SU1278931A2 - Device for processing audio signals - Google Patents

Abstract

The invention relates to a technique for recording and transmitting audio information in systems with limited resolution. The purpose of the invention is to improve the sound quality of the signals processed before recording on the carrier. The audio signals supplied to the device are analyzed by analyzer 1 and converted into a set of modulating signals that are deformed in equalizer 2, which is configured to compress the frequency range of signals synthesized in synthesizer 3. Filters 4 and 5 avoid interference of signals during parasitic overlap of spectra caused by errors of demodulation and synthesis. Mixing the low frequencies ensures the correct identification of sounds, and the shifted spectral components that pass through the band-pass filter 5 provide the correct perception of their tonal colors. The invention is additional to the main. with. No. 714473. 1 Il. "

Description

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The invention relates to a technique for recording and transmitting audio information in systems with limited resolution and is an improvement of the device according to the authors. St. No. 714473.

The purpose of the invention is to improve the sound quality of signals processed before recording onto a medium with limited resolution or before transmitting on a communication channel with limited bandwidth.

Improving the quality is achieved by introducing an additional low-pass filter, bandpass filter and adder, so that the output of the adder is the output of the device for processing audio signals.

The drawing shows a block diagram of the proposed device.

The device contains an analyzer 1, a corrector 2, a synthesizer 3, a low-pass filter 4, a band-pass filter 5 and an adder 6. The inputs of this adder are connected to the outputs of the filters, the input of the band-pass filter connected to the input of the device through the serially connected analyzer 1, the corrector 2 and the synthesizer 3 .

The audio signals fed into the device are analyzed by analyzer 1 and converted into a set of modulating signals that are deformed in corrector 2, which is configured to compress the frequency range of the signals synthesized in synthesizer 3.

The introduced filters allow to avoid the interference of signals during spurious overlap of spectra caused by demodulation and synthesis errors. Such mixing of low frequencies that are not shifted by the transducers ensures the correct identification of sounds, and the shifted spectral components that have passed through a band-pass filter provide the correct perception of their timbre tones, and this results in an increase in the quality of sound signals from a limited band of frequencies.

The proposed device allows improving the quality of reproduction of phonograms recorded on a medium with limited resolution.

Claims (1)

Invention Formula A device for processing audio signals auth. St. No. 714473, characterized in that, in order to improve sound quality, a low-pass filter, a band-pass filter and an adder are added to it, the input of the low-pass filter input is connected to the input of the analyzer, and the input of the band-pass filter to the output of the synthesizer, and the outputs The entered filters are associated with the output of the device through the entered adder.