A Linear Variable Differential Transformer (LVDT) is disclosed which addresses measurement errors arising out of the resistance in the VDT coil windings.
Linear variable differential transformer (LVDT) systems having both of the following characteristics
A monolithic interface circuit for use with a linear variable differential transformer (LVDT) position transducer.
The apparatus can also be implemented as a Rotary Variable Differential Transformer (RDVT).
A linear variable differential transformer (54) measures the diameter of the tubing (26) subject to the pumping action.
The LVDT comprises current sensing means for sensing when the currenir flowing in the LVDT coil is zero.
Two echo cancellers (30, 32) are used within the phone to reduce the echo produced by the impedance mismatch of a 4-to-2 wire hybrid (44) and the dedicated handset (16).
The subscriber (101) and called party (106) are connected to EOs (112 and 114) which each comprises a hybrid (202 or 204), DTMF detector (222), and switch matrix (211 or 215), respectively.