RU191094U1 - UNIVERSAL POWER AMPLIFIER OF SOUND FREQUENCY - Google Patents

Abstract

The invention relates to a sound-amplifying technique, in particular, to power amplifiers of audio frequency signals made using monolithic, discrete or mixed technologies. In the first amplification channel, one loudspeaker is connected to the non-inverting output of the channel at the beginning of its voice coil, and to a common wire with the end, while the other loudspeaker is connected to the common wire with the end of its voice coil, and to the inverting output of the channel, in the second the amplification channel, one loudspeaker with the end of its voice coil is connected to the inverting output of the channel, and the beginning - to a common wire, while the other loudspeaker with the end of its voice coil through RC- enu is connected to the non-inverting output of the channel, and start - to ground. The technical result consists in improving the sound quality of a two-channel playback system in large rooms. 1 ill.

Description

Technical field

The invention relates to a sound-amplifying technique, in particular, to power amplifiers of audio frequency signals made using monolithic, discrete or mixed technologies.

The purpose of the utility model is to improve the sound quality of a two-channel playback system in large-volume rooms.

This goal is achieved by changing the connection diagram of the speakers to the outputs of the amplification channels, when the main speaker is in-phase connected to one of the outputs of each channel, and the additional speaker, which is located in the vicinity of the main speaker of the other channel in phase, is in-phase connected, thereby expanding the stereo effect area without reducing the power reproduction of signals by the main speakers, for which there is one speaker in the first amplification channel the beginning of its voice coil is connected to the non-inverting output of the channel, and the end to the common wire, while the other loudspeaker to the end of its voice coil is connected to the common wire, and the beginning by means of an RC circuit to the inverting output of the channel, in the second amplification channel, one loudspeaker with its end the voice coil is connected to the inverting output of the channel, and the beginning to the common wire, while the other loudspeaker is connected to the non-inverting output by the end of its voice coil through the RC circuit ala, but the beginning - to ground.

Description of analog

A device is known, which is a two-channel amplifier containing, at the output of each of the amplification channels, in addition to the main speaker connected in phase, an additional speaker connected to the channel output in phase through an RC circuit attenuating low frequencies [1, Fig. 1.8, p. 50]. The use of an additional loudspeaker in each channel increases the degree of separation of signals in a stereo playback system.

However, the known device has only one output in each of the amplification channels, and connecting to this output, in addition to the main additional speaker, reduces the power of the main signal reproduced by this channel.

Prototype description

It is known an amplifier device containing two identical amplification channels, a phase inverter is located at the input of each channel, the input of which forms the input of the amplification channel, the input of the first channel amplifier is connected to the non-inverting output of the phase inverter, and the input of the second channel amplifier identical to the first is connected to the inverting one, the output of the first the amplifier of each channel forms a non-inverting output of the amplification channel, and the output of the second amplifier forms an inverting output of the amplification channel, while the amplifier is loaded with four g loudspeakers, two of which form a pair and with the beginnings of their voice coils are connected to the combined non-inverting outputs of the channels, two other loudspeakers form another pair and the ends of their voice coils are connected to the combined inverting outputs of the channels, the other outputs of the coils in each pair of loudspeakers are connected one to the common wire, another - to the free output of the speaker from another pair [2].

The known prototype device has two outputs in each gain channel, the signals of which are out of phase with each other. The indicated option for connecting a load consisting of four loudspeakers is implemented by the Pseudo-Quadraphon decoder.

Prototype criticism

The reasons that impede the achievement of the required technical result when using the known device include the fact that the specified option for connecting four speakers to the outputs of the power amplifier has limited use, because implements the decoding procedure for complex signals supplied to the inputs of the amplifier.

Utility Model Essence

The problem to which the claimed utility model is directed is to improve the sound quality of a two-channel playback system in large-volume rooms.

This problem is solved by achieving, when implementing a useful model, a technical result, which consists in changing the connection scheme of the speakers to the outputs of the amplification channels, when the main speaker is in-phase connected to one of the outputs of each channel, and an additional speaker located in close proximity to the other output of the channel the main speaker of another channel, than the stereo effect zone is expanded without reducing the signal reproduction power fishing the main speakers.

The indicated technical result is achieved in that in the first amplification channel, one loudspeaker is connected to the non-inverting output of the channel by the beginning of its voice coil, and to the common wire with the end, while the other loudspeaker is connected to the common wire by the end of its voice coil, and to the inverting output of the channel, in the second amplification channel, one loudspeaker with the end of its voice coil is connected to the inverting output of the channel, and the beginning to the common wire, while another loud Oritel its voice coil end connected to the noninverting output channel by RC-circuits, and start - to ground.

The analysis of the prior art by the applicant, including a search by patent and scientific and technical sources of information, made it possible to establish that the applicant did not find an analogue characterized by features identical to all the essential features of the claimed utility model, and determining the prototype as the closest in the totality from the identified analogues features, allowed to determine the set of essential in relation to the technical result of the features in the claimed object, set forth in the formula of the utility model.

Therefore, the claimed utility model meets the requirement of "novelty."

List of drawings

The figure shows a structural diagram of an amplifier with a connected loudspeaker load that implements two-channel amplification when connected to the outputs of the channels of four loudspeakers. The following notation is used in the figure diagram: 1 — first amplification channel; 2 - input of the first amplification channel; 3 - phase inverter of the first amplification channel; 4 - the first amplifier of the first amplification channel; 5-second amplifier of the first amplification channel; 6 - non-inverting output of the first amplification channel; 7 - inverting output of the first amplification channel; 8 - the second channel of amplification; 9 - input of the second amplification channel; 10 - phase inverter of the second amplification channel; 11 - the first amplifier of the second amplification channel; 12 - the second amplifier of the second amplification channel; 13 - non-inverting output of the second amplification channel; 14 - inverting output of the second amplification channel; 15, 18 - non-polarized capacitors; 16, 17 - resistors selected by resistance.

The figure also presents four loudspeakers indicating the beginnings of the voice coils, and also indicates the common wire circuit of the entire amplifier.

Information confirming the feasibility of implementing a utility model

Information confirming the feasibility of implementing the utility model with obtaining the above technical result is as follows.

The figure shows the structure of the proposed device, which has versatility in relation to the connection of the load in the two-channel amplification mode. The amplifier contains two channels that are completely identical to each other: the first channel 1 and the second channel 8. Each channel has its own input (2 or 9), a phase inverter (3 or 10), a first channel amplifier (4 or 11), a second channel amplifier identical to the first (5 or 12) and two outputs: non-inverting output (6 or 13) and inverting (7 or 14).

In addition to the main amplifier, an additional loudspeaker is used as an amplifier load in each channel. So, in the first amplification channel (1), the main loudspeaker is connected at the beginning of its voice coil to the non-inverting output (6) of the channel, and its end is connected to a common wire, while the additional loudspeaker is connected at the beginning of its voice coil via an RC circuit (17, 18) to the inverting output (7) of the channel (1), and its end to the common wire. In the second amplification channel (8), the main loudspeaker is connected with the end of its voice coil to the inverting output (14) of the channel, and its beginning is connected to the common wire, while the additional loudspeaker is connected to the non-inverting end of its voice coil via an RC circuit (15, 16) the output (13) of the channel (8), and its beginning - to the common wire.

The presence of RC circuits (15-16 and 17-18), through which additional speakers are connected, is due to the need to eliminate low frequencies in the audio signal, otherwise their presence in the signal will overload the broadband speakers, which will lead to audible distortions even when average volume level. This is due to the fact that the voice coil of the additional loudspeaker is connected out of phase to the channel output. The elimination of low-frequency components is carried out using a first-order HPF with a frequency cutoff of about 90-180 Hz, the role of which is an RC circuit.

The capacitors (15 and 18) of the RC circuits must be unpolarized, due to the "unpredictability" of the polarity of the output signal of the amplifier, the output stage of which is made using a push-pull circuit, which in the vast majority of cases are each of the amplifiers of both channels. Capacitors should have a significant value, of the order of 50-220 microfarads. A non-polarized capacitor can be obtained by the opposite inclusion of two polarized capacitors, while the point of mutual connection of the capacitors should be connected to a common wire.

The resistance of the resistors (16 and 17) of the RC circuits should be selected within 4 ... 50 Ohms during the subjective adjustment of the sound quality of the system. With their help, it is necessary to adjust the sound volume of additional speakers so that at medium frequencies the best suppression of the signals of the opposite channels is achieved when listening to the main ones.

The specified speaker connection scheme assumes that the additional speaker of one channel will be spatially located relative to the main speaker of another channel at a distance greater than the distance between the main speakers by 30 ... 60 cm.

Such a mutual arrangement of the loudspeakers in spatial pairs, when one of the loudspeakers standing close to each other is in antiphase with respect to the signal of the other channel, will provide an increase in the degree of separation of the signals of adjacent channels, which expands the stereo effect area. At the same time, an additional loudspeaker connected to a separate output of the channel does not reduce the power of the signal reproduced by the main loudspeaker, which ensures high-quality sound reproduction of an audio program in a large-volume room.

Thus, the above information indicates the fulfillment of the following conditions when using the claimed utility model:

- a device embodying the claimed utility model in its implementation, is intended for use in power amplifiers of sound frequency signals made using monolithic, discrete or mixed technologies;

- for the claimed utility model in the form described in the utility model formula, the possibility of its implementation using the means and methods described above or known prior to the priority date is confirmed;

- a device embodying the claimed utility model in its implementation, is able to achieve the specified technical result.

Therefore, the claimed utility model meets the requirement of "industrial applicability" under applicable law.

Literature

1. Petrov A.A. Sound circuitry for ham radio / ed. CM. Yankovsky. - SPb .: Science and technology, 2003. - 400 p.: Ill. (Fig. 1.8, p. 50).

2. RF patent for utility model No. 164500 (RU 164500 U1). IPC HO3F 3/181 (2006.01). Application No. 2015151781/08, 02/02/2015. Published: 09/10/2016, Bull. No. 25 (prototype)

Claims (1)

A universal power amplifier of audio signals containing two identical amplification channels, there is a phase inverter at the input of each channel, the input of which forms the input of the amplification channel, the input of the first channel amplifier is connected to the non-inverting output of the phase inverter, and the input of the second channel amplifier identical to the first is connected to the inverting one moreover, the output of the first amplifier of each channel forms a non-inverting output of the amplification channel, and the output of the second amplifier forms an inverting output of the amplification channel, while The amplifier is loaded onto four loudspeakers, two of which form a pair and are connected to the combined non-inverting outputs of the channels by the beginnings of their voice coils, two other loudspeakers form another pair and by the ends of their sound coils are connected to the combined inverting outputs of the channels, one coil output in each pair of loudspeakers is connected to the common wire, the other to the free output of the loudspeaker from another pair, characterized in that in the first amplification channel one loudspeaker begins the vukovoy coil is connected to the non-inverting output of the channel, and the end to the common wire, while the other loudspeaker by the end of its voice coil is connected to the common wire, and the beginning through the RC circuit to the inverting output of the channel, in the second amplification channel one loudspeaker to the end of its voice coil it is connected to the inverting output of the channel, and the beginning to the common wire, while the other loudspeaker is connected to the non-inverting output of the channel by the end of its voice coil through the RC circuit, and the beginning - to the common wire.

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