GB2369278A

GB2369278A - A method of signal transmission for low frequency sounds

Info

Publication number: GB2369278A
Application number: GB0031775A
Authority: GB
Inventors: Eugueni Sergeyevich Alechine
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-12-27
Filing date: 2000-12-27
Publication date: 2002-05-22
Anticipated expiration: 2020-12-27
Also published as: GB2369278B; GB0031775D0

Abstract

The method ensures non-distorted transmission of electric signals of a periodic and non-periodic nature representing sounds having components in the range 20Hz-0Hz. As shown in fig.7, amplifiers 2-5 are connected with direct inter-cascade coupling to ensure the transmission of signals of a frequency Fc satisfying inequality 20Hz>Fc>0Hz. Direct current negative feedback independent of the amplitude and asymmetry of the initial electric signals may be provided.

Description

METHOD OF SOUND CHANNEL UPGRADING BACKGROUND OF THE INVENTION The invention concerns a method of signal transmission and can be used to transmit electric signals in the sound channel, but not exceptionally.

It is known a method to transmit and to receive low-frequency analog signals consisting in transmission to change a value of low-frequency analog signals, n dispatching which are transmitted, and for receiving it is necessary to make selections corresponding to n-dispatching of a changed value of low-frequency analog signals to summarize them with a weight factors as it recited in Copyright of the USSR, No 656161, H 03 K 9/02; H 04 B 15/00// ; 1997.

A drawback of this method is a low quality and a lack of the confidence in transmission of electric signals in the sound channel. It is connected with the real sound signals consisting not only periodic signals of a disharmonic nature in the range of the audible sound frequencies from 20Hz to 20kHz, but also the signals of a non-periodic nature which are in the range lower than 20Hz and may have spectrum from OHz or to satisfy inequality 20Hz > FsOHz, in which Fs is a frequency of a periodic disharmonic signal. The previous technical embodiment did not take into consideration that the origin of the natural sound vibrations are conditioned by the action of the positive or negative moment to an elastic material environment with the definite resonance properties.

Therefore, such influence of the constituent parts of a periodic and non-periodic nature is always connected to the presence of the constituent part of a periodic and non-periodic nature in the sound channel. The signals of a non-periodic nature correspond, par example, to the sounds of percussion instruments as shown in FIG. 1 having a continuous spectrum from OHz shown in FIG. 2. Such signals have also a considerable asymmetry as regards the horizontal reference axis shown in FIG. 3. It follows that in the sound signals there is the constituent constant part, an average sense of which for one operating time of the sound signal equates with the area difference over and under the horizontal axis as shown in FIG. 3. The real sound signals may to present as a simple sum of the symmetric disharmony signals shown in FIGS. 4 and 5, as a periodic sequence and signals of a nonperiodic sequence satisfying inequality 20Hz > Fs > OHz shown in FIG. 1. This definition is an important distinction from the accepted sense of a nature of the real sound signals and problems connected with the transmission of these signals in the sound channel devices.

Let us pay attention to the most rule: the periodic sound signals shown in FIGS. 5 and 4 generate discrete (interrupted) spectrums shown in FIG. 6 which blend free with to the field of the audible frequencies from 20Hz to 20kHz, and the non-periodic sound signals have a continuous (non-interrupted) spectrum in the range from OHz to 1/tu shown in FIG. 2., and perfectly do not blend with the sound frequency range established in accordance with the world standards, defining the high quality of the recording, reproduction and transmission of a sound information in the sound channel. For example: "Technical Performances of Sound Apparatus Hi-Fi according to the standard DIN 45500

