发明名称 |
Digital broadcasting receiving unit and digital broadcasting system |
摘要 |
This invention provides a digital broadcasting receiving unit capable of achieving synchronization of time information between a base station and a receiving unit with reference clock without use of a crystal oscillator (VCXO) having a variable frequency. The crystal oscillator oscillates a clock of a predetermined fixed frequency. A variable digital dividing circuit divides a fixed frequency by a division ratio so as to change the division ratio. A system decoder detects reference time information from the base station. A reference counter generates time information of a receiving unit. A phase comparator detects a difference between reference time information and time information. A division ratio control circuit controls the change of the division ratio based on the difference. The reference counter generates time information based on a clock having a frequency obtained by dividing by the variable digital dividing circuit and feeds back time information to the phase comparator.
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申请公布号 |
US2007253493(A1) |
申请公布日期 |
2007.11.01 |
申请号 |
US20070785406 |
申请日期 |
2007.04.17 |
申请人 |
RENESAS TECHNOLOGY CORP. |
发明人 |
SHIROTA HIROSHI;SAITO TADASHI;ITO KAZUYUKI;OKUDA RYOSUKE;ARAMOTO MASAO |
分类号 |
H04B1/66;H03L7/00;H04B1/16;H04N5/44;H04N7/173 |
主分类号 |
H04B1/66 |
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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