the PDU is modulated using a second digital modulation scheme, a value of a modulation rate of the first digital modulation scheme is equal to a value of a data transmission rate, and a value of a modulation rate of the second digital modulation scheme is less than the value of the data transmission rate, and sending the audio data packet on a BLUETOOTH low energy (BLE) physical channel at the data transmission rate.

Abstract: A method, a Bluetooth device, and a computer-readable medium provides transmission rate switching applied to a first device that communicates with a second device through a Bluetooth physical channel. The method includes: determining a link quality of the Bluetooth physical channel; determining based on a preset correspondence between link quality and a transmission rate, target transmission rates corresponding to the link quality, the target transmission rates including a first sending rate and a second sending rate; setting a rate of sending information to the second device through the Bluetooth physical channel to the first sending rate; and sending first control information to the second device, the first control information indicating to indicate the second device to set a rate of sending information to the first device through the Bluetooth physical channel to the second sending rate. This can quickly complete transmission rate switching, and reduce signaling overheads.

Abstract: An audio data transmission method includes encapsulating, based on a physical layer frame header, a protocol data unit (PDU) including audio data, to obtain an audio data packet, where the physical layer frame header is modulated using a first digital modulation scheme, the PDU is modulated using a second digital modulation scheme, a value of a modulation rate of the first digital modulation scheme is equal to a value of a data transmission rate, and a value of a modulation rate of the second digital modulation scheme is less than the value of the data transmission rate, and sending the audio data packet on a BLUETOOTH low energy (BLE) physical channel at the data transmission rate.

Abstract: This invention relates to a catalyst for ammonia synthesis. The main phase of the catalyst is a non-stoichiometric ferrous oxide expressed as Fe.sub.1-x O, which is structurally in a Wustite crystal phase form having the rock salt face-centered cubic lattice with lattice paracueter of 0.427-0.433 nm. This catalyst, which has quick reduction rate and high activity, and remarkably lowers the reaction temperature, is especially applicable as an ideal low-temperature, low-pressure ammonia synthesis catalsyt and can be widely used in ammonia synthesis industry.