Voltage fluctuation compensator for audio frequency output amplifier
A technology of audio output and voltage change, applied to amplifiers, improved amplifiers to reduce noise impact, amplifiers with semiconductor devices/discharge tubes, etc., can solve problems such as instability (low shrinkage, etc.), to eliminate noise and improve audio The effect of sound quality
Inactive Publication Date: 2008-07-02
LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
View PDF0 Cites 5 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0008] However, the audio output amplifier of the above-mentioned Class-D type is shown in Figure 2b. Since there is no feedback loop (Feed-Back Loop), if the input voltage is unstable (reduced), it will change to a sawtooth signal It is a standard pulse width, and it will appear in the output as it is, so the fluctuation value of the above output signal becomes the main cause of audio noise
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0025] Hereinafter, specific embodiments of the voltage fluctuation compensating device for an audio output amplifier of the present invention as described above will be described in detail with reference to the accompanying drawings.
[0026] That is, FIG. 3 is a configuration diagram of a voltage fluctuation compensating device for an audio output amplifier according to the present invention.
[0027] As shown in Fig. 3, for the voltage variation compensation device of the audio output amplifier of the present invention, the digital converter 20 of the class (Class)-D type audio output amplifier includes the following components: The sawtooth wave generator 50 of the sawtooth wave signal of the standard (Reference); according to the input voltage of the preamplifier 10, adjust the pulse amplitude regulator 60 of the amplitude of the sawtooth wave signal of the standard signal; the non-inverting terminal (+) passes the pulse amplitude The adjuster 60 receives the sawtooth wav...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a compensation device of voltage variation for an audio output amplifier, which is a device counteracting the voltage variation according to changes of audio output aiming at the changes of input voltage of the audio output amplifier. The invention comprises the following components: a preamplifier having an amplified input audio signal, and a digital conversion part which converts input voltage of the preamplifier into PWM signals. As for an audio output amplifier including a power amplifier which amplifies the power of PWM signals and outputs the signals, the digital conversion part comprises a signal regulation device which counteracts change conditions of the input voltage presented during output after a standard sawtooth wave signal is reduced or increased through changes of the input voltage for converting the PWM signals. The invention can regulate the PWM signals according to voltage changes, so as to counteract the changes of the input voltage presented during output, eliminate noise and improve tone quality of the audio frequency.
Description
technical field [0001] The invention relates to a voltage variation compensating device for an audio output amplifier, in particular to a voltage variation compensating device for an audio output amplifier that counteracts input voltage variations in the audio output amplifier to improve audio quality. Background technique [0002] As is well known, portable devices such as PDA (Personal Digital Assistant) or PMP (Portable Multimedia Player) require the output of audio signals for reproduction of music files or video files or for playing games. In order to make the output of the audio signals high The output is broadband, so an audio output amplifier is applied. [0003] The above-mentioned audio output amplifiers are divided into Class (Class)-AB type and Class (Class)-D type according to their types, and when using Class (Class)-AB type audio output amplifiers, the feedback (Feed-Back) receiving amplifier output The audio signal, and then perform signal compensation for o...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H03F1/26H03F3/217
Inventor 全范镇
Owner LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI