RU5308U1 - THREE-PROGRAM RECEIVER WITH SMALL EXTERNAL VARIABLE MAGNETIC FIELD - Google Patents

Abstract

A three-program receiver with a small external variable magnetic field, comprising a series-connected input device, a frequency selective device, a program selector, a detector, a power amplifier and an acoustic emitter, as well as a power supply unit, characterized in that the input device is made on differential amplifiers, frequency selective the device is made in the form of active RC bandpass filters, the power amplifier is made paraphase, and the acoustic emitter is made of two-channel from opposite to a systematic way of alternating magnetic fields 2N pairs of identical electrodynamic speaker.

Description

THREE PROGRAM RECEIVER WITH SMALL EXTERNAL VARIABLE

MAGNETIC FIELD

A useful prayer belongs to the field of radio hanging, in particular - to three-way receivers, and is intended for use in cases where it is required to provide small ./long variable fields, capricer, dl. ensuring. electromagnetic compatibility of the receiver with other radio equipment and the electromagnetic safety of listeners L1).

It is known that the traction system (hanging) is a system in which the signals of the sound (first) program and several high-frequency non-dry signals modulated by the signals of other (second, third) sound programs are transmitted via the radio transmission network (RTS).

Structural schematic of a three-program receiver, connected with RTS, contains (speed rms. 1) input device 21 whose input is connected to input 1 RTS | sensitivity regulators of three -: reception analogs installed at the output of the input device. st1 a 2 i frequency-selective device 3 installed at the output of the sensitivity regulators of the view channels; detector 4. connected to the output of the frequency-picking device 3 through the selector 5 of the obtium programs -t-- volume selector P4, -closed at the output of the selector 5; 3 amplifier 6 fraud 3:; frequency frequencies at the output of the volume control: bone P4; acoustic emitter 7 at the output of the amplifier - ksnosti-In addition, the receiver has a short / short circuit of lithium amplifying - converting elements, states from the rectifier 8, connected to the input of the mains .10 through a silo transformer 9

The receiver operates as follows: after pz, to 1 and 10 of the mains input device 2 divides: the n-hollow signal into the high-frequency and low-frequency parts, the regulator senses / unnm high-frequency channels P2 and RZ set the level of these channels, and the Pi regulator sets the level of the low-frequency channel From the on-off knobs of the controllers, the signals of the high-frequency channels are fed to the GCSD of the frequency-selective device 3, splitting 1U; they are fed to; second and third channels, which, through the selector 5, go to the 5-way detector 4, is converted in audio-frequency signals.

mii6 H04B 1 / 10.1 / 16, H04H 1/04.

tpaKTOH three-way receiver). From the output of the selector 5 Selected program through the general volume control P4 and amplifier 6 and the frequency of sound frequencies goes to the acoustic emitter 7. Switching to another program is done simply by switching the selector of 5 programs.

It is also known that the operation of a three-program receiver (along with the emission of zeuk oscillations) is accompanied by the formation of Enetin variable magnetic poles created by the traction forcing device 2 of the inductance coil of the filters of the frequency-selective device 3, the magnetic system of the head of the electrodynamic loudspeaker of the acoustic transmitter 7 and power transformer 9.

The indicated external alternating magnetic fields can inflict damage on the health of listeners and induce unwanted interference in the circuits of other radio devices sensitive to the influence of extraneous alternating magnetic fields (L1). It is also very important that these external transfused magnetic fields can cause unwanted information leakage Ai).

In connection with this, it becomes necessary to eliminate, or at least, weaken the external variable magnetic fields to the PGD level.

(In order to reduce external magnetic fields, a set of measures is usually used; use of low-emitting circuits; shielding of g-elements of circuits; scrolling; general shielding of devices, etc. However, the fame of general methods has not yet led to the creation of receivers, there are actually quite small Bkeke alternating magnetic fields.

Manufactured by industry) at present, three-program chambers: tenders (L2) are constructed according to the same structural scheme described above - Fig-1. It should be noted that.

-Input device 2 By /.

- ChE. Frequency-selective device 3 mains.-Ns ka with r unnli of circuits with katu akalk inductance

- acoustic emitter 7 single-channel and as: the rule consists of one electrodynamic loudspeaker

- the input of the rectifier 8 is connected to the input 10 of the mains through a step-down transFORVATSR 9.

In this scheme, the formation of external variable magnetic fields. occurs due to the above KCTOMHKKC-L emit transformer input Gotrokstgs 2 Katuyuki .-; 4jKTr - ;; 5 icc Jt circuits frequency -. . : elgkt ro1 (-gnitgsgs: loudspeaker a.kus; tticheskogo; -: - splitter 7 j ponkazhayu:} h; th syalsy

For ukenshekin extra-variable magnetic fields, elements and nodes having external external fields are used in them only. In part, power transformers perform Hf closed-up ::. of lecto-core cores (A3) to carcasses of contours

- Special design 1-g.

 of these cores is necessary to further reduce the external ole-) tskra.m.mi-logic of all of the above radiation with radiation. to this run; to peiijesT problems completely, magnetic radiation penetrates (to a varying degree).

