CN2342537Y

CN2342537Y - Digit control household sound equipment

Info

Publication number: CN2342537Y
Application number: CN 98232961
Authority: CN
Inventors: 李锡放
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-08-26
Filing date: 1998-08-26
Publication date: 1999-10-06
Anticipated expiration: 2008-08-26

Abstract

The utility model relates to digit control household sound equipment which mainly solves the problems of the existing sound equipment that service life is short as contacts are oxidized, noise is easy to introduce, and the function that mixed sound is simultaneously input from a plurality of signal sources can not be completed. The utility model is composed of a mixed sound IC circuit which adopts electronic conversion and electronic gain control and an electronic frequency demultiplier which is composed of an active filter. A high pitch, a middle pitch and a low pitch loudspeakers are directly pushed by the power amplification of all demultiplied circuits, so that the three-dimensional space surround sound of two sound boxes is realized. The utility model has the advantages of no contacts, no noise distortion, small power consumption and the capability of high-fidelity tone obtainment. The utility model can be used for household sound systems.

Description

A kind of digital control family expenses stereo set

The present invention relates to electronic equipment, particularly a kind of digital control family expenses stereo set.

Traditional family expenses stereo set is mainly by the source of sound switch, and audio processing, effect, frequency division and the high pitch of L, R passage, medium and low spectrum loudspeaker are formed, as shown in Figure 5.Wherein the source of sound switching is equivalent to the double-pole multithrow switch, and potentiometer is L, the R channel volume of duplex adjusted in concert, and audio is handled can comprise frequency equilibrium, dolby pro logic, SRS is multi-mode perhaps, changes then into power amplification, and the signal after the amplification is received on the loud speaker by dividing network.

There is following shortcoming in the sound system of this pattern:

1. the source of sound switching mostly is contact, and there are oxidation and life problems in the contact, and easily introduces noise when switching;

2. the switch of this line-disparting type can only be finished from the function of one of a plurality of signal sources selection, can not finish simultaneously from such " audio mixing " function of the common input of a plurality of signal sources;

3. potentiometer also is a contact, wear and tear easily and introduce noise, and two the tunnel is difficult for fully synchronously;

4. frequency divider mostly is the LC network of discrete component, and loss is big, and distortion is big, and parameter is not easy control, and phase shift is arranged, and directly influences tonequality.

The purpose of this utility model is to overcome the deficiency of above-mentioned prior art, provides a kind of switching not have noise, can import " audio mixing " simultaneously from a plurality of sources of sound, and frequency division control accurately, and lossless output can be obtained a kind of digital control family stereo set of high-fidelity tonequality.

Realize the technical solution of the utility model, be to adopt digital technology to change source of sound switching and volume potentiometer into electronics switches and electron gain is controlled audio mixing IC circuit, frequency divider adopts the Active crossover device that is made of active filter, power amplifier adopts high pitch and middle bass effect along separate routes, active filter is connected between sound effect processor and each the road power amplifier, the other end of each road power amplifier respectively with high pitch loudspeaker and in, woofer connects, a plurality of signal source A, B, C, after D enters the audio processing by audio mixing IC, enter the active filter frequency division, signal behind the frequency division send into simultaneously each road power amplifier directly promote high pitch with in, woofer is to realize the three dimensions surround sound of two audio amplifiers.

Reverberation IC in the said equipment is provided with output port, can directly audio signal be outputed to follow-up sound pick-up outfit by this port.

Audio mixing IC in the said equipment, audio processing IC, active filter is connected with microprocessor CPU respectively, by CPU the each several part circuit is controlled.

