JPS6016100A - Level display device of tape recorder - Google Patents

Abstract

PURPOSE:To attain the elimination of the need for long time recording of a peak level by displaying a larger level of a stereo input sound signal at normal state and switching and displaying its peak level by switch operation at a desired time. CONSTITUTION:L, R channel sound signals from terminals 1, 2 are AD-converted at an AD converting section 6 of a control section 5, stored in the 1st and 2nd memories 91, 92 of a memory 9, fed to a bar display device 14 and displayed on level display sections 141, 142. The content of the levels is compared, the larger level is transferred to a memory 93 and displayed on a numeral display device 15. The content of the 3rd memory 93 is transmitted to a memory 94, and the peak level of the input sound signal is stored. In turning on a switch 16, the peak level of the memory 94 is read and the peak level is displayed by flicker on the numerical display device 15 for nearly 5 seconds.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a level display device for a tape recorder, which can normally display the level of the greater of a stereo input audio signal at predetermined intervals, and can display the peak level by operating a switch at a desired time. The object of the present invention is to provide a level display device capable of switching and displaying.

When recording audio signals using an Arr recorder, the peak level is particularly monitored to set an appropriate recording level. As a means of displaying this peak level, each time constant for attack and release is set, such as responding quickly to the appearance of a peak level, and maintaining and displaying this for a predetermined time even after the peak level disappears. (1-FD, fluorescent display tube, etc. are used as display elements), and its display format is a bar-shaped display that turns on and off multiple light emitting points arranged in the direction of the level display axis. There are some that display light emitting points arranged for each level value, and others that display the number of light emitting points, excluding turning on and off.

However, conventional peak level display devices only display a peak hold for, for example, 2 seconds from the time the peak level occurs. Therefore, for example, when recording an audio signal over a long period of time, the operator must display the peak level. This has the disadvantage of having to be memorized in advance.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

FIG. 1 is a schematic block system diagram of an embodiment of the level display device for a tape recorder according to the present invention, FIG. 2 is a concrete block system diagram of the control device in FIG. 1, and FIG. 3 is for explanation of their operation. Flowchart; shows ~. The 1-channel and R channel audio signals that entered terminal 1.2 are sent to amplifier 3.
, 4 to a control device 5 comprised of, for example, a micro-1 computer. Control unit 1@5 is approximately AD
Conversion unit 6゜Write command unit 7. Read command section 8. The RΔM9. Switch detection section 10, transfer command section 11. Level comparison section 12. The control program is stored in the ROM 13 or the like (14).

The outputs of the amplifiers 3 and 4 are AD converted by the AD converter 6 of the controller 5.
The data are converted (step 20) and stored in the first memory 91 and second memory 92 of RΔM9 by the operation of the write command unit 7, respectively. This memory operation is approximately 3 Q Om5ec
The memory contents are updated by changing N one after another. At the same time, the contents of the memory are read out by the operation of the read command section 8, and are supplied to the rod-shaped display device 14, for example, in the level display section 14. +, '1/I2 is displayed in a bar shape (step 21).

The memory contents of the first memory 9+ and the FF12 memory 92 are level-compared by the operation of the level comparison section 11, and the value with the larger level is transferred to the third memory 93 by the operation of the transfer command section 11, where it is transferred for about 2 seconds. The temporary memory is rewritten and updated. When the memory contents of the memories 9+ and 92 are updated to a larger level value within this 2 sec memory time, the memory contents of the third memory 93 are also updated and then stored again for 2 sec. At the same time, the memory contents of the memory 93 are read out and supplied to the numeric display device 15, which consists of 7 segments, for about 2 seconds.
A digital numerical value is displayed for each ec (step 22).

Next, the memory contents of the third memory 93 are transferred to the fourth memory 94, and thereafter the memory contents of the memory 93 are transferred to the memory 94.
The memory contents of the memory 94 are rewritten and updated accordingly (step 23).
. In other words, the memory 94 always stores the peak level of the input audio signal.

