CN204231640U - A kind of multistage amplitude limit control system exported for audio frequency - Google Patents

Abstract

The utility model relates to electronic technology field, and disclose the multistage amplitude limit control system that a kind of audio frequency exports, this multistage amplitude limit control system comprises Audio Input Modules, frequency division module, clipping module, frequency mixing module, power amplifier module and dio Output Modules; Audio signal is inputed to frequency division module by described Audio Input Modules; Frequency division module is divided into different frequency range by the audio signal received and according to the frequency range at its place, adopts a clipping module to carry out amplitude limiting processing to described frequency range respectively for each frequency range; Frequency mixing module carries out Frequency mixing processing to the audio frequency obtaining each frequency range after amplitude limiting processing, after being amplified, and exports to dio Output Modules output by power amplifier module to the audio signal that mixing obtains.The utility model adopts a clipping module to carry out amplitude limiting processing according to each frequency range respectively, makes each frequency range can play the effect of himself like this, thus can improve the acoustic pressure effect of whole audio frequency, more can meet the demand of user.

Description

A kind of multistage amplitude limit control system exported for audio frequency

Technical field

The utility model relates to electronic technology field, in particular, and particularly a kind of multistage amplitude limit control system exported for audio frequency.

Background technology

In general, the frequency range that people's ear can be heard is the audio signal of 20Hz ~ 20KHz.In audio area, the Energy distribution of each frequency range is inconsistent, and main energy is in bass part loss.But main acoustic pressure effect is produced by alt part, so the sense of hearing effect that each frequency range produces also is inconsistent.

Current audio product is due to rated power restricted problem, and can carry out amplitude limiting processing by the signal excessive to signal output amplitude, the later output of amplitude limit can present cuts top distortion.The means of amplitude limit all only employ the unified output amplitude of restriction, and that is set an output amplitude restriction (consulting shown in Fig. 1), when there being other arbitrary signal output amplitude to exceed set point, signal all can be limited output amplitude.The high frequency signal of generation main acoustic pressure effect will be made like this can not to have better performance, therefore will affect its acoustic pressure effect.

Summary of the invention

The purpose of this utility model is the technical problem existed for prior art, provides a kind of multistage amplitude limit control system exported for audio frequency, carries out amplitude limiting processing respectively for each frequency range, thus improve acoustic pressure effect.

In order to solve problem set forth above, the technical solution adopted in the utility model is:

The multistage amplitude limit control system that audio frequency exports, this multistage amplitude limit control system comprises Audio Input Modules, frequency division module, clipping module, frequency mixing module, power amplifier module and dio Output Modules;

Audio signal is inputed to frequency division module by described Audio Input Modules; Frequency division module is divided into different frequency range by the audio signal received and according to the frequency range at its place, adopts a clipping module to carry out amplitude limiting processing to described frequency range respectively for each frequency range; Frequency mixing module carries out Frequency mixing processing to the audio frequency obtaining each frequency range after amplitude limiting processing, after being amplified, and exports to dio Output Modules output by power amplifier module to the audio signal that mixing obtains.

Compared with prior art, the beneficial effects of the utility model are:

The utility model adopts frequency division module to be divided into different frequency range to audio signal, a clipping module is adopted to carry out amplitude limiting processing respectively according to each frequency range, like this when bass frequency range carries out amplitude limiting processing, the power output of alt and high pitch frequency range can not be affected, make each frequency range can play the effect of himself, thus the acoustic pressure effect of whole audio frequency can be improved, more can meet the demand of user.

Accompanying drawing explanation

Fig. 1 is the effect schematic diagram of existing traditional clipping mode.

Fig. 2 is the schematic diagram of the utility model multistage amplitude limit control system.

Fig. 3 is the effect schematic diagram of the utility model multistage amplitude limit control system.

Embodiment

For the ease of understanding the utility model, below with reference to relevant drawings, the utility model is described more fully.Preferred embodiment of the present utility model is given in accompanying drawing.But the utility model can realize in many different forms, is not limited to embodiment described herein.On the contrary, provide the object of these embodiments be make the understanding of disclosure of the present utility model more comprehensively thorough.

Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present utility model understand usually.The object of the term used in specification of the present utility model herein just in order to describe specific embodiment, is not intended to be restriction the utility model.

