Abstract: A stringed musical instrument is disclosed herein. The stringed instrument comprises a body, a head, a neck, and one or more strings. The neck has a back plate and a cover integrated with the back plate. The back plate comprises a first array of openings and the cover comprises a second array of openings. The first array and second array of openings align to form an array of light housings. Each light housing is configured to house a light (e.g., LEDs). Also disclosed herein is an interactive stringed musical instrument teaching system comprising a stringed instrument and a mobile terminal (e.g., computer). Both the smart stringed instrument and the mobile terminal are in communication via one or more communication modules. The mobile terminal comprises a microphone, a tuning module, a database, a teaching module and a game module. The stringed instrument comprises a main control module, a sound wake-up module, an LED driver module and an LED matrix module.

Abstract: A method for precoded communications includes precoding in a first stage, outgoing data streams with first precoding matrices generated in accordance with instantaneous channel feedback received from receiving devices, wherein a configuration of the instantaneous channel feedback is determined in accordance with statistical channel information and individual of the receiving devices, thereby producing first precoded data streams, precoding in a second stage, the first precoded data streams with second precoding matrices generated in accordance with the statistical channel information associated with the receiving devices, thereby producing second precoded data streams, and transmitting the second precoded data streams to the receiving devices.

Abstract: Systems and methods are provided for multimedia processing. For example, an encoded file is acquired; the encoded file is parsed to obtain application-indication information and watermark-indication information associated with the encoded file; a multimedia-recording application associated with the application-indication information is called; watermark information is generated based on at least the watermark-indication information; the watermark information displayed on a recording interface of the multimedia-recording application; and in response to multimedia information being generated on the recording interface of the multimedia-recording application, the watermark information and the multimedia information is integrated.