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公开(公告)号：EP0391524A3
公开(公告)日：1992-08-12
申请号：EP90301658.2
申请日：1990-02-15
IPC分类号： H04M1/50
CPC分类号： H04M1/505
摘要： A method and apparatus for generating dual tome multiple frequency signals employing a low frequency quartz oscillator, wherein a phase accumulation dual tone multiple frequency generator is comprised of a low frequency quartz oscillator. Two phase selectors are connected to produce digital phase signals in response to a signal input. Two phase accumulators, each composed of an adder and a register, are connected to accumulate the phase signals. Two ROM based sine wave tables are addressed by the outputs of the accumulators. An adder adds the outputs of the ROMs, and a D/A converter produces an analog output from the output of the adder.
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3.发明公开Phase accumulation dual tone multiple frequency generator 失效Doppeltonvielfachfrequenz-Generator mit Phasen-Anhäufung。
公开(公告)号：EP0391524A2
公开(公告)日：1990-10-10
申请号：EP90301658.2
申请日：1990-02-15
IPC分类号： H04M1/50
CPC分类号： H04M1/505
摘要： A method and apparatus for generating dual tome multiple frequency signals employing a low frequency quartz oscillator, wherein a phase accumulation dual tone multiple frequency generator is comprised of a low frequency quartz oscillator. Two phase selectors are connected to produce digital phase signals in response to a signal input. Two phase accumulators, each composed of an adder and a register, are connected to accumulate the phase signals. Two ROM based sine wave tables are addressed by the outputs of the accumulators. An adder adds the outputs of the ROMs, and a D/A converter produces an analog output from the output of the adder.
摘要翻译： 一种使用低频石英振荡器产生双重多频信号的方法和装置，其中相位累积双音多频发生器由低频石英振荡器组成。 两个相位选择器被连接以响应信号输入产生数字相位信号。 连接由加法器和寄存器组成的两个相位累加器，以累加相位信号。 两个基于ROM的正弦波表由累加器的输出来寻址。 加法器将ROM的输出相加，D / A转换器从加法器的输出产生模拟输出。
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