CN2419778Y - Active earphone with echo effection - Google Patents

Abstract

The utility model relates to an active earphone with a surround sound playing effect, which is composed of a microphone, an active handler, a mode selection key, a volume control key and an earphone which are connected by a signal line, wherein the mode selection key and the volume control key are arranged on a casing of the active handler. A circuit is composed of an amplification circuit, an A/D and D/A conversion circuit, an SCM, a storage unit, a control circuit and an output protection circuit which are linked to each other via each signal line. In the utility model, the active handler processed by full electronic elements and full digital signals is adopted, an acoustic field is extended, and the naturalness degree of sound playing is put forward. The utility model has the effect of surround sound playing, and in addition, and the utility model has the advantages of small volume, big dynamic range, broad frequency response and high signal-to-noise ratio, etc.

Description

Active earphone with surround sound result of broadcast

The utility model is the active earphone with surround sound result of broadcast, belongs to stereo and the digital audio processing technology, is again the daily culture daily necessities.

Along with the development of multimedia signal processing technique and level of hardware, people are also more and more higher to the requirement of music and audio visual effect.Traditional mono headset has only a sound channel, and playback sound has no third dimension, width sense and the sense that distributes; Though common stereo double channel earphone can recover stereosonic effect to a certain extent, but because the sounding point is positioned at people Er Nei, the distribution sense of playback sound is still good inadequately, and the sound perception of hearing all concentrates on brain inside, naturalness is not high, does not have surrounding effect.

Though the purpose of this utility model is exactly to exist playback sound not have third dimension, width sense, distribute and feel or stereophonic effect arranged in order to overcome and to solve existing common single, double sound channel earphone, but the sense that distributes still good inadequately and acyclic shortcoming and problem around effect etc., research and design is a kind of to be had has source processor that sound is handled, with reach the expansion sound field, dynamic range is big, frequency response is wide, improve naturalness, realize the active earphone with surround sound result of broadcast of real surrounding sound effect.

The utility model is realized by following technical proposals: have the surround sound result of broadcast active earphone the contour structures schematic diagram as shown in Figure 1; Its circuit block diagram as shown in Figure 2; Its software program flow process block diagram as shown in Figure 3; Its interrupt service routine block diagram as shown in Figure 4, its signal handler flow diagram is as shown in Figure 5; Its circuit theory diagrams as shown in Figure 6; It by microphone (pick-up) 1, have source processor 2, mode selecting key 3, volume control key 4, earphone 5 to connect and compose jointly, its interconnected relationship is: have source processor 2 to be connected with microphone 1, earphone 5 respectively by audio signal wire respectively, mode selecting key 3, volume control key 4 have been loaded on respectively on source processor 2 shells and with the source processor related circuit is arranged and have been connected; Its circuit is connected and composed jointly by amplifying circuit, A/D change-over circuit, singlechip CPU, memory cell, control circuit, D/A change-over circuit, output protection circuit, and its interconnected relationship is: amplifying circuit is connected with microphone 1, A/D change-over circuit respectively by audio signal wire respectively; The digital signal incoming line of the digital signal output line that singlechip CPU is changed by A/D respectively, storage holding wire, control signal wire, D/A conversion is connected with A/D change-over circuit, memory cell, control circuit, D/A change-over circuit respectively; Output protection circuit is connected with D/A change-over circuit, earphone respectively by audio analog signals output line, audio signal wire respectively; Wherein: amplifying circuit is by integrated package U ₄, resistance R ₁₀～R ₁₃, capacitor C ₁₀～C ₁₅Connect and compose jointly; A/D change-over circuit D/A change-over circuit is by ic chip ₁, capacitor C ₃₀～C ₃₈Connect and compose jointly; Singlechip CPU is by the high-speed digital signal processor ic chip ₂Constitute; Memory cell is by the flash memories ic chip ₄Constitute; Control circuit is by mode selecting key S ₁～S ₆Connect and compose jointly; Output protection circuit is by capacitor C ₂₀～C ₂₁, resistance R ₂₀～R ₂₁Connect and compose jointly.

Simple operation principle of the present utility model is as follows: the single-chip microcomputer in the circuit has sheet internal program memory and the data storage of 16K, dominant frequency reaches as high as 40MHz, be a kind of price, the reasonable digital signal processing chip of performance, be suitable for as high speed digital signal processor; Memory cell is a flash memory, is used for the required code book of stored program and program; Control module comprises volume adjustment and model selection, is all realized by number control; The A/D of analog interface, D/A conversion realizes with chip piece, selected ADSP1847 is A/D, the D/A conversion of 16 of two-ways, the form of its digital code stream is consistent with the pattern of the input of serial port of single chip computer, is used with ADSP with it to reach the highest efficient.When the utility model powered up, read-in programme was to ram in slice from memory for single-chip microcomputer, and program (software program flow process block diagram as shown in Figure 3) brings into operation after running through, and prepares flash memory is read and write.At this moment A/D starts working, data are delivered to the serial port of single-chip microcomputer, the data of the machine-readable serial port of monolithic, carry out real-time processing, data are exported in conversion through D/A then, the working method of control module comprises volume adjustment and model selection, by mode of operation or the adjustment volume of single-chip microcomputer according to the input selection of control module, when changing, the control switch state produces an interruption, the machine-readable PF mouth of monolithic is pressed to determine which button in interrupt service routine (the program circuit block diagram of interrupt service routine as shown in Figure 4), and calls in corresponding handling procedure (the signal handler flow diagram as shown in Figure 5).If volume is adjusted button, then the value with the volume accumulator correspondingly increases or reduces; If the model selection button is then called in corresponding mode treatment program, selectable pattern comprises: (1) normal stereo pattern; (2) normal stereo enhancement mode; (3) virtual surround sound music pattern; (4) virtual surround sound theater mode.Wherein the normal stereo pattern does not have special processing, only carries out the removal of infrasonic elimination and direct current signal by Digital High Pass Filter; Stereo enhancement mode has increased " standard " surround sound on this basis and has strengthened module, to strengthen surrounding sound effect; The virtual surround sound pattern is further introduced means expansion sound fields such as HRTF, digital reverberation, and wherein music pattern is mainly used to promote the Sensurround and the outside sense of music, and theater mode is mainly used to strengthen distribute sense and position sense, makes the people obtain the impression that body faces its environment.

