Patent Translate
Powered by EPO and Google
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
111 rlham year case-number 4 G (-sum 48 675 111-9) Ill light-看 · residence Tokyo, Tokyo Otaku, Chidori 1 chome
ト リ Trio Co., Ltd.-屯 一 出 出 出 一 人 lI- -Kyoto, Meguro-ku, Aishodai 3chome, No.6, 7 0 Japan Patent Office Open Patent Gazette-Japanese Patent Laid-Open No.
Channel measurement tape, measuring tape
The present invention relates to a channel separation of a stereo reproducing apparatus such as
a tape recorder, and a tape for measuring a channel. In general, the channel selvage in a tape
recorder or the like is affected by the inter-signal and p-stalk components as a cause of
deterioration of the channel. There is a conventional channel separation, a tape etc. which
records a signal in the left track of the left and right 'channel' trough) for example, and not
recording anything in the right track. And the signal of the left track were measured by
comparison with the crosstalk component which comes to the right channel. In this case, the
playback signal level must be checked at any time, and the level of the recorded signal also needs
to be stable. Therefore using 4-seven tapes 4-nnerse Barresi, N l's determined il? : There was a
drawback such as not being able to read directly if it would be troublesome and time consuming
and labor intensive. The present invention eliminates the drawbacks as described above, and
channel separation between channels, / can be measured with a simple operation on the
measuring instrument side, and even if there are swaying fluctuations in the level of the signal
being ringed, the channel separation The purpose is to obtain a channel measurement tape that
can be measured by direct reading without calibrating the values of di and n. An embodiment of
the invention will now be described with reference to the drawings. In Fig. 111, 菫 is channel
separation, n. Track LK signal of the left channel in the partial enlarged view of the measuring
tape! The mouth is recorded, and the right channel EndPage: 1 track RE is a tape on which the
signal ei2 is recorded. These signals erl and e12 are signals of emerging frequencies, but if there
is crosstalk between the signals, they have a frequency difference that causes the number of beat
periodic solutions to be generated by the p stoke component and the reproduction signal. Is it a
signal? Is a part of a stereo 7 am (a stereo image of am, which is a subject of a channel 7-n, but in
this case, it will be described as an example to a tape of a tape recorder for convenience.
Therefore, the arrow line with the tape 10 both tigers, R and 11, indicates that the contact
surface of the tape head picks up the signals of both tracks. The signal ei recorded on the right
channel) rack R as the left channel e011 and the right channel eoz ', respectively, appears at the
output end of the tape head 2 when reproducing the above tape as gray. I will describe the case.
Here, assuming that the gain of the tape head 20 is A, the output signal eoj of the left channel is
expressed by the following equation. eoJ (tl = Aei1 (t) + B'ei = (tl-... river (It now eiI (t) = ccswlt,
ei2 (tl = cosW2t (town, W !: angular frequency) and eoi (t)) = ACOIL w, t + B cos 1 Ffit----(21)
Further, the equation K (2) is transformed into eoi (t)-'y (tlcoa (-"," t-(t))?-. , Here y (heavy! = A "+
B" + 2 AB cos (w,-town) t (amplitude function) (phase angle) Beiy (t) is considered to be a
crosstalk component B <A, and an amplitude function y (s) l! It is approximately expressed as
follows. y (t) & qA + B cos (town wt) t (wt-town: beat frequency), so the equation is "eol (t)" (A + B
cos (wa x w>) t) cow (--7- one @ -1 ( 1)) Then, this eol (t) is tested WAI! A crosstalk component
can be obtained by passing through a band-pass filter b having a bandwidth of the frequency
difference (Be 1 frequency) of the belled signal eil detected at la 1 and etl. Here, C1 is an
amplifier, dl is a smoothing circuit, and e is an automatic gain control circuit with a reference
voltage generation circuit, and the voltage EC8 detected by the detection circuit 1 □ and the
reference voltage 1ref of the reference voltage generation circuit C. Compared with the output,
amplified by its output J! The crosstalk level is controlled when the gain of c * is always
controlled and the voltage 1cl is equal to the reference voltage 1refK, and the resulting crosstalk
component is increased by 5K. ICIK I) Amplified to obtain the output signal, and more! (1) If it
flows, it can be taken as a DC voltage. It is preferable that the direct current voltage be indicated
by an indication meter or the like. Next, conversely, the same applies when the signal eil of the
left track L is sent to the right channel as well 4), detect the obtained goA (t) with the test
solution 111 @ a and pass the band 7v or b2 Cross talk component is obtained by the amplifier
C! To obtain an output signal. Here, the selection of the angular frequency -1, 13 is made by
selecting the number of beats per round (1-10--9 (+ "i") so that the component of i does not affect
the measurement error. It is sufficient to design the filter performance. The beat frequency (-2 to
-8) is preferably as low as possible 4J5 for measurement, but if it is too low, the measurement
error of the indicator itself will increase, so it is suitable to be around 20 Hi.
As described above, in this investigation, the channel separation and the track LBK on the left
and right channels of the cramping chip are recorded respectively with signals having different
numbers of circumferential fluids, but the two signals are not It is a signal having a frequency
such that a beat frequency is generated by the p stoke component and the reproduction signal.
For example, in the case of a tape on which a left track LKIKHz signal and a right track Rpc 11
KHz signal are recorded, there is 11 to 1 = alKHz, that is, 3003 (the number of beat liquid of z is
similarly 3 KHz and turtle 3 KHz). Then, 3 to 13 = (13 KH! となり300H! The result is that
the number of shoulder fluid is generated. This recorded EndPage: 2 signals of the emerging
frequency can use any number of circumferential fluids if the difference between them is
constant, as described above K. The channel separation of the present invention. The channel
separation of the banquet aK Stella 4113111 is accurate and easy by the operation tape. Have a
great effect of being able to Brief description of cleavage surface! I1 is a pro showing an
embodiment of the present invention, is a figure--Oki-shi]-· · · · · · · · · · Nner separage, il fixed? -F, 2
· · Stereo ^ live! if, L ... left track, R ... right) noble ivy, al, a ... detection circuit, b8, b ... band filter
cI, c2 ... 1 width circuit, di, d2: smooth-sliding circuit, C: reference signal generating circuit. JP-A
5O-87301 (Lime Tortoise other than the above mentioned place where the other people are
located, 13-13 Chidori, Ota-ku, Tokyo) Trio Co., Ltd., Tokyo Office Pedestrian office, Tokyo Office
Chidori, Ota-ku, Tokyo 13-13 13 F Rio EndPage in stock gold company Tokyo office: 3