This indicator created by Price Headley is described in his book “Big Trends in Trading“. It acts as a enveloppe bands indicator. It can be used in any timeframe on typical 20 and 80 periods. It is more effective on stocks trading. The wider the bands are, greater is the volatility and you should expect trend continuation.
Buy signals are taken while the price make consecutive upper bands piercing.
upper = (High*(1+2*(((High-Low)/((High+Low)/2))*1000)*0.001))
lower = (Low*(1-2*(((High-Low)/((High+Low)/2))*1000)*0.001))
BUP = average[20](upper)
BDOWN = average[20](lower)
RETURN BUP as "Upper Acceleration Band", BDOWN as "Lower Acceleration Band"