1.MIDI’s original purpose as to allow a musician to control several synthesizers from one keyboard rather than connecting a number of keyboard-equipped synthesizers，to produce the multilayered sound. The MIDI standard provides for 16 channels. You can assign each channel to a specific synthesizer or synthesizer voice.
MIDI原本的目的并不是为了连接许多装备了键盘的合成器来产生多层次的声音,而是为了使音乐家能够用一个键盘控制几个合成器进行演奏。MIDI标准提供16个声道，你可以为每一个声道设置一个特别的合成器或合成器声音。
2.The design of a specific VHF frequency synthesizer and some key techniques in the implement are presented in this paper.
介绍一个专用甚高频频率合成器的设计方案和实施中的一些关键技术．该合成器输出频率范围为99．3MHz～100．7MHz；
3.In this paper, the serial input integratedPLL frequency synthesizer-MB1504 and the commonly-used single chip microprocessor-PIC12C5081509 areintroduced. The size of PIC12C5081509 is minium inthe present world.
介绍了串行输入集成销相频率合成器芯片MB1504和目前国际上体积最小的通用单片机PIC12C508／509，给出了以MB1504和PIC12C508/509为主构成的微型频率合成器设计电路。
4.This paper introduces the principle of phase-locked loop and analyzes the performance characteristics of PLL chip ADF4106 which has wide bandwidth and low power consumption.And then introduces the design method of a kind of low phase noise frequency synthesizers which uses single chip processor to control the chip.The application supplies a good design method for high frequency synthesizer.
介绍了锁相环路的工作原理,分析了低功耗宽带集成锁相环芯片ADF4106的工作特性,并介绍了一种利用单片机控制该芯片的低相位噪声频率合成器的设计方法,讨论了环路滤波器的设计,为高频频率合成器的设计提供了很好的思路。
5.Dueto using advanced MMIC PLL and VCO,the researched frequency synthesizer has smallvolume,fast switching speed and low phase noise.
选用了微波单片PLL频率合成器芯片、单片集成VCO等先进器件，研制的频率合成器具有体积小、捷变速度快、相位噪声低等特点。
6.The Direct Digital Frequency Synthesizer is a kind of fully digitized frequency synthesizer, which consists of the phase accumulator, the sine look-up table, the digital to analog converter and the low band filter. It is of high frequency resolution, fast frequency switching speed, low phase noise, the ability to switch frequencies while maintaining constant phase, and the ability to producing arbitrary waveforms.
直接数字频率合成器(DDS)是一种全数字化的频率合成器，由相位累加器、波形ROM、D／A转换器和低通滤波器构成，DDS技术具有频率分辨率高、频率切换速度快、频率切换时相位连续、输出相位噪声低和可以产生任意波形等优点。
7.Through the research of direct digital synthesizer (DDS) used as a divider in phase lock loop (PLL), a frequency synthesizer with small frequency resolution ratio and high purity frequency spectrum can be realized.
摘要通过对直接数字合成器在锁相环路中作为分频器应用的研究，使频率合成器可以在实现超细频率分辨率的同时达到高的频谱纯度。
8.The timing circuit employed a high speed procession (DSP) TMS320LF2407 as the central control device. A high performance SB3336A/E 3.5G integer-N PLL frequency synthesizer incorporated with operational amplifier and voltage controlled oscillator to form a 1.2G frequency synthesizer. The timing precision can be up to 0.84ns and the corresponding ranging precision is 0.125m.
本电路以高速数字信号处理器(DSP)TFMS320LF2407为核心控制部件,用SB3236A/E高性能2.2G整数-N PLL频率合成器,配以运放、压控振荡器等器件,组成1.2GHz频率合成器,测时精度可达到0.84ns,测距精度可达到0.125m。
9.A novel microwave and millimeter-wave power amplifier/combiner circuit using a magic Tee and a 90°phaseshifiter is proposed. It has the advantages of both 90°shortslot circuit and 180°matched magic Tee circuit. The small signal and large signal charac-teristics of a stable amplification/combination mode of the circuit are thoroghly studied.
提出了一种利用魔T加90°相移器构成微波稳态功率放大／合成器的新方法，它综合了90°Short－slot混合电桥和180°匹配魔T功率放大／合成器电路的优点，对该电路系统在稳定放大／合成模式下的小信号和大信号特性进行了全面的理论分析，得到了许多对实际工程有意义的结论。
10.CORDIC-Based Direct Digital Frequency Synthesizer
基于CORDIC算法的直接数字频率合成器
