Method for modulating multi-standard-bit pulse width
A pulse width modulation, multi-level technology, applied in the direction of pulse duration/width modulation, pulse processing, pulse technology, etc., can solve problems such as inconvenience and inappropriateness
Inactive Publication Date: 2011-07-20
ELAN MICROELECTRONICS CORPORATION
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Problems solved by technology
[0007] It can be seen that the above-mentioned existing pulse width modulation method obviously still has inconvenience and defects in method and use, and needs to be further improved urgently.
In order to solve the above problems, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and the general method has no suitable method to solve the above problems. This is obviously related The problem that the industry is eager to solve
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[0046] In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation methods, methods and steps of the multi-level pulse width modulation method proposed according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. , features and their effects are described in detail below.
[0047] see image 3 Shown is a waveform diagram of a pulse width modulation signal generated according to an embodiment of the present invention. In order to reduce the instantaneous energy change, for each modulated pulse wave (hereinafter referred to as the modulated pulse) contained in the pulse width modulation (pulse width modulation, PWM) signal, the rising edge and falling edge should be slowly rising. Or the state of slow descent is better. But relatively speaking, users generally pay more attention to the noise effect caused ...
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The present invention relates to a multi-level width modulating method for sampling an input signal so as to generate a corresponding pulse width modulating signal; wherein, the pulse width modulating signal comprises at least a modulating pulse. The multi-level pulse width modulating method is characterized in that: energy is improved gradually in a multi-step manner in the modulating pulse so as to lead the rising edge of the modulating pulse to lean slightly, thus reducing the instant energy change. The multi-level pulse width modulating method provided by the present invention leads the waveform of the pulse width modulating signal to change meekly, so the instant energy change is meeker than that in the prior art, and the degree of the instant energy change can be effectively reduced. If the improved pulse width modulating signal is used for driving a loudspeaker, the occurrence of noise can be greatly reduced; therefore the signal is very practical.
Description
technical field [0001] The present invention relates to a pulse width modulation method, in particular to a multi-level pulse width modulation method (Multi-Level Pulse Width Modulation Method) which can effectively reduce the degree of instantaneous energy variation by a pulse wave with inclined edges. Background technique [0002] Pulse Width Modulation (PWM, hereinafter referred to as PWM) uses different duty cycles to represent various signals (signals are signals, and are referred to as signals herein). see figure 1 Shown is a waveform diagram of a PWM (Pulse Width Modulation) signal used in the prior art. In this technique, the waveform of the PWM signal is composed of square waves with different widths. A wider square wave represents higher energy, while a narrower square wave represents less energy. By using such a PWM signal to drive the speaker, an analog sound output can be generated from the speaker. This driving method has been adopted by many sound output de...
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IPC IPC(8): H03K7/08H03K5/1252
Inventor 麦威国张正儒
Owner ELAN MICROELECTRONICS CORPORATION