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Signal modulation method

A modulation method and signal technology, applied in amplitude modulation carrier systems, improving amplifiers to reduce nonlinear distortion, etc., can solve the problems of signal distortion, low efficiency, technical difficulties in power amplifier implementation, etc., to avoid distortion, avoid low efficiency and high efficiency. Distortion effect

Inactive Publication Date: 2011-05-04
AAC TECH PTE LTD +1
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Problems solved by technology

[0006] However, in this method, the audio signal becomes an amplitude modulated signal after being processed by a modulator, and the amplitude modulated signal becomes an analog signal through digital-to-analog conversion, which will cause signal distortion, which poses extremely high demands on the audio digital-to-analog converter. The frequency band requirements, and the power amplifier used for this signal amplification is technically difficult to realize, and the efficiency is low

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] see figure 1 , a signal modulation method provided by the present invention, the modulation method is used in a modulation device, the modulation device is used to convert the received audio signal into a pulse signal of high frequency and equal width, and the modulation device includes an analog-to-digital converter and a modulation The audio signal is an analog signal, which is converted into a digital signal in the analog-to-digital converter and then enters the modulator, which is output as a high-frequency equal-width pulse signal through the modulator;

[0025] The method comprises the steps of:

[0026] Set the carrier frequency of the parameter array to f 0 ,

[0027] The audio signal S is converted into a digital audio signal S by an analog-to-digital converter d After entering the modulator, after being processed by the modulator, i...

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Abstract

The invention provides a signal modulation method which is used for a modulation device. The modulation device is used for converting a received audio signal into a high-frequency pulse signal with equal width. The modulation device comprises an analog to digital converter and a modulator; the audio signal is an analog signal and enters the modulator after being converted into a digital signal inthe analog to digital converter; and the digital signal is output as the high-frequency pulse signal with equal width by the modulator. The method comprises the following steps: the carrier frequencyof a parameter array is set to f0; after the audio signal S is converted into a digital signal by the analog to digital converter, the digital signal enters the modulator; and after being processed by the modulator, the digital signal is changed into the high-frequency pulse signal with equal width and varied intervals. The method can reduce distortion.

Description

【Technical field】 [0001] The invention relates to a signal modulation method. 【Background technique】 [0002] Modulation technology is a technology that converts baseband signals into transmission signals, including baseband signals and (high frequency) carrier signals; the principle is to use baseband signals to control the parameters (amplitude, frequency and phase) of high frequency carriers, so that these parameters follow the baseband signal Variety. The modulated signal can realize long-distance transmission, and can improve the anti-interference ability of the signal at the same time. [0003] The modulation method is divided into analog modulation and digital modulation according to the nature of the modulation signal. [0004] Among them, the AM (amplitude modulation) method in the existing communication is mainly based on analog modulation and amplification. The analog modulation system has the advantages of fast response and small distortion; at the same time, i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/04H03F1/32
Inventor 冯声振张丽宏徐斌
Owner AAC TECH PTE LTD