[A5. 1, A5. 3j" described in edition Sound engineering-Guid ; Paul Skritek. Also in the most expanding American standard IHF-202A-78 is described in edition Audio power amplifiers desing; Baxandall P. J. Therefore, for the quality and confident method of the sound signal transmission and, more particularly, for the recording and reproducing of sound signals it is necessary to increase to a grate extend the range in the field of low frequencies practically to OHz. The proposed method of sound channel upgrading lets to take a sober the state of things in the field of audio more than for 100 years of the recording, reproducing and non-distorted transmission of electric signals in the electronic devices of the sound channel. There is a vast number of facts and publications proving the truth of an existence of the conceptual problem of a quality in the field of the recording, reproducing and transmission of sound signals in the sound channel. Having studied a prior art I tried to determine"non-obvious"of the proposed method. The results of this studying prove that the proposed method of sound channel upgrading corresponds to a criterion"non-obvious"of the present invention. For example, articles in such editions as: 1997 ;"Modern High-Quality Sound Frequency Power Amplifiers" ; S. N. Kreese, U. V. Chemykh.

1996 ;"Looking for Ideal" ; Salon Audio Video , 6 (10).

1997 ;"Acoustic Etudes" ; Salon Audio Videos, 29 (12).

1996 ;"Audiodelirium" ; Stereo & Videos, 7-8/111.

1997 ;"What appeals in this sound-LACK OF PURITY ?" ; "Jimmy Hues'Experiments" ;"Hi-Fi & MUSIC"1' (15).

2000 ;"Gate to the One-Cycle Paradise"; Salon Audio Videos, 10. 3.

1999 ;"Sound Channel of Twenty First Century and Sensational Exposure of Demagogy about Hi-Hi and High-End" ; Evgueni S. Alechine.

SUMMARY OF THE INVENTION An objet of the invention is to improve a quality and confidence of the transmission of electric signals through the sound channel.

An objet is obtained by one that well-known method-prototype transmits the electric signals, and the proposed method, besides, ensures non-distorted and confident transmission of electric signals of a periodic and non-periodic nature through the electronic devices of the sound channel with direct inter-cascade coupling, and the signal transmission with a frequency satisfying inequality 20Hz > Fs > OHz it is necessary to ensure by the forming of a signal with the direct current negative feedback which do not depend on the amplitude and asymmetry in the initial electric signals.

There are features in the proposed method, differing it in the prototype, namely: these features ensure non-distorted and confident transmission of electric signals a periodic and non-periodic nature through the electronic devices of the sound channel with direct intercascade coupling, and the signal transmission with a frequency satisfying inequality 20Hz > Fs > OHz they ensure by the forming of a signal of the direct current negative

feedback which signal does not depend on the amplitude and asymmetry in the initial electric signals and just these features limit an accordance of the preferred technical embodiment to a criterion"novelty".

For testing the preferred technical embodiment as regards a criterion"essential distinctions"had been compared its distinguishing features with the features of wellknown technical embodiments which showed that a sum total of such features as"... these features ensure non-distorted and confident transmission of electric signals of a periodic and non-periodic nature through the electronic devices of the sound channel with direct inter-cascade coupling, and the signal transmission with a frequency satisfying inequality 20Hz > Fs > OHz they ensure by the forming of a signal of the direct current negative feedback which signal does not depend on the amplitude and asymmetry in the initial electric signals"are lack in well-known technical embodiments, and that lets to draw a conclusion about an accordance of the preferred technical embodiment to a criterion"essential distinctions".

An accordance of the preferred technical embodiment to a criterion"positive effect" is limited by one that in a method-prototype in addition it is necessary to ensure nondistorted and confident transmission of electric signals a periodic and non-periodic nature through the electronic devices of the sound channel with direct inter-cascade coupling, and the signal transmission with a frequency satisfying inequality 20Hz > Fs > OHz they ensure by the forming of a signal of the direct current negative feedback which signal does not depend on the amplitude and asymmetry in the initial electric signals. Just this sum total of distinguishing features used in the proposed method lets to upgrade the quality and confidence of the electric signal transmission through the sound channel that give the right to draw a conclusion about an accordance of the preferred technical embodiment to a criterion"positive effect".

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a graph showing non-periodic signal with the pulse duration more than 0 generating the ending wise signal spectrum.

FIG. 2 is a graph showing a signal spectrum shown in FIG. 1.

