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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of
the SQ decoder of the present invention, FIG. 2 is a circuit connection diagram showing one
embodiment of the phase shifter according to the present invention, FIG. b and c explain the
function of phase shift. In the figure, D and a are simplified circuit diagrams, b is a vector
diagram, and C is a phase characteristic curve diagram. ? N21 ... Lj input end, work N2. ..... Rj
input terminal,. 21, 22, 23, 24 и и и и и и и и и и и и и и и и и и и и и и и и и и mixing phase L25, 26 и и и и и и Phase
shifter, TR2 ? E и и и и и и и и и и и и и и и и и и и и и и и и и и и и и mixing circuit, OUT21 ' и и и и и Lf 'output, OUT22
ииииии Lb' output, OUT2g иииии Rb 'output, OUT24 ииииии Rf' output. LTF, LvO. 707 LB ["stop one RTO,
70'7 LBRFCIRT Fig. 1 21-actual opening 49-36908 (2)? Fig. 2 [al [b] f: Number of rivers [C]?
Kawai-I Works 22-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an 8Q 4-channel
stereo reproduction apparatus Ii, and more particularly to a simplified 8Q decoder. In 49-3690802, the decoder of the conventional 8Q (8TERBOQUAD abbreviation) system 4-channel stereo
playback device, both right and left C signals are separated by 90 ░ right and left across almost
the entire audio frequency range. It was configured to have a phase difference. That is, this is
because it was required to improve the sound image localization of each component, and this
complicates the construction of the device. On the other hand, in apparatuses for widespread use
and the like, there has been a demand for a simplified type SQ decoder which can simplify the
configuration of the apparatus and perform C as good as possible in terms of sound image
localization. The present invention has been made to look at the above points ? ? knees, and
provides good phase characteristics by the constituent parts jJ and r, and in particular provides a
simplified SQ decoder in the 4-channel stereo reproduction apparatus of the SQ system. The
purpose is Hereinafter, an embodiment of the present invention will be described in detail with
reference to the drawings. That is, in Fig. 1, INtI and INu are 4 channels left, right, left, and right,
respectively, from an encoder (not shown), $ "-y-7" yf "" '"" Par: 1. , 949-36908-03C), of which
the input end INn of LT is connected to the first mixing circuit 21 to give a mixing amount of +10
and is connected to the second mixing circuit 22 to mix +0.2 Give the amount, and the eighth.
The fourth mixing circuit 23.24 is connected to +1.0. Give a mixing amount of -0.4. On the other
hand, the input terminal IN of BT is connected to the mixing circuit 22I of 1 Ji 2 to provide a
mixing amount of +1.0, and the first 1. Eighth. @ 4 mixing circuit 21 ░ 23, 14 connected to ++,
2I-0.4. Give a mixing amount of +1.0. The output end of the first mixing circuit 21 is connected to
the left front output signal L * ? + and the output end OUT ? 6 to be supplied, and the output
end of the second mixing circuit 22 is the light front output signal RjI. The output terminal OUT
? C2 to be provided is connected. Further, the output end of the eighth mixing circuit 23 is
connected to the phase shifter 25C of @ 1 in twos (91-o ') ░ 91-90') "1 ░ ░ 0 ░"; 49-36908-04
The output end of the 1 1 ironing circuit 24 is connected to the second phase shifter 26 (??0
░) and separated into (??90 ░), and then (?? on the first phase shifter 25 side). The output
end of the 0 ░ component and the output end of the (??90 ░) component of the second phase
shifter 26 are respectively connected to the fifth mixing circuit 22 and both give a mixing
amount of C knee 0.7, Further, the output end of the (?-90 ░) component of the first phase
shifter 25 and the output end of the (░ -0 ░) component of the second phase shifter 26 are
connected to the sixth mixing circuit 28, respectively. Both give a mixing amount of 100.7.
