JPS63113886A - Level meter in digital equipment - Google Patents

Abstract

PURPOSE:To optionally change the range or interval of a level displaying by extracting the data to be displayed from the data for driving a level meter in accordance with the designated displaying range and the displaying level interval and making plural displaying elements light up. CONSTITUTION:A displaying range interval designating part 6 designates the minimum value and the maximum value of a signal level to be displayed by a key input and designates the displaying range and the displaying level interval for one displaying element. A timing pulse generating circuit 7 for data extraction generates a timing pulse in accordance with the conditions designated by the designating part 6 and outputs successively it to a data extracting circuit 8 for driving a level meter. From a signal processing circuit 3, the data, in which the size of the level of a PCM signal to input or output is discriminated based on the reference level of a constant interval, are inputted to the circuit 3. A level meter driving circuit 2 selectively lights up plural displaying elements of a displaying part 1 by the data extracted by the circuit 8. Thus, a various displaying can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a level meter for a digital device such as a digital recording/playback device that performs recording and playback using digital signals.

[Summary of the invention]

This invention provides a level meter for digital equipment.
By providing means for arbitrarily specifying at least one of the display range and display level interval, and means for extracting the data to be displayed from the level meter driving data according to the conditions specified by the means, the level display can be improved. This allows the range or interval to be changed arbitrarily.

[Conventional technology]

In recent years, digital devices that record and play back music using digital signals such as PCM signals have been commercialized for consumer use. Digital level meters that directly determine the level and display the level using a large number of display segments in the form of a bar code, for example, have come into widespread use.

Such a conventional level meter is generally constructed as shown in FIG.

Then, the signal processing circuit B selects either the PCM signal to be transferred to the D/A converter 4 that outputs an analog signal, or the PCM signal transferred from the A/D converter 5, and performs preset sampling. The magnitude of the absolute value is determined every cycle, and the maximum value within a certain period of time is held for a certain period of time, which is converted into level meter driving data and output to the level meter driving circuit 2.

The level meter driving circuit 2 displays the level by selectively lighting up a plurality of display elements 1a to 1n of the level meter display section 1 as shown in FIG. 4 according to the level meter driving data.

[Problem that the invention seeks to solve]

However, such conventional digital level meters can only display at predetermined level intervals and level ranges.

For example, 3dB with 10 display elements (segments)
If the level is set to be displayed in a level range of -12 dB to +15 dB at intervals, the level can only be displayed within this interval and display range, so it is not possible to use a signal that allows level judgment in small units like a PCM signal. However, there was a problem that its effectiveness could not be fully utilized.

The object of the present invention is to solve the problems of level meters in such conventional digital equipment.

[Means for Solving the Problems] Therefore, the level meter in the digital device according to the present invention includes a means for arbitrarily specifying at least one of a display range and a display level interval, and a level meter according to the conditions specified by the means. and means for extracting data to be displayed from the meter driving data.

[For production]

According to this level meter, the data to be displayed is extracted from the level meter driving data according to the specified display range and display level interval, and the level is displayed by lighting up multiple display elements of the display section. Enlargement/reduction of one display range, enlargement/reduction of display level intervals, partial display, etc. can be performed arbitrarily.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing the configuration of a level meter according to the present invention, and the same parts as in FIG. 3 are given the same reference numerals.

In this embodiment, each block 1 is similar to the conventional example shown in FIG.
5, a display range/interval specifying section 6, and a data extraction timing pulse generation circuit 7.

A level meter drive data extraction circuit 8 is provided.

The display range/interval specifying section 6 can arbitrarily specify the display range (dynamic range) by specifying the minimum and maximum values of the signal level to be displayed using keys or the like, and furthermore, the display range/interval specifying section 6 can specify the display range (dynamic range) for each display element. / /(/L/ (7)
The tlfi interval is also, for example, 1.5 dB, 3 d + 3.6
It can be arbitrarily specified such as dI3.

The data extraction timing pulse generation circuit 7 is.

According to the display range and display level interval conditions specified by the display range/interval specifying section 6, a timing pulse as shown in FIG. 2(b) is generated for extracting level meter driving data, The data is sequentially outputted to the level meter driving data extraction circuit 8.

On the other hand, the signal processing circuit 3 inputs or outputs P
The level of the CM signal is set to a reference level at regular intervals.

level meter driving data (for example, a range of 45 dB at 1.5 dB intervals).

The level meter driving data extraction circuit 8 extracts data to be displayed from the serially inputted level meter driving data at the input timing of the data extraction timing pulse and sends it to the level meter driving circuit 2.

Therefore, the level meter drive circuit 2 selectively lights up the plurality of display elements of the level meter display section 1 to display the level based on the extracted data.

For example, in the case of the example shown in FIG. 2, level meter driving data Do''Dn (Do is the minimum level).

Dn is the maximum level data), DOID2 #D
3 +DS l . . . , Dn data are extracted, and each of the data is sequentially made to correspond to each of the display elements 18 to 1n as shown in FIG. 4 of the level meter display section 1.

The display elements from the display element 1a that displays the minimum level to the maximum level where the extracted data exists are turned on every display cycle.

Therefore, the number of data extraction timing pulses within one display period is at most the same number as the number of display elements of the level meter display section 1.

In this way, the display range and display level interval can be changed arbitrarily within the level interval and maximum level range of the level meter driving data.

For example, as in the above example, the display tube 8 (dynamic range) is maximized and the data for driving the level meter is thinned out and extracted, thereby making it possible to widen the display level intervals (not necessarily at equal intervals). However, conversely, the display accuracy can be improved by narrowing the display range and making the display level intervals darker. It is also possible to enlarge and display a specific level range.

〔Effect of the invention〕

As explained above, according to the present invention, at least one of the display range or display level interval of a level meter in a digital device can be changed arbitrarily, so the display range can be expanded or contracted, or the display level interval can be changed as necessary. It becomes possible to perform a wide variety of displays such as enlarging/reducing the image and displaying a -partial portion of the image.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a timing diagram showing an example of the relationship between level meter driving data and data abstraction timing pulses, and FIG. 3 is also used to explain its operation. FIG. 1 is a block diagram showing an example of the configuration of a level meter in a conventional digital device. FIG. 4 is a diagram showing an example of the arrangement of display elements of the level meter display section. 1...Level meter display section 2...Level meter drive circuit 3...Signal processing circuit 4...D/A converter S...A/D converter 6...Display range/interval specification section 7 ...Data extraction timing pulse generation circuit 8...
・Level meter drive data extraction circuit Figure 1 and Figure 2

Claims (1)

[Claims] 1. In a level meter that displays a level by selectively lighting up a plurality of display elements of a display section based on level meter driving data corresponding to the level of a digital signal in a digital device, the display range and The present invention is characterized by comprising means for arbitrarily specifying at least one of the display level intervals, and means for extracting data to be displayed from the level meter driving data according to conditions specified by the means. Level meter in digital equipment.