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Kota Notani, Takahiro Hayashi, Naoki Mori, Abnormal Sound Detection in Pipes Using a Wireless Microphone and Machine Learning, MATERIALS TRANSACTIONS, 2022, Volume 63, Issue 12, Pages 1622-1630, 2022, https://doi.org/10.2320/matertrans.MT-I2022001., Abnormal sound detection using a one-class support vector machine (OCSVM) and a principal component analysis (PCA) is proposed aiming to stable and objective inspection without skilled plant inspectors. For measurement of acoustic signals, we developed a compact microphone unit that can work in sound detection, signal transmission, and power supply, wirelessly. Six signal parameters were extracted as features from filtered and segmented acoustic signals. Using the features standardized and reduced in dimensionality by PCA, an anomaly detection model using OCSVM is built to detect abnormal sounds. The proposed method is verified by acoustic diagnosis of sound waves leaking from pipeworks with running water. Diagnostic accuracies were evaluated for artificial abnormal sounds with different types of burst waves output from a piezoelectric element attached to the pipe and Pencil Lead Break sound in water flowing background noise. Burst wave changes could be detected in almost all patterns, and the diagnostic accuracy was 100% for the Pencil Lead Break sound.

Kota Notani, Takahiro Hayashi, Naoki Mori, Abnormal Sound Detection in Pipes Using a Wireless Microphone and Machine Learning, MATERIALS TRANSACTIONS, 2022, Volume 63, Issue 12, Pages 1622-1630, 2022, https://doi.org/10.2320/matertrans.MT-I2022001., Abnormal sound detection using a one-class support vector machine (OCSVM) and a principal component analysis (PCA) is proposed aiming to stable and objective inspection without skilled plant inspectors. For measurement of acoustic signals, we developed a compact microphone unit that can work in sound detection, signal transmission, and power supply, wirelessly. Six signal parameters were extracted as features from filtered and segmented acoustic signals. Using the features standardized and reduced in dimensionality by PCA, an anomaly detection model using OCSVM is built to detect abnormal sounds. The proposed method is verified by acoustic diagnosis of sound waves leaking from pipeworks with running water. Diagnostic accuracies were evaluated for artificial abnormal sounds with different types of burst waves output from a piezoelectric element attached to the pipe and Pencil Lead Break sound in water flowing background noise. Burst wave changes could be detected in almost all patterns, and the diagnostic accuracy was 100% for the Pencil Lead Break sound.

To evaluate whether speech recognition in noise differs according to whether a wireless remote microphone is connected to just the cochlear implant (CI) or to both the CI and to the hearing aid (HA) in bimodal CI users. The second aim was to evaluate the additional benefit of the directional microphone mode compared with the omnidirectional microphone mode of the wireless microphone. This prospective study measured Speech Recognition Thresholds (SRT) in babble noise in a ‘within-subjects repeated measures design’ for different listening conditions. Eighteen postlingually deafened adult bimodal CI users. No difference in speech recognition in noise in the bimodal listening condition was found between the wireless microphone connected to the CI only and to both the CI and the HA. An improvement of 4.1 dB was found for switching from the omnidirectional microphone mode to the directional mode in the CI only condition. The use of a wireless microphone improved speech recognition in noise for bimodal CI users. The use of the directional microphone mode led to a substantial additional improvement of speech perception in noise for situations with one target signal.

This project deals with the design of a transmitter in a wireless microphone system, which connects to microphone through the XLR connector. The paper contains description of individual blocks which are necessary for processing and transmitting the signal generated by the microphone, describes methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the choosing of an antenna and its adjustment to appropriate dimensions.

This project deals with the design of a transmitter in a wireless microphone system, which connects to microphone through the XLR connector. The paper contains description of individual blocks which are necessary for processing and transmitting the signal generated by the microphone, describes methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the choosing of an antenna and its adjustment to appropriate dimensions.

