CN203872139U

CN203872139U - High-signal-to-noise-ratio actual sound recording sound console device convenient to carry and capable of reducing noise

Info

Publication number: CN203872139U
Application number: CN201420306174.6U
Authority: CN
Inventors: 云烈阳
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-06-10
Filing date: 2014-06-10
Publication date: 2014-10-08
Anticipated expiration: 2024-06-10

Abstract

The utility model discloses a high-signal-to-noise-ratio actual sound recording sound console device convenient to carry and capable of reducing noise. The actual sound recording sound console comprises a lithium battery pack, a switch, a low-frequency inductor, a direct-current transformation group, an EMI filter circuit, an operational amplification circuit, an A/D converter and a digital signal processing chip. After the voltage of a single group of a 7.2v direct current is transformed into +15v, -15v, +9v, +5v and +3v, the voltage is supplied to integrated circuits such as the operational amplification circuit and a digital signal processing circuit, meanwhile, an analog amplification integrated circuit affecting the tone quality in the device is replaced by the operational amplification circuit with the high conversion rate and low background noise, and there the purpose that the signal-to-noise ratio is improved can be achieved.

Description

The high s/n ratio instant report recording console equipment of the portable noise reduction of energy

Technical field

The utility model relates to electricity field, particularly, relates to the high s/n ratio instant report recording console equipment of the portable noise reduction of a kind of energy.

Background technology

At present, film instant report recording field is mainly some external reputable brands, traditional famous foreign brand name has nagra, audio, sound-devices, tascam, fostex, marantz etc., the product of these famous foreign brand names relies on the various and reliability of its product specification, in the on-the-spot extensive use of various domestic and international cinefilm sound recordings.Substantially each brand has 2,3, sound console and the recorder of 4,6,8 tracks such as grade, and log file form is relatively many, mp3, bwf, wav, has 8,16,24 etc. etc., number of bits, and sampling precision has 32kz, 44.1kz, 48kz, 96kz etc.

The recorder of these reputable brands and sound console, with firm most recording market of reliably having captured, they can add low cutting conventionally in voice-grade channel, press the functions such as limit,, when the room of the noise that cannot get rid of in the face of some scenes generator car limit road as other in factory's limit computer or spaciousness echoes, these sound consoles and recorder but can only be felt simply helpless.

Utility model content

The purpose of this utility model is, for the problems referred to above, proposes the high s/n ratio instant report recording console equipment of the portable noise reduction of a kind of energy, to realize the advantage that suppresses noise raising to-noise ratio.

For achieving the above object, the technical solution adopted in the utility model is:

A high s/n ratio instant report recording console equipment for the portable noise reduction of energy, comprises lithium battery group, switch, low frequency inductance, direct current transformation group, EMI filter circuit, operational amplification circuit, A/D converter and digital signal processing chip, the a end of described low frequency inductance is connected with lithium battery group by switch, the b end of described low frequency inductance is connected with direct current transformation group input, and described direct current transformation group comprises 5 commutator transformers, these 5 be respectively+3v of commutator transformer commutator transformers, + 5v commutator transformer, + 9v commutator transformer, + 15v commutator transformer and-15v commutator transformer, and described+3v commutator transformer, + 5v commutator transformer, + 9v commutator transformer, + 15v commutator transformer and-15v commutator transformer output be connected with the input of EMI filter circuit, output setting+3v splicing ear of EMI filter circuit, + 5v splicing ear, + 9v splicing ear, + 15v splicing ear, 6 splicing ears of-15v splicing ear and grounding connection terminal, described+3v splicing ear, + 5v splicing ear is connected with the digital circuit of A/D converter and digital signal processing chip composition with grounding connection terminal, described+9v splicing ear, + 15v splicing ear,-15v splicing ear is connected with operational amplification circuit with grounding connection terminal.

Further, described EMI filter circuit comprises high-frequency inductor, capacitor C 11, capacitor C 12, capacitor C 13 and capacitor C 14, and described capacitor C 11 is connected with high-frequency inductor, and described capacitor C 12, capacitor C 13 and capacitor C 14 are respectively at capacitor C 11 parallel connections.

Further, described direct current transformation group and EMI filter circuit are arranged in iron-clad.

Further, described A/D converter adopts AK5393 chip, and described digital signal processing chip adopts ADSP-21065L chip.

Further, described operational amplification circuit adopts OPA2604AP amplifier chip.

The technical solution of the utility model has following beneficial effect:

The technical solution of the utility model, after single group 7.2v direct current transformation is+15-15+9+5+3 volts, supply with the integrated circuits such as operational amplifier digital processing, adopt switching rate high the simulation amplification circuit that affects tonequality in equipment simultaneously, the operational amplification circuit that background noise is low, reaches the object that improves to-noise ratio noise.

Direct current transformation group and EMI filter circuit are arranged in iron-clad, have further reduced the interference of noise.

Operational amplification circuit adopts OPA2604AP amplifier chip, and signal to noise ratio easily exceedes 105 decibels, makes that the profile focus of audio frequency is more clear and noise is lower.

Brief description of the drawings

Fig. 1 is the high s/n ratio instant report recording console equipment electronic circuitry of the portable noise reduction of energy described in the utility model embodiment;

Fig. 2 is the electronic circuitry of the EMI filter circuit described in the utility model embodiment.

Embodiment

Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein is only for description and interpretation the utility model, and be not used in restriction the utility model.

