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环绕声信号流程 环绕声是指能在重放的声场使人们对声源有明显的方向感以及伴随声音的环绕感和扩张感。C2919P型机采用时间延迟式环绕声音频输出电路,即经伴音解调的左右声道音频信号或者由AV端子输入的其它音源的双声道信号,经放大加至环绕声电路的输入端,经差信号电路变为(L-R)信号,再经移相输出φ(L-R)信号,该信号分为两路:一路同时送至加法器和减法器与原有的L、R信号相混合,产生L+φ(L-R)和R-φ(L-R)信号(这里需要说明一下:这里的L+φ(L-R)和R-φ(L-R)信号就是所谓的立体声左、右声道输出信号,它们并不是真正的电视广播的立体声信号,它是由输入单声道伴音信号经移相、相加、相减模拟出来的,因而称之为伪立体声,该机不具有真正的立体电视广播接收功能,只有伪立体声处理能力),这种伪环绕立体声分别经功率放大后作为主声源由4个主扬声器放音。从环绕声电路输出的φ(L-R)信号的另一路
Surround Sound Signal Surround refers to the sound field in the playback so that people have a clear sense of the direction of the sound source along with the sound of the sense of surround and expansion. The C2919P uses a time-delayed surround-sound audio frequency output circuit, that is, the left and right channel audio signals via audio demodulation or the dual channel signals of other sound sources input from the AV terminal are amplified and added to the input of the surround sound circuit, The difference signal circuit becomes the (LR) signal, and then outputs the φ (LR) signal through the phase shift. The signal is divided into two paths: one is simultaneously supplied to the adder and the subtracter to be mixed with the original L and R signals to generate L (LR) and R-φ (LR) signals (here it is necessary to explain: The L + φ (LR) and R-φ (LR) signals here are the so-called stereo left and right channel output signals, Real TV broadcast stereo signal, it is by the input mono sound signal by the phase, add, subtract the analog out, so called pseudo-stereo, the machine does not have the real stereo broadcast reception, and only Pseudo-stereo processing capabilities), this pseudo-surround sound by the power amplifier as the main source by the four main speakers to play. The other way is the φ (L-R) signal output from the surround circuit