Acoustic processing device and acoustic output device

A processing device and audio technology, applied in signal processing, frequency/direction characteristic device, transducer circuit, etc., can solve the problem of no audio terminal with ultrasonic signal, and achieve the effect of not damaging the design

Active Publication Date: 2020-03-06
SOCIONEXT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, conventional TVs do not have an audio terminal capable of outputting ultrasonic signals, so not only audio terminals for connecting earphones or external speakers are required, but also a new dedicated audio terminal for outputting ultrasonic signals is required.

Method used

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  • Acoustic processing device and acoustic output device
  • Acoustic processing device and acoustic output device
  • Acoustic processing device and acoustic output device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0031] figure 1 It is a block diagram showing a configuration example of the audio processing device 10 according to the first embodiment.

[0032] The sound processing device 10 is a signal processing device that processes sound signals to output sound signals in the audible frequency range and ultrasonic signals including the sound signals, and includes an oversampling unit 11 , a modulation unit 12 , an adder 13 , and an sound output terminal 14 . In addition, in this figure, as types of speakers connected to the audio output terminal 14 , a speaker 20 for an audible frequency range, a headphone 21 , and an ultrasonic speaker 22 are shown. In addition, an "acoustic signal" is a signal broadly including all sounds, such as a musical instrument, not only a voice.

[0033] The input audio signal is a digital signal having a sampling frequency of Fs including frequency components below Fh when a preset frequency is Fh (hereinafter, Fh is also referred to as "upper limit freque...

Deformed example 1

[0059] Next, an acoustic processing device according to Modification 1 of Embodiment 1 will be described.

[0060] Figure 9 It is a block diagram showing a configuration example of an acoustic processing device 10 a according to Modification 1 of Embodiment 1. FIG. This acoustic processing device 10a differs from the acoustic processing device 10 according to Embodiment 1 in that the modulation unit 12 is replaced with a new modulation unit 12a.

[0061] The modulator 12a uses not the sound signal input to the sound processing device 10a but the output signal from the oversampling part 11, and modulates the ultrasonic signal as a carrier wave. In Embodiment 1, in order to generate Figure 5 (a) shows a signal whose sampling frequency Fs is 192 kHz, and quadruple oversampling is performed on the sound signal input to the sound processing device 10 a. In this modified example, the modulation unit 12 a uses the output signal from the oversampling unit 11 as an input signal, t...

Deformed example 2

[0064] Next, an acoustic processing device according to Modification 2 of Embodiment 1 will be described.

[0065] Figure 10It is a block diagram showing a configuration example of an acoustic processing device 10b according to Modification 2 of Embodiment 1. FIG. This sound processing device 10b is different from the sound processing device 10 according to Embodiment 1 in that the sound signals input to the oversampling unit 11 and the modulating unit 12 are divided into different sound signals (respectively, the first sound signal and a second audio signal).

[0066] In other words, the oversampling unit 11 oversamples the first sound signal to a signal having a sampling frequency equal to or greater than 2×Fs. The modulation unit 12 modulates the second sound signal and an ultrasonic signal with a frequency Fc equal to or greater than 2×Fh as a carrier.

[0067] Here, the first sound signal is, for example, the main sound signal (main sound) of a TV broadcast, while the...

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Abstract

This acoustic processing device (10) is provided with: an oversampling unit (11) which includes frequency components of Fh or lower when a preset frequency is taken as Fh, and oversamples an acousticsignal, which is a digital signal having a sampling frequency Fs, to a sampled frequency signal 2*Fs or higher; a modulation unit (12) which modulates, as a carrier, an ultrasonic signal having the frequency Fc equal to or greater than 2*Fh by using the acoustic signal; an acoustic output terminal (14); and an adder (13) which adds an output signal from the oversampling unit (11) to an output signal from the modulation unit (12) to output the added signal to the acoustic output terminal (14).

Description

technical field [0001] The present invention relates to a sound processing device for processing sound signals and a sound output device for outputting sound. Background technique [0002] In recent years, television receivers (hereinafter referred to as "television") tend to focus on thinner and more design-oriented frame designs. In most cases, the speakers are set to face downward to emit sound to the bottom of the television panel. In this case, the sound emitted downward from the speaker is reflected and diffused on the upper surface of the cabinet where the TV is placed, and has no directivity. [0003] On the other hand, there have been conventionally proposed techniques for reproducing sound with high directivity using an ultrasonic speaker. This technology uses the signal in the audible frequency domain to modulate the ultrasonic signal as the carrier, so that the generated sideband waves and the sound wave fluctuations caused by the carrier can be heard. Combined ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00
CPCH04R1/26H04R2217/03H04R2420/01H04R2499/15H04R1/227H04R2430/20
Inventor 宫阪修二
Owner SOCIONEXT INC
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