发明名称 |
Variable rate modulator |
摘要 |
Digital data signals at a variable input frequency are converted by a numerically controlled oscillator and an interpolator to a signal at a fixed output sampling frequency. The conversion of the variable input frequency to the fixed output sampling frequency may be by a factor other than an integer. The interpolated digital data signals at the fixed output sampling frequency are then modulated into a pair of trigonometric signals at a programmable carrier frequency, one signal having a cosine function and the other signal having a sine function. The modulated signals at the fixed output sampling frequency are then combined to create a modulated signal at a carrier frequency determined by the frequency of the sine and cosine signals. The modulated signal is sampled at the fixed output sampling frequency and converted to a corresponding analog signal using a digital-to-analog converter.
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申请公布号 |
US6144712(A) |
申请公布日期 |
2000.11.07 |
申请号 |
US19970948101 |
申请日期 |
1997.10.09 |
申请人 |
BROADCOM CORPORATION |
发明人 |
SAMUELI, HENRY;LASKOWSKI, JOSEPH I. |
分类号 |
H04L27/36;(IPC1-7):H04L7/00 |
主分类号 |
H04L27/36 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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