As shown in Figure 1, the high s/n ratio instant report recording console equipment of the portable noise reduction of a kind of energy, comprises lithium battery group, switch, low frequency inductance, direct current transformation group, EMI filter circuit, operational amplification circuit, A/D converter and digital signal processing chip, the a end of low frequency inductance is connected with lithium battery group by switch, the b end of low frequency inductance is connected with direct current transformation group input, and direct current transformation group comprises 5 commutator transformers, these 5 be respectively+3v of commutator transformer commutator transformers, + 5v commutator transformer, + 9v commutator transformer, + 15v commutator transformer and-15v commutator transformer, and+3v commutator transformer, + 5v commutator transformer, + 9v commutator transformer, + 15v commutator transformer and-15v commutator transformer output be connected with the input of EMI filter circuit, output setting+3v splicing ear of EMI filter circuit, + 5v splicing ear, + 9v splicing ear, + 15v splicing ear, 6 splicing ears of-15v splicing ear and grounding connection terminal ,+3v splicing ear, + 5v splicing ear is connected with the digital circuit of A/D converter and digital signal processing chip composition with grounding connection terminal ,+9v splicing ear, + 15v splicing ear,-15v splicing ear is connected with operational amplification circuit with grounding connection terminal.

Wherein, direct current transformation group and EMI filter circuit are arranged in iron-clad.A/D converter adopts AK5393 chip, and digital signal processing chip adopts ADSP-21065L chip.Operational amplification circuit adopts OPA2604AP amplifier chip.

Supply line with+3v splicing ear ,+5v splicing ear ,+9v splicing ear ,+15v splicing ear ,-each group of 15v splicing ear avoids loop structure, further to reduce parasitic radio frequency induction noise.For example node A point voltage is supplied with after 2 of Node B and node C, between Node B and node C, just can not have link at 2, if there is link just to form loop, can produce parasitic radio frequency noise.

As shown in Figure 2, EMI filter circuit comprises high-frequency inductor, capacitor C 11, capacitor C 12, capacitor C 13 and capacitor C 14, and capacitor C 11 is connected with high-frequency inductor, and capacitor C 12, capacitor C 13 and capacitor C 14 are respectively at capacitor C 11 parallel connections.EMI filter circuit is made up of the element circuit shown in multiple Fig. 2, as shown in Figure 1.

The complicated variety in conjunction with noise in noise suppression link, parameter equilibrium, expander, several link integrated applications such as tone color compensation reach the effect that noise reduction signal to noise ratio improves, below to connect upper sound pick-up outfit, for reaching the consistency of test parameter, play the actual decibel parameter of measuring after recording with loudspeaker iterative cycles.

The noise reduction sound pick-up outfit that adopts battery-powered operation be necessary function to cinefilm sound recording, and existing equipment needs mains-supplied.

Table one, the test parameter table of comparisons:

Can see from table one, technical solutions of the utility model can make audio frequency signal to noise ratio improve at least 4 decibels of left and right by noise reduction, certainly can obtain higher or lower noise reduction by the adjusting of parameter, and this parameter testing fragment has judged reducing noise 60% with hearing loudness, audio quality has improved more than 30%.

Finally it should be noted that: the foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, although the utility model is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.All within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.

Claims

1. a high s/n ratio instant report recording console equipment for the portable noise reduction of energy, is characterized in that, comprises lithium battery group, switch, low frequency inductance, direct current transformation group, EMI filter circuit, operational amplification circuit, A/D converter and digital signal processing chip, the a end of described low frequency inductance is connected with lithium battery group by switch, the b end of described low frequency inductance is connected with direct current transformation group input, and described direct current transformation group comprises 5 commutator transformers, these 5 be respectively+3v of commutator transformer commutator transformers, + 5v commutator transformer, + 9v commutator transformer, + 15v commutator transformer and-15v commutator transformer, and described+3v commutator transformer, + 5v commutator transformer, + 9v commutator transformer, + 15v commutator transformer and-15v commutator transformer output be connected with the input of EMI filter circuit, output setting+3v splicing ear of EMI filter circuit, + 5v splicing ear, + 9v splicing ear, + 15v splicing ear, 6 splicing ears of-15v splicing ear and grounding connection terminal, described+3v splicing ear, + 5v splicing ear is connected with the digital circuit of A/D converter and digital signal processing chip composition with grounding connection terminal, described+9v splicing ear, + 15v splicing ear,-15v splicing ear is connected with operational amplification circuit with grounding connection terminal.

2. the high s/n ratio instant report recording console equipment of the portable noise reduction of energy according to claim 1, it is characterized in that, described EMI filter circuit comprises high-frequency inductor, capacitor C 11, capacitor C 12, capacitor C 13 and capacitor C 14, described capacitor C 11 is connected with high-frequency inductor, and described capacitor C 12, capacitor C 13 and capacitor C 14 are respectively at capacitor C 11 parallel connections.

3. the high s/n ratio instant report recording console equipment of the portable noise reduction of energy according to claim 1 and 2, is characterized in that, described direct current transformation group and EMI filter circuit are arranged in iron-clad.

4. the high s/n ratio instant report recording console equipment of the portable noise reduction of energy according to claim 3, is characterized in that, described A/D converter adopts AK5393 chip, and described digital signal processing chip adopts ADSP-21065L chip.

5. the high s/n ratio instant report recording console equipment of the portable noise reduction of energy according to claim 4, is characterized in that, described operational amplification circuit adopts OPA2604AP amplifier chip.