8results about "Signal processing for reducing noise" patented technology

The invention relates to the technical field of digital playing equipment, and provides a lossless control method for the volume of a digital player and the digital player. The method comprises the following steps of: after receiving a target volume parameter, executing dynamic multiplying power oversampling and high-order noise shaping on an input digital audio signal, and injecting preset jitter to suppress in-band quantization distortion so as to generate an optimized digital audio stream; meanwhile, a high-resolution digital reference current control instruction corresponding to the target volume is independently generated, output of a reference current source is adjusted according to the high-resolution digital reference current control instruction, and a high-precision differential current signal is obtained by combining nonlinearity, temperature excursion and quantization errors of a closed-loop feedback compensation device through a multi-bit current segmentation network; performing bias stabilization processing on the signal, and converting the signal into a differential voltage signal for suppressing common-mode noise through a precision differential resistance network; and finally, low-distortion differential analog audio signals capable of directly driving a load are output through low-distortion gain, impedance conversion and power driving, so that low-distortion, high-signal-to-noise-ratio and wide-dynamic-range output in a full-volume range is realized.

A noise cancellation technique is presented with improved frequency resolution. The method includes: acquiring a digitized noise signal from an environment in which the audio signal stream is present; receiving a data sample from the digitized noise signal; appending one or more additional samples to the data sample to form a series of samples, where magnitude for each of the one or more additional samples is substantially zero; computing a frequency domain representation of the series of samples in the frequency domain; shifting the frequency domain representation of the series of samples in time using the digital processor circuit, thereby producing a shifted frequency domain representation of the series of samples; converting the shifted frequency domain representation of the series of samples to time domain to form a portion of an anti-noise signal; and outputting the anti-noise signal into the audio signal stream to abate the noise through destructive interference.

To provide a magnetic recording device capable of improving recording density.SOLUTION: A magnetic recording device 210 includes a magnetic head 110 and a control unit 75. The magnetic head includes a first magnetic pole 31, a second magnetic pole 32, a magnetic element 20 provided between the first magnetic pole and the second magnetic pole, a first terminal T1 electrically connected to the first magnetic pole, a second terminal T2 electrically connected to the second magnetic pole, and a coil 30c. The control unit is electrically connected to the first terminal, the second terminal, and the coil. One end of the magnetic element is electrically connected to the first magnetic pole. The other end of the magnetic element is electrically connected to the second magnetic pole. The control unit can perform a recording operation. In the recording operation, the control unit supplies a recording current to the coil while applying an element voltage of a first voltage or more and a second voltage or less between the first terminal and the second terminal.SELECTED DRAWING: Figure 1

The invention relates to the technical field of recording pen design, in particular to a recording system and method based on wireless communication and recording equipment, and the system comprises a microphone module which is used for receiving to-be-processed analog audio and converting the to-be-processed analog audio into to-be-processed digital signals; the processor module is used for receiving the to-be-processed digital signal and performing signal processing based on the to-be-processed digital signal so as to generate an audio digital data packet; and the antenna module is used for sending an audio digital data packet and receiving an instruction, and transmitting the audio digital data packet to the man-machine interaction equipment by adopting a preset Bluetooth protocol so as to display the audio in real time. According to the invention, the audio digital data packet which is convenient to store and automatically played can be obtained, so that automatic playing while recording can be realized, and the practicability of the recording equipment is improved.

This invention relates to the field of noise reduction technology, and in particular to an intelligent noise reduction mode switching method and system. The method involves: acquiring real-time environmental data of the user device's current environment after recording begins; analyzing the real-time environmental data using a noise level assessment model to obtain the real-time noise level of the user device's current environment; correlating the real-time noise level with the amplitude of noise signal changes in the real-time environmental data; inputting the real-time environmental data into an environmental scene recognition model to obtain the real-time scene type corresponding to the user device's current environment; and automatically switching the user device to the corresponding target noise reduction mode based on the real-time noise level and the real-time scene type to ensure the recording quality of the user device. By analyzing environmental data from different perspectives through the noise level assessment model and the environmental scene recognition model, environmental adaptability is improved, noise reduction effect is enhanced, and recording quality is ensured to be unaffected by environmental changes.

The invention discloses a method for optimizing steel wire recording digital audio quality, which comprises the following steps of: S1, measuring abrasion of a main shaft and a belt pulley of a steel wire recorder, and adjusting a tolerance to be within an original design range; s2, the magnetic head is cleaned through ultrasonic waves, and metal coating is conducted again; s3, controlling power supply voltage fluctuation by adding a voltage stabilizer; s4, analyzing the audio signal in combination with a spectrum analysis tool, separating distortion and noise components, and performing noise reduction processing by using a spectrum De-Noise technology and a dynamic threshold value; and S5, expanding a frequency range through a Spectral Recovery technology, and carrying out equalization compensation on the signal by using MusicRebalance. According to the method, mechanical structure optimization, magnetic head performance recovery, power system stability improvement and a digital audio processing technology are combined, so that the digital audio quality of steel wire recording is remarkably improved, the sound quality of recording is optimized, noise interference of equipment is reduced, and audio playback is clearer and more real.

Various embodiments of the present invention provide a method and a device, the device comprising a microphone, a communication module, a memory comprising a transmission buffer, and a processor operatively connected to the microphone, the communication module, or the memory, wherein the processor is configured to establish a connection of a first communication link with a first external electronic device through the communication module, establish a connection of a second communication link with a second external electronic device through the communication module, acquire a microphone input signal by operating the microphone upon reception of a recording request from the first external electronic device, monitor a transmission environment with the communication module or the second external electronic device, determine a bit rate of audio, based on the transmission environment, encode the audio, based on the determined bit rate, and transmit the encoded audio data to the first external electronic device. Various embodiments are possible.