The utility model compared with prior art, have following advantage and beneficial effect: the characteristics of the utility model maximum are that it has source processor, this processor is owing to adopt electronic devices and components to constitute fully, and all processing procedure is a Digital Signal Processing, therefore have following advantage: (1) volume is little: processor structure is simple, entire circuit can be integrated on about 3～5 centimetres squares circuit board, compares with common active earphone to need not to add the effect that burdensome equipment just can be play surround sound; (2) dynamic range is big: adopt the linear coding of 16 bits, dynamic range can reach about 90dB; (3) frequency response range is wide: frequency response range only is subjected to the frequency band limits of digital high-pass filter, and the cut-off frequency of high pass filter is 20Hz, so its Hz-KHz can be from 20Hz to 20kHz; (4) signal to noise ratio height: the high pass filter filtering direct current and infrasound composition, improved signal to noise ratio greatly.Especially to music or visual sound accompaniment such as digital mode compression standards such as MPEG-1, MPEG-2, Dolby AC-3, effect is more remarkable; (5) this earphone has been expanded sound field, has improved sound and has play naturalness, and the utility model is the earphone with surround sound result of broadcast, has the advantage that conventional earphone can't match in excellence or beauty, and is the consumption electronic product of a new generation.

Below Figure of description is further specified as follows: Fig. 1 is the contour structures schematic diagram with active earphone of surround sound result of broadcast; Fig. 2 is its circuit block diagram; Fig. 3 is its software program flow process block diagram; Fig. 4 is its interrupt service routine flow diagram; Fig. 5 is its signal handler flow diagram; Fig. 6 is its circuit theory diagrams, and each same numeral point should be connected among the figure.

Execution mode of the present utility model can be as follows: (1) is by Fig. 2 and shown in Figure 6 entire circuit is integrated in 5cm ²Circuit board, wherein: the ADSP2181 of the optional AD of single-chip microcomputer company; The optional LM358 type of amplifier U4; A/D, D/A change the ADSP1847 of optional AD company; The flash memories Am29032 of the optional AMD of memory IC4; The integrated good circuit board of assembling is installed in the plastic casing, more small 95B04A2FAR pattern formula options button 3 and small CR-2510K type volume control key 4 is loaded on shell and is connected, just made source processor with related circuit; (2) by the shown in Figure 1 and top described annexation of specification, there being source processor 2 to be connected, wherein: microphone 1 optional AIWA type with microphone 1 and earphone 5; Earphone 5 optional AIWA types have so just been implemented the utility model preferably.

Claims (2)

1, a kind of active earphone with surround sound result of broadcast, it is characterized in that: it by microphone (1), have source processor (2), mode selecting key (3), volume control key (4), earphone (5) to connect and compose jointly, its interconnected relationship is: have source processor (2) to be connected with microphone (1), earphone (5) respectively by audio signal wire respectively, mode selecting key (3), volume control key (4) have been loaded on respectively on source processor (2) shell and with the source processor related circuit is arranged and have been connected; Its circuit is connected and composed jointly by amplifying circuit, A/D change-over circuit, singlechip CPU, memory cell, control circuit, D/A change-over circuit, output protection circuit, and its interconnected relationship is: amplifying circuit is connected with microphone (1), A/D change-over circuit respectively by audio signal wire respectively; The digital signal incoming line of the digital signal output line that singlechip CPU is changed by A/D respectively, storage holding wire, control signal wire, D/A conversion is connected with A/D change-over circuit, memory cell, control circuit, D/A change-over circuit respectively; Output protection circuit is connected with D/A change-over circuit, earphone respectively by audio analog signals output line, audio signal wire respectively.

2, by the described a kind of active earphone of claim 1, it is characterized in that described amplifying circuit is by integrated package U with surround sound result of broadcast ₄, resistance R ₁₀～R ₁₃, capacitor C ₁₀～C ₁₅Connect and compose jointly; A/D change-over circuit D/A change-over circuit is by ic chip ₁, capacitor C ₃₀～C ₃₈Connect and compose jointly; Singlechip CPU is made of high-speed digital signal processor integrated package ADSP2181; Memory cell is by the flash memories ic chip ₄Constitute; Control circuit is by mode selecting key S ₁～S ₆Connect and compose jointly; Output protection circuit is by capacitor C ₂₀～C ₂₁, resistance R ₂₀～R ₂₁Connect and compose jointly.

Images