Forgive these! ??? Fifth. The output end of the mixing circuit 27.28 is an output end OUT for
providing the left pack output signal LB ', and an output end ou'r for providing the light pack
output signal RB ". Connected to In Fig. 181, the input terminal lN11 * "N11 shown in front of the
input end of the IITRT input signal vector respectively from the encoder side и и h & j, 9: ? 493690 ░" 0 " is there. Here, the first one. The second phase shifter 25 ░ 26 has, for example, a
configuration as shown in FIG. That is, the input end IN ? ? of the phase shifter 25 connected
to the output end of the second mixing circuit 22 in FIG. 2 has a coupling capacitor C! The base
electrode C of the transistor TR is connected via the terminal 1. Between the collector electrode
and the emitter electrode of the transistor TR, two Re series circuits in which two resistors R21
sFLfi and two capacitors 0ffileOn are respectively connected in series C2 are connected in
parallel. Let the middle points of the two Re series circuits be the output ends OUT,..., OUT of the
phase shifter circuit 25, and let the output end OUT be the output end of the ('-0 ?) component
side as described later. , OUT, side (?-90 ░) component side. In FIG. C, resistance Ru * Rkhtass
IRml etc. are the bias resistance and load resistance 1 etc of the transistor j. Thus, at the phase
shifter circuit 26 side of W & z, '49 -36908-06.1 IN 'is the output end of the mixing circuit 24 of
the above-mentioned @ 4 (two input ends, hereinafter the first The output end 0 [JT of the
copper component (J08) and the output end OUT of the copper component (?-90 ░) of the
copper component are obtained in substantially the same manner as the phase shifter 25. The
four outputs OUT, .about.OUT, s from these phase shifters 25.26 are for example resistors "t?
After the fifth mixing circuit 27 consisting of pR3 and the $ 6 mixing circuit 28 consisting of
resistance n + R311, the former writes 1 bit back on the LB0 output end 0 + JT, and the
repetition is the light pack ILB 'output end OUT ? C two connection Be done. In the figure,
reference numeral 29 denotes a code reciprocator connected on the tB1 side, and the left pack
LB 'and l8 (1' phase difference are placed on top of each other). Next, the operation of the SQ
decoder configured as described above will be described. That is, the point of the present
invention is that it is felt that the phase shift is limited only to the frequency range that has an
extremely expanding influence on the sound image localization, and the phase shifter is
simplified to 49-369 () 8-07 And it is in the place to get enough effect.
As described above, the left and right coding signals LT and RT can be obtained as in the first
configuration. The two mixing outputs are directly output by the output terminals OUT, OUT, as
well as direct mixing by the eighth mixing circuits 21 and 23. The former is the left front signal
LF 'and the latter is the right front signal RF'. Only those that pass through the fourth mixing
circuit 22.24 Through the second phase shifters 25 and 26, further, the fifth. The sixth mixing
circuit 27.211 combines and supplies to the output terminals 0UTn and OUT, the former being
left pack signal LB 'and the latter being right pack signal RB'. Next, the operation of the phase
shifter 25.26 in the above will be described. The phase shift is required based on the so-called Phase difference sound transfer phenomenon, and the phase shift is maintained at It is 49-36908-08 series which can improve the localization of the sound image. If
this phase shifter 25.26 is simplified and described as shown in FIG. 8ta, it is known that the
phase shifter 25.26 is based on the O, E division method of the transistor 6), as shown in FIG. 1)
Two transistors TR, '' pace, collector, emitter electrodes B, O. E: A capacitor C ? 'and a resistor
R1 1' are connected in series between the collector C and the emitter 8; a connection point
between the capacitor C21 'and the resistor is an output end O; It is assumed that a resistor R2,
? is connected to the resistor C and a resistor ?1 ? is connected to the collector C. When a
signal having a frequency with this circuit is input, the phase change at the output end OI: phase
change with the change of the frequency of the input signal is a vector diagram shown in FIG.
That is, when the human frequency is low, the output is almost in phase, and as the input
frequency increases, it is felt that the phase at the output end is delayed with respect to the input.
Therefore, if two circuits substantially similar to the above having different 90 DEG phase
characteristics from each other are used, it is possible to maintain a 90 'phase difference in a
required frequency range, as shown in FIG. B) и и и 49-36908-09 Figure 2 shows a specific
example of the respective phase shifters 25.26 for the left and right components based on such a
principle C), the action of which is substantially the same as described above Described.
Therefore, according to the SQ decoder as described above, the left and right coding signals are
mixed in a lump and the mixed output is directly supplied to the output terminal, and the output
terminal I: supplied via the phase shifter. By separately configuring the decoder, the phase shifter
can be extremely simplified, obtained, and sufficient effects can be obtained.
Furthermore, according to the present invention, there is an advantage that the separation effect
before and after can be made better.
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