With the aid of driving control chip SL811HST, according to the USB1.1 protocol, the firmware of AT89C51SND1 microcontroller accomplishes the enumeration of the USB mass memory device, management of the FAT files, realization of the audio files with suffix MP3, decoding MP3 audio stream into audio signal, transition of the analog and digit and deal of the audio quality.
A Hi-Fi audio coding algorithm based on wavelet transform is designed,this algorithm can compress 705.6kbit/s Hi-Fi audio signals to the bit-rate of 192kbit/s,160kbit/s,128kbit/s,96kbit/s, and 64kbit/s with good audio qualities.
For general unsteady motion of such a filament we give explicit formulas that express the velocity at a given point in terms of the intensity of the free vortices entering the audio signal audibility zone constructed for this point.
The enhancement involves an audio signal scheme based on carrying out overlap-add sinusoidal modeling at three successive time scales, large, medium, and small.
Taking advantage of localization and SNR, the method shows strong robustness against common problems in audio signal processing, random cropping, time scale modification, etc.
The audio signal is first preprocessed to scale down the wavelet coefficients.
A tree-based method for the recognition of the tonal center or key in a musical audio signal is presented.
The output power of the signals is 10 and 75 W, respectively; the gain of the channel amplifiers is 40 dB; and the amplified signals are the video and audio signals of the TV channel 12.
The underlying mathematical concept is approved in the steganography of audio signals [3, 4].
High-quality low-complexity wavelet-based compression algorithm for audio signals
This study examines the applicability of several signal analyzing methods applied to audio signals to establish relationships between audio signals generated during machining and the surface roughness produced.
One-third octave passband filters were also used to condition audio signals acquired during routing of Japanese beech (Fagus crenata Blume) at different machining conditions.
The experimental data reveal a small increase in the duration of the sound signal in proportion to the range with the proportionality factor lower than 0.00025 s/km.
Results of the experimental studies of sound signal propagation in the continental wedge of the northwestern Pacific, near the eastern coast of the Kamchatka Peninsula, are presented.
Experimental studies of the scattering of a monochromatic sound signal by a rough sea surface are carried out.
The second one is the sum of the travel time of the sound signal along the ray cycle and the time delay caused by the side displacement.
A new equation was recently suggested by Rudenko and Robsman  for describing the nonlinear wave propagation in scattering media that are characterized by weak sound signal attenuation proportional to the fourth power of frequency.