Abstract: A non-coherent detection apparatus includes, inter alia, a correlation unit, a frequency offset estimator, and a signal detector. The correlation unit obtains a differential phase signal by multiplying a complex conjugate value of a delay signal obtained by delaying a received signal by (N+1) chips by the received signal, sums-up resultant values obtained by multiplying each component of the differential phase signal by each component of a correlation sequence and outputs a correlation signal. The frequency offset estimator estimates a frequency offset based on a value obtained by accumulatively summing-up the correlation signals corresponding to preamble portions of the received signal. The signal detector detects an original signal from the received signal based on a size of a real-number part of a resultant value obtained by multiplying the frequency offset estimated by the frequency offset estimator by the correlation signal corresponding to a PHY payload portion of the received signal.

Abstract: Disclosed is an adaptive multimedia decoding device and method for scalable satellite broadcasting. A TS decoder TS-decodes a first transmission stream and a second transmission stream received through different transmission bands to generate a first video stream, a second video stream, and an audio stream. A first decoder and a second decoder are configured of a plurality of operation modules that are sequentially performed so as to decode the first video stream, the second video stream, and the audio stream and are independently controlled and are operated in parallel. A controller compares the amount of data corresponding to one input unit of the first video stream and the second video stream input to each of the first decoder and the second decoder, to selectively perform each operation module configuring the first decoder and the second decoder whenever the data corresponding to one input unit are input.

Abstract: A non-coherent detection apparatus and method for an IEEE 802.15.

Abstract: A method and apparatus for shaping quantization noise generated when compressing audio data at a low bit rate is disclosed. A predetermined quantization noise threshold allowed during quantization of sampled audio data and quantization noise energy information of a quantized MDCT coefficient are received in all frequency bands of an audio frequency. The quantization noise energy of the quantized MDCT coefficient is attenuated in a predetermined number of frequency bands in which a difference between the predetermined quantization noise threshold and the quantization noise energy of the quantized MDCT coefficient is large.

Abstract: A method and apparatus for shaping quantization noise generated when compressing audio data at a low bit rate is disclosed. A predetermined quantization noise threshold allowed during quantization of sampled audio data and quantization noise energy information of a quantized MDCT coefficient are received in all frequency bands of an audio frequency. The quantization noise energy of the quantized MDCT coefficient is attenuated in a predetermined number of frequency bands in which a difference between the predetermined quantization noise threshold and the quantization noise energy of the quantized MDCT coefficient is large.

Abstract: An apparatus and method for encoding audio data with a small amount of computation are provided. The audio data encoding apparatus includes: a time-to-frequency converting unit that receives a time domain audio signal and converts the same to a frequency domain audio signal; a spectral processor that performs spectral processing on the frequency domain audio signal; a masking threshold calculator that calculates an energy level for each frequency band of the frequency domain audio signal, approximates an energy distribution curve connecting the calculated energy levels to a distribution pattern similar to that of noise threshold levels calculated by a conventional psychoacoustic model, and calculates a scalefactor band gain for each band; and a quantization noise curve adjuster that adjusts a common gain to meet a target bit rate and matches a quantization noise curve to the approximated energy distribution curve while fixing the scalefactor gain for each frequency band.

Abstract: The present invention relates to a data conversion method for providing efficient conversion between data of different unit lengths, a method for obtaining waveform information from a square wave using the same, and a method for generating the square wave from the waveform information using the same. According to the data conversion method of the present invention, there is an advantage in that data compression and data decompression can be readily and efficiently performed. Further, according to the method of obtaining the waveform information and the method of generating the square wave using the data conversion method of the present invention, there are advantages in that the waveform information can be efficiently generated from the square wave signal and the square wave signal can be efficiently generated from data on the waveform information of the square wave.