Detection of frequency modulation by hearing-impaired listeners: Effects of carrier frequency, modulation rate, and added amplitude modulation

2002 ◽  
Vol 111 (1) ◽  
pp. 327-335 ◽  
Author(s):  
Brian C. J. Moore ◽  
Ewa Skrodzka
Keyword(s):  
Amplitude Modulation ◽  
Frequency Modulation ◽  
Carrier Frequency ◽  
Hearing Impaired ◽  
Modulation Rate

scholarly journals Effects of Age and Hearing Loss on the Discrimination of Amplitude and Frequency Modulation for 2- and 10-Hz Rates

2019 ◽  
Vol 23 ◽  
pp. 233121651985396 ◽  
Author(s):  
Brian C. J. Moore ◽  
Sashi Mariathasan ◽  
Aleksander P. Sęk
Keyword(s):  
Hearing Loss ◽  
Frequency Modulation ◽  
Detection Efficiency ◽  
Normal Hearing ◽  
Hearing Impaired ◽  
Temporal Fine Structure ◽  
Modulation Rate ◽  
Older Subjects ◽  
Stage 1 ◽  
Amplitude And Frequency Modulation

Detection of frequency modulation (FM) with rate = 10 Hz may depend on conversion of FM to amplitude modulation (AM) in the cochlea, while detection of 2-Hz FM may depend on the use of temporal fine structure (TFS) information. TFS processing may worsen with greater age and hearing loss while AM processing probably does not. A two-stage experiment was conducted to test these ideas while controlling for the effects of detection efficiency. Stage 1 measured psychometric functions for the detection of AM alone and FM alone imposed on a 1-kHz carrier, using 2- and 10-Hz rates. Stage 2 assessed the discrimination of AM from FM at the same modulation rate when the detectability of the AM alone and FM alone was equated. Discrimination was better for the 2-Hz than for the 10-Hz rate for all young normal-hearing subjects and for some older subjects with normal hearing at 1 kHz. Other older subjects with normal hearing showed no clear difference in AM-FM discrimination for the 2- and 10-Hz rates, as was the case for most older hearing-impaired subjects. The results suggest that the ability to use TFS cues is reduced for some older people and most hearing-impaired people.

A study of distress calls of song, swamp, and white-throated sparrows (Aves: Fringillidae). II. Interspecific responses and properties used in recognition

1972 ◽  
Vol 50 (12) ◽  
pp. 1513-1525 ◽  
Author(s):  
Raymond A. Stefanski ◽  
J. Bruce Falls
Keyword(s):  
Frequency Modulation ◽  
Carrier Frequency ◽  
Sympatric Species ◽  
The Other ◽  
Breeding Cycle ◽  
Frequency Range ◽  
Distress Calls ◽  
Modulation Rate ◽  
Similar Peak

Recorded distress calls of each species were played to territorial males of the other two, in successive stages of the breeding cycle. Responses were like those given to intraspecific calls and showed a similar peak of intensity in the late nestling and fledgling stage.Song and swamp sparrows (Melospiza spp.) responded strongly to each other's calls, which are alike in length, carrier frequency, and frequency range and overlap broadly in rate of frequency modulation. However, responses were generally weak between Melospiza spp. and the white-throated sparrow (Zonotrichia), whose calls differ in these properties.Song and swamp sparrows responded strongly to artificial sounds that simulated their natural distress calls, but white-throated sparrows responded weakly to sounds that resembled their natural calls in some but not all properties.Song sparrows were exposed to artificial sounds that were varied in length, carrier frequency, and frequency modulation rate. With respect to each property, they responded strongly if the value fell within the range found in natural calls, but weakly if it fell outside this range. Evidently, all three properties are used in call recognition.We conclude that interspecific responses among these sympatric species resulted from similarities in their distress calls. Possible advantages of this behavior are discussed.

Frequency Modulation Detection by Normally Hearing and Profoundly Hearing-Impaired Listeners

1987 ◽  
Vol 30 (4) ◽  
pp. 558-563 ◽  
Author(s):  
Ken W. Grant
Keyword(s):  
Amplitude Modulation ◽  
Frequency Modulation ◽  
Normal Hearing ◽  
Hearing Impaired ◽  
Frequency Difference ◽  
Constant Amplitude ◽  
Modulation Detection ◽  
Frequency Modulation Detection ◽  
Frequency Modulations

The ability of normally hearing and profoundly hearing-impaired subjects to detect frequency modulations was evaluated under conditions where the amplitudes of the test signals were either constant (CA), sinusoidally modulated (SAM), or randomly modulated (RAM). Results for hearing-impaired listeners showed larger frequency difference limens (DLFM) than those for normally hearing listeners for all test frequencies (100 to 1000 Hz) and for all amplitude conditions. For both normal-hearing and hearing-impaired subjects, the DFLM was smallest for the constant amplitude condition and largest for the randomly modulated condition. Differences in performance between the RAM and CA conditions were generally much larger for impaired listeners than for normally hearing listeners. With random amplitude modulation, DLFMs for the hearing-impaired subjects were approximately 36 times larger than those for normally hearing subjects.

Residual amplitude modulation suppression to 6x10-7 in frequency modulation

2021 ◽  
Author(s):  
xinqian guo ◽  
Linbo Zhang ◽  
jun liu ◽  
long chen ◽  
le fan ◽  
...  
Keyword(s):  
Amplitude Modulation ◽  
Frequency Modulation ◽  
Residual Amplitude Modulation

The Response of Nonlinear Systems to Modulated High-Frequency Input

1993 ◽  
Author(s):  
S. A. Nayfeh ◽  
A. H. Nayfeh
Keyword(s):  
Nonlinear Systems ◽  
Natural Frequency ◽  
Amplitude Modulation ◽  
Carrier Frequency ◽  
High Frequency ◽  
Degree Of Freedom ◽  
Resonant Excitation ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Different Types

Abstract We study the response of a single-degree-of-freedom system with cubic nonlinearities to an amplitude-modulated excitation whose carrier frequency is much higher than the natural frequency of the system. The only restriction on the amplitude modulation is that it contain frequencies much lower than the carrier frequency of the excitation. We apply the theory to different types of amplitude modulation and find that resonant excitation of the system may occur under some conditions.

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