Filters 2

Fundamentals of Electronic Communications The basic principles of filters and radio frequency (r.f.) oscillators

Block diagrams of filters-Band pass

Block diagrams of filters - bandstop ,[object Object]

Bell or Peak/Dip EQ Curve Controls ,[object Object],[object Object],[object Object],[object Object]

Bandwidth and Q ,[object Object],Source: Modern Recording Techniques, Huber

Bandwidth and Q ,[object Object],[object Object],[object Object],[object Object],[object Object]

Filter EQ Curves ,[object Object],[object Object],[object Object],[object Object]

Low Pass Filter ,[object Object],[object Object],[object Object],[object Object],Source: www.harmony-central.com

HPF has a turnover frequency (at -3 dB) of 700 Hz. Slope = 6 dB / octave LPF has a turnover frequency of 700 Hz. Slope = 12 dB / octave Source: Modern Recording Techniques, Huber & Runstein

Filter Controls ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

EQ Bands ,[object Object],[object Object],[object Object],[object Object],[object Object]

What is a Crossover? ,[object Object]

How it works ,[object Object]

3 types of crossover filters ,[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object]

Slope ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object]

- 6db - 12db - 18db - 24db - 48db 500hz 250 K hz 125hz 1Khz 63hz

Crossover Point ,[object Object],[object Object],[object Object],[object Object]

Cutoff Frequency ,[object Object],[object Object]

Decibel (dB) (1) Power Gain in dB : (2) Voltage Gain in dB : (P=V 2 /R) By Definition:

[object Object],where L is the inductance in henries , and C is the capacitance in farads

Parallel LC Resonant Circuit ,[object Object],[object Object],[object Object],[object Object],[object Object],Q = quality factor = f 0 /  f 3dB = resonance frequency / width at –3 dB points (Remember that at –3 dB point, V out / V in = 0.7 and output power is reduced by ½ ) Q is a measure of the sharpness of the peak For a parallel RLC circuit:

Oscillation in Parallel LC Resonant Circuit ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The impedance of this circuit is : Z has a maximum when The resonance frequency of the parallel LC circuit I has a maximum when

Oscillators ,[object Object],[object Object],[object Object]

Application of Oscillators ,[object Object],[object Object],[object Object],[object Object],[object Object]

Radio-Frequency Amplifiers ,[object Object],[object Object],[object Object]

Narrowband Amplifiers ,[object Object],[object Object],[object Object]

Filters 2

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