CN204329978U - A kind of apparatus for processing audio - Google Patents

Abstract

The utility model relates to a kind of apparatus for processing audio, comprises main control chip MCU, is connected the audio switch module controlled by MCU with MCU, and input with audio switch module, other Audio Input Modules, analogue audio frequency output module that output terminal is connected respectively; Also comprise GPS navigation voice input module, described GPS navigation voice input module is provided with digital audio interface, and this interface is connected with main control chip MCU by navigation speech testing circuit, is connected by navigation speech delay circuit with audio switch input end simultaneously.The utility model solves vehicle mounted multimedia signal by self circuit design and GPS navigation voice signal can only play separately the present situation that maybe must rely on the support of map software program and could freely switch, and facilitates user; Shorten product development process simultaneously, save time and cost, for enterprise brings good economic benefit.

Description

A kind of apparatus for processing audio

Technical field

The utility model relates to a kind of apparatus for processing audio, specifically refers to a kind of apparatus for processing audio having merged GPS speech navigation function.

Background technology

Along with developing rapidly of GPS navigation technology, GPS technology is used widely in all trades and professions, especially in vehicle electronics product, and such as car audio system.Existing car audio system contains abundant multimedia function, as: can DVD playing back/VCD/CD/MP3, bluetooth, radio reception etc., when increasing GPS navigation function, being equivalent to vehicle audio and also contains GPS navigation voice system.Prior art has following implementation to GPS navigation voice signal in car audio system:

1. single speech play pattern, refers to a kind of voice can only play separately in car audio system in each media.Compartment between each system, needs Non-follow control to realize switching between various voice, and this mode is for unusual trouble impracticable user.

2. more voice play mode, refer to that car audio system is when playing other multi-media voices, navigational system works simultaneously, and when there being navigation speech, system forwards navigation speech to and plays; At the end of navigation, automatically go back to multi-media voice and play.The implementation of this kind of design is as follows: before GPS will send navigation speech, map software can send instruction in advance and tell that main system opens navigation sound channel; After navigation speech terminates, map software sends instruction again and is given to main system, switches back original voice channel.This kind of mode needs map companies to do to coordinate, in map software program, do respective handling.This mode is concerning more convenient user, but shortcoming realizes Shi Xu navigation map development company and vehicle audio development company has coordinated, and the construction cycle is long, as uncooperatively in map companies just can not realize; And user is also restricted in replacing map software.

Summary of the invention

For the shortcoming of prior art, the purpose of this utility model is to provide one independently apparatus for processing audio, make car audio system realize to various multimedia audio and GPS navigation sound signal automatic, freely switch.

For achieving the above object, the technical scheme that the utility model is taked is: provide a kind of apparatus for processing audio, comprise main control chip MCU, be connected the audio switch module that controlled by MCU with MCU and input with audio switch module, other analogue audio frequency load module, analogue audio frequency output module that output terminal is connected respectively; Also comprise GPS navigation voice input module, described GPS navigation voice input module is provided with digital audio interface, and this interface is connected with main control chip MCU by navigation speech testing circuit, is connected by navigation speech delay circuit with audio switch input end simultaneously.

Described navigation speech testing circuit comprises ungated integrated circuit U1 and Sheffer stroke gate integrated circuit U2; When GPS module has navigation speech to export, output AC clock signal simultaneously, this clock signal one tunnel through not gate U1A, U1B twice oppositely after, the filtering circuit filtering be made up of resistance R7, electric capacity C2 becomes direct current signal, then is outputted to an input end of Sheffer stroke gate U2A by U1C, U1D successively; Another road is after U1A is reverse, and the filtering circuit filtering filtering be made up of resistance R8, electric capacity C1 becomes direct current signal, then outputs to another input end of U2A through U1E, U1F; Two signal phases and oppositely export to main control chip through U2B afterwards.Described navigation speech delay circuit comprises the signal lag chip circuit, the analog-digital chip circuit that are electrically connected successively with digital audio interface, and the GPS simulated audio signal that analog-digital chip circuit exports switches output by audio switcher.

The utility model achieves various multimedia audio in car audio system, comprises freely switching between broadcast audio and GPS navigation sound signal, residence GPS speech navigation function and multimedia recreation function in one, for user brings convenience; Simultaneously, for the enterprise producing vehicle mounted multimedia acoustic product, the realization of the utility model handoff functionality is no longer dependent on the cooperation of map software producer, product development, production and maintenance, maintenance can be completed separately completely by enterprise, shorten product development process, save time and cost, for enterprise brings good economic benefit.

Accompanying drawing explanation

Fig. 1 is principle of the present utility model composition schematic block diagram;

Fig. 2 is the testing circuit of navigation speech described in the utility model embodiment schematic diagram.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail:

As Fig. 1, described apparatus for processing audio comprises main control chip MCU, and MCU is connected with an audio switch module control end, controls audio switch and realizes switching the broadcasting of the sound signal of various input; The input end of audio switch receives the sound signal of various Audio Input Modules, which includes GPS navigation voice signal; Audio switch output terminal is connected with analogue audio frequency output module and playback equipment, sound signal is exported to playback equipment and broadcasts.

