公开(公告)号：US20240088855A1

公开(公告)日：2024-03-14

申请号：US18460187

申请日：2023-09-01

Applicant: SEIKO EPSON CORPORATION

Inventor： Takao Katayama ,  Fumihito Baisho ,  Tsutomu Nonaka

IPC: H03G3/00 ,  H03G3/30

CPC classification number: H03G3/002 ,  H03G3/3005 ,  H03G2201/10 ,  H03G2201/30 ,  H03G2201/70

Abstract: An audio mixing device includes a gain setting circuit configured to set first to n-th gains based on a command input from the outside, n being an integer of two or more, and a mixing circuit configured to output a mixing signal obtained by mixing two or more of first to n-th multiplication data obtained by respectively multiplying first to n-th audio data by the first to n-th gains. In a case where the j-th gain of the first to n-th gains is set to a first value, when the j-th gain is to be set to a second value different from the first value, the gain setting circuit transitions the j-th gain from the first value to the second value in a stepwise manner in a j-th gain change section of first to n-th gain change sections.

公开(公告)号：US20240283417A1

公开(公告)日：2024-08-22

申请号：US18318321

申请日：2023-05-16

Applicant: TRON FUTURE TECH INC.

Inventor： YU-JIU WANG ,  YUE MING WU ,  HAO-CHUNG CHOU ,  TA-SHUN CHU

IPC: H03F3/24 ,  H03G3/30

CPC classification number: H03F3/245 ,  H03G3/3042 ,  H03F2200/105 ,  H03F2200/451 ,  H03G2201/10 ,  H03G2201/307

Abstract: The present application discloses a radio frequency (RF) device. The radio frequency device includes a power amplifier, a power detector, and a digital signal processor (DSP). The power amplifier outputs a RF signal. The power detector receives the RF signal, and performs a plurality of calibration operations to generate a plurality of calibration voltages corresponding to a plurality of bias voltage, wherein the calibration operations are performed at the bias voltages respectively, and the calibration voltages are temperature-correlated due to that electrical characteristics of the power detector are temperature-correlated. The DSP controls the power detector to operate at the bias voltages, obtains an index voltage for indicating power of the RF signal by performing calculations upon the calibration voltages to reduce temperature dependency of the index voltage, and adjusts a gain of the power amplifier according to the index voltage.