JPH02306708A - Fadeout device - Google Patents

Abstract

PURPOSE:To make a fadeout end time constant by outputting a control signal so as to decrease the sound volume and sitting an output start time of the control signal so that the sound volume is zero at the fadeout end time. CONSTITUTION:A detection means 101 detects the sound volume level of a sound adjustment device 100 and supplies the level to a control means 102. The control means 102 in response to the sound volume level sets an output start time of the control signal so that the sound volume level is zero at a set fadeout time. When the control signal is outputted to the output start time at the set output start time, the sound volume adjustment device 100 reduces the sound volume level accordingly. Thus, the time of the end of fadeout is made nearly constant.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application j] The present invention relates to a fade-out device suitable for use in automatically reducing an output signal of an audio device.

``Prior art'' When dubbing an audio signal output from a sound source such as a compact disc player (CD player) onto a magnetic tape, etc., it may occur that the tape ends even though the audio signal continues. There are times when I have no choice but to interrupt recording. In this case, if you gradually lower the recording level until there is no sound before interrupting the recording, so-called fade-out, the unnaturalness caused by the interruption will become less noticeable.

To perform a fade-out, the operator must manually operate a variable resistor to reduce the recording level, and the equipment must be equipped with a function that automatically reduces the recording level when the operator presses a fade-out switch. This method is common.

Furthermore, recent CD players are beginning to be equipped with so-called time fade-out devices that automatically start fade-out after the specified time when the operator specifies a certain time (such as tape recording time). Fade out by this time fade out device will be explained with reference to FIG.

In the figure, the vertical axis of the graph indicates the ratio N of the output signal level to the input signal level of a volume adjuster or the like (a volume value). The volume value N takes a value from a minimum value of 0 to a maximum value of 1. Time t. When the operator specifies the time T for recording without fade-out, the time t is reached. Time TA has elapsed since time 1. The fade-out will start automatically. For example, the volume value N at time t
Let N be the volume value N, as shown in characteristic F, at time 1. It gradually decreases from there and reaches 0 at time t. When the volume value N becomes O, the output signal level becomes O, so the fade-out ends.

Also, time 1. When the volume value N at is N, (N, < N 3), the volume value N becomes 0 at time t, as shown in characteristic G, and the fade-out ends. In this manner, the conventional fade-out device consistently lowers the volume value N regardless of the volume value N at time t.

"Problems to be Solved by the Invention" According to the above-mentioned apparatus, the time at which the fade-out ends differs depending on the value of the volume value N at time t1. Therefore, when dubbing, there are problems such as the tape ending before the fade-out ends, or a non-recording state continuing after the fade-out ends.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fade-out device that can make the time at which fade-out ends substantially constant.

[Means for Solving the Problems] In order to solve the above problems, the present invention has the following features as shown in FIG.
A volume adjuster 100 that sets a volume value according to a supplied control signal, a detection means 101 that detects the volume value, and a fade-out end time that outputs a control signal so that the volume value decreases and a set fade-out end time. The control means 102 sets the output start time of the control signal according to the volume value so that the volume value becomes O at the time.

"Operation" First, the detection means 101 detects the volume value of the volume adjustment 18100 and supplies this to the control means 102. The control means 102 sets the output start time of the control signal according to the volume value so that the volume value becomes O at the set fade-out time. When the control signal is output to the volume adjuster 100 at the set output start time, the volume adjuster 100 reduces the volume value in response.

"Example" Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram showing the electrical configuration of an embodiment of the present invention.

In the figure, 1 is a volume adjuster, and 2 is a variable resistor provided therein. The variable resistor 2 is configured to be interlocked with a knob 30 and a stepping motor 31. Thereby, the volume value N of the variable resistor 2 can be set by manually operating the knob 30, and also by rotating the stepping motor 31. stepping motor 3
1 is configured to rotate in accordance with the supplied control signal Sl, and to set a specified volume value N in the variable resistor 2.

3 is an audio source, and the audio signal S3 outputted from this is attenuated via a variable resistor 2 and output to an output terminal 4.
is output from. Reference numeral 5 denotes a position meter, which detects the volume value N by interlocking with the variable resistor 2 and outputs a detection signal S.

It is configured to output as . The operation panel 6 and the display panel 7 are used to input data from an operator and display data to the operator, respectively. A microcomputer 8 is equipped with a processing device, a storage device, etc., and is configured to output an appropriate control signal S1 based on a preset control program. Furthermore, various programs for monitoring and controlling the audio source 3 are also set in the microcomputer 8.

Next, the operation of the apparatus shown in FIG. 2 will be explained. FIG. 3 is a flowchart showing an outline of the control program set in the microcomputer 8.

First, in step 11, the recording end time 1D is input from the operation panel 6. Next, in step 12, a detection signal S is input from the position meter 5, and based on this, the volume value N of the variable resistor 2 is determined in step 13. Next, in step 14, the time TF required for fade-out is calculated using the following equation.

T F= T Px N --(1) Here, Tp is time, and is set to a predetermined value in advance. Next, in step 15, the fade-out start time LA is calculated using the following equation, and in step 16, the process is waited until time tA.

t A-t o TF...
(2) Next, in step 17, the control signal S1 is output over time TF so that the volume value N gradually decreases. As a result, the fade-out ends after the time T has elapsed from time 1A, that is, at the recording end time to.

According to the above operation, the recording end time t. t. +1800
seconds (where t. is the recording start time), time TP is 10 seconds,
When the volume value N is set to IO, 5J, the fade-out characteristic changes as shown in characteristic A (solid line) in FIG. 5. That is, the fadeout start time tA or t. +
It will be 1795 seconds. Also, the volume value N is ro, 25
Fade-out characteristics when set to J and "l" are shown in characteristics B and C in the figure. According to these characteristics,
The fade-out start time tA is appropriately set according to the volume (+M N), and the fade-out end time t4 is constant.

In addition, in the above embodiment, as shown in the characteristics and E (broken line) in FIG. 5, when the volume value N is small, the rotational speed of the stepping motor 31 is lowered so that the change in the volume value N becomes small. If configured, it is also possible to start fade-out from time t1 regardless of the volume value N.

"Effects of the Invention" As explained above, according to the present invention, the time at which the fade-out ends can be made almost constant.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 3 is a flowchart of the control program of the embodiment, and FIG. 4 is a block diagram showing the configuration of the embodiment of the invention. FIG. 5 is a diagram showing fade-out characteristics according to an example. FIG. 5 is a diagram showing fade-out characteristics by a conventional time fade-out device. ■...Volume adjuster, 5...Position meter serving as detection means, 8. Microcomputer serving as control means.

Claims (1)

[Claims] a volume adjuster that sets a volume value according to a supplied control signal; a detection means that detects the volume value;
control means for outputting a control signal so that the volume value decreases and setting an output start time of the control signal according to the volume value so that the volume value becomes 0 at a set fade-out end time. A fade-out device characterized by: