SU1638799A1 - Method for wideband electric signal conversion - Google Patents

Abstract

The invention relates to radio electronics and can be used to convert a broadband electrical signal to an acoustic signal in electroacoustic devices. The goal is to increase efficiency and environmental safety. The essence of the invention is a method of converting a signal, preferably a wideband electrical with peak voltage Uw and power RM- on an RM load to an acoustic one, consisting in dividing a wideband electrical signal into several n signals along n frequency subbands, separately amplifying each the way of signals into acoustic, according to which when dividing a wideband signal into n signals, dividing the frequency range of a wideband signal into n frequency subbands The outcome is from the condition of an approximate equality of maximum peak voltages Um; x Um; and / or capacities of PT-tPn ,; The Pp of the signal to be converted in each of the subranges limits the indicated maximum peak values of the signals in accordance with the ratios g and pm -H and / or n ° S (L 1 kg, -V 2 Il.

Description

The invention relates to radio electronics and can be used to convert a broadband electrical signal to an acoustic signal in electroacoustic devices.

The purpose of the invention is to increase the efficiency and environmental safety ..

The method consists in converting a broadband electrical signal with peak voltages Uw and power Pw at a load of Hz into an acoustic one and consists in dividing the broadband electrical signal into several (n) signals along n frequency subbands, separately amplifying each of the n signals thus formed and Separate conversion of each of the n signals into an acoustic one, in which, when dividing a wideband signal into n signals, is the separation of the frequency range of wide-band OE СЈ 00

|

with so

signal on the p frequency subbands are made on the basis of the approximate equality of the maximum peak voltages

.n R. ... to P

 and / or capacities

" ...R

 No. ... c r t; e ... g m n the signal to be converted in each of the subbands, while limiting said maximum peak values of the signals in accordance with the ratios

Um n

and / or- Р

t.

 R, m p

Improving the environmental safety of the device for carrying out the proposed method is ensured by the fact that when converting a narrowband signal in any of the n sub-bands, the power Pm of the converted narrowband signal cannot

exceed values

um

P

, and total

the power of all n converted signals cannot exceed the values of PM n-Ј

  1L.

P2-P

In this case, a wideband signal is converted with maximum peak values U at the load R ,,. AT

w

hc And this is also one of the aspects of the efficiency of the proposed solution - hardware. In addition, the increase in efficiency is due to a decrease in power loss (in terms of power supply) as a result of the fact that, with the restrictions imposed on the maximum levels of narrow-band signals

Jl "

P

™;

-.Ј “

P"

The supply voltage of UnUT amplifiers can be reduced by about n times (from a level of about U 5 UM to a level

PETE

n about Unitr -I).

Fig. 1 is a functional diagram of one embodiment of an apparatus for carrying out the proposed method. The device contains a source of 1 wideband electrical signal, a block 2 for adjusting the signal level, frequency separation filters 3, 4 level signal controllers, 5 power amplifiers, converters

0

6 electrical signal in the acoustic.

FIG. Figure 2 shows a time diagram illustrating the addition of two sinusoidal signals of different frequencies, equal in amplitude and differing in frequency by 4-5 times, where signal 7 of low frequency f with amplitude or signal, signal 8 of higher volume Uni

five

five

frequency u

f "4f,

with am0

mi and total signal 9, amplitude U 11 „,, + and„ г.

The source 1 of the initial wideband electric signal is connected via the signal level adjustment unit 2 to the frequency separation filters 3, the outputs of the filters 3 are connected to the amplifiers 5 of power through the output level controllers 4 which are connected to the electroacoustic converter mi 6.

The device works as follows.

The original broadband electrical signal from source 1 through block 2 of the level control is supplied to frequency separation filters 3, by which the entire frequency range of the original signal is divided into several sub-bands, the cut-off frequencies of the filters are correlated so that the upper cut-off frequency of the frequency sub-band is the lower cut-off frequency of the next higher frequency subband. The 3-band electrical signals generated by the filters are fed through the 4-level controllers to the amplifiers 5. MORE THAN the latter, the signals are amplified to the required level, and then 5 acoustic signals are formed from them by the transducers b.

Amplifiers 5 provide amplification of all n signals in voltage and power, the maximum peak

0 values of the output voltage Search and the power P, each amplifier are limited, and they are chosen based on the conditional provision of the required maximum possible peak voltage Uw of the broadband electric signal, which is formed when the maximum voltage values of all n signals coincide:

five

0

-S-Uft; n-u

m

Thus, in the presence of the outputs of all n signal amplifiers of approximately one maximum level Uw- - the total

signal,., equivalent to an electrical broadband signal with a total maximum amplitude (at peak} n

ignal) U

/and

 U

go

nU

m,

The average power of the total signal is equal to the sum of the average powers n of the component signals P n-Pc.pi.

The maximum peak power of each of the n signals can not be greater than

2

t;

 TO

In and;

2

and ™; 2Ki;

corresponding to the maximum peak power of one channel amplifier, shaping the signal in the corresponding i-th subband. Consequently, in the device for implementing the proposed method, the maximum peak values U of the wideband electrical signal are converted while ensuring the average power of the converted signal, while the maximum output power

devices not

amplification signal

P

35

exaggerates

PC

g values

t,

 nR

t,

- P

U,

.- -RM II

Rm

those. at

RH RH p n times less than the maximum ikovogo power of the output signal single-channel

amplifier that provides the formation of a broadband electrical signal with a maximum amplitude

IV-ZUn; n-UM;

on the load RH, which increases the environmental safety of the device, for carrying out the proposed method.

Claims (2)

Invention Formula A method of converting a broadband electrical signal with peak voltage U at the load RH into an acoustic one, consisting of S dividing the wideband electrical signal into several (n) signals along n frequency subbands, separately amplifying each of these signals and separately converting each of the n signals into acoustic, characterized in that, in order to increase efficiency and environmental safety, the division of a broadband signal into n frequency subbands is based on reduced equality of maximum peak voltages in each frequency subband U t, about u p- 2. -u mn or power Рр, рт / у Pw of a wideband signal in each of the subbands, at that the specified maximum peak values of the n signals are chosen from the ratio iy P or Pm; ZM П2l} 4l} nZHiЈ i FIG. 2 Phie.1