SU1234982A1 - Stereo sound reproducing system - Google Patents

Abstract

The invention relates to radio engineering and communications and can be used in systems for; stereophonic sound of large volume rooms. The quality of the stereo sound reproduction is achieved by eliminating the narrowing of the stereo panorama with the stereo effect area unchanged. The device contains a series-connected adder 1, a controlled attenuator (UA) 2, a low-frequency amplifier 3 and a loudspeaker (D) 4 of the additional channel, and a control unit (CU) 5 consisting of a subtractor 6, an adder 7, two detectors 8 and 9, the analog splitter 10, the integrator 11, and the driver of the control signals 12. The level of the signal emitted by G 4 is adjustable. This eliminates the narrowing effect of stereo panorama G 4. The level of the signal emitted by G 4 is controlled by AU 2. The signals generated by AU 5 are used to control the AC 2 transfer. The goal is achieved by introducing AU 2 and CU 5. 1 Il. ho sg Yu from 4: CO 00 1chE

Description

The invention concerns radio equipment and communications, in particular stereo, and can be used in systems for the stereo sound of large spaces.

The aim of the invention is to improve the quality of stereo sound reproduction by eliminating the narrowing of stereo panorama with a constant zone of stereo effect.

The drawing shows a structural electrical circuit of a stereo sound reproducing system.

The stereo sound reproducing system contains the first totalizer 1, the controlled attenuator 2, the low frequency amplifier 3, the loudspeaker 4 of the additional channel and the control unit 5 containing the subtractor 6, the second adder 7, the first and second detectors 8 and 9 , analog divider 10, integrator 11, and driver 12 of the control signals.

The stereo sound reproducing system works as follows.

The level of the signal emitted by loudspeaker 4 is adjustable. If the source signals are equal in level (this condition corresponds to the localization of the sound source in the position of loudspeaker 4), then the level of the latter has the maximum value (0.5-0.7) of the sum of the signals of the left and right channels. In this case, all loudspeakers of the system emit equal-volume signals. If one of the input signals of the stereo pair is equal to O (or is reduced relative to the other by a value of about 20 dB or more), then in this case the sound source should be located in the position of the outermost loudspeaker. To achieve this condition, the signal level: speaker 4 is lowered (relative to its maximum value by tiwHy of the order of 20 dB). This eliminates the stereoscopic effect of loudspeaker 4. In intermediate situations, the signal level of the additional channel is determined by the ratio of the intensity of the signals of the left and right channels.

In the system, the level of the signal emitted by the speaker is controlled by a controlled 4

by the numerus 2. The latter is connected between the first adder 1 and the amplifier 3, which supplies the loudspeaker 4.

The inputs of block 5 receive signals from the main adjacent channels of the stereo sound reproduction system. For example, the left L and right R signals for a two-channel stereophonic sound reproduction system. At the output of the subtractor 6, we have the difference of the input signals; at the output of the first adder 7, respectively, their sum. Then each of these signals goes to the corresponding first and second detectors 8 and 9. Signals from the output of the first and second detectors 8 and 9 go to the corresponding inputs of the analog divider 10, at the output of which we have the ratio of the voltage of the difference and the sum of the left and right signals channels.

The signal from the output of the divider 10 through the integrator 11 is fed to the input of the 5 5 1Water 12, at the output of which a signal is used that is used to control the transmission coefficients of the controlled attenuator 2.

Claims (1)

30 claims The stereo sound reproducing system, containing the first adder and the subsequent connected 35 a low-frequency amplifier and an additional channel loudspeaker, characterized in that, in order to improve the quality of the stereo sound output by 40 eliminating the narrowing of a stereo-pan when the stereo effect zone is unchanged, a controlled attenuator is inserted into it, which is connected between the output of the first adder and the input of the low-frequency amplifier, and the control unit, the first and second inputs of which are combined respectively with the first and second inputs of the first adder and the output of the control unit is connected to 50 control input of the controllable irooaTopa, wherein the control unit contains a series-connected subtractor and a first detector, the output of which is connected to the input of the dividend 55 analog divider, as well as serially connected second adder and second detector, the output of which is connected to the divider analog input312349824 A gob divider, the output of which through the common first inputs of the subtractor and the integrator is connected to the forcing of the second adder, and the second 1 input of control signals, the output of which the control unit are combined, is the output of the control unit, the second inputs of the subtractor and the second input of which is volume of the adder.