Abstract:
PURPOSE: A key transceiving method using frequency band division is provided to assign transmission key bits to each divided band, and to forcibly insert intrinsic frequency components to transmit and receive data. CONSTITUTION: A transmitter generates a key to be transmitted(S201), and forcibly inserts preset spectrum coefficients into a corresponding band according to a bit value(S203). The transmitter scrambles the entire transmission bandwidth to safely transmit a key bit(S205), and converts into a time area signal by performing an IFFT process(S206). The transmitter changes the signal into an analog signal to transmit the analog signal(S207,S209). A receiver receives the analog signal(S211), performs an A/D conversion(S213), and carries out an FFT process(S215). The receiver descrambles displaced frequency coefficients into an original position(S216). The receiver extracts energy information of a spectrum, decides whether the assigned key bit is '0' or '1'(S217), and restores entire key bits(S219).
Abstract:
따라서, 송신모드시음성부호화를통해전송비트수를최소화하여채널전송에서발생하는오류를감소시킬수 있으므로, 아날로그음성신호를아날로그무전기로직접전송하는경우에비해통화품질을개선시킬수 있다. 또한, 수신모드시채널복호화를통해채널전송에서발생한오류를정정할수 있으므로열악한채널에서운용되는아날로그무전기의통화품질을크게개선시킬수 있다.
Abstract:
PURPOSE: An apparatus for improving channel quality of analog radio is provided to reduce an error in channel transmission by minimizing a transmission bit number through a voice encoding operation in a transmission mode. CONSTITUTION: In a transmission mode, a transmission signal processor(250A) converts an analog voice signal of a transmission party into a digital signal through a voice input unit(220). The transmission signal processor modulates the digital signal into an analog signal after voice encoding and channel encoding. In a reception mode, a reception signal processor(250B) demodulates the analog voice signal of a reception party into the digital signal. After channel decoding and voice decoding, the reception signal processing unit converts the digital signal into the analog signal.
Abstract:
PURPOSE: An apparatus and method for voice communication are provided to maintain a good quality of voice and reliable transmission by protecting a voice signal of a user in an end-to-end method. CONSTITUTION: An audio input part(210) is inputted with an analog voice signal corresponding to a communication session. An AD converter(220) changes the voice signal into a digital signal. A transmission synchronous processing part(240) generates a transmission object signal by allocating a start identifier and a termination identifier to an initial frame and a last frame of the digital signal corresponding to the communication session, respectively. A channel state determination part(260) determines a channel condition which transmits the transmission object signal. A transmission part(270) transmits the transmission object signal to a channel by setting a transfer rate of the transmission object signal as a communication session unit according to the channel condition. [Reference numerals] (210) Audio input part; (220) AD converter; (230) Encoding part; (240) Transmission synchronous processing part; (250) Cipher processing unit; (260) Channel state determination unit; (270) Transmission unit; (300) Channel
Abstract:
본 발명은 유무선 융합용 정보 보호 단말기 및 정보 보호 통신 방법에 관한 것으로, 사용자 데이터를 입력 받는 입력부, 사용자 데이터에 포함된 음성 신호 또는 영상 신호를 디지털 신호로 변환하는 신호 변환부, 복수의 통신 인터페이스에서 제공하는 각 통신 방식에 대응하는 암호 알고리즘을 구비하고, 디지털 신호로 변환된 사용자 데이터를 선택된 통신 방식에 대응하는 암호 알고리즘을 이용하여 암호화한 출력 데이터를 생성하는 암호화 처리부, 서로 다른 복수의 통신 인터페이스들을 구비하고, 복수의 통신 인터페이스 중 암호화 처리부에서 선택된 통신 방식을 지원하는 통신 인터페이스를 통해 테더링 단말기 또는 인터넷 망에 접속하는 망 접속부; 및, 및 출력 데이터를 패킷화하여, 망 접속부를 통해 접속된 테더링 단말기 또는 인터넷 망을 통해 수신측 단말기로 출력 데이터를 전송하는 송신 처리부를 포함한다.
Abstract:
본 발명은 통신 시스템에서 하나의 통화모드에서 음성과 데이터를 동시에 전송할 수 있는 시스템 및 그 방법에 관한 것으로서, 음성신호 압축을 위하여 EVRC 보코더를 사용하는 통신 시스템에서 음성통화 중에 다양한 형태의 사용자 데이터를 묵음구간에서 생성되는 rate 1/8 패킷에 효과적으로 삽입하여 전송하도록 구성함으로써, EVRC 보코더가 적용된 통신 시스템에서 음성통화 중에 통화품질의 저하나, 전송대역의 추가 없이 다양한 형태의 사용자 데이터를 전송할 수 있으며, 정보보호 관점에서 음성 데이터 내에 다양한 형태의 비음성 데이터를 은닉/전송함으로써 통화자 쌍방을 제외한 제 3자에게 비음성 데이터의 전송사실을 은닉할 수 있는 효과가 있다. EVRC 보코더, 묵음구간, rate 1/8, 통화중 데이터 전송, 데이터 은닉
Abstract:
An apparatus and a method for processing data by using a packet of an EVRC(Enhanced Variable Rate Codec) vocoder in a mobile communication system are provided to conceal transmission of non-voice data to a third party except for speakers by inserting non-voice data into a voice packet and transmitting it. When an inputted voice call state is a voice interval, an EVRC vocoder encoder(405) generates rate 1 and 1/2 packets. and when the inputted voice call state is a mute interval, the EVRC vocoder encoder(405) generates a rate 1/8 packet. An insertion module(404) inserts the user data to the rate 1/8 packet. A transmission module(407) transmits the data-inserted rate 1/8 packet to a channel.
Abstract:
PURPOSE: An FFT(Fast Fourier Transform) scrambling and descrambling method is provided to firstly scale an amplitude of an FFT signal in a transmitter, and to scramble a position of a frequency component, in order to modulate an amplitude of the frequency component, thereby reducing residual intelligibility for an original signal. CONSTITUTION: A scrambling process(20) is performed as follows. An analog signal(201) is sampled to a sampling frequency, and is converted into a digital signal(202). An FFT processor binds digitally converted data in certain blocks, performs an N-point FFT process, and converts the data into a frequency region signal(203). A scaling table(220) is multiplied by a frequency component, and an amplitude scaling operation(204) is carried out to generate an amplitude-modulated signal. A position component of the frequency region signal is replaced(205), and an N-point inverse FFT process is performed(206). The signal becomes a real number sequence signal, and is converted into the analog signal(207), then is transmitted(208).