SU1764188A1 - Stereophonic acoustic system - Google Patents

Description

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(21) 4842406/10 (22) 07.05.90 (46) 09/23/92. Bul N 35 (71) Research and Development Institute of consumer electronic equipment (72) A.I. Osadtsiv

(56) Japanese Journal of Demp Kagaku, No. 3, 1979, p. 132-136.

(54) STEREOPHONIC ACOUSTIC SYSTEM

(57) Refers to electronic equipment, in particular to electroacoustic devices. An acoustic system consists of a dynamic loudspeaker including terminals 1, 2 for connecting the left and right channels of a stereo low-frequency amplifier, capacitors 3 and 5, low-frequency transformer 4, head of loudspeaker 6 and two loudspeakers 7 and 8 of medium-high frequencies, 1 Il.

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The invention relates to electronic equipment, in particular to electro-acoustic devices.

A stereo speaker system is known, comprising one dynamic subwoofer and two dynamic mid-range loudspeakers. The subwoofer filters, biases and reproduces low-frequency signals from two channels of a stereo low-frequency amplifier, and in the corresponding medium-low frequency loudspeaker, filters the playback of medium-high frequencies from the corresponding kanana stereo low-frequency amplifier 1.

Such a speaker system has a very complex loudspeaker head, since the signals are shifted by elements of the loudspeaker head - two voice coils. In addition, a known acoustic system has bulky filter circuits.

The closest in technical essence is a stereo speaker system containing one dynamic subwoofer and two dynamic loudspeakers of medium-high frequencies. The subwoofer contains filter circuits for filtering the signal from the corresponding channel of the stereo low-frequency amplifier, a circuit for mixing the signals of two channels on two low-frequency transformers, and a loudspeaker head. Medium-high frequency loudspeakers contain filter circuits and a loudspeaker head. The filter circuits include two capacitors, with one output of the first medium-frequency loudspeaker connected to a capacitor, and the second output to one of the inputs of the first channel, one output of the second medium-frequency loudspeaker connected to one of the inputs of the second channel 2.

A known acoustic system has a low efficiency due to the loss of a signal on the filter circuits and the mixing circuit and the bulkiness of the filter circuits and the mixing circuit.

The aim of the invention is to simplify the design and reduce the power loss of the signal.

The goal is achieved by the fact that in a stereo speaker system containing a head of a low frequency loudspeaker, two loudspeakers of middle frequencies, low frequency

a transformer and two capacitors, with one output of the first medium-frequency loudspeaker connected to a capacitor, and the second output - to one of the inputs

the first pump, one output of the second medium-frequency loudspeaker is connected to one of the inputs of the second channel, according to the invention, the second output of the second medium-frequency loudspeaker is connected

with the connection point of the first medium-frequency loudspeaker with a capacitor connected by another terminal to the common bus and one of the terminals of the first winding of the low-frequency transformer,

The second terminal of which is connected to the input terminal of the first channel, while the second winding is connected via one of the outputs through a parallel connected low-frequency loudspeaker head and the second capacitor to the common bus, and the other output to the terminal of the second channel.

A comparative analysis with the prototype showed that the proposed acoustic system differs from the prototype by using B as an element of the low-frequency filter of the low-frequency transformer dissipation and the new connection of medium-frequency speakers to the low-frequency

loudspeaker.

Thus, the proposed speaker system meets the criteria of the invention of novelty.

Signs that distinguish the claimed technical solution from the prototype are not identified in other technical solutions when studying this and related areas of technology and, therefore, provide the claimed solution with the criterion

significant differences.

The essence of the invention is that the capacitor and the leakage inductance of the low-frequency transformer are simultaneously low-frequency.

a filter for signals from both channels of a stereo low-frequency amplifier, and a capacitor is at the same time an element of the mid-range filters of both loudspeakers

medium high frequencies

The invention is illustrated in the drawing, which is a diagram of a stereo speaker system.

An acoustic system consists of a dynamic loudspeaker including terminals 1, 2 (for connecting the left and right channels of a stereo low-frequency amplifier), capacitors 3 and 5, low-frequency transformer 4, the head

loudspeaker 6 and two loudspeakers 7, 8 medium-high frequencies.

Stereo speaker system works as follows.

When signals from the stereo low-frequency amplifier enter inputs 1.2, signals from input 2 simultaneously arrive at the input of a low-pass filter formed by capacitor 3 and the leakage inductance of low-frequency transformer 4 (the inductance of the low-frequency transformer windings becomes equal to the leakage inductance as a result of shunting the windings to a very small output resistance of the stereo low-frequency amplifier) and to the input of the loudspeaker 8 medium-high frequencies, the filter element to The capacitor 5 is expensive. The low-frequency signals are filtered and reproduced by the head of the loudspeaker 6, and the signals of the mid-high frequencies are filtered and reproduced by the loudspeaker 8. At the same time, the signals of its input 1 are fed to the winding of the low-frequency transformer 4 and to the input of the loudspeaker 8 of the medium-high frequencies, whose filter element is capacitor 5. The low-frequency signals are transformed into the secondary winding, filtered by the same filter (capacitor 3 and low-frequency dissipation inductance ansformatora 4) and the reproduced head loudspeaker 6 (the signal passing circuit - the parallel connection of the capacitor 3 and a head of the speaker 6 - channel output impedance of the amplifier low pass - inductance scattering), i.e. On the head of the loudspeaker 6, the low-frequency signals from both channels of the stereo low-frequency amplifier are mixed. The mid-frequency signals from input 1 are filtered by a medium-high frequency filter, of which capacitor 5 is an element, and reproduced by loudspeaker 7 of middle-high frequencies.

In this way, the introduction of an additional inductance into the low-pass filter circuit, introducing additional signal power losses, is eliminated, thereby increasing the efficiency of the dynamic speaker and the acoustic system as a whole and simplifies the filter circuit. In addition, the use of one capacitor as an element of medium-frequency filters for both loudspeakers of medium-high frequencies instead of two (each for the corresponding loudspeaker of medium-high frequencies) also simplifies the scheme of a stereophonic speaker system. In the end result, this solution reduces the weight and dimensions of the speaker system.

Claims (1)

A stereo acoustic system comprising two mid-range loudspeakers and one low-frequency loudspeaker, including two medium-high loudspeaker heads and one low-frequency loudspeaker head, a low-frequency transformer, two capacitors, one speaker connected in parallel with a loudspeaker, one speaker, one low-frequency transformer, two capacitors, one speaker with one loudspeaker connected in parallel with a speaker, input terminals of the first and second channels connected to the outputs of two medium-frequency loudspeaker heads, common buses y, characterized in that, in order to simplify the design and reduce the signal power loss, the first output of the primary winding of the low-frequency transformer is connected to the terminal of the first channel, and the second output is connected to the bus and through a capacitor connected to the inputs of the first and second loudspeaker heads of medium-high frequencies, the first output of the secondary winding of the low-frequency transformer is connected to the terminal of the second channel, and the second output is connected to the input of the low-frequency loudspeaker head, the output of which is connected to the common bus.