Implementation in the past needs map companies to do to coordinate, relative set is done: each before GPS will send navigation speech in map software, map software all will perform the special program segment arranged, and sends instruction in advance and tells that main system opens navigation speech passage, and then controls to send navigation speech; After navigation speech terminates, map software sends instruction again and is given to main system, switches back original voice channel.Map software program redundancy, complexity may be caused like this, debug difficulties etc.

In its tangible GPS module, have the digital audio interface agreement of a standard when navigation map plays voice, utilize this digital audio interface agreement to be can realize navigation speech input completely.While navigation speech is play, musical audio digital interface there are the L/R clock signal accompanying audio data of a standard export simultaneously, the utility model is exactly effectively make use of this clock signal: connect a signal deteching circuit at the L/R clock signal output terminal of the musical audio digital interface of GPS module, i.e. navigation speech testing circuit, this circuit other end connects main control chip; And exporting termination one signal delay circuit at the voice data of musical audio digital interface, this circuit output end connection digital-to-analogue turns (D/A) and changes chip circuit.

Described navigation speech testing circuit can adopt circuit as shown in Figure 2.When exporting without navigation speech, regardless of above input signal, it is all low level that U2B exports.When there being navigation speech to export, it is the square-wave signal of 50% that L/R clock signal output terminal exports a pulse duration ratio simultaneously, this signal one tunnel is after not gate U1A, U1B, the filtering circuit filtering be made up of resistance R7, electric capacity C2 becomes direct current signal, outputted to an input end of Sheffer stroke gate U2A more successively by U1C, U1D, at this moment signal is high level; Another road is after U1A is reverse, and the filtering circuit filtering be made up of resistance R8, electric capacity C1 becomes direct current signal, then outputs to another input end of U2A through U1E, U1F, and at this moment signal is low level; Two signal phases and oppositely become high level again after U2B afterwards.

After main control chip detects this high level signal by testing circuit, judge have navigation speech signal to send, then control audio switch module and open navigation sound channel.Because navigation speech data-signal sends with clock signal simultaneously, therefore, need add delay circuit at navigation speech data signal output, navigation speech signal lag is sent, the navigation data exported before avoiding opening navigation passage is lost.After navigation terminates, L/R clock signal disappears, and can't detect L/R clock signal in testing circuit a period of time, and judge that navigation terminates, gauge tap switches back former voice channel.

Described navigation speech delay circuit can adopt delay chip TPA5052, and it is the digital audio and video signals chronotron that can arrange a time delay.This chip output joins a digital-to-analogue (D/A) conversion chip, converts simulated audio signal to for the digital audio and video signals exported, and finally by audio switch, the simulated audio signal after conversion is outputted to playback equipment and broadcasts.

It should be noted that; the testing circuit of navigation speech described in the utility model and navigation speech delay circuit can have multiple specific implementation; can postpone and circuit all replaceable the utility model embodiment circuit of measuring ability by settling signal in the prior art; it should be noted that; do not departing under the utility model concept thereof, any simple circuit is replaced and is all belonged to protection domain of the present utility model.

Claims (4)

1. an apparatus for processing audio, comprise main control chip MCU, be connected with MCU controlled by MCU audio switch module, input with audio switch module, other analogue audio frequency load module, analogue audio frequency output module that output terminal is connected respectively, it is characterized in that: also comprise GPS navigation voice input module, described GPS navigation voice input module is provided with digital audio interface, this interface is connected with main control chip MCU by navigation speech testing circuit, is connected by navigation speech delay circuit with audio switch module input simultaneously.

2. apparatus for processing audio according to claim 1, is characterized in that: described navigation speech testing circuit comprises ungated integrated circuit U1 and Sheffer stroke gate integrated circuit U2; When GPS module has navigation speech to export, output AC clock signal simultaneously, this clock signal one tunnel through not gate U1A, U1B twice oppositely after, the filtering circuit filtering be made up of resistance R7, electric capacity C2 becomes direct current signal, then is outputted to an input end of Sheffer stroke gate U2A by U1C, U1D successively; Another road is after U1A is reverse, and the filtering circuit filtering filtering be made up of resistance R8, electric capacity C1 becomes direct current signal, then outputs to another input end of U2A through U1E, U1F; Two signal phases and oppositely export to main control chip through U2B afterwards.

3. according to the apparatus for processing audio described in claim 2, it is characterized in that: described navigation speech delay circuit comprises the signal lag chip circuit and analog-digital chip circuit that are electrically connected successively with digital audio interface.

4. according to the apparatus for processing audio described in claim 3, it is characterized in that: described signal lag chip circuit adopts delay chip model to be TPA5052.