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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a trunk pattern of a
magnetic tape used to explain the present invention, FIGS. 2 and 3 are characteristic diagrams
used to explain an example of a noise reduction circuit, and FIG. It is a systematic diagram of an
example of the present invention. 1 is a magnetic tape, 6R is a recording input / output
characteristic, 6P is a master power characteristic, I is a reproducing head, and 13 is a noise
reduction circuit.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder,
for example, a magnetic tape in which a four-channel stereo signal is recorded as four tracks, a
two-channel full-length track, that is, two out of four tracks simultaneously. When the noise
reduction-path is established, it is intended to prevent the negative shadow 4It of the disturbance
of the KL4 frequency characteristic. As an example, in the cassette type fitting, a 2-channel stereo
is interposed with a non-signal image area in the direction of 10,000 tape runs (1) / (i) row
shown by the arrow in the factor A on the magnetic tape 111. The left signal (L) and the right
signal (R) are recorded as separate tracks (2a) and (2b) by separate magnetic heads (actually, 2
channel heads), and the track (3a) is similarly obtained in the other tape running direction. (3b)
and (-) two-channel stereo left signal (L) and right signal (R) are recorded to be recorded, and at
the time of mastering, track '2a) (2b) simultaneously and separate magnetic heads The same
reproduction operation is performed for the 11 friend tracks (3a) and (3b) which are scanned by
the VC. My friend. In the case of recording 4-channel stereo signal -q on the magnetic tape of the
same size, in consideration of compatibility with 2-channel reproduction, as shown in FIG. 1 BK,
each of the tracks (2a) and (2b) It is written that tracks (4Jl), (4b) and (4c), (4d) are formed by
interposing a non-signal area within the width corresponding to W, K of width, and similarly,
tracks (3a) and (3b) The recording is performed such that the tracks (5m), (5b) and (5c), (5d) are
formed within the width corresponding to the respective wedges W0). Tracks (4a) and (5a) Kl!
Stereo left front (2) interval, 'signal (Lp) is recorded, stereo left rear signal (LB) is recorded on
track (4b) & (5b), track (4c) and (5c) nine is stereo The right lateral signal (Rp) is recorded, and
the stereo right rear signal (RB) is recorded on the tracks (4d) and (5d). Magnetic tape! The 1 @
tape @ is 3, 81 (.box-solid.) At the position of the Phillips type, and when eight tracks are formed
in the process 9 shown in FIG. 1B, one track width becomes extremely narrow. Therefore, unlike
the Phillips-type standard, a cassette having a tape width such as 4) with almost double the tape
width is considered. By the way, when the 4-channel stereo signal is recorded with the track
pattern shown in Fig. 1B and reproduced with the magnetic tape H) t-2 channel head, the track
(4aH4b) is one magnetic head in one tape running direction. The tracks (4c) and (4d) are
simultaneously reproduced by one magnetic head of the rat while being reproduced
What should be noted here is recorded in the processing of the track pattern shown in Fig. 1A.
