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JPS5213831

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DESCRIPTION JPS5213831
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a prior art signal level display device, and FIG.
2 is an embodiment of the signal level display device of the present invention. Explanation of
main drawing numbers, 16 ииииии Signal level comparator, 17.18 ииииииииии Klang circuit, 19 иииии Amplifier
for meter, 20 ииииииииииии Meter as a means 21.22 ... resistance. (I) 67-July, '32 -i3831 (2) FIG.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal level
display device for use in a tape coder or the like, and more particularly to a device 2 for
displaying signal levels of a plurality of channels by one display means. In general, in stereo-type
tape recorders, a total of two meters, one for each channel, are provided to display the level of
recording ? 9. On the other hand, there are many simple stereo-type tape / coders that display
the signal level of the left and right channels t: / channel with a single meter because of economy
and ease of level adjustment. The signal level display device of such a stereo tape coder is
constructed as shown in FIG. In the figure, (1), (2) and (3) are the left channel input terminal,
output terminal and amplifier, (4), (5) and (6) are the left channel input end large output terminal
and amplifier ( 7) is a combining circuit that combines the left and right signals, (8) is a meter
amplifier that amplifies the output signal from the combining circuit (7), and (9) is a meter that
displays the level of the signal. In the circuit having such a configuration, the signal applied to
the input terminal (lX41) is amplified by the amplifier f3x6, synthesized at the synthesis
frequency 7) and then amplified by the meter amplifier 8) and applied to the meter (9) The bell is
displayed. 3 However, the display as described above has the following disadvantages. When
using a tape recorder that adjusts the relationship between the bell and meter of the signal
applied to the magnetic head in the recording in the same channel and same level same phase
recording, that is, monaural recording, the user makes a sound 2 7 Adjust the level to the
optimum level with the meter, and the signal level applied to the magnetic head of the higher
level channel at the back of the main channel on the left and right becomes excessive, so It is
recorded. In reverse, adjust the relationship between the bell and meter of the signal applied to
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the magnetic head by ? channel input in ttC mode [7, use a tape recorder (1, optimum with
meter, m adjusted to bell Even in the case of monaural recording, "t (the signal applied to the
head at the end of a period) level is too small-and is recorded on the magnetic tape with a poor
C3N ratio. Furthermore, when the phase of the signals of the left and right channels are in
antiphase with each other at the same level, the meter will not be twisted regardless of the
manual signal level. The present invention seeks to provide a signal and 4-bell display which
eliminates the aforementioned disadvantages and will be described with reference to the
embodiment shown in FIG.
In the figure, ?0. (Ill and 1J21 respectively correspond to the input needle, output terminal and
amplifier of the right channel, (?),-and ? are the input terminal of the left channel, output
terminal and amplifier, and (?) corresponds to the left and right channels respectively) Is a 1level comparator that consists only of the largest classical play pigeons and sends out only the
largest signal in each channel, ? ? is for the meter that amplifies the output signal from the
signal and bell comparison 2 ? 0. An amplifier, ?, is a meter for displaying a signal bell. In
addition, a resistance C diagram is connected in parallel to each of the above-mentioned
classically winding ? teeth, and such resistance @ 4 is a diode in which a signal bell connected to
the input terminal noaa constitutes a signal level comparison ms. When the input signal is
smaller than the value for conducting the signal, it has the function of leading the input signal to
the meter amplifier. The present invention is configured as follows-E, and the operation will be
described next. When the level of the signal applied to the input terminal ??a is smaller than
the value at which the diode is conducted, the signal amplified by the amplification 5aeas is
applied to the amplification for the meter by the resistors (2) and (2). After being amplified by
the amplifier, the level is displayed by the meter. Next, the case where the level of the feedback
signal is greater than the value at which the diode @ ? is turned on and the level of the right
channel signal is greater than that of the left channel will be described. In this case, the output of
the right channel clamp 471 which composes the rental charge and the bell comparison is larger
in magnitude than the output of the left channel clamp and the diode is reversely biased. As a
result, the signal of the right channel is applied to the meter amplifier (d) through the diode (2)
and the capacitor (d), and the bell is displayed on the meter at. Also, if the left channel signal bell
is larger than the right channel signal level, the diode (2) is reversely biased, so the left of the
meter amplifier goes through the diode and the capacitor. The channel's signal is applied and the
meter displays the bell. As described above, in the signal level display device according to the
present invention, the signal level comparator displays the bell of the maximum four levels of
signal in each channel, so that the user can appropriately use the meter ?. When the level is set
to a proper level, the level of the signal applied to the magnetic head of each channel can be
recorded on the magnetic tape at an optimum level without becoming excessive or excessive.
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