This project deals with the design of a transmitter in a wireless microphone system, which connects to microphone through the XLR connector. The paper contains description of individual blocks which are necessary for processing and transmitting the signal generated by the microphone, describes methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the choosing of an antenna and its adjustment to appropriate dimensions.

This project deals with the design of a transmitter in a wireless microphone system, which connects to microphone through the XLR connector. The paper contains description of individual blocks which are necessary for processing and transmitting the signal generated by the microphone, describes methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the choosing of an antenna and its adjustment to appropriate dimensions.

This project deals with the design of a transmitter in a wireless microphone system, which connects to microphone through the XLR connector. The paper contains description of individual blocks which are necessary for processing and transmitting the signal generated by the microphone, describes methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the choosing of an antenna and its adjustment to appropriate dimensions.

This project deals with the design of a transmitter in a wireless microphone system, which connects to microphone through the XLR connector. The paper contains description of individual blocks which are necessary for processing and transmitting the signal generated by the microphone, describes methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the choosing of an antenna and its adjustment to appropriate dimensions.

This project deals with the design of a transmitter in a wireless microphone system, which connects to microphone through the XLR connector. The paper contains description of individual blocks which are necessary for processing and transmitting the signal generated by the microphone, describes methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the choosing of an antenna and its adjustment to appropriate dimensions.

In this contribution the influence of different broadband OFDM schemes on the perceptual audio quality of narrowband wireless microphone links is evaluated, since coexistence scenarios of wireless microphones and Orthogonal frequency-division multiplexing (OFDM) based services arise in the TV bands. Therefore, we present different non-contiguous cyclic-prefix (CP-)OFDM and offset quadrature amplitude modulation (OQAM-)OFDM system designs based on the spectrum pooling concept. We measure their power suppression in the subchannel allocated for the wireless microphone. As an indicator of the perceptual audio quality, we measure the objective difference grade of a colored noise audio signal emitted over a consumerlike hardware. The measurements show that the non-contiguous OQAM-OFDM scheme not only introduces lower interference to the FM link, but also has the advantage of requiring less number of notched carriers in comparison to CP-OFDM. By application of non-contiguous OQAM-OFDM with an appropriate number of notched carriers instead of the classical CP-OFDM scheme, wireless microphone systems can still sustain a significant low SIR when non-professional hardware is applied. © 2013 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

This Paper presents the results of spectral observations in the UHF TV Bands IV and V from 470MHz up to 862MHz with focus on the TV-Channels 61 to 63 and 67 to 69. Concerning the discussions on WRC (2007) this frequency range is in great demand of several applications and is usually treated as a "white space" in the TV-Bands. According to typical scenarios, two different spectral loads will be presented considering the requirements of professional wireless microphone receivers with respect to in-band intermodulation.

Tento semestrální projekt je zameraný na návrh vysielacieho modulu v bezdrôtovom mikrofónovom systéme, ktorý sa pripojí k mikrofónu s XLR konektorom. Obsahuje detailný popis funkcie individuálnych blokov, ktoré sú nutné pre zpracovávanie a vysielanie signálu získaného z mikrofónu. Rozoberá spôsoby frekvenčnej modulácie použitím fázového závesa a porovnáva ich výhody a nevýhody. Ako posledný sa zaoberá s voľbou antény a jej prispôsobením na vhodných rozmerov., This project deals with the design of a transmitter in a wireless microphone system, which connects to a microphone through an XLR connector. It contains detailed description of the individual blocks, which are necessary for processing and transmitting the signal received from the microphone. It discusses methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the antenna selection and its shrinking methods.

Tento semestrální projekt je zameraný na návrh vysielacieho modulu v bezdrôtovom mikrofónovom systéme, ktorý sa pripojí k mikrofónu s XLR konektorom. Obsahuje detailný popis funkcie individuálnych blokov, ktoré sú nutné pre zpracovávanie a vysielanie signálu získaného z mikrofónu. Rozoberá spôsoby frekvenčnej modulácie použitím fázového závesa a porovnáva ich výhody a nevýhody. Ako posledný sa zaoberá s voľbou antény a jej prispôsobením na vhodných rozmerov., This project deals with the design of a transmitter in a wireless microphone system, which connects to a microphone through an XLR connector. It contains detailed description of the individual blocks, which are necessary for processing and transmitting the signal received from the microphone. It discusses methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the antenna selection and its shrinking methods.

Tento semestrální projekt je zameraný na návrh vysielacieho modulu v bezdrôtovom mikrofónovom systéme, ktorý sa pripojí k mikrofónu s XLR konektorom. Obsahuje detailný popis funkcie individuálnych blokov, ktoré sú nutné pre zpracovávanie a vysielanie signálu získaného z mikrofónu. Rozoberá spôsoby frekvenčnej modulácie použitím fázového závesa a porovnáva ich výhody a nevýhody. Ako posledný sa zaoberá s voľbou antény a jej prispôsobením na vhodných rozmerov., This project deals with the design of a transmitter in a wireless microphone system, which connects to a microphone through an XLR connector. It contains detailed description of the individual blocks, which are necessary for processing and transmitting the signal received from the microphone. It discusses methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the antenna selection and its shrinking methods.

Tento semestrální projekt je zameraný na návrh vysielacieho modulu v bezdrôtovom mikrofónovom systéme, ktorý sa pripojí k mikrofónu s XLR konektorom. Obsahuje detailný popis funkcie individuálnych blokov, ktoré sú nutné pre zpracovávanie a vysielanie signálu získaného z mikrofónu. Rozoberá spôsoby frekvenčnej modulácie použitím fázového závesa a porovnáva ich výhody a nevýhody. Ako posledný sa zaoberá s voľbou antény a jej prispôsobením na vhodných rozmerov., This project deals with the design of a transmitter in a wireless microphone system, which connects to a microphone through an XLR connector. It contains detailed description of the individual blocks, which are necessary for processing and transmitting the signal received from the microphone. It discusses methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the antenna selection and its shrinking methods.

Tento semestrální projekt je zameraný na návrh vysielacieho modulu v bezdrôtovom mikrofónovom systéme, ktorý sa pripojí k mikrofónu s XLR konektorom. Obsahuje detailný popis funkcie individuálnych blokov, ktoré sú nutné pre zpracovávanie a vysielanie signálu získaného z mikrofónu. Rozoberá spôsoby frekvenčnej modulácie použitím fázového závesa a porovnáva ich výhody a nevýhody. Ako posledný sa zaoberá s voľbou antény a jej prispôsobením na vhodných rozmerov., This project deals with the design of a transmitter in a wireless microphone system, which connects to a microphone through an XLR connector. It contains detailed description of the individual blocks, which are necessary for processing and transmitting the signal received from the microphone. It discusses methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the antenna selection and its shrinking methods.

Tento semestrální projekt je zameraný na návrh vysielacieho modulu v bezdrôtovom mikrofónovom systéme, ktorý sa pripojí k mikrofónu s XLR konektorom. Obsahuje detailný popis funkcie individuálnych blokov, ktoré sú nutné pre zpracovávanie a vysielanie signálu získaného z mikrofónu. Rozoberá spôsoby frekvenčnej modulácie použitím fázového závesa a porovnáva ich výhody a nevýhody. Ako posledný sa zaoberá s voľbou antény a jej prispôsobením na vhodných rozmerov., This project deals with the design of a transmitter in a wireless microphone system, which connects to a microphone through an XLR connector. It contains detailed description of the individual blocks, which are necessary for processing and transmitting the signal received from the microphone. It discusses methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the antenna selection and its shrinking methods.

Tento semestrální projekt je zameraný na návrh vysielacieho modulu v bezdrôtovom mikrofónovom systéme, ktorý sa pripojí k mikrofónu s XLR konektorom. Obsahuje detailný popis funkcie individuálnych blokov, ktoré sú nutné pre zpracovávanie a vysielanie signálu získaného z mikrofónu. Rozoberá spôsoby frekvenčnej modulácie použitím fázového závesa a porovnáva ich výhody a nevýhody. Ako posledný sa zaoberá s voľbou antény a jej prispôsobením na vhodných rozmerov., This project deals with the design of a transmitter in a wireless microphone system, which connects to a microphone through an XLR connector. It contains detailed description of the individual blocks, which are necessary for processing and transmitting the signal received from the microphone. It discusses methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the antenna selection and its shrinking methods.

Tento semestrální projekt je zameraný na návrh vysielacieho modulu v bezdrôtovom mikrofónovom systéme, ktorý sa pripojí k mikrofónu s XLR konektorom. Obsahuje detailný popis funkcie individuálnych blokov, ktoré sú nutné pre zpracovávanie a vysielanie signálu získaného z mikrofónu. Rozoberá spôsoby frekvenčnej modulácie použitím fázového závesa a porovnáva ich výhody a nevýhody. Ako posledný sa zaoberá s voľbou antény a jej prispôsobením na vhodných rozmerov., This project deals with the design of a transmitter in a wireless microphone system, which connects to a microphone through an XLR connector. It contains detailed description of the individual blocks, which are necessary for processing and transmitting the signal received from the microphone. It discusses methods of frequency modulation using a phase locked loop and compares their advantages and disadvantages. As the last, it deals with the antenna selection and its shrinking methods.

Abnormal sound detection using a one-class support vector machine (OCSVM) and a principal component analysis (PCA) is proposed aiming to stable and objective inspection without skilled plant inspectors. For measurement of acoustic signals, we developed a compact microphone unit that can work in sound detection, signal transmission, and power supply, wirelessly. Six signal parameters were extracted as features from filtered and segmented acoustic signals. Using the features standardized and reduced in dimensionality by PCA, an anomaly detection model using OCSVM is built to detect abnormal sounds. The proposed method is verified by acoustic diagnosis of sound waves leaking from pipeworks with running water. Diagnostic accuracies were evaluated for artificial abnormal sounds with different types of burst waves output from a piezoelectric element attached to the pipe and Pencil Lead Break sound in water flowing background noise. Burst wave changes could be detected in almost all patterns, and the diagnostic accuracy was 100% for the Pencil Lead Break sound., Kota Notani, Takahiro Hayashi, Naoki Mori, Abnormal Sound Detection in Pipes Using a Wireless Microphone and Machine Learning, MATERIALS TRANSACTIONS, 2022, Volume 63, Issue 12, Pages 1622-1630, 2022, https://doi.org/10.2320/matertrans.MT-I2022001.

Kota Notani, Takahiro Hayashi, Naoki Mori, Abnormal Sound Detection in Pipes Using a Wireless Microphone and Machine Learning, MATERIALS TRANSACTIONS, 2022, Volume 63, Issue 12, Pages 1622-1630, 2022, https://doi.org/10.2320/matertrans.MT-I2022001., Abnormal sound detection using a one-class support vector machine (OCSVM) and a principal component analysis (PCA) is proposed aiming to stable and objective inspection without skilled plant inspectors. For measurement of acoustic signals, we developed a compact microphone unit that can work in sound detection, signal transmission, and power supply, wirelessly. Six signal parameters were extracted as features from filtered and segmented acoustic signals. Using the features standardized and reduced in dimensionality by PCA, an anomaly detection model using OCSVM is built to detect abnormal sounds. The proposed method is verified by acoustic diagnosis of sound waves leaking from pipeworks with running water. Diagnostic accuracies were evaluated for artificial abnormal sounds with different types of burst waves output from a piezoelectric element attached to the pipe and Pencil Lead Break sound in water flowing background noise. Burst wave changes could be detected in almost all patterns, and the diagnostic accuracy was 100% for the Pencil Lead Break sound.