| 摘要 |
<p>The device for the connection of an audiophonic source (1) to the diffusion equipment (2) comprises an input stage (3) for signals forming with reference to a given voltage (Vref), which is 5V. This receives stereophonic signals (CDL, CDR) and the ground (CDGND) from the audiophonic source (1). There is a three lead twisted cable (4) for the transmission of formed signals, and an output stage (5) with an impedance matching section. This provides amplification for the recovery of stereophonic signals (CDL,CDR) from the cable, and delivery to the diffusion equipment (2). The input stage (3) for signals forming comprises a set of 3 operational amplifiers connected for input of stereophonic signals and the ground of the source (1), the outputs connected to the respective leads of the cable (4) via resistors, and the inverted inputs connected to outputs via capacitors and to the respective leads via resistors. The first operational amplifier input is connected to the ground of the source and to the reference voltage (Vref) via a resistor. The second and third operational amplifiers are connected for inputs of stereophonic signals (CDL,CDR), respectively, received via decoupling capacitors and connected to the ground via resistors. The output stage (5) comprises a load stage with 3 resistors in triangular connection, a set of 3 operational amplifiers with inverted inputs connected to outputs via resistors and direct inputs connected to respective leads of the cable via resistors, and a set of 2 operational amplifiers with direct inputs connected to the ground-linked amplifier output of the second set and to the ground via resistors, and the inverted inputs connected via resistors to the outputs of the signals-linked amplifiers of the second set and to the stage outputs recovering the stereophonic signals (CDL,CDR).</p> |
