Abstract: The present application discloses a crosstalk elimination method and a playback system for crosstalk elimination. The method includes steps: inputting a first test signal into a signal processor via an audio source input cable; detecting a first crosstalk signal generated by a second speaker and caused by a first test signal when the signal processor transmitting the first test signal to the first speaker; reversing the detected first crosstalk signal to a first reversed signal having equal volume and opposite phase, wherein when the signal processor transmits the first test signal to the first speaker again, the second speaker receives the first crosstalk signal and emits a first crosstalk sound, the first reversed signal is transmitted to the second speaker to emit a first reversed phase sound, and the first reversed phase sound eliminates the first crosstalk sound.

Abstract: Methods for determining suitability of Czochralski growth conditions to produce silicon substrates for epitaxy. The methods involve evaluating substrates sliced from ingots grown under different growth conditions (e.g., impurity profiles) by imaging the wafer by infrared depolarization. An infrared depolarization parameter is generated for each epitaxial wafer. The parameters may be compared to determine which growth conditions are well-suited to produce substrates for epitaxial and/or post-epi heat treatments.

Abstract: The disclosure is a power tool. The adaptor head includes a seat, a connecting sleeve, an inserting hole and a rolling ball trench. The inserting hole is disposed in the connecting sleeve. The rolling ball trench communicates with the inserting hole. The rolling balls are movably accommodated in the rolling ball trench and include a lower rolling ball which may partially fall in the inserting hole and upper rolling balls. The upper rolling balls include a front rolling ball and a rear rolling ball. The sleeve includes a blocking block and a buffering trench and moves relative to the seat to make the front rolling ball blocked by the blocking block or fall in the buffering trench. The flexible ring flexibly presses the rear rolling ball.

Abstract: A pneumatic tool includes a casing unit, an air motor, a rotary valve, and a turning unit. The rotary valve is rotatably mounted to the air motor. The turning unit is movably mounted to the casing unit, and is connected to the rotary valve such that movement of the turning unit relative to the casing unit drives rotation of the rotary valve relative to the air motor to one of a first-end position, a second-end position and at least one in-between position, in which an opening of the rotary valve is in spatial communication with a respective one of a first passage, a second passage and at least one sub-passage for adjusting airflow that travels from an air inlet passage of the casing unit, through the rotary valve, and into the air motor.

Abstract: A pneumatic tool includes a casing unit, an air motor, a rotary valve, and a turning unit. The rotary valve is mounted to the air motor and is rotatable about a valve axis. The turning unit includes a ring member that surrounds and is rotatably mounted to the casing unit, and that is connected to the rotary valve, such that rotation of the ring member relative to the casing unit drives the rotary valve to rotate about the valve axis relative to the air motor among a first-end position, a second-end position and at least one in-between position for adjusting airflow that travels from an air inlet passage of the casing unit, through an opening and an intermediate passage of the rotary valve, to an air chamber of the air motor.

Abstract: A pneumatic tool includes a casing unit, an air motor, a rotary valve, and a turning unit. The rotary valve is rotatably mounted to the air motor. The turning unit is movably mounted to the casing unit, and is connected to the rotary valve such that movement of the turning unit relative to the casing unit drives rotation of the rotary valve relative to the air motor to one of a first-end position, a second-end position and at least one in-between position, in which an opening of the rotary valve is in spatial communication with a respective one of a first passage, a second passage and at least one sub-passage for adjusting airflow that travels from an air inlet passage of the casing unit, through the rotary valve, and into the air motor.

Abstract: A pneumatic tool includes a casing unit, an air motor, a rotary valve, and a turning unit. The rotary valve is mounted to the air motor and is rotatable about a valve axis. The turning unit includes a ring member that surrounds and is rotatably mounted to the casing unit, and that is connected to the rotary valve, such that rotation of the ring member relative to the casing unit drives the rotary valve to rotate about the valve axis relative to the air motor among a first-end position, a second-end position and at least one in-between position for adjusting airflow that travels from an air inlet passage of the casing unit, through an opening and an intermediate passage of the rotary valve, to an air chamber of the air motor.

Abstract: A pneumatic tool includes a front housing, an air cylinder, a rotor and a rear housing. The front housing includes a first depressing portion recessedly formed at an end thereof. The air cylinder includes a cylinder body and a front end cover. The cylinder body includes a first end, a second end and at least one exhaust channel. The first end is engaged with the first depressing portion. The exhaust channel is formed at the cylinder body. The front end cover is engaged with the first end. The rear housing includes a second depressing portion recessedly formed at an end thereof. The second end of the cylinder body is engaged with the second depressing portion. The front housing is assembled with the rear housing, and the front housing and the rear housing abut against the air cylinder in an airtight manner.