Production of SRS active antimagnetic speakers 01

GP--SRS-1 active anti-magnetic speaker is mainly composed of input circuit, SRS signal processing circuit, tone control circuit, power amplifier
circuit, power supply and speaker protection circuit and speaker unit circuit, etc. It is briefly described as follows:
    (1) The signal input loop and SRS signal processing circuit are shown in Figure 9-76. In order to adapt to different audio source signals, this circuit is designed for two sets of inputs. The CD
input terminal in the figure is CD/LI)/VCD/CVD/SV CD /DVD The AUX input terminal can input low-level signals such as video recorders, televisions, portable Xin boxes, computer sound cards, etc.; SRss2sos is produced by the American SEPONIX company and is developed and licensed by SRS LABS. It is the most standard three-dimensional sound processing chip that implements SRS (3D) sound reproduction system . It is a 28-pin SOP chip package and its operating voltage is 8~13V. The working current is only 2 2:mA. In order to improve its working stability, this system uses 781. , 09 three-terminal voltage regulator to power it. In Figure 9-76, 1RP1 is the center signal adjustment, which can adjust the center sound field positioning of vocal dialogue and concert singing in the film; 1RP2 is the environment width adjustment , which can adjust the distance between the audience and the environmental sound field and the size of the sound field; Iso is the playback mode switch: "PYPASS" is the pass-through mode, which is equivalent to the ordinary stereo playback mode, "SRS" is the SRS signal processing method 6. After actual use (in order to facilitate the upgrade of existing playback equipment, Feng Design specially designed all the circuits in Figure 9·76 in the form of a single printed board. The actual size of the printed board is only 6.75×8. 35cm. This board can be easily installed on the original stereo equipment or ordinary AV equipment. Or in front of the tone circuit of Dolby AV equipment, and connect 12 to 18V DC power supply to the 1XS2 terminal, the original equipment can be upgraded to a playback system with SRS sound effect processing function. The original system can be installed with SRS according to the above method After adding the signal processing circuit), its environmental sound effect has been significantly improved compared to before, making many details that could not be heard or heard clearly before vividly expressed. The sound field is wide and wide, and the "emperor position" of the sound is wider. It fully reflects the unprecedented value-for-money enjoyment brought by SRS technology.