Consult shown in Fig. 2, a kind of multistage amplitude limit control system exported for audio frequency that the utility model provides, this multistage amplitude limit control system comprises Audio Input Modules, frequency division module, clipping module, frequency mixing module, power amplifier module and dio Output Modules.

Audio signal is inputed to frequency division module by described Audio Input Modules.

Frequency division module is divided into different frequency range by the audio signal received and according to the frequency range at its place, comprise the first frequency range, the second frequency range, the 3rd frequency range ... n-th frequency range, a clipping module is set respectively for each frequency range amplitude limiting processing is carried out to this frequency range, be i.e. corresponding first frequency range of the first clipping module, corresponding second frequency range of the second clipping module ... corresponding n-th frequency range of n-th clipping module.

Frequency mixing module carries out Frequency mixing processing to the audio frequency obtaining each frequency range after amplitude limiting processing, after being amplified, and exports to dio Output Modules output by power amplifier module to the audio signal that mixing obtains.

In general, bass frequency range occupies the power of audio system 56%, alt frequency range occupies the power of audio system 30.5%, high pitch frequency range only occupies the power of audio system 13.5%, and produce sound dynamics in bass frequency range, the brightness (loudness) of sound and the part of details are then in alt frequency range.When carrying out output amplitude restriction to power output, (namely limiting power output) is confined is at first bass frequency range.Because bass frequency range triggers amplitude limit, so alt frequency range does not just also play the support just losing audio system energy usually, acoustic pressure effect will be affected like this.

The utility model uses output violent change effectively can solve equilibrium problem between energy consumption and sense of hearing for each frequency range, can make compared with realizing larger acoustic pressure effect under low energy consumption, to set forth below by example:

If in traditional limiter system, the audio frequency apparatus of a 5W power, its amplitude limit exports and will fix on 5W up and down, and overage will be formed cuts top distortion.That is the power output of central bass frequency range will amplitude limit in 2.8W (5 × 56%) left and right, alt frequency range exports and also can be cut top simultaneously, at this moment the power output of alt frequency range is defined as 1.6W (5 × 30.5%), and the power output of high pitch frequency range is 0.67W (5 × 13.5%).And in the utility model, redistributed the power stage of system when amplitude limit, bass frequency band power just produces restriction at 2W and exports, and alt frequency band power can be set as 2.1W, and high pitch frequency range can be set as 0.9W.

For the audio frequency apparatus of a 7W power, in traditional clipping mode, corresponding numerical value is the power output of middle bass frequency range is 3.9W (7 × 56%), the power output of alt frequency range is 2.1W (7 × 30.5%), the power output 0.9W (7 × 13.5%) of high pitch frequency range

Can find out in above-mentioned, for the audio frequency apparatus of 5W power, adopt amplitude limit control system of the present utility model, in the power output of alt frequency range and high pitch frequency range, be equal to the size of traditional limiter system for its power output of audio frequency apparatus of 7W power, and alt frequency range and high pitch frequency range are exactly the size of sound to the impression of auditor, the namely index of acoustic pressure and loudness, namely when bass frequency range carries out amplitude limit, alt frequency range can not also affect by amplitude limit, consult Fig. 3 can find out, each frequency range is respectively by after amplitude limiting processing, be independent of each other each other, each frequency range can distinguish power output, make the performance of overall acoustic pressure will to be better than the single amplitude limit product of same power like this, therefore acoustic pressure effect can be improved.

Above-described embodiment is the utility model preferably execution mode; but execution mode of the present utility model is not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection range of the present utility model.

Claims (1)

1. a multistage amplitude limit control system for audio frequency output, is characterized in that: this multistage amplitude limit control system comprises Audio Input Modules, frequency division module, clipping module, frequency mixing module, power amplifier module and dio Output Modules;

Audio signal is inputed to frequency division module by described Audio Input Modules; Frequency division module is divided into different frequency range by the audio signal received and according to the frequency range at its place, adopts a clipping module to carry out amplitude limiting processing to described frequency range respectively for each frequency range; Frequency mixing module carries out Frequency mixing processing to the audio frequency obtaining each frequency range after amplitude limiting processing, after being amplified, and exports to dio Output Modules output by power amplifier module to the audio signal that mixing obtains.