[blackcat] L1 Ehlers FM Demodulator

19 may 2021

Level: 1

Background

John F. Ehlers introuced FM demodulator of "A Technical Description Of Market Data For Traders" on TASC MAY 2021

Function

John Ehlers introduces the use of FM modulation to determine the cycles of market data. The author also proposes that noise in market data does not necessarily mean chaos and that pink noise in the data implies memory in the data. According to the author, peaks and valleys of the FM demodulator indicator that he presents in the article can be correlated with major swings of the price. The FM demodulator indicator (FMD) ranges from -1.0 to 1.0. There is a natural delay in the detection of peaks and troughs, as we need to wait while the indicator has moved by a certain amount. The example system buys as soon as a new higher trough has been confirmed.

Key Signal

SS --> FM Demodulator ouput

Pros and Cons

100% John F. Ehlers definition translation, even variable names are the same. This help readers who would like to use pine to read his book.


Remarks

The 103rd script for Blackcat1402 John F. Ehlers Week publication.


Readme

In real life, I am a prolific inventor. I have successfully applied for more than 60 international and regional patents in the past 12 years. But in the past two years or so, I have tried to transfer my creativity to the development of trading strategies. Tradingview is the ideal platform for me. I am selecting and contributing some of the hundreds of scripts to publish in Tradingview community. Welcome everyone to interact with me to discuss these interesting pine scripts.

The scripts posted are categorized into 5 levels according to my efforts or manhours put into these works.

Level 1 : interesting script snippets or distinctive improvement from classic indicators or strategy. Level 1 scripts can usually appear in more complex indicators as a function module or element.

Level 2 : composite indicator/strategy. By selecting or combining several independent or dependent functions or sub indicators in proper way, the composite script exhibits a resonance phenomenon which can filter out noise or fake trading signal to enhance trading confidence level.

Level 3 : comprehensive indicator/strategy. They are simple trading systems based on my strategies. They are commonly containing several or all of entry signal, close signal, stop loss, take profit, re-entry, risk management, and position sizing techniques. Even some interesting fundamental and mass psychological aspects are incorporated.

Level 4 : script snippets or functions that do not disclose source code. Interesting element that can reveal market laws and work as raw material for indicators and strategies. If you find Level 1~2 scripts are helpful, Level 4 is a private version that took me far more efforts to develop.

Level 5 : indicator/strategy that do not disclose source code. private version of Level 3 script with my accumulated script processing skills or a large number of custom functions. I had a private function library built in past two years. Level 5 scripts use many of them to achieve private trading strategy.