The utlity model has following effect and advantage:

1. because complete machine adopts digital controlly, not only exempted contact oxidation and the defective of introducing noise, and realized simultaneously revealing and intelligent from the oncontacting that a plurality of signal sources are imported sound mixing function and complete machine jointly;

2. owing in mixer, be provided with output port, thereby can make traditional stereo set increase the function of family expenses mixer or family expenses sound console again, promptly when editor takes the photograph facies tract, in can recording at the scene, add accompaniment and commentary;

3. owing to adopt the Active crossover device of the band phase compensation of active ripple device formation, and straighten hard and connect the promotion loud speaker, reduced distortion and power loss, tonequality is reproduced naturally, promptly reproduce the sound on very thin trickle sound and huge row mountain, to obtain the high-fidelity acoustical quality;

4. owing to adopt each road power amplifier behind the frequency division, thereby reduce the equipment total power capability, promptly under equal hi-fi effect, saved the energy;

5. owing to the main IC chip that uses in the complete machine, so help the product mass industrialized production.

Below in conjunction with the accompanying drawing progress structure of the present utility model is described

Fig. 1 is the whole block diagram that connects of the present utility model

Fig. 2 is an audio mixing IC circuit diagram of the present utility model

Fig. 3 is two divided-frequency active filter circuit figure of the present utility model

Fig. 4 is three frequency division active filter circuit figure of the present utility model

Fig. 5 is the whole connection layout of traditional stereo set

Referring to Fig. 2, sound source signal is sent into U through AV1 ₂, behind control, audio mixing, by

U

₂14,15 pin output, be defined as M1X-L respectively, MIX-R.MIX-L, the MIX-R signal can be sent into sound effect processing circuit, such as NJM2178, NJM2180, SRS5250, QS7777 etc. (physical circuit is referring to the preferred circuit of these IC).In addition, this equipment provides one group of stereo-mixing output signal, and by MIX-L, MIX-R isolates the amplification thing through U17, through AV ₂Output.

Referring to Fig. 3, the signal L-OUT after audio is handled, R-OUT sends into HB respectively ₃, HB ₄Carry out the active electronic frequency division, the signal behind the frequency division is through U ₁₃Handle after J ₅Send, give RL, RL, LL, LH, this four road signal can send into four groups of power amplifiers respectively and amplify directly promotion loud speaker of back, such power amplifier can be used integrated amplifier IC, as LM3875, and LM3876, LM3886, LM4700, LM1876, TDA7294 etc., the also circuit that can constitute with discrete component.

Referring to Fig. 4, the signal L-OUT after audio is handled, R-OVT sends into HB respectively ₃And HB ₄, HB ₄The signal of output is through HB ₆, HB ₇After the processing, send into U ₁₃, finally obtain high frequency, intermediate frequency, the low frequency of R channel, RH, RM, RL three road signals, HB ₃The signal of output is through HB ₈, HB ₉After the processing, send into U ₁₈, finally obtain high frequency, intermediate frequency, the low frequency of L channel, LH, LM, LL three road signals.RM, RH, LM, LH is through J ₅Deliver to power amplifier, LL, RL is through J ₆Deliver to power amplifier.Concrete power amplifier can be used integrated amplifier IC, and model is the same, the circuit that also available discrete component constitutes.

Claims

1. digital control family expenses stereo set, comprise the source of sound switch, sound effect processor, frequency divider, power amplifier and loud speaker, it is characterized in that switch adopts electronics to switch and the audio mixing IC circuit of electron gain control, frequency divider adopts the Active crossover device that is made of active filter, power amplifier adopt high pitch with in, bass shunt power amplifier; Active filter is connected between sound effect processor and each the road power amplifier, the other end of each road power amplifier respectively with high pitch loudspeaker with in, woofer is connected; A plurality of signal sources enter the active filter frequency division after entering audio and handle by audio mixing IC, the signal behind the frequency division send into simultaneously each road power amplifier directly promote high pitch with in, woofer, to realize the three dimensions surround sound of two audio amplifiers.

2. stereo set according to claim 1 is characterized in that audio mixing IC is provided with output port, and the output audio signal is given sound pick-up outfit.

3. stereo set according to claim 1 and 2 is characterized in that audio mixing IC, and audio processing IC, active filter are connected with microprocessor CPU respectively, by the work of CPU control each several part.