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3. Patent applicant's address Nishi-Shinjuku 1-chome, Shinjuku-ku, Tokyo 1-chome, No. 8-1
(Shinjuku Building) (4) One letter of attorney ■ Japan Patent Office 0 JP5 JP-4l 05108134G2B
Specification Invention name stereo signal recording Reproduction method The left channel
signal of the stereo and the right channel and the 10,000 magnetic-tracks are recorded and
reproduced the sum signal of the above signal and R, and the low frequency component is
removed from the other magnetic track, A method of recording and reproducing nine stereo
signals by mixing, recording and reproducing the difference signal of the above signal and R and
the above control signal.
Detailed Description of the Invention The present invention relates, for example, to a method of
recording and reproducing signals for a tape recorder suitable for business use, for example O
When recording a design of a conference, for example, place several roosters on a table and If
you want to record the microphone output as it is together on a tape, divide the microphone into
two sets and make each microphone output a stereo bell on one tape. You can hear from another
person's remarks from the right, so it's easy to tell who's remarks], the rest of the notes and so
on. . In addition, recording cue signals (control signals) at the time of recording is convenient for
finding out later. Therefore, in a conventional business tape recorder, signals are recorded with a
magnetization pattern as shown in FIG. That is, in the person in FIG. 1, (4) is a magnetic tape, -b,
aυ-Q3 is a magnetic track in the forward direction, C! υ ~ (C) indicates the magnetic track in the
backward direction, and when recording in the forward direction, the track (11) is the left
channel signal, the track (I is the right channel signal B1 and the track キ ュ ー is the cue signal
Each track is recorded, and similarly, the left channel, channel signal, right channel signal R, and
cue signal are recorded at rt-t'3 at the time of recording in the backward direction to the track υ.
. Therefore, when recording as shown in FIG. 1 person, both of the above-mentioned objects can
be achieved, but a dedicated track a for the cue signal is required, (2) is required EndPage: 1
Therefore, the width of the track H of the track αV, Va, (2I), (2) and the track interval are
narrow, resulting in a decrease in reproduction level, a decrease in S / N, or an increase in
crosstalk between tracks. And so on. And this becomes especially noticeable when the tape (4) is
a cassette tape. In addition, a special magnetic head is required. -Also in the method of FIG. 1B,
the original signal. Only the track α 91 α, c υ, (2) for R are formed, in which case the lowfrequency component of R (for example, 150 Hz or less) is removed and the low-frequency
component is removed. The R signal is recorded, and the cue signal is a signal obtained by
removing the domain component of the signal '-R K i L T 5 I (LD, H' * fc (rl (21 J, (24 It records
simultaneously. Therefore, in this case, the track (1st, Q3. (21) and (23. Since the width of the
track and the track interval do not become narrow, there is no reduction in the reproduction
level, the reduction in S / N or the increase in the intertrack cross talk, etc. When the signal of (1)
is recorded and reproduced and it is disclosed in Japanese Patent Application Laid-Open No.
51048 / (2), the bass becomes lacking in force.
In addition, since the signal R and the cue signal are mixed and recorded, the recording level
must be lowered corresponding to the cue signal − as compared to the case where only the
signal L% R is recorded, so 8 / It becomes disadvantageous at the point of N. The present
invention does not require a dedicated track for the cue signal in view of such a point, and the
original information signal p (low band is missing), 87N is going to be lowered. An example will
be described below. Fig. 2 shows the recording system, and the left channel signal and the right
channel signal R of the stereo are respectively added through n input terminal 01, (d) and siamp
(s), (d). The signal is supplied to (d), V is added to the adding circuit (d), and the signal and R are
added to form a sum signal (L), and the sum signal (L + R) is added to the magnetic head through
the recording amplifier (d) 4m), and as shown in FIG. 4, the forward track αυ or reciprocation
in the backward direction is supplied to the subtraction circuit (ii) on the tape (4) and the signal
R (or signal B to signal) is supplied. L) is subtracted to be a difference signal (L-R), and this signal
(L-R) is supplied to the bypass filter (good) so that a low frequency component which does not
have a stereo feeling, for example, a component of 150 Hz or less It is removed. Then, the signal
(LR) from which the low-pass component has been removed is supplied to the adder circuit (c)
and the cue signal generation (gl-path-eg 100 Hz) is performed only when the switch 0 eta is
turned on. The cue signal is supplied to the adder circuit (4. Thus, from the summing circuit (C),
switch n? When '4' is not turned on, the signal (L-R) is taken out, and when the switch @ [eta] is
turned on, a sum signal Sa of the signal (L-R) and the cue signal is taken out. And this addition
time wr (4! 9) signal (L-R) or 8a is supplied to the magnetic head (c) through the recording
amplifier (d) and simultaneously with the signal (L), the tape α4 or the track α21 in the forward
direction is restored. It is recorded as a track of direction (c). また#! FIG. 3 shows the
reproduction system, and the head (4 m) reproduces a signal (L + 8) from the track Ut or Qυ
from the track Ut or Q こ の, and this signal (L + R) passes through the reproduction amplifier (a)
67). At the same time, the signal (LR) or Sa is reproduced from the track 021 or (2) by the head
operation, and this signal (LR) or 8a is supplied to the low pass filter through the reproduction
amplifier @. The signal 8a receives a cue signal, which is passed through the amplifier can to the
output terminal-and the signal (L-4t) from the amplifier or the signal Sa is supplied to the bypass
filter (2) Signal (L-R) is taken out, and this signal (L-R) [adder (last) and subtractor 6?
Supplied to Thus, in the adding circuit (G), the signals (L, Q) and (L, R,) are added together to take
out the signal, and the signal Ll / i, through the amplifier, the output terminal f11) And the
subtraction circuit 67) subtracts the signal (L−R) from the signal (L + R) to take out the signal R,
and this signal R is output through the amplifier f51t−. It is taken out to two children @ 2. Thus,
according to the present invention, not only recording and reproduction of signals can be
performed in stereo, but also recording and reproduction of cue signals can be performed.
Moreover, in this case, the tracks (13) dedicated to the cue signal as shown in FIG. 1 and (23 are
unnecessary, so the width and track interval of the tracks aυ, a2, Cυ and @ for the original
signal L% can be increased. Therefore, there is no reduction in the reproduction level or the
reduction in 8 / N, and the inter-track crosstalk can be achieved. Furthermore, although the lowpass component is not included in the signal (L-R) from the filter, since the low-pass component
is included in the signal (L + R) of Ive (b), terminal 6υ, I The resulting signal, RK, contains a lowfrequency component, so that even if the signal is a musical signal, powerful reproduction is
possible. Also, in this case, the low frequency component does not have a sense of stereo, so the
stereo effect does not decrease. Further, the signal (L-R) is a signal L% R1 (I, 10 R) f! Since the
level is low, mixing the cue signal with this signal (L-R) does not have to lower the recording level
and does not cause a drop of 8 / H. When reproducing a tape recorded by the method of FIG. 1B,
and when reproducing a tape recorded by the recording method of the present invention with a
tape recorder recording by the method of FIG. Since it can play back and play back cue signals, it
is compatible with other tapes and tape recorders.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a magnetization pattern
according to a conventional method, FIGS. 2 and 3 are system diagrams showing an example of a
recording system and a reproduction system according to the present invention, and FIG. FIG.
(Goods), (Goods) is a bypass filter, 顛 is a cue signal source / raw (R) path, l5) t; j Low pass filter
al. 出 願 Applicant Sony Corporation Figure 1 B Fig. Do Figure EndPage: 3
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