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

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 ...

AI Technical Summary

Problems solved by technology

The presence of a large number of JITTERs will also cause popping sounds

Images