Beginning of the direct Ross Rosslenkost "and having a reduced in -: -" opinion on the known previrklatku priekkikoz (L2) level sHewHMx re-infused magnetic fields

It contains an input device 2 connected to the input 1 of the PTC yt made on transformers "output. which is connected to the frequency-selective device 3 of the content j, C multi-circuit system on the inductors. The output of the device 3 through the selector 4 is connected to the input of the detector 5h and the output of which is installed the general volume control P4t.; through a power amplifier 6 s acoustic .3 / 1HF: telen 7 is made to the same electrodynamic unit gOKkog.oBoritels- Sprayer input to the sagdglnyan with 10 e / ectros input through a lowering transformer E made on a toroidal core and the output is connected to constant current circuits At the same time, the transformers of the input device 2 к kyguolsy inductance of the frequency-selective device 3 ро speaker of the acoustic system 7 and lowering the power-axis oriator less s in their own ekranyOpisanny above receiver sybran us as prototipaZneshnee alternating magnetic field mensheichem prototypes have ost famous cap trehpk ogrammnyh gromkogovoiteley but for a number of important applications of it all - still more acceptable. It is possible to reduce this field by “shielding the receiver as a whole several times and even shielding the room in which the receiver is installed. This slitiks is expensive and not very reliable, because during operation the quality of the shielding can change unauthorized for example, if the characteristics of the shielding materials change, the formation of teli in the screens, etc.

 The objective of this utility model is to further; 7, the decrease in the external perpendicular magnetic field of a three-program receiver, and relatively simple. reliable means.

This problem is solved by the fact that in the well-known three-program receiver with a small external variable magnetic field:; a serially connected input device frequency-selective device detector} power amplifier and acoustic-radiator frequency-selective input of the device ;, the device is connected to the input of the radio channel through the input device program selector detector volume control and power amplifier connected to the input of the acoustic emitter) the rectifier input is connected to the input power supply through a step-down traioFormator and output ovdiken.v on receiver current circuits,

Significant changes and additions have been made, namely:

Exit-Exit device at d 75 gentsig.lny: x. pzrgg ;. vct./.MTS/R :: (L)

- otot-o is irgt5. Ustrsystgs nt half-en on -gu.tiE1a-1: with .trzkh L5 /,

-us 1: pour. “Oakostm executed pair i

The essence of the claimed utility model is illustrated in Fig. 1 h, where the strt is shown. Scheme of the claimed utility model. The following notation is used in the figure: 1- input of a broadcasting network 2-input device on differential amplifiers 3-frequency-selective device on band-pass active PC filters, 4 - detector 5-program selector, 6 para-phase audio power amplifier, 7 two-channel acoustic emitter with opposite the orientation of the moments of external variable fields of identical emitters, 8 - a rectifier, 9-step-down transformer, 10 - input of the power supply network, Р15Р2 РЗ - channel sensitivity controls, P4 - general regulator bones.

The receiver operates as follows - After connecting the receiver to the three-program RTS and the mains, three-program hanging signals are received at its input, and the voltage is supplied to the amplifier transformer — The listener selects the desired program — For example, when you select -: the high-quality channel of the second program, the following occurs. The signal of the second program through the corresponding differential differential amplifier input device 2 (DU2). sensitivity regulator P2 and active PC band-pass Filter of a frequency-selective device 3 with the aid of a selector 5 programs enters the detector 4 is detected and already in the form of a low-frequency backlight: through the same selector 5 programs enters the general volume control P4. The listener with the help of sensitivity regulators P2 and volume F4 sets its level at the input of the two-phase power amplifier 6, at which the speaker system 7 reproduces it without distortion and with the volume selected by the listener. riemnike kotochkkh iedgly kahodyashyahsya Yod current ikformatsionnh O5 :: persecuted. as well as acoustic C1 system 7, which was compensated for by the resulting magnetic moment, allowed us to obtain a useful model with an alternating magnetic field much smaller than that of the prototype. Moreover, in this way you can get the value of the external variable magnetic OLA less than a predetermined value. This is achieved soero only by complicating the speaker system 7, in which the number of pairs of electrodynamic speakers (L6) is increased to reduce the external variable magnetic field. The achievement of the task (reduction of external variable magnetic fields) occurs as follows. The strongest radiation sources in the receiver (input device and frequency selective device) in the proposed utility model practically do not radiate, since they do not contain elements that form an alternating magnetic field - they are built on non-inductive elements - active PC elements and operational amplifiers. The other very moisy source of the overeaten magnetic field — the magnetic system of the walker-speaker — is also significantly weakened in the proposed utility model, since its external variable magnetic field is compensated by almost the same size but opposite direction of the fields of the second s of this pair of loudspeakers introduced into the speaker system in accordance with Kommersant recommendation (L6).

3 radio engineering, and also uses the utility model of the speaker system mastered by the industry (Л6)

Thus, the claimed utility model meets all the criteria pre-declared for utility models. sleep is new and industrially applicable

Reference literature

1, B.A. Samoilov.zh.Tehnika youth, N .1-1996, p. 382-Yu.P-ylekseev. Household receiving and amplifying radio equipment

Handbook. Radio Communication. M-1987, section 6, pp. 346-400. 3 Three-program receiver Siren-1, specifications

ICZ.843.788 TU. 4.V.S. Gutnikoz. Integrated electronics with measuring

devices.Energoatomizda TL.1983, section 1.4, Z.V. Saraga D. Hague R. Barker. Design principles

Microelectronic PC Filters. TIIER, vol. 67, N1.1979. 6. VK.Zheleznyak. Acoustic system with a small external magnetic

Useful model 95132252/20 from 22-12-95, there is a solution

certificate issuance

Claims (1)

A three-program receiver with a small external variable magnetic field, comprising a series-connected input device, a frequency selective device, a program selector, a detector, a power amplifier and an acoustic emitter, as well as a power supply unit, characterized in that the input device is made on differential amplifiers, frequency selective the device is made in the form of active RC bandpass filters, the power amplifier is made paraphase, and the acoustic emitter is made of two-channel from opposite to a systematic way of alternating magnetic fields 2N pairs of identical electrodynamic speaker.