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Equipment and method for raising precision of time inside system by using negative feedback mode

A time-accurate, negative feedback technology, applied in electrical components, telephone communication, signal generation/distribution, etc., can solve problems such as incorrect bills, and achieve the effect of improving frequency stability and reducing costs

Inactive Publication Date: 2006-07-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the reference source of the clock system comes from the network time service, the stability is very high, but there is a certain transmission delay when it provides time to other modules of the system
In addition, due to frequency division and integer division, interrupt loss, etc., and the system will turn off interrupts when writing to FLASH, etc., there will be a large probability of error bills

Method used

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  • Equipment and method for raising precision of time inside system by using negative feedback mode
  • Equipment and method for raising precision of time inside system by using negative feedback mode

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Embodiment Construction

[0017] The present invention will be described in detail below with reference to the accompanying drawings. The accompanying drawings are only for reference and description, and are not intended to limit the patent scope of the present invention.

[0018] figure 1 A schematic diagram of the device for improving the internal time precision of the system of the present invention is shown. For the crystal oscillator used by the main control CPU, the center frequency stability and power supply voltage fluctuation stability are short-term stability; the annual aging rate is long-term stability. The system clock source used in the system is generally a source with high long-term stability such as a constant temperature crystal oscillator. For the system clock source, the same annual aging rate is long-term stability, while the short-term stability includes system timing delay, transmission interference and other issues in addition to center frequency stability and power supply volt...

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Abstract

The method includes following steps: 1) in the current statistical period, acquires the difference value between the CPU oscillator pulse numbers to get a difference value sequence; 2) the difference value sequence is filtered by a digital low pass filter to get a series of offset; 3) the series of offset is dispersedly compensated into the CPU oscillator pulse in next statistical period in the system clock.

Description

technical field [0001] The present invention generally relates to a device and method for improving the internal time precision of a system, and in particular to a device and method for improving the internal time precision of the system by using a high-precision system clock board through negative feedback. Background technique [0002] On the telephone network, for local calls, PSTN (Public Switched Telephone Network) users generally adopt the double billing method, and ISDN (Integrated Service Network) users adopt the detailed billing method (LAMA). For long-distance calls, both PSTN and ISDN users adopt the detailed billing method (CAMA). Among them, the multiple counting billing method adopts the pulse counting (time counting table jumping table) method for billing. After the exchange receives the called response signal, it sends the billing pulse of the first billing unit, and the number of pulses is determined according to the tariff; later, at the beginning of each ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M15/00G06F1/14
Inventor 刘志兴赵雪剑贾骏祁斌
Owner HUAWEI TECH CO LTD