For example, compared with the reproduction output level in the case of track (2a) k single
magnetic head re- (3)-, no regrowth, no signal area intervenes between tracks (4a) and (4b) In
order to reproduce these simultaneously with one magnetic head, the noble power level is
lowered. Recently, tape recorders are often equipped with noise reduction [circuits such as dolby
type]. Is the MOIA an input / output characteristic for a signal with a frequency in the middle
range in the dolby one? In the same figure, (6R) shows the recording / output input / output
property, and (tiP) HA raw adult output characteristics. For example, if the @ 廿 input level is -20
(dB), the tape recording level becomes -16 (dB) according to the recording input / output
characteristics (sR), and this is -20 (dB) playback output according to the horse main input /
output characteristics (6P) It becomes a level, and it becomes a linear thing as shown by the
value-as a whole man's force characteristic 結局 as a whole. In the noise reduction circuit, the
adjustment is properly performed 4) When the effect of the Km period is inserted, the track
pattern shown in FIG. 1B & 1 is the track pattern shown in FIG. 41 '2-through the sound process,
and it is played back with a 2-channel Chie Precoater via a noise reduction circuit (reproduction
processor) respectively [tli, IE1 Figure AK shown In the same manner as in the case of the
alignment error, the reproduction frequency decreases as described above compared to the case
of ̶, and the 褥 frequency inertia does not become flat (indicated by a broken line) in ↓ 3 as
shown in 萬 3 There is an intermittent point that becomes disordered as For this reason, there
has been a point that the 1i tolerance for performing two-channel reproduction on a magnetic
tape recorded with a four-channel stereo signal is unsatisfactory. In addition, as shown in FIG. 1A,
a two-channel noise-discharge tape 111 (i--4 thousand channels regenerating with a chie-precoater of recurrent insects) is inconvenient. This note is intended to be the provision of the above
mentioned interval recorder-swept chief recorder. In the case where a small 4- to 4-tuple with the
main consideration & t-2 channel frame king is shown, only the configuration of the bite channel
is shown, and the four channels also have the same configuration. In Fig. 4 the output of the (5) ·1 reproduction amplifier in the reproduction amplifier is shown on the + (7 Ha · power channel
Yayoi head 、 and I 8) output of one of the switches (9) 11 is supplied to the input terminal
(IOJI), and the input terminal (lob) K of the switch j town is supplied via a table consisting of a
resistor 1111 and aΔ.
The reproduction signal obtained at the output terminal (10c) of the switch (9) is led to the
reproduction output terminal +151 through the noise reduction path 113 (one side of the ruby
reproduction processor) and the amplifier 1I41t-. In this case, the switch (9) is switched
depending on whether the magnetic tape to be reproduced is recorded on two or four channels,
and is recorded on two or more channels (track pattern in FIG. 1A). When playing back the tape,
the input terminal (LJυ) and the output terminal (IOc) are continuous, and the 4f channel
recording (track pattern in FIG. 1B) magnetic tape t − When playing back, the input terminal (
lea) and the output terminal (LOG) are kept shaking. Therefore, comparing the case of lllj people,
4 nayan nel tapes recorded-2 mountain squeezed magnetic tape compared to the time when v 2%
v 2 of the 4 trunks are produced. The reproduction output is attenuated more when reproducing
the track of (5) with a separate magnetic head (6)), t. By this level correction, even when any four
of the track pattern of two or four nayannels are formed on the magnetic tape, it is possible to
avoid the fourth disorder which decreases in the re-frequency characteristic. so! Iる。 In the
history, the track width W1 會 1.05 (m) in the case of 2 Nyannel recording and the track width
W 2 tO, 4 (■) in the case of 4 Nyannel roar as an example, this track width The gel reduction
caused by over-exposure becomes 8201 og to -2,4 (dB) 1.05. Although this 1 it-level correction is
good, this is the case, for example, when the stereo left front signal (Lp) and the stereo left rear
signalization B) have exactly the same sound. Generally, the signals Lp and LB are separated, and
the amount of sleeve at this time is 0.4204 ogso − = − 8, 4 (dB) 1.05, but in this case it is
considered as a completely different signal. In the case where the correction is excessive 9 and 鎌
特性 III wave number characteristics (7) for a while, the high frequency is increased. Therefore,
the correction amount is an average value of (-8, 4)-(-2, 8) -5, when the above-mentioned signals
Lp and LB are considered to be completely the same, and when it is considered different. If 6 = −
= − 2, 8 (dB) 2 is adopted, if the signals LP and LB are similar sounds, the ink area slightly rises,
and in the case of only one thousand of the signals LP and LB. Is practical because the high
frequency will be slightly reduced.
Of course, the same holds true for the right channel. As is apparent from the above explanation,
according to one consideration, the four-channel stereo value code intervenes in the black signal
area and separates two tracks from each other into the magnetic track 1 'which has been rejected
as separate tracks. Even when playing back with a common magnetic head, there is no stupid
effect caused by bouncing the Ling Lon low pass circuit, noise reduction curving noise and 4channel sound recording and 2 good magnetic tape Channel 4j% can be a viable tape recorder.
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