It is important to use appropriate functional hearing test to assess whether hearing-impaired people benefit from their cochlear implant or hearing aid. Most well-known standardized function hearing tests are openset sentence or word recognition. However, openset recognition tasks are difficult for hearing-impaired people to administer at home alone since these tasks generally require third-party to perform. While Angel Sound TM is primarily developed for auditory rehabilitation, the CAST technology used in the Angel Sound TM is essentially a perfect self-administered assessment tool for functional hearing test. One of the powerful features in the Angel Sound TM is the seamless integration of speech training and testing function. While many self-administered speech recognition tasks have been implemented in the Angel Sound TM program, most of them are located in the different modules due to the nature of modular implementation. The function hearing test module in the Angel Sound TM is developed to incoporate most commonly used speech and music recognition tasks into a single module so the user can quickly find the appropriate tasks for assessing their functional hearing status. The test module also provides the percentile for the latest test run. For the local version, the ranking is based on the test runs in this local computer. However, for the internet version, the ranking is based on the test runs in the central database (i.e., across all users). Here shows an example of ranking percentile in the Result view. Group 1: Auditory Resolution Tests The Auditory Resolution Test Group is to determine your ability to distinguish sounds differed in one specific domain, such as spectral, tepomral, and amplitudes. The tasks in this group are aimed at assessing the listeners’ ability to discriminate the subtle acoustic difference across among these sounds, which is the foundation for complex speech perception. Psychoacoustic procedure is used to determine the minimal just-noticeable-difference in frequency, gap, and modulation depth. This test group has three different discrimination tests, including 1. Frequency discrimination: The ability to discriminate the difference in spectral domain. The recognition threshold for normal-hearing listener is about 0.5 semitones (due to the limits in the setup, basically the resolution is generally better than 0.5 semitones). 2. Gap detection: The ability to identify the minimal gap between two noise bursts. The recognition threshold for normal-hearing listener is about 2 ms. 3. Temporal modulation detection: The ability to detect the minimal temporal modulation. The recognition threshold for normal-hearing listener is about -25 dB. Group 2: Phoneme Recognition Test The Phoneme Recognition Test Group is to determine your ability to distinguish between phonemes which are the building blocks of language. Commonly used vowel and consonant recognition tests are used in this test group. The tasks in this group are aimed at assessing the ability to discriminate the subtle acoustic difference among different phonemes, which may be the foundation for complex speech perception. This test group has three different identification tests, including 1. Vowel recognition test: The ability to identify 12 different vowels. The expected percent correct should be 100% for normal-hearing listeners. 2. Consonant recognition test: The abiity to identify 20 different consonants. The expected percent correct should be 100% for normal-hearing listeners. 3. Voice gender identification: The ability to identify voice genders of given sounds.The expected percent correct should be 100% for normal-hearing listeners. Group 3: Music Perception Test The Music Perception Test Group is to determine your ability to identify various melodic contours, different music instruments as well as familiar melodies. While a cochlear implant provides many patients with excellent speech understanding in quiet, music perception and appreciation remains a challenge for most cochlear implant users. This test group has three different identification tests, including 1. Music note discrimination test: The ability to detect minimal difference between two music notes. The expected score should be about 0.5 semitones (due to the limits in the setup, basically the resolution is generally better than 0.5 semitones). 2. Melodic contour identification test: The ability to identify nine different melodic contours. The expected percent correct should be 100% for normal-hearing listeners. 3. Musical instrument identification test: The abiity to identify six different instruments. The expected percent correct should be 100% for normal-hearing listeners. 4. Familiar melody identification: The ability to identify 12 familiar melodies without rhythms. The expected percent correct should be 100% for normal-hearing listeners. Group 4: Speech Recognition in Noise Test The Speech Recognition in Noise Test Group is to determine your ability to understand speech in the presence of background noise. Recognition threshold, which is defined as the signal-to-noise ratio that produces 50% of speech recogntion, will be measured. The lower the recognition threshold, the better you can handle conversation in the daily life where noise is always present. This test group has two different identification tests, including 1. Digits in Noise Test: The ability to recognize 3 digits in the presence of speech babble. The expected recognitoin threshold should be about -14 dB for normal-hearing listeners. 2. Keyword in Noise Test: The ability to understand sentence in the presence of speech babble. The program will play IEEE sentences and randomly pick six keywords from various sentences. The listener has to identify the only keyword that has been mentioned in the sentence. The expected recognitoin threshold should be about -15 dB for normal-hearing listeners. Group 5: Auditory Cognition (Working Memory) Test Auditory Cognition Test Group is to asess the listeners’ ability of remembering auditory objects, such digits or different sound patterns. Recognition threshold, which is defined as the number of auditory objects in which the listeners can correctly remember 50% of time, will be measured. The higher the recognition threshold, the better you can remember the auditory objects. The better auditory memory may be related to the better auditory perception. This test group has two different recognition tests, including 1. Forward digit span test: The ability to remember digit sequence in a forward fashion. The expected recognitoin threshold should be about 10 digits for normal-hearing listeners. 2. Backward digit span test: The ability to remember digit sequence in a backward fashion. The expected recognitoin threshold should be about 10 digits for normal-hearing listeners. Group 6: Openset Word Recognition Test Openset recognition test is the ultimate speech recognition test to assess the listeners’ speech understanding in real-life conversation. The traditional openset recognition test generally requires third party to perform the test, which make it difficult to self administer at home. Openset Word Recognition Test Group uses the well-known CNC word list for the test but allow the user to type their response with keyboard or mouse click. This test group has three CNC word lists. Select either list to start the test. After hearing the word, type the word or click the letter in the screen to complete the word. The expected percent correct should be 100% for normal-hearing listeners.