Here, when the switch 16 is turned on, this is detected by the switch detection section 10 (step 24), and the peak level stored in the memory 94 is read out and supplied to the numerical display device 15, and the peak level that has not been displayed until now is read out. The contents of the memory 93 are switched and the peak level is displayed here as a digital value blinking for about 5 seconds (step 25). When the peak level blinking display for about 5 seconds ends, the display device 15
displays the memory contents of memory 93 again (step 2
6).

Here, when the switch 16 is turned on again during the peak level blinking display for about 5 seconds, this is detected by the switch detection section 10 (step 27), the memory contents of the fourth memory 94 are cleared, and the contents of the third memory are The memory contents of 93 are transferred to the fourth memory 94 (step 28).

Note that if you measure the difference between the peak level confirmed with this display device and the appropriate recording level and adjust the adjuster to the level of Polycomb etc. based on this difference, you can record at a signal level that does not reach the saturation level. It is possible.

Further, it is also possible to perform information processing on the contents of the fourth memory 93 using a computer or the like to automatically adjust the input level.

6- Also, although the control device 5 is configured with a microphone and a computer, it is not limited to this, and may be configured with other hardware and a circuit.

Above) As shown in the book, the level display equipment of the J-recorder according to the present invention includes a means for AD converting the level of the stereo input audio signal by 1%7, and a means for displaying the latest value of the AD converted stereo audio signal level. first and second memory means for rewriting the memory at intervals, and first and second memory means for reading out the contents of the first and second memory means and displaying one novel at regular intervals.
a level display means, a third memory means for comparing the contents of the first and second memory means and rewriting the value of the larger level at predetermined intervals; A fourth memory means to which the contents are transferred and rewrites and stores the values of a higher level, and normally the contents of the third memory means are read out and displayed at the level, while the contents of the fourth memory means are read out by switch operation. 3rd to read and display level
The first and second level display means are configured to constantly monitor the level fluctuations of the stereo audio signal, and the third one-novel display means is configured to display the normal level of the stereo audio signal. On the other hand, it is possible to check the peak level of the input audio signal at any desired time by operating a switch.In particular, when monitoring the peak level, for example 2. It is easy to handle and does not cause inconveniences such as having to memorize the peak level when recording voice signals of J: sea urchin spoken over a long period of time, which does not display the peak bold in seconds. Furthermore, since the display by the third level display means is numerical and the display of the contents of the fourth memory means is a blinking display, it is easy to see, and the level value can be understood as a numerical value, and this value can be used as a basis. And adjust the volume etc. level adjuster? 8 J: If you do this, you will be surprised at how well you can record at an appropriate level without reaching the saturation level.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a schematic block system diagram of an embodiment of the apparatus of the present invention and a concrete block system diagram of the control device in FIG. 1, and FIG. 3 is a diagram for explaining the operation of the apparatus of the present invention. ]-]ヂ＼7-1. 1.2...Audio blind input terminal, 5...Control device, 6
...△D converter, 7... Write command section, 8... Read command section, 9... RAM191-94... First to fourth memory, 10... Switch detection section, 11 ...
Transfer command unit, 12...Level comparison unit, 14...Bar-shaped display device, 15...Numeric display device, 16...Switch. 9- JP-A Showa GO-16100 (4) View 3rd figure 16 AD 笈娶 20 Memo, Su, +2 Memory 1; 21 @ return 1 and C destruction... Gi 1#-Table 15 22 Size 1し１方１や３ Memo January: Bottle light? 115shi

Claims (1)

[Claims] (1) Means for AD converting the level of the stereo input audio signal, and first and second means for rewriting and storing the latest value of the ΔD-converted stereo audio signal level at predetermined intervals.
and first and second level display means that read out the contents of the first and second memory means and always display the levels at predetermined intervals, and the contents of the first and second memory means. a third memory means that rewrites and stores the value of the higher level at predetermined intervals; and a fourth memory that rewrites and stores the value of the higher one novel to which the contents of the third memory means are transferred. and a third level display means that normally reads the contents of the third memory means and displays the level, and reads the contents of the fourth memory means and displays the level by operating a switch. A level display device for a recorder. (2) A special feature characterized in that the display by the third level display means is a numerical display, and the display of the contents of the fourth memory means is a blinking display for a predetermined period of time. A level display device for a tape recorder as described in Section 1.