KR970058323A - 2-channel sound field controller - Google Patents

Abstract

The present invention relates to a two-channel sound field control device for reproducing a reflection sound signal such as an initial reflection sound and a rear reverberation sound of an audio signal with only two speakers on the bottom, while giving a feeling of virtually installing a speaker on the left and right sides of a listener. In particular, the initial reflection sound generation circuit generates four-channel initial reflection sound by the time delay and signal processing of the two channel stereo input signals L and R, and the four channel rear reverberation by the time delay and signal processing of the two channel stereo input signals L and R. 2 channel stereo direct sound output through a direct signal path after converting the rear reverberation sound generating circuit that generates sound and the generated 4 channel initial reflection sound and 4 channel rear reverberation sound into 2 channel sound effect which is a virtual side channel signal. And a channel conversion circuit that outputs the final two-channel signal by mixing with the It simplifies the hardware of the system and eliminates the need for additional speakers in addition to the amplifier and speaker playback systems required for playback. In addition, while obtaining the advantages in terms of cost and convenience as described above, the sense of space of various performance spaces in the home listening space can be reproduced in the same manner as in the four-channel system.

Description

2-channel sound field controller

Since this is an open matter, no full text was included.

3 is an overall block diagram of a two-channel sound field control apparatus according to the present invention;

4 is a detailed block diagram of the two-channel sound field controller of FIG. 3;

5 is a detailed block diagram of the two-channel down mixer of FIG. 4;

6 is a detailed block diagram of the virtual side channel synthesis section of FIG.

Claims (9)

Initial reflection sound generating means for generating 4-channel initial reflection sound by time-delaying and signal processing 2-channel stereo input signals L and R, and generating 4-channel rear reverberation sound by time-delaying and signal processing 2-channel stereo input signals L and R. After converting the rear reverberation sound generating means, the four-channel initial reflection sound generated by the initial reflection sound generating means and the four channel rear reverberation sound generated by the rear reverberation sound generating means into a two-channel effect sound which is a virtual side channel signal, and then a direct signal A two-channel sound field control device comprising channel conversion means for mixing with two-channel stereo direct sound output through a path and outputting the final two-channel signal. 2. The two-channel sound field control device according to claim 1, wherein the initial reflection sound generating means is configured in the form of a finite shock response filter in which the input data and the past values thereof are output in a linear combination. 2. The two-channel sound field control device according to claim 1, wherein the rear reverberation sound generating means is configured in the form of an infinite shock response filter indicating an output by linear combination of input data and past values of the output and past values of the output. . 2. The apparatus of claim 1, wherein the channel converting means comprises: a two-channel down mixer for converting the four-channel initial reflection sound and the four-channel reverberation sound signal output from the initial reflection sound generating means and the rear reverberation sound generating means into a two-channel effect sound signal; Virtual side channel synthesis that creates sound field effect by 4 speakers using only 2 speakers by creating an audio virtual speaker from the 2 channel effect sound signal converted by the 2 channel down mixer and the direct sound signal output through the direct signal path Two-channel sound field controller. 5. The apparatus of claim 4, wherein the two-channel down mixer comprises a first adder for adding a left channel signal ER _FL and ER _RL and outputting a left initial reflection sound ER _{L among} four channel initial reflection sound signals, and a right side of the four channel initial reflection sound signals. A second adder which adds the channel signals ER _FR and ER _RR to output the right initial reflection signal ER _R , and the left rear reverberation signal RV _L by adding the left channel signals RV _FL and RV _RL among the four channel late reverberation signals. A second adder for outputting a second adder, a fourth adder for outputting a right rear reverberation signal RV _R by adding a right channel signal RV _RL and RV _RR among four channel rear reverberation signals, and each of the first to fourth adders. The first and fourth adders are connected to the left and right two-channel initial reflection sound and the reverberation channel signal (ER _L , ER _R , RV _L , RV _R ) by multiplying the corresponding adjustment coefficients to adjust the magnitude thereof. 1 to 4 amplifiers, the first and third amplifiers Group the combined left early reflections and rear reverberation scaled sum of the left effects the fifth adder and the second, the fourth right side of the scale in the amplifier early reflections and rear reverberation for outputting (EF _L) in A two-channel sound field control device comprising a sixth adder for outputting a right effect sound (EF _R ). 5. The fifth and sixth amplifiers according to claim 4, wherein the virtual side channel synthesis unit multiplies the direct sound signals D _L and D _R by the same adjustment coefficient, and adjusts the magnitude, and the left effect sound output from the two channel down mixer. A first signal processor to attenuate and time delay the signal EF _L , a second signal processor to attenuate and time delay the right effect sound signal EF _R output from the two channel down mixer, and the two channel down mixer. A first subtractor for outputting a first sound effect signal by adding the left sound effect signal EF _L outputted from the negative signal and the right sound effect signal attenuated and time delayed by the second signal processing unit in reverse phase, and outputting the second channel down mixer part; right sound effect signal _(R EF) and said first combined signal from the processing unit and the decrease time-delayed left sound effect signal with opposite phases from the second subtracter and said fifth amplifier for outputting a second sound effect signal The seventh adder for group control a left direct sound by adding the first sound effect signal output from the signal of the first subtractor output as the final left speaker signal (X _L), and the sixth right with a scale in the amplifier direct sound signal And an eighth adder for adding the second effect sound signal output from the second subtractor and outputting the final right speaker signal) (X _L ). 7. The apparatus of claim 6, wherein the first signal processor multiplies the left effect sound signal by an adjustment factor to attenuate or amplify its amplitude, a delay delay for delaying the left effect sound signal adjusted by the amplifier by a predetermined time period, A two-channel sound field control device comprising a filter for filtering a left effect sound signal delayed by a predetermined time from a delay unit and adding it to the right channel in reverse phase. 7. The apparatus of claim 6, wherein the second signal processor multiplies the right sound effect signal by an adjustment factor to attenuate or amplify its amplitude, a delay delay for delaying the right sound effect signal adjusted by the amplifier for a predetermined time, A two-channel sound field control device comprising a filter for filtering a right effect sound signal delayed by a predetermined time by a delay and adding it to the left channel in reverse phase. The reproduction processing method according to claim 1, further comprising a switching means in front of the channel converting means to output a reproduction audio signal processed in two channels when two speakers are installed, and a reproduction processing in four channels when four speakers are installed. A two-channel sound field control device, characterized in that for outputting audio signals. ※ Note: The disclosure is based on the initial application.