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Audio processing method and audio processing apparatus

A technology for audio processing and input audio, which is applied in signal processing, frequency response correction, manual tone/bandwidth control, etc., and can solve problems such as timing diagrams or waveform diagrams not shown

Inactive Publication Date: 2008-04-30
SONY GRP CORP
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  • Abstract
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Problems solved by technology

[0007] The above publication only shows the circuit structure and frequency characteristics, but does not show timing diagrams or waveform diagrams

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  • Audio processing method and audio processing apparatus
  • Audio processing method and audio processing apparatus

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Embodiment Construction

[0036] A basic method and audio processing apparatus for low-frequency enhancement based on overtone generation will be described with reference to FIGS. 1 to 4 .

[0037] First, a basic method of low-frequency enhancement based on overtone generation will be described with reference to FIG. 1 .

[0038] Fig. 1 shows the frequency characteristics of a small-diameter speaker.

[0039] Loudspeakers have a very high minimum reproducible frequency f0, say 100Hz. Within the frequency range not greater than the lowest reproducible frequency f0, the lower the frequency, the lower the output sound pressure level of the fundamental component.

[0040]A frequency band Be from the lowest reproducible frequency f0 to a frequency fe (=2f0) is a region corresponding to the lowest frequency sound audible to the human ear. Typically, an overtone signal having a frequency no greater than about 200 Hz is generated without discomfort to the listener.

[0041] Therefore, in the embodiment of t...

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Abstract

A sample of a component having a frequency less than a predetermined frequency in an input audio signal, which is a digital signal having a predetermined sampling frequency, is written in a memory. An overtone signal having a frequency N times the frequency of the input audio signal is generated by repeating N times of operations, wherein N is an integer greater than one, the operations comprising the steps from the first one-way zero-crossing point to the first one-way crossing In each cycle period of the second unidirectional zero crossing after the zero point, for every N samples from the memory, one sample is read out, and (N-1) samples are diluted, and each unidirectional zero crossing is the input audio signal The point in time when the level of the audio signal changes from negative to positive or the level of the input audio signal changes from positive to negative.

Description

technical field [0001] The present invention relates to a method and an apparatus for generating harmonic overtones by multiplying the frequency of an audio signal. The invention also relates to methods and devices for enhancing low frequency components of an audio signal using the generated overtones. Background technique [0002] In audio systems such as small-component stereo systems and flat-panel television receivers, small-diameter speakers are used, and an enclosure accommodating the speakers (ie, a speaker box) is also small in size. This loudspeaker has a very high lowest reproducible frequency (lowest reproducible frequency) f0, about 100 Hz or more. [0003] Generally, when a low-frequency component not higher than the lowest reproducible frequency f0 is supplied to the speaker, as the frequency decreases, the output sound pressure level of the fundamental-wave component decreases and the distortion component (harmonic ( The number of harmonic-wave) components) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G5/02H04R3/00H04R3/04G10L21/007G10L21/045
CPCH04R3/04H04R2430/03
Inventor 志村大大栗一敦仲上太郎
Owner SONY GRP CORP
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