Vehicle-mounted DVD navigation audio-visual device for realizing audio frequency increasing

An audio, video and audio technology, applied in the field of car DVD navigation audio and video devices, to achieve the effect of improving the large dynamic effect of sound, improving the large distortion and stabilizing the clock circuit

Inactive Publication Date: 2010-08-11
FUJIAN ELECTRONICS INFORMATION TECH CO LTD SONG AIRLINES
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  • Vehicle-mounted DVD navigation audio-visual device for realizing audio frequency increasing
  • Vehicle-mounted DVD navigation audio-visual device for realizing audio frequency increasing

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Embodiment Construction

[0007] The present invention will be further described below in conjunction with the accompanying drawings and examples of implementation.

[0008] Such as figure 1 As shown, the present invention provides a kind of car DVD navigation audio-visual device that realizes audio frequency up-conversion, it is characterized in that: ARM, DSP and digital power amplifier module are arranged in described car DVD navigation audio-visual device, the control terminal of described ARM and DSP Connect; the DSP includes an audio frequency up-conversion module and a clock circuit that provides a stable clock for the audio frequency up-conversion module; the PCM output of the DSP is connected with the PCM input of the digital power amplifier module; the PWM output of the digital power amplifier module is connected There are horns. In a preferred implementation example of the present invention, the digital power amplifier module includes an audio processor, a sampling frequency converter and a...

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Abstract

The invention relates to a vehicle-mounted DVD navigation audio-visual device for realizing audio frequency increasing, which is characterized in that: an ARM, a DSP and a digital power amplification module are arranged in the vehicle-mounted DVD navigation audio-visual device; the control end of the ARM is connected with the DSP; the DSP comprises an audio frequency increasing module and a clock circuit providing stable clock for the audio frequency increasing module; the PCM output end of the DSP is connected with the PCM input end of the digital power amplification module; and the PWM output end of the digital power amplification module is connected with a loudspeaker. The low sampling rate of an audio signal is increased to 24bit quantization accuracy 192KHz sampling rate, the dynamic effect of the sound is improved, and the distortion condition when the traditional equipment plays a weak signal is improved; meanwhile, the frequency increasing can also greatly reduce the distorsion and noise generated during digital-analog conversion.

Description

technical field [0001] The invention relates to a vehicle-mounted DVD navigation audio-visual device for realizing audio frequency up-conversion. Background technique [0002] At present, the car DVD navigation audio-visual system on the market has a lot of clock jitter due to circuit interference, lines, carriers (CD, DVD) and many other reasons. The human ear is very sensitive to jitter. When you hear the sound decoded from a signal with severe jitter, you try to identify the position of the instrument. Even if you concentrate on it, it is difficult to hear clearly. Your ears try to identify the specific frequency of the sound, but due to the existence of jitter, the sound becomes floating, so you can't hear it very clearly. When your brain receives the sound signal, it tries to interpret the sound as a specific frequency. Image, such as plump, warm, gorgeous, etc. When there are too many jitters, this work will become difficult, and over time, you will feel tired. When ...

Claims

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Application Information

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IPC IPC(8): G11B20/10G11B20/22
Inventor 高尔登王文梁陈慧
Owner FUJIAN ELECTRONICS INFORMATION TECH CO LTD SONG AIRLINES
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