Abstract: An earphone device having a concentrating tube includes an annular magnet, a first yoke, a second yoke, a concentrating tube, a speaker assembly, and a passive diaphragm. The first and second yokes are respectively connected to first and second magnetic pole faces of the annular magnet. The concentrating tube is received in a central through hole of the annular magnet. The concentrating tube includes first and second open ends. The speaker assembly includes a voice coil and an active diaphragm. The passive and active diaphragms are at two opposite ends of the concentrating tube. The active and passive diaphragms are respectively close to the first and second open ends. A gas flow generated by the active diaphragm is gathered by the concentrating tube and pushes the passive diaphragm. A gas flow generated by the passive diaphragm returns through the concentrating tube to push the active diaphragm and transmits acoustic waves.

Abstract: An acoustic adjusting system includes an audio device and an earphone device. The audio device includes an acoustic adjusting module, an audio player, and a first communicating unit. The acoustic adjusting module generates an acoustic setting data; the audio player generates an audio signal; and the first communicating unit receives the acoustic setting data and the audio signal, and then outputs the acoustic setting data and the audio signal. The earphone device includes a second communicating unit, an erasable acoustic data memory, a digital signal processor, and an electroacoustic transducer. The acoustic setting data is stored in the erasable acoustic data memory by erasable means. The digital signal processor processes digitally the audio signal into a processed audio signal according to the acoustic setting data stored in the erasable acoustic data memory. The electroacoustic transducer converts the processed audio signal then plays it.

Abstract: A transistor structure including a substrate, a gate, a first dielectric layer, a first contact and a second contact is provided. The gate is disposed on the substrate. The first dielectric layer is disposed on the substrate. The first dielectric layer covers a portion of a top surface of the gate. The first contact is electrically connected to the gate. The second contact is disposed on the first dielectric layer. The second contact is electrically connected with the first contact.

Abstract: A diode structure includes a rectangular first doping region, and a second doping region surrounds the first doping region wherein the first doping region and the second doping region are separated by a first isolation structure. A third doping region surrounds the second doping region wherein the second doping region and the third doping region are separated by a second isolation structure. The first isolation structure, the second doping region, the second isolation structure and the third doping region are arranged in a quadruple concentric rectangular ring surrounding the first doping region.

Abstract: A piezoelectric ceramic speaker includes a conductive plate and a round piezoelectric ceramic sheet. The conductive plate has notches and sound delivering holes. The round piezoelectric ceramic plate is stacked on a central region of the conductive plate. The notches are opened on a periphery region of the conductive plate and partly extended toward the central region. The notches are equiangularly arranged on the conductive plate with respect to the center of the conductive plate. Accordingly, auxiliary fixtures can pass through the notches to position the conductive plate. Hence, the conductive plate can be positioned by the fixtures during manufacturing processes. Consequently, the piezoelectric ceramic speaker can be mass produced with good yield rates. Additionally, since the round piezoelectric ceramic plate and the conductive plate are coaxially arranged, a dual-band earphone having the piezoelectric ceramic speaker can provide a better sound resolution performance.

Abstract: The earphone with inverse sound waves includes an earphone housing, a high frequency driver, and a low frequency driver. The earphone housing includes an inner space, a sound output portion, and a reflecting portion. The reflecting portion receives a passive diaphragm. The high frequency driver produces high frequency sound waves and has a sound output direction toward the sound output opening. The low frequency driver is mounted in the inner space of the earphone housing by a mounting brace. The low frequency driver is located between the high frequency driver and the passive diaphragm. A sound transmitting portion is formed between the mounting brace and the earphone housing. The low frequency driver produces low frequency sound waves and has a sound output direction toward the passive diaphragm. The passive diaphragm reflects the low frequency sound waves to the sound output opening via the sound transmitting portion.

Abstract: A noise-reducing headphone includes a headphone housing, a speaker unit, and a microphone. The headphone housing includes an accommodating space and a sound output hole. The accommodating space is communicated with the sound output hole. The speaker unit is positioned in the accommodating space. The speaker unit includes a speaker unit housing and a diaphragm disposed on the speaker unit housing. The diaphragm faces toward the sound output hole and includes a central through hole and an annular vibrating portion around the central through hole. The diaphragm produces sound waves toward the sound output hole by vibrations of the annular vibrating portion. The microphone is disposed on the speaker unit housing and is positioned in the central through hole. The microphone is coaxial to the central through hole. One face of the microphone faces toward the sound output hole and the other faces toward the inner of the headphone housing.

Abstract: A dual-frequency coaxial headphone including a headphone housing, a low-frequency speaker unit, and a high-frequency speaker unit. The headphone housing includes an accommodating space and a sound output hole. The accommodating space is communicated with the sound output hole. The low-frequency speaker unit is positioned in the accommodating space. The low-frequency speaker unit includes a housing and a low-frequency diaphragm disposed on the housing. The low-frequency diaphragm faces toward the sound output hole and includes a central through hole and an annular vibrating portion around the central through hole. The low-frequency diaphragm produces low-frequency sound waves toward the sound output hole by vibrations of the annular vibrating portion. The high-frequency speaker unit is disposed on the housing and is positioned in the central through hole. The high-frequency speaker unit is coaxial to the central through hole.

Abstract: A dual-frequency coaxial earphone includes a dynamic transducer, a cover and a second transducer. The dynamic transducer includes a supporting structure and a vibrating diaphragm mounted to the supporting structure. The cover covers on the supporting structure, so that the cover and the supporting structure define a sound adjusting chamber therein. The cover includes an adjusting orifice communicating with the sound adjusting chamber. The second transducer is adapted to the cover and the second transducer has a first side facing toward the sound adjusting chamber. The sound adjusting chamber is located between the vibrating diaphragm and the second transducer.

Abstract: A piezoelectric ceramic speaker includes a conductive plate and a round piezoelectric ceramic sheet. The conductive plate has notches and sound delivering holes. The round piezoelectric ceramic plate is stacked on a central region of the conductive plate. The notches are opened on a periphery region of the conductive plate and partly extended toward the central region. The notches are equiangularly arranged on the conductive plate with respect to the center of the conductive plate. Accordingly, auxiliary fixtures can pass through the notches to position the conductive plate. Hence, the conductive plate can be positioned by the fixtures during manufacturing processes. Consequently, the piezoelectric ceramic speaker can be mass produced with good yield rates. Additionally, since the round piezoelectric ceramic plate and the conductive plate are coaxially arranged, a dual-band earphone having the piezoelectric ceramic speaker can provide a better sound resolution performance.

Abstract: An earphone with stand-alone high-frequency driver includes a casing, a low-frequency driver, a high-frequency driver, and a protecting cover. The casing defines a sound-guiding passage and a separating wall. The separating wall is formed on a side surface of the sound-guiding passage and defines a sound port, which is in communication with the sound-guiding passage. The high-frequency driver is disposed next to the separating wall and defines a sound-outputting direction. The protecting cover is mated to the casing and covers the high-frequency driver. The sound waves generated by both low- and high-frequency drivers are delivered externally through the sound-guiding passage. The earphone allows structural modifications and assembling the high-frequency driver and the protecting cover after a half-finished product (casing and low-frequency driver) is obtained.

Abstract: A piezoelectric ceramic dual-frequency earphone structure includes an earphone housing, a dynamic transducer, a piezoelectric ceramic transducer and a circuit board. The piezoelectric ceramic transducer is installed in the receiving region. The piezoelectric ceramic transducer is connected to the dynamic transducer via a support unit and a positioning unit. The circuit board is assembled in the receiving region and connected to acoustic signal cables. The acoustic signal cables are connected to a dynamic voice coil of the dynamic transducer and the piezoelectric ceramic transducer. When electric signals are applied to a ceramic membrane of the piezoelectric ceramic transducer, a metal sheet of the piezoelectric ceramic transducer is vibrated to generate high frequency sound, and the high frequency sound are then mixed with the sound from the dynamic transducer.

Abstract: A central noise reduction loudspeaker includes a speaker unit, a top cap, a seat body, and a microphone. The speaker unit includes a diaphragm, and the diaphragm includes a central through hole located at center of the diaphragm. The top cap covers the seat body, and the speaker unit is disposed between the top cap and the seat body. The top cap includes a central fixed frame penetrating the central through hole of the diaphragm. The microphone is disposed within the central fixed frame and located in the central through hole. Since the microphone is disposed in central through hole, compared to conventional, the front cavity and the overall size of the loudspeaker or earphone can be reduced and the production process can be simplified.

Abstract: The earphone with inverse sound waves includes an earphone housing, a high frequency driver, and a low frequency driver. The earphone housing includes an inner space, a sound output portion, and a reflecting portion. The reflecting portion receives a passive diaphragm. The high frequency driver produces high frequency sound waves and has a sound output direction toward the sound output opening. The low frequency driver is mounted in the inner space of the earphone housing by a mounting brace. The low frequency driver is located between the high frequency driver and the passive diaphragm. A sound transmitting portion is formed between the mounting brace and the earphone housing. The low frequency driver produces low frequency sound waves and has a sound output direction toward the passive diaphragm. The passive diaphragm reflects the low frequency sound waves to the sound output opening via the sound transmitting portion.

Abstract: An earphone with stand-alone high-frequency driver includes a casing, a low-frequency driver, a high-frequency driver, and a protecting cover. The casing defines a sound-guiding passage and a separating wall. The separating wall is formed on a side surface of the sound-guiding passage and defines a sound port, which is in communication with the sound-guiding passage. The high-frequency driver is disposed next to the separating wall and defines a sound-outputting direction. The protecting cover is mated to the casing and covers the high-frequency driver. The sound waves generated by both low- and high-frequency drivers are delivered externally through the sound-guiding passage. The earphone allows structural modifications and assembling the high-frequency driver and the protecting cover after a half-finished product (casing and low-frequency driver) is obtained.

Abstract: A piezoelectric-type speaker is provided for converting electrical signals into sounds capable of being heard by a human ear. The piezoelectric-type speaker includes a housing, a separating portion, a supporting base, a high-pitched speaker and a dynamic low-pitched speaker. The separating portion is disposed at the housing and provided for separating interior spaces of the housing. The supporting base is disposed at the housing. One end of the supporting base is fastened with the separating portion. The high-pitched speaker is formed by a piezoelectric member, and is supported by the other end of the supporting base. The dynamic low-pitched speaker is disposed in the housing. The dynamic low-pitched speaker is disposed at the separating portion and opposite the high-pitched speaker.

Abstract: An earphone device having sound guiding structures includes a housing, a sound guiding cover, a first speaker unit, and a second speaker unit. The housing includes a shell and an acoustic opening. The sound guiding cover is in the shell and includes a front and a rear guide portions. The front guide portion is close to the acoustic opening. The front guide portion includes a first accommodating portion and a guide tube communicating with the first accommodating portion and extending toward the acoustic opening. A guide passage is defined between the front guide portion and the shell. The rear guide portion is away from the acoustic opening relative to the front guide portion. The rear guide portion includes a second accommodating portion communicating with the guide passage. The first speaker unit is in the first accommodating portion. The second speaker unit is in the second accommodating portion.

Abstract: A range switching earphone includes an earphone housing, a low frequency speaker, a high frequency speaker, a circuit adaptation module, and a control unit. The low frequency speaker, the high frequency speaker, and the circuit adaptation module are in the earphone housing. The circuit adaptation module is electrically connected to the low frequency speaker and the high frequency speaker. The control unit is connected to the circuit adaptation module for switching on or off of the high frequency speaker or for switching filtering modes of a filtering unit in the circuit adaptation module. Therefore, different frequency response can be achieved with the same earphone, thereby satisfying requirements or tastes of users for listening music of different styles or in different circumstances. Thus, both classical music lovers and game players who want to have an immersed sense can all be satisfied by the range switching earphone.

Abstract: A piezoelectric ceramic dual-band bass-enhanced earpiece includes an earphone shell, a moving coil speaker assembly and a piezoelectric ceramic speaker component. The earphone shell includes an acoustic output orifice. The moving coil speaker assembly includes a moving coil speaker and a circuit connecting unit electrically connected to the moving coil speaker. The piezoelectric ceramic speaker component is located between the acoustic output orifice and moving coil speaker assembly and includes a piezoelectric ceramic plate and a conductive member connecting to the piezoelectric ceramic plate and the circuit connecting unit. The piezoelectric ceramic plate includes a plurality of acoustic through orifices. With the combination of the piezoelectric ceramic speaker component and moving coil speaker assembly, the piezoelectric ceramic dual-band bass-enhanced earpiece achieves the hearing effect that high-frequency sound wave surrounded by low-frequency sound wave.

Abstract: A method for fabricating semiconductor device is disclosed. The method includes the steps of: providing a substrate; forming a doped region in the substrate; forming a thermal oxide layer on the substrate and the doped region; removing the thermal oxide layer to form a first recess; forming an epitaxial layer on the substrate and in the first recess; and forming a gate dielectric layer in the epitaxial layer.