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调制解调器是计算机通信的关键部件,对通信信号的传输和接收起着非常重要的作用。目前有些计算机用户对它很感陌生,尤其对调制解调器的位率、波特率、速率以及它们之间如何计算等概念混淆不清,有关书籍对它们的介绍也不多。下面详细介绍一下调制解调器的概念、区别及相互运算关系。1.位率有时称“每秒位”(bps),是对一通信信道里每秒钟所传输数据位数的量度。2.波特率波特率是对每秒内信号在一通信信道中变化或状态发生转换的次数的量度,其中状态可以为频率、电平或相位角等。如果信号变化1次就代表1位,那么波特率的值就等于位率。但是,对于大多数调制解调器而言,波特率与位率并不完全一致。一般来说,波特率要比实际位率低一点,并且速度越快,这种差别越大。大多数调制
Modems are the key components of computer communications and play a very important role in the transmission and reception of communications signals. At present, some computer users are very unfamiliar with it. In particular, the concept of modem bit rate, baud rate, rate and how to calculate them is confused. There are not many books about them. The following details the concept of modem, the difference and the relationship between the operation. 1. The bit rate, sometimes called “bits per second” (bps), is a measure of the number of bits of data transmitted per second in a communications channel. 2. Baud Rate The baud rate is a measure of the number of times a signal changes or changes state per second within a second, where the state can be frequency, level, or phase angle. If the signal changes once represents a bit, then the baud rate value is equal to the bit rate. However, the baud rate and bit rate are not exactly the same for most modems. In general, the baud rate is lower than the actual bit rate, and the faster, the greater the difference. Most modulation