会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 9. 发明授权
    • Method of and means for processing an audio frequency signal to conceal
intelligility
    • 用于处理音频信号以隐藏清晰度的方法和装置
    • US4126761A
    • 1978-11-21
    • US767904
    • 1977-02-11
    • Daniel GraupeDavid L. CohnG. Donald Causey
    • Daniel GraupeDavid L. CohnG. Donald Causey
    • H04K1/02
    • H04K1/02
    • An input audio frequency analog signal, for example, speech, which is to be passed through a noisy transmission channel, is scrambled at the sending end by repetitively performing a modulo-v (MOD v) addition of an n-level, m-pulse codeword with an n-level digitized transformation of the input signal under the condition that m and v are integers. The resultant sum signal, after transmission through a noisy channel (which may be an acoustic medium, a conventional telephone link, a conventional CB radio link, etc.), is received at the receiving end and descrambled. Descrambling is achieved by carrying out a Mod v subtraction process involving repetitively subtracting the same codeword from an n-level digitized transformation of the received signal, the subtraction being carried out in synchronism with the addition at the sending end. The resultant difference signal is a representation of the input signal and is relatively insensitive to noise present in the transmission channel.
    • 要通过噪声传输信道的输入音频模拟信号(例如语音)在发送端通过重复执行n级m脉冲的模v(MOD v)加法来加扰 在m和v为整数的条件下具有输入信号的n级数字化变换的码字。 通过噪声信道(其可以是声学介质,常规电话链路,常规CB无线电链路等)传输之后的结果和信号在接收端被接收并被解扰。 通过执行Mod v减法处理来实现解扰,该处理涉及从接收信号的n电平数字化变换重复地减去相同的码字,所述减法与发送端的相加同步地执行。 所得到的差分信号是输入信号的表示,并且对于存在于传输信道中的噪声相对不敏感。