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    • 5. 发明授权
    • Method and apparatus for generating comfort noise
    • 产生舒适噪音的方法和装置
    • US06708024B1
    • 2004-03-16
    • US09401088
    • 1999-09-22
    • Philip Chu Wah Yip
    • Philip Chu Wah Yip
    • H04B1700
    • G10L19/012
    • A method and apparatus are provided for generating comfort noise in a communication device. The method includes receiving a signal, scaling the signal to a preselected value, indicating whether an error occurred during transmission of the signal, and providing the scaled signal as an output signal in response to receiving the indication that the error occurred during transmission. The apparatus includes a scaler for receiving a signal and being capable of scaling the signal to a preselected value. The apparatus includes an indicator capable of indicating that an error occurred during transmission of the signal, wherein the scaled signal is provided as an output signal in response to an indication that the error occurred during transmission.
    • 提供了一种用于在通信设备中产生舒适噪声的方法和装置。 该方法包括接收信号,将信号缩放到预选值,指示在信号发送期间是否发生错误,以及响应于接收到在发送期间发生的错误的指示,将缩放的信号提供为输出信号。 该装置包括用于接收信号并且能够将信号缩放到预选值的缩放器。 该装置包括能够指示在信号传输期间发生错误的指示符,其中响应于在传输期间发生错误的指示,将缩放的信号提供为输出信号。
    • 10. 发明授权
    • Method and apparatus for modulating signals
    • 用于调制信号的方法和装置
    • US6151366A
    • 2000-11-21
    • US62253
    • 1998-04-17
    • Philip Chu Wah Yip
    • Philip Chu Wah Yip
    • H04L27/20H04L27/12
    • H04L27/2092H04L27/2017
    • A signal modulator includes a digital signal processor, an address buffer, a counter, and a first memory device. The digital signal processor is adapted to receive digital data at a receive sampling rate and define a code word based on a subset of the digital data. The address buffer is coupled to the digital signal processor and adapted to receive the code word and store a base address. The counter is adapted to increment an address offset at a transmit sampling rate. The transmit sampling rate is a multiple of the receive sampling rate. The first memory device has a plurality of memory locations and is adapted to receive the base address and the address offset and provide a first waveform data sample from the memory location addressed by the base address and the address offset. A method for modulating a signal includes receiving digital data at a receive sampling rate. The time interval between digital data samples defines a bit interval. A code word is determined based on a subset of the digital data. A counter is initialized at the start of the bit interval. The counter is incremented at a transmit sampling rate. An address is determined based on the code word and an address offset stored in the counter. A first memory device containing waveform data is accessed based on the address. A first waveform data sample is output from the first memory device.
    • 信号调制器包括数字信号处理器,地址缓冲器,计数器和第一存储器件。 数字信号处理器适于以接收采样率接收数字数据,并且基于数字数据的子集定义码字。 地址缓冲器耦合到数字信号处理器,并适于接收码字并存储基地址。 计数器适于以发送采样率递增地址偏移。 发送采样率是接收采样率的倍数。 第一存储器件具有多个存储器位置,并且适于接收基地址和地址偏移,并且从由基址和地址偏移寻址的存储器位置提​​供第一波形数据采样。 用于调制信号的方法包括以接收采样率接收数字数据。 数字数据样本之间的时间间隔定义了一个位间隔。 基于数字数据的子集来确定码字。 计数器在位间隔开始时被初始化。 计数器以传输采样率递增。 基于存储在计数器中的代码字和地址偏移来确定地址。 基于该地址访问包含波形数据的第一存储器件。 从第一存储器件输出第一波形数据样本。