FIG. 3 is a graph showing an asymmetric signal regard to the axis of time being a simple sum of a periodic disharmonie sound frequency signal in the range of 20Hz20kHz and a signal of the infrasonic constituent with a periodic nature of disharmonic form.

FIG. 4 is a graph showing a disharmonic periodic signal symmetric regard to the axis of time.

FIG. 5 is a graph showing a disharmonic periodic signal symmetric regard to the horizontal axis of time.

FIG. 6 is a graph showing a discrete (line) signal spectrum shown in FIG. 5.

FIG. 7 is a block diagram of a device of the precise graduated attenuator with the digital controls for practice embodiment of a method according to claim 1.

FIG. 8 is a block diagram of a device for practice embodiment of a method according to claim 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 7 Is a structural schematic representation of the precision graduated attenuator with the digital controls with the help of which it is possible to realize the proposed method according to claim I as recited in Operating Amplifiers; Moscow; 1993.

The proposed device 1 consists of four series connected operating amplifiers 2-5 with direct inter-cascade coupling.

A method according to claim 1 is realized as following: it is necessary to transmit electric signals of a periodic and non-periodic nature from input to output of using device 1 through the series connected operating amplifiers 2-5 with direct inter-cascade coupling that lets to ensure non-distorted and confident transmission of electric signals of a periodic and non-periodic nature by using of devices 2-5 with direct inter-cascade coupling.

FIG. 8 is a structural schematic representation of a device for realization of a method according to claim 2.

The proposed device 1 consists of an amplifier 2 and a former 3 having a comparator 4, a limiter 5 and an integrator 6.

A method according to claim 2 is realized as followings : it is necessary to transmit electric signals from input to output of using device 1 through an amplifier 2 with direct inter-cascade coupling. From the output signal of an amplifier 2 it is necessary to form a signal of the direct current negative feedback which signal does not depend on the amplitude and asymmetry of the initial electric signals for transmission of them with an amplifier 2 satisfying inequality 20Hz > Fs > OHz. The non-distorted transmission of these signals effects with a former 3 by the amplification of signals with a comparator 4, with the limiting on the amplitude with a limiter 5 and by the transformation of a received signal differing in length into a signal differing in amplitude with the help of an integrator 6. It is necessary to transmit a signal from output of an integrator 6 to noninverter input of an amplifier 2.

The proposed method of sound channel upgrading in comparison with prototype by the leading of new operations into it, namely: the electric signal transmission through the sound channel when it is possible to realize through the electronic devices of the sound channel with direct inter-cascade coupling, and the transmission of signals by a frequency satisfying inequality 20Hz > Fs > OHz it is possible to ensure by the forming of a signal of the direct current negative feedback which signal does not depend on the amplitude and asymmetry of the initial electric signals, and this method lets to upgrade a quality of the operation sound channel by the ensuring non-distorted and confident transmission through the sound channel of electric signals.

Claims

What is claimed is : 1. A method of sound channel upgrading consisting in transmission of electric signals differing in that with the help of this method it is possible to ensure non-distorted and confident transmission of electric signals of a periodic and non-periodic nature through the electronic devices of the sound channel with direct inter-cascade coupling.
2. A method according to claim 1, characterised in that said transmission of signals on the frequency satisfying the inequality 20Hz > Fs > OHz it is necessary to ensure by forming a signal with the direct current negative feedback, a signal of which does not depend on the amplitude and asymmetry of initial electric signals.

2. A method according to claim 1 differing in that the transmission of signals on a frequency satisfying inequality 20Hz > Fs > OHz it is necessary to ensure by the forming of a signal with the direct current negative feedback, which signal does not depend the amplitude and asymmetry of the initial electric signals.

Amendments to the claims have been filed as follows 1. A method for sound channel upgrading consisting in transmission of electric signals, characterised in that with the help of this method it is possible to ensure non-distorted and authentic transmission of electric signals of a periodic and nonperiodic nature through the electronic devices of the sound channel with direct interstage coupling.