ELECTRONICS Ltd
WiSp Specification
Wireless Speaker System
WiSp is a wireless audio link system that provides CD quality audio transmission over distances of up to 300m (open range). Using 2.4GHz transmission frequency WiSp offers total flexibility by allowing multiple transmitters and receivers to coexist in proximity, units are configurable to allow an infinite number of receivers per transmitter and error free robust digital links maintained by software ‘quality of service’ functions.
2.4GHz digitally encoded audio link
1.5Mbps data rate
Low latency (user settable 20ms, 25ms, 32ms or 64ms)
Balanced line level stereo audio inputs (transmitter)
Unbalanced RCA stereo audio inputs (transmitter)
Balanced line level audio outputs (receiver)
Mute and volume control at both transmitter and receiver
Robust metal enclosure
20Hz – 20kHz frequency response
16 bit, 48kHz sampling
<0.03% THD (Total Harmonic Distortion)
The TX always operates in fixed mating ID mode. The RX can operate in either fixed mating ID mode or dynamic bonding mode, as selected on DIP switch 8 of the RX. For a TX and RX to communicate in fixed mating ID 20 ms stereo mode, the mating ID on each unit must match. Set the mating ID of each unit using the first 4 DIP switches
The manual Mating ID off 2-point system control setting is only in use when the Bond Mode DIP switch is set to the "Fixed on 3-point local control Mating ID" position, not "Dynamic Bonding Mode".
The selection of a low buffer size minimizes the time delay from audio transmission to audio reception; whereas, the selection of a high buffer size maximizes the quality of service (QoS) between the TX and RX. To change the audio buffer size of the system, set the 2 DIP switches labeled 5 and 6 on the TX unit as shown in the table.
indicates
default setting
To set the system configuration to 2-point (1Tx & 1 Rx) or to 3-point (1Tx & 2Rx), set the DIP switch labeled 7on the TX unit. The TX and RX each have a "Bond" pushbutton for the purpose of establishing a new dynamic bond between the TX and RX. When the RX is operating in dynamic bond mode then press the “BOND” button to request the RX bond with another TX within its local range.
To select the type of receivers that is allowed to receive wireless audio from the TX, set with the DIP switch labeled "8", in the “CONFIGURATION” panel on the TX unit as shown in the table. When the DIP switch 8 is set to OFF then the TX will only allow one RX (i.e. 1Rx in 2-point mode, or 2Rx in 3-point mode) to actively bond and receive wireless audio. When the DIP switch is set to "Active & Passive Rx" then the TX will also allow an infinite number of RXs in passive-listener mode to receive wireless audio from it.
The system wide audio volume or the local RX audio volume can be controlled by the “Vol+” and “Vol-“ buttons depending on the RX volume mode set by the DIP switch. Press the button to increase the audio volume level. Likewise, press the Vol- button to decrease the audio volume level.
To change the RX volume mode, set the DIP switch labeled “7” on RX units. In system mode, the volume up and down buttons changes the system-wide audio volume level. In local mode the volume buttons only change the local RX audio volume level.
Each Rx can be set up to output 2-channel left and right stereo audio, left-channel audio only, right channel-audio only, or mono audio only (averaged the left and right channels). To change the RX “Receive Audio Mode” set the 2 DIP switches labeled "5" and “6” on the RX unit in the “CONFIGURATION” panel.
The system-wide audio output or the local RX audio output can be muted by the “MUTE” button, in the following cases:
When an RX is in System Volume mode (by DIP switch setting) then the RX can be muted by pressing the “MUTE” button on the RX, the bonded TX, or the other RX in a 3-point system.
When an RX is in Local Volume mode then the RX can only be muted by pressing the “MUTE” button on the RX. Other RXs in the system are not muted.
When the mute button is pressed on a TX then all the RXs that are in “System Volume Mode” are muted, and all RX’s that are in “Local Volume Mode” are not muted. In each case a second press on the “MUTE” button enables audio output.
1. Auto mute occurs during RF interference.