Abstract: The invention relates to novel urethanases for the enzymatic degradation of polyurethanes and to an enzymatic process for the complete degradation of polyurethanes in defined monomers.

Abstract: A wireless audio monitoring method and a wireless audio system. The wireless audio monitoring method includes: establishing a first communication link between a primary audio device and a sound source device, so that the primary audio device acquires characteristic parameters of the sound source device; using, by the primary audio device, the characteristic parameters of the sound source device to masquerade as the sound source device and become a pseudo sound source device; establishing a second communication link between the pseudo sound source device and a secondary audio device, so that the secondary audio device acquires communication parameters of the first communication link; and monitoring, by the secondary audio device, the first communication link according to the communication parameters of the first communication link. The secondary audio device can acquire part of information in the communication parameters of the first communication link when the second communication link is established.

Abstract: An agent, such as a detergent or cleaning agent, may include a polyesterase. A method for cleaning textiles may include applying the agent to a textile for removing soiling. The polyesterase may also help to reduce pilling effects in the agent.

Abstract: A wireless data transmission method includes sending by an external device a data packet; receiving by a primary device and a secondary device the data packet sent by the external device. When the secondary device does not receive the data packet sent by the external device correctly, sending by the secondary device a feedback signal to the primary device. When the secondary device receives the data packet sent by the external device correctly, not sending the feedback signal. The method further includes detecting by the primary device if the secondary device has sent the feedback signal. When the primary device receives the data packet successfully and detects that the secondary device has not sent the feedback signal, sending by the primary device an ACK signal to the external device; otherwise, sending by the primary device a NACK signal to the external device.

Abstract: A wireless audio monitoring method and a wireless audio system. The wireless audio monitoring method includes: establishing a first communication link between a primary audio device and a sound source device, so that the primary audio device acquires characteristic parameters of the sound source device; using, by the primary audio device, the characteristic parameters of the sound source device to masquerade as the sound source device and become a pseudo sound source device; establishing a second communication link between the pseudo sound source device and a secondary audio device, so that the secondary audio device acquires communication parameters of the first communication link; and monitoring, by the secondary audio device, the first communication link according to the communication parameters of the first communication link. The secondary audio device can acquire part of information in the communication parameters of the first communication link when the second communication link is established.

Abstract: A wireless data transmission method includes sending by an external device a data packet; receiving by a primary device and a secondary device the data packet sent by the external device. When the secondary device does not receive the data packet sent by the external device correctly, sending by the secondary device a feedback signal to the primary device. When the secondary device receives the data packet sent by the external device correctly, not sending the feedback signal. The method further includes detecting by the primary device if the secondary device has sent the feedback signal. When the primary device receives the data packet successfully and detects that the secondary device has not sent the feedback signal, sending by the primary device an ACK signal to the external device; otherwise, sending by the primary device a NACK signal to the external device.

Abstract: An agent, such as a detergent or cleaning agent, may include a polyesterase, as defined herein. A method for cleaning textiles may include applying the agent to a textile for removing soiling. The polyesterase may also help to reduce pilling effects in the agent.

Abstract: An agent, such as a detergent or cleaning agent, may include a polyesterase, as defined herein. A method for cleaning textiles may include applying the agent to a textile for removing soiling. The polyesterase may also help to reduce pilling effects in the agent.

Abstract: An agent, such as a detergent or cleaning agent, may include a polyesterase. A method for cleaning textiles may include applying the agent to a textile for removing soiling. The polyesterase may also help to reduce pilling effects in the agent.

Abstract: Disclosed is a method for low voltage broadband power line carrier communication; when transmitting a physical layer protocol frame, short preambles are first transmitted to undergo automatic gain control, channel estimation, coarse-grained frequency offset compensation, and symbol synchronization; and then long preambles are transmitted to undergo automatic gain control, channel estimation, fine-grained frequency offset compensation, and symbol synchronization. Compared with the scheme of only transmitting long preambles, the present disclosure combines transmissions of short preambles and long preambles, which thus may quickly and accurately implement frequency offset compensation, automatic gain control, symbol synchronization, and channel estimation without sacrifice of precision, thereby achieving quick convergence, reducing resource overheads and time overheads, and enhancing system performance.

Abstract: Disclosed is a method for spreading data symbol frequency domain information in power line carrier communication, wherein when generating a data symbol in power line carrier communication, multiple times of frequency domain information diversity copy is used in place of the conventional ROBO copy, such that the diversity copy is independent of channel time-varying property, but only dependent on channel characteristics; as such, diversity copy is implemented within the same symbol, which facilitates simplifying the processing circuit of frequency domain and meanwhile enhances communication reliability.

Abstract: Disclosed is a method for spreading data symbol frequency domain information in power line carrier communication, wherein when generating a data symbol in power line carrier communication, multiple times of frequency domain information diversity copy is used in place of the conventional ROBO copy, such that the diversity copy is independent of channel time-varying property, but only dependent on channel characteristics; as such, diversity copy is implemented within the same symbol, which facilitates simplifying the processing circuit of frequency domain and meanwhile enhances communication reliability.

Abstract: Disclosed is a method for low voltage broadband power line carrier communication; when transmitting a physical layer protocol frame, short preambles are first transmitted to undergo automatic gain control, channel estimation, coarse-grained frequency offset compensation, and symbol synchronization; and then long preambles are transmitted to undergo automatic gain control, channel estimation, fine-grained frequency offset compensation, and symbol synchronization. Compared with the scheme of only transmitting long preambles, the present disclosure combines transmissions of short preambles and long preambles, which thus may quickly and accurately implement frequency offset compensation, automatic gain control, symbol synchronization, and channel estimation without sacrifice of precision, thereby achieving quick convergence, reducing resource overheads and time overheads, and enhancing system performance.