JPH0457943U

JPH0457943U -

Info

Publication number: JPH0457943U
Application number: JP9938990U
Authority: JP
Priority date: 1990-09-21
Filing date: 1990-09-21
Publication date: 1992-05-19

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例のブロツク図、第２
図は従来のテレメトリ受信機のブロツク図である
。１……利得制御増幅器、２，６……位相検波器
、３，５……切換型ループフイルタ、４……電圧
制御発振器、７……９０度移相器、８……振幅検
波器、９……レベル判定回路、１０……ロツク判
定回路、１１……入力端子、１２……位相同期回
路（ＰＬＬ回路）、１３……自動利得制御回路（
ＡＧＣ回路）。 Fig. 1 is a block diagram of an embodiment of the present invention;
The figure is a block diagram of a conventional telemetry receiver. 1... Gain control amplifier, 2, 6... Phase detector, 3, 5... Switching loop filter, 4... Voltage controlled oscillator, 7... 90 degree phase shifter, 8... Amplitude detector, 9 ... Level judgment circuit, 10 ... Lock judgment circuit, 11 ... Input terminal, 12 ... Phase locked circuit (PLL circuit), 13 ... Automatic gain control circuit (
AGC circuit).

Claims

[Claims for Utility Model Registration] 1. A gain control loop that adjusts level changes of a received signal having a carrier wave signal to a constant output level.
automatic gain control means having a switching type loop filter; and a phase synchronization device that inputs the output signal of the automatic gain control means and synchronizes the phase of the oscillation signal of a voltage controlled oscillator provided for phase detection of the input signal. a phase synchronization means having a second switching type loop filter in the loop;
The phase locking means includes a level determination circuit that inputs the output signal of the amplitude detector and determines whether the signal-to-noise ratio within the phase-locked loop is within a predetermined threshold, and A telemetry receiver characterized in that a switching signal representing a determination result of the determination circuit is sent to the first and second switching type loop filters. 2. Telemetry reception according to claim 1, characterized in that said automatic gain control means has a lock determination circuit for determining phase lock of the oscillation signal of said voltage controlled oscillator, and transmits this determination result to said level determination circuit. Machine.