Frequency dynamic correcting method and apparatus
A dynamic correction and frequency technology, applied in signal transmission systems, instruments, non-electrical signal transmission systems, etc., can solve the problems of expensive integrated circuit manufacturing and design, large resistance and capacitance errors, and high cost of quartz oscillators
Inactive Publication Date: 2006-09-20
HOLTEK SEMICON
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Problems solved by technology
In this way, because the cost of the quartz oscillator is high, it will increase the overall manufacturing cost of the product
However, if a less expensive RC oscillator (RC Oscillator) is used in order to reduce the cost, the deviation of the oscillation frequency will be caused due to the large error of the resistance and capacitance; and because the RC oscillator itself is easily affected by Oscillating frequency drift due to changes in external environmental conditions such as temperature
Therefore, in applications that require precise frequency output, product manufacturers need to use more expensive crystal oscillators or additionally use complex circuit designs such as phase lock loops (Phase Lock Loop) to correct the frequency, thus consuming many integrated circuits. and design cost
Method used
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[0022] Generally, the infrared remote controller with time display has a quartz oscillator with a frequency of 32.768KHz because it needs to display the time. This oscillation frequency is very accurate and can be used as a reference frequency for other frequency corrections.
[0023] The carrier frequency of the infrared remote control is generally 37.92KHz or 56.9KHz. Here, 37.92KHz is used as an example for illustration. It is applied to an 8-bit counter. By controlling the interrupt time of the counter, an RC can be adjusted. The output frequency generated by the oscillator source.
[0024] Please refer to figure 1 , which is a schematic diagram of the operating elements of the method of the present invention. Microcontroller (MCU) 1 in the figure can be a reference frequency produced by a quartz oscillator 2 as a standard, and the system frequency produced by a resistance-capacitance (RC) oscillation source 5 formed by a resistance 3 and a capacitance 4 passes through th...
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The dynamic frequency correcting method and device is used in correcting the output frequency of one frequency generator. The dynamic frequency correcting device includes one micro controller with built-in counter and connected electrically to the frequency generator; and one RC vibrator comprising serially connected resistor and capacitor and connected electrically to the micro controller. The micro controller has one reference frequency, and the RC vibrator generates one system frequency, so as to correct one relay time the counter generates corresponding to the system frequency and to regulate the output frequency.
Description
(1) Technical field [0001] The present invention refers to a method and device for dynamic frequency correction, especially a method and device for dynamically correcting output frequency in software. (2) Background technology [0002] For some traditional remote controls of household electrical equipment or industrial equipment, if accurate carrier frequency needs to be generated, quartz oscillator components are generally used. If the device needs functions such as time display or timing, a 32.768KHz crystal oscillator dedicated to real time will be required in addition. In this way, because the cost of the quartz oscillator is relatively high, the overall manufacturing cost of the product will be increased. However, if a less expensive RC oscillator (RC Oscillator) is used in order to reduce the cost, the deviation of the oscillation frequency will be caused due to the large error of the resistance and capacitance; and because the RC oscillator itself is easily affected ...
Claims
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IPC IPC(8): G08C25/00G08C23/04
Inventor 陈俊雄王胜和
Owner HOLTEK SEMICON