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48results about How to "Suppression width" patented technology

Soft transitions between muted and unmuted states in class D audio amplifiers

A class AD audio amplifier system (10) with reduced noise capability in muting and unmuting events is disclosed. The amplifier system (10) includes multiple audio channels (20), each of which can be constructed to include a pulse-width-modulator (PWM) (24). The PWM modulator (24) includes a pair of comparators (39A, 39B; 52+, 52−) that generate complementary PWM output signals based upon the comparison between a filtered difference signal and a reference waveform. When the system is muted, a common mode voltage (CM_RAMP) is applied to the inputs of the comparators (39A, 39B; 52+ 52−) to suppress the duty cycle at the amplifier output, preferably to a zero duty cycle. In the transition from a muted state to an unmuted state, the common mode voltage (CM_RAMP) is ramped from the suppressing voltage to zero common mode voltage, permitting the duty cycle of the complementary PWM signals to gradually increase, thus reducing clicks and pops. The converse operation is performed in the transition from unmuted to muted. Pulse-width-modulation control logic (26) is also included to ensure that that the PWM “on” and “off” pulses are of at least a minimum duration, and also to generate compensating pulses on the complementary PWM line at low duty cycles.
Owner:TEXAS INSTR INC

Soft transitions between muted and unmuted states in class D audio amplifiers

A class AD audio amplifier system (10) with reduced noise capability in muting and unmuting events is disclosed. The amplifier system (10) includes multiple audio channels (20), each of which can be constructed to include a pulse-width-modulator (PWM) (24). The PWM modulator (24) includes a pair of comparators (39A, 39B; 52+, 52−) that generate complementary PWM output signals based upon the comparison between a filtered difference signal and a reference waveform. When the system is muted, a common mode voltage (CM_RAMP) is applied to the inputs of the comparators (39A, 39B; 52+ 52−) to suppress the duty cycle at the amplifier output, preferably to a zero duty cycle. In the transition from a muted state to an unmuted state, the common mode voltage (CM_RAMP) is ramped from the suppressing voltage to zero common mode voltage, permitting the duty cycle of the complementary PWM signals to gradually increase, thus reducing clicks and pops. The converse operation is performed in the transition from unmuted to muted. Pulse-width-modulation control logic (26) is also included to ensure that that the PWM “on” and “off” pulses are of at least a minimum duration, and also to generate compensating pulses on the complementary PWM line at low duty cycles.
Owner:TEXAS INSTR INC

Riding-type vehicle

A riding-type vehicle comprises a head pipe, a lower frame, an engine provided with an air cylinder cover, an air cylinder and a crankshaft box, an air exhaust pipe provided with a first part extending from the air cylinder cover towards the front direction, a lower engine cover, a support bar provided with a front end portion, a right back end portion extending towards the right back direction and a left back end portion extending towards the left back direction, a mounting portion used for fixing the lower engine cover on the lower frame closer to the lower portion compared with the first part, a support bar mounting portion used for fixing the support bar on the mounting portion, and an engine cover mounting portion used for fixing the lower engine cover, wherein the riding-type vehicle is provided with a temporarily fixing part; the temporarily fixing part and the lower engine cover are overlapped; one of the right back end portion and the left back end portion of the support bar is configured between the air exhaust pipe through which the front end portion penetrates and the engine; the engine cover is fixed at the outside of the air exhaust pipe; and the engine cover mounting portion and the support bar mounting portion are fixed on the mounting portion through the temporary fixation of the temporarily fixing portion.
Owner:YAMAHA MOTOR CO LTD
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