Received signal strength indication link like other metrics such as travel time measurement (time of arrival). Received signal strength indication In telecommunications, received signal strength indicator (RSSI) is a measurement of the power present in a received radio signal. RSSI is usually invisible to a user of a receiving device. However, because signal strength can vary greatly and affect functionality in wireless networking, IEEE 802.11 devices often make the measurement available to users. RSSI is often derived in the intermediate frequency (IF) stage before the IF amplifier. In zero-IF systems, it is derived in the baseband signal chain, before the baseband amplifier. RSSI output
Electronic fluency device like DAF, more effective when presented binaurally. In the last years a number of smart phone apps have been developed that implement DAF/FAF as software and are much cheaper than the special hardware devices, see External links. Studies have shown that altered auditory feedback (including delayed auditory feedback, frequency altered feedback) as provided by devices such as the Casa Futura School DAF machine or SpeechEasy can immediately reduce stuttering by 40 to 80 per cent in reading tasks. Laboratory studies suggest that reductions in stuttering with an electronic fluency device can occur without a reduced speech rate, and that speech