LKS-2-A1 ListenTALK Base-8 System
Furnish a portable assistive listening system for use by the hearing-impaired. The system shall be capable of operating on the 1.9 GHz unlicensed PCS band utilizing Frequency-Hopping Spread Spectrum (FHSS) techniques allowing interference free full duplex communication. The devices shall employ a multiply layer security protocol consisting of a 40-bit (pin free) group subscription, 32-bit authentication and a 64-bit encryption scheme enabling secure conversations. They shall be easy to pair and form groups via Near-field communication (NFC), Docking Station or Software Suite. The system devices shall be simple to operate with a Power, Talk and Volume Up and Down buttons. The devices shall allow up to 10 simultaneous groups to operate in the same area. They shall be powered via a removable non-proprietary rechargeable lithium-ion battery or via an optional 3 AAA alkaline battery compartment.
The system devices shall have a 3.5 mm TRRS CTIA compliant headset connection allowing operation with a standard electret style headset. They shall have a built-in-microphone with auto detect circuitry if users elect to use their personal ear buds. They shall have a 64 x 128 OLED display with auto diming allowing display of all current status (group name, volume levels, mute, battery status, time remaining, signal strength, unit ID, mode, etc.) The devices shall have a leader clip and when inserted the unit automatically designates itself as a leader and allows the leader/presenter to control pairing/group creation and leader talkback modes (listen only, leader only or group).
The system devices shall have a signal-to-noise ratio of 70 dB or greater and shall have an audio frequency response of 40 Hz – 15 kHz (±3 dB). The devices shall incorporate automatic battery charging circuitry to charge and maintain the lithium-Ion battery either via the micro USB port or via the docking station using the additional charging contacts on the bottom of the devices.
The LKS-2 ListenTALK Base-8 System is specified.