RU167902U1 - High quality audio output device - Google Patents

Abstract

The invention relates to acoustics, in particular to audio equipment configured to reproduce sound from various audio sources. The device comprises a processor, a delta-sigma modulator, a signal averaging unit with an integrated signal filter, two operational amplifiers, a switching switch, a digital line input interface, an impedance converter, a digital audio signal offset compensation unit, and a voltage reference supply unit. In this case, the reference voltage supply unit is connected to the switching switch, the first operational amplifier and the digital line input interface are connected to the first input of the switching switch, and the second operational amplifier and the reference voltage supply unit are connected to the second input of the switching switch. The technical result is an increase in sound quality. 1 ill.

Description

FIELD OF TECHNOLOGY

The invention relates to audio equipment configured to reproduce sound from various audio sources. The claimed device can be widely used in the musical field, for example, concert activity, when recording an audio signal from several signal sources, for reproducing an audio signal.

BACKGROUND

A portable headphone amplifier device is disclosed in the prior art as described in US 2016100245 A1, publ. 04/07/2016, which connects to a portable device, such as a smartphone, and which converts the digital audio input signal from the portable device and produces a converted audio signal with high quality amplification. However, this device has an increased amount of noise both when playing digital audio signals, and when switching playback modes.

This device is selected as the closest equivalent.

DISCLOSURE OF A USEFUL MODEL

The technical task of the claimed utility model is to provide a device for processing and outputting an audio signal having the ability to output audio signals with the least amount of noise.

The technical result is to reduce the amount of noise when playing audio signals.

To achieve a technical result, the claimed device includes: a series-connected processor, a delta-sigma modulator, a signal averaging unit with an integrated signal filter; a first operational amplifier A1 and a second operational amplifier A2, connected in parallel to the signal averaging unit; a switching switch connected to the outputs of the first and second operational amplifiers and processor; digital line input interface connected to a communication switch; an impedance converter connected to the output of the switching switch, the output of which is the audio output of the device; a digital audio signal bias compensation unit connected to the signal averaging unit; moreover, the device further comprises a reference voltage supply unit, connections to a switching switch, wherein the first operational amplifier and the digital line input interface are connected to the first input of the switching switch, and the second operational amplifier and the reference voltage supply unit are connected to the second input of the switching switch.

These features are significant and are interconnected with the formation of a stable set of essential features sufficient to obtain the desired technical result.

The present utility model is illustrated by a specific example of execution, which, however, is not the only possible one, but clearly demonstrates the possibility of achieving the required technical result.

BRIEF DESCRIPTION OF THE DRAWINGS

In FIG. 1 is a general view of the claimed device.

IMPLEMENTATION OF A USEFUL MODEL

In particular, the claimed device shown in FIG. 1, comprises: a processor 1, a delta-sigma modulator 2, a signal averaging unit with an integrated signal filter 3; a first operational amplifier A1 and a second operational amplifier A2; switching switch 4; digital line input interface 5; impedance converter 6; a digital audio signal offset compensation unit 7 and a reference voltage supply unit 8.

When the claimed device is in the audio playback mode, the processor 1 outputs a digital audio signal to a delta-sigma modulator 2 and a signal averaging unit with an integrated signal filter 3, where the specified digital processing for the digital audio signal occurs. The processor 1 can read a digital audio signal from both internal and external memory (not shown in FIG. 1). The offset signal (offset value) of the digital format generated by the offset compensation unit of the digital audio signal 7 is supplied to the averaging unit of signal 3, thereby setting the offset value for the digital audio signal. This bias signal is generated to compensate for the voltage amplitude difference between the first operational amplifier A1, the second operational amplifier A2 and the voltage supplied by the reference voltage supply unit 8.

Next, the audio signal through the first A1 and second A2 operational amplifiers is fed to the first and second inputs of the switching switch 4, respectively. The reference voltage output from the reference voltage supply unit 8 is supplied to the second input of the switching switch 4. By simultaneously connecting the first A1 and second A2 operational amplifiers, voltage fluctuations are prevented. The digital line input interface is connected to the first input of the switch switch.

The switching switch 4, in accordance with the operating mode set by the processor 1, supplies either the voltage from the operational amplifiers or the reference voltage or the voltage supplied from the digital line input interface 5 to the impedance converter 6, after which the input voltage is converted and output as analog audio signal through audio output. The specified operation mode is selected from the following modes: reading a digital audio signal from the device’s memory, reading an audio signal from the digital line input interface 7, or a mute mode.

Thus, by generating a bias signal compensating for the voltage amplitude difference between the first operational amplifier A1, the second operational amplifier A2 and the reference voltage supply unit 8, as well as the proposed parallel connection circuit of operational amplifiers that prevent voltage fluctuations, it is reduced as the amount of noise in the output audio -signal, noise is also eliminated due to switching voltage sources by a switching switch.

The claimed device can be performed both in a stationary and in a mobile form and can be connected with a wide range of devices / equipment, in particular mobile phones, audio players, smartphones, tablets, musical instruments or other sources of audio signal.

Claims (9)

A device for outputting an audio signal, including a processor and an audio output, characterized in that it further comprises: a delta-sigma modulator connected in series with the processor; a signal averaging unit with an integrated signal filter connected to a delta-sigma modulator; a first operational amplifier A1 and a second operational amplifier A2, connected in parallel to the signal averaging unit; a switching switch connected to the outputs of the first and second amplifiers and processor; digital line input interface connected to a communication switch; an impedance converter connected to the output of the switching switch, and its output is the audio output of the device; a digital audio signal bias compensation unit connected to the signal averaging unit; moreover, the device further comprises a reference voltage supply unit, connections to a switching switch, wherein the first operational amplifier and the digital line input interface are connected to the first input of the switching switch, and the second operational amplifier and the reference voltage supply unit are connected to the second input of the switching switch.

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