Signal processing device, signal processing method, and speaker device

Patent metadata

Field	Value
Publication number	US-2019132677-A1
Application number	US-201816171488-A
Country	US
Kind code	A1
Filing date	Oct 26, 2018
Priority date	Oct 27, 2017
Publication date	May 2, 2019
Grant date	—

Abstract

A signal processing device configured to perform: low pass filter processing to extract a low frequency component of an audio signal, compression processing to compress the audio signal to which the low pass filter processing is performed in a case that the audio signal to which the low pass filter processing is performed is not less than a predetermined signal level, high pass filter processing to extract high frequency component of the audio signal, first volume processing to attenuate the audio signal, and synthesis processing to synthesize the low frequency component of the audio signal to which the compression processing is performed and high frequency component of the audio signal.

First claim

1 . A signal processing device configured to perform:
low pass filter processing to extract a low frequency component of an audio signal, compression processing to compress the audio signal to which the low pass filter processing is performed in a case that the audio signal to which the low pass filter processing is performed is not less than a predetermined signal level, high pass filter processing to extract high frequency component of the audio signal, first volume processing to attenuate the audio signal, and synthesis processing to synthesize the low frequency component of the audio signal to which the compression processing is performed and high frequency component of the audio signal.

2 . The signal processing device according to claim 1 ,
wherein, in the first volume processing, the audio signal is attenuated based on a volume value that is received.

3 . The signal processing device according to claim 1 ,
wherein, the first volume processing is performed to the audio signal to which the low pass filter processing is performed and the audio signal to which the high pass filter processing is performed.

4 . The signal processing device according to claim 1 ,
wherein, the low pass filter processing and the high pass filter processing are performed to the audio signal to which the first volume processing is performed.

5 . The signal processing device according to claim 1 , further configured to perform:
monaural synthesis processing to synthesize an audio signal that a left audio signal is multiplied by 0.5 and an audio signal that a right audio signal is multiplied by 0.5, and band pass filter processing to extract a predetermined frequency band component between the low frequency component and the high frequency component of the audio signal to which the monaural synthesis processing is performed, wherein, in the low pass filter processing, the low frequency component of the audio signal to which the monaural synthesis processing is performed is extracted, in the compression processing, the audio signal to which the low pass filter processing is performed is compressed when the audio signal to which the low pass filter processing is not less than the predetermined signal level, in the high pass filter processing, the high frequency component of the left and right audio signals is extracted, in the first volume processing, the left and right audio signals are attenuated, and in the synthesis processing, the low frequency component of the audio signal to which the compression processing is performed and a predetermined frequency band component of the audio signal are synthesized.

6 . The signal processing device according to claim 5 ,
wherein, the first volume processing is performed to the audio signal to which the low pass filter processing is performed, the audio signal to which the band pass filter processing is performed, and the audio signal to which the high pass filter processing is performed.

7 . The signal processing device according to claim 5 ,
wherein, the high pass filter and the monaural synthesis processing are performed to the audio signal to which the first volume processing is performed.

8 . The signal processing device according to claim 1 , further configured to perform:
band pass filter processing to extract a predetermined frequency band component between the low frequency component and the high frequency component of the left and right audio signals, and monaural synthesis processing to synthesize the audio signal that a left audio signal is multiplied by 0.5 and the audio signal that a right audio signal is multiplied by 0.5, wherein, in the low pass filter processing, the low frequency component of the audio signal to which the monaural synthesis processing is performed is extracted, in the compression processing, the audio signal to which the low pass filter processing is performed when the audio signal to which the low pass filter processing is not less than the predetermined signal level is compressed, in the high pass filter processing, the high frequency component of the left and right audio signals is extracted, in the first volume processing, the left and right audio signals are attenuated, and in the synthesis processing, the low frequency component of the audio signal to which the compression processing is performed and the predetermined frequency band component of the left audio signal are synthesized and the low frequency component of the audio signal to which the compression processing is performed and the predetermined frequency band component of the right audio signal are synthesized.

9 . The signal processing device according to claim 8 ,
wherein, the first volume processing is performed to the audio signal to which the low pass filter processing is performed, the audio signal to which the band pass filter processing is performed, and the audio signal to which the high pass filter processing is performed.

10 . The signal processing device according to claim 8 ,
wherein, the high pass filter processing, the band pass filter processing, and the monaural synthesis processing are performed to the audio signal to which the first volume processing is performed.

11 . The signal processing device according to claim 1 , further configured to perform
band pass filter processing to extract a predetermined frequency band component between the low frequency component and the high frequency component of the audio signal that a left audio signal is multiplied by 0.5 and extract a predetermined frequency band component of the audio signal that a right audio signal is multiplied by −0.5, monaural synthesis processing to synthesis the audio signal that the left audio signal is multiplied by 0.5 and the audio signal that the right audio signal is multiplied by 0.5, and delay processing to delay the left and right audio signals to which the band pass filter processing is performed, wherein, in the low pass filter processing, the low frequency component the audio signal to which the monaural synthesis processing is performed is extracted, in the compression processing, the audio signal to which the low pass filter processing is performed when the audio signal to which the low pass filter processing is performed is not less than a predetermined signal level is compressed, in the high pass filter processing, the high frequency component of the left and right audio signal is extracted, in the first volume processing, the left and right audio signals are attenuated, and in the synthesis processing, the low frequency component of the audio signal to which the compression processing is performed and the predetermined frequency band component of the left and right audio signals to which the delay processing is performed are synthesized.

12 . The signal processing device according to claim 11 ,
wherein, the first volume processing is performed to the audio signal to which the low pass filter processing is performed, the audio signal to which the band pass filter processing is performed, and the audio signal to which the high pass filter processing is performed.

13 . The signal processing device according to claim 11 ,
wherein, the high pass filter processing, the band pass filter processing, and the monaural synthesis processing are performed to the audio signal to which the first volume processing is performed.

14 . The signal processing device according to claim 5 ,
wherein, the high frequency component of the left and right audio signals is output to tweeters respectively, and the audio signal to which the synthesis processing is performed is output t

Assignees

• Onkyo Kk

Inventors

• Kurosaki Hiroki
• Kawaguchi Tsuyoshi
• Nakanishi Yoshinori
• Kitagawa Norimasa

Classifications

• H04R2430/01

  Aspects of volume control, not necessarily automatic, in sound systems · CPC title

• H04R3/04 Primary

  for correcting frequency response · CPC title

• H04R3/007 Primary

  Protection circuits for transducers · CPC title

• H04R3/14

  Cross-over networks · CPC title

• H04S2400/03

  Aspects of down-mixing multi-channel audio to configurations with lower numbers of playback channels, e.g. 7.1 -> 5.1 (H04S2400/01 takes precedence) · CPC title