JPH0170450U

JPH0170450U -

Info

Publication number: JPH0170450U
Application number: JP1987166466U
Authority: JP
Priority date: 1987-10-29
Filing date: 1987-10-29
Publication date: 1989-05-10

Description

[Brief explanation of the drawing]

第１図は本考案のＦＳＫ変調器の系統図、第２
図は従来のＦＳＫ変調器の系統図である。１……電圧制御発振器、２……混合器、３……
可変分周器、４……位相比較器、５……低減ろ波
器、６……分周器、７……混合器、８……帯域通
過ろ波器、９……ＦＳＫデータ入力、１０……周
波数偏移制御データ入力、１１……変調器出力。 Figure 1 is a system diagram of the FSK modulator of the present invention;
The figure is a system diagram of a conventional FSK modulator. 1... Voltage controlled oscillator, 2... Mixer, 3...
Variable frequency divider, 4... Phase comparator, 5... Reducing filter, 6... Frequency divider, 7... Mixer, 8... Band pass filter, 9... FSK data input, 10 ...Frequency shift control data input, 11...Modulator output.

Claims

[Scope of utility model registration request]

A voltage controlled oscillator whose oscillation frequency changes depending on an input control voltage, a mixer that mixes the output of this voltage controlled oscillator and a first local signal, and a mixer that mixes the output of this mixer with input data marks, spaces and A variable frequency divider that divides the frequency at different division ratios depending on frequency shift control data, a phase comparator that detects the phase difference between the output of this variable frequency divider and a reference signal, and a a frequency reduction filter that removes a component of the reference signal to generate the control voltage; and a frequency divider that divides the output of the voltage controlled oscillator by a frequency division ratio that differs depending on the frequency shift control data;
An F comprising a mixer that mixes the output of this frequency divider and a second local signal, and a bandpass filter that removes spurious components from the output of this mixer.
SK modulator.