Telephone Audio Interface


The Inline Patch is a box that connects between the base of an analog or cordless telephone and the wall jack. You can continue to talk on the phone and get access to audio on both sides of the call. The unit’s two back-to-back hybrids give you complete control of audio from both sides of the call. Audio input jacks let you mix sound bytes or music into your conversation. One stereo output jack provides your voice on one channel and the caller's voice on the other channel. A second output jack contains a mix of both voices. Front panel control for each output offers all the control you will need. The Inline Patch will not disrupt your Caller ID or ring signals.

For telecom demo or teleconference presentations, you can use a cordless telephone. Walk around the room and talk over the phone while everyone listens in. Let the audience try your IVR application.

For Radio Stations, the Inline Patch can be used as a simple phone-line hybrid coupler. The Off Hook/Norm switch lets you seize a phone line without using a telephone. This switch can be remote-controlled with a simple contact closure.

The Inline Patch is also perfect for television or cable talk show use, when you may need access to audio from a working telephone on camera.

JK Audio INLINE Features:

  • Works with analog telephones or any cordless telephone
  • XLR input and output jacks
  • Mini stereo output jack, caller on left channel, local voice on right channel
  • Mini output jack, caller and local voice combined on both channels
  • Mini input jack sends signal to phone line
  • Mini jack for remote on-hook / off-hook
  • Front panel Separation control fine tunes voice separation
  • 20 dB nominal separation of phone line transmit / receive audio

    JK Audio INLINE Specifications:

    • Inputs:
      • Balanced in: Female XLR, 1 k ohms, 250 mV RMS (-10 dBm nom.)
      • Line in: 1/8" (3.5mm) mono mini jack, 20 k ohms, 250 mV RMS (-10 dBm nom)
    • Outputs:
      • Balanced out: Male XLR, 50 ohms, 500 mV RMS (+12 dBm max.)
      • Stereo: 1/8" (3.5mm) stereo mini jack, 50 ohms, 250 mV RMS (+12 dBm max.)
      • Mono: 1/8" (3.5mm) stereo mini jack, 50 ohms, 250 mV RMS (+12 dBm max.)
    • Remote: 1/8" (3.5mm) TRS stereo jack. Connect tip to ring to go Off-hook.
    • Phone Line: RJ11C, Isolation 1500 volts
    • Phone: RJ11C, Voltage 32 VDC
    • Power: 16 VAC, 160 mA (120 VAC, UL approved transformer supplied)
    • Size: 6" x 4.75" x 1.65" (15.3 x 12.1 x 4.2 cm)
    • Weight: 1.6 pounds (0.73 kg) with power supply
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