KR930004217B1 - Recording system with using digital fade-out device - Google Patents

Abstract

The apparatus fades in/out the audio signal, sets the duration of fading freely and displays the duration time to expand the function of a digital audio recorder. It includes a recording side attenuator (11) connected between a switch (SW1) and a digital signal processor (7) to attenuate the digital recording signal selected by the switch (SW1), a reproducing side attenuator (12) to attenuate the digital recording signal from the digital signal processor (7), a microprocessor (8) for controlling the two attenuators (11,12), and a duration set/display section (14) for displaying the time set.

Description

Recording device using digital attenuator

1 is a conventional digital recording system.

2 is an implementation circuit diagram of the present invention.

3 is a control signal timing diagram output from a microcomputer.

4 is a waveform diagram of an attenuator input and output signal according to the present invention.

5 is a damping level setting table of the present invention.

6 is a waveform diagram of selection of attenuation rate of the present invention.

* Explanation of symbols for main parts of the drawings

4: analog digital converter 5: digital analog converter

6: digital demodulator 7 digital signal processor

8: micom 10: input selector

11: recording side attenuator 12: playback side attenuator

13: time selection and attenuator direction selector SW1: switch

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus using a digital attenuator that enables recording or playback while using a digital attenuator to gradually increase or decrease an audio signal level.

In the conventional digital recorder, as shown in FIG. 1, an analog recording signal input through the input terminal 1 is converted into a digital signal through an analogue digital converter 4 and applied to one terminal of the switch SW1. And a digital recording signal input through the input terminal 2 is demodulated through the digital demodulator 6 and then applied to the other terminal of the switch SW1 to be switched by the output of the digital signal processor 7. By switching of SW1, one of the input signals of the input terminals 1 and 2 is selected, and the signal selected by the switch SW1 is applied to the digital signal processor 7 to be processed and then RF amplifier It is applied to (9) and recorded on the recording tape.

At this time, the switch SW1 switching signal output from the digital signal processing unit 7 is selected by the control signal of the microcomputer 8, and the microcomputer 8 checks the input of the input selection unit 10 to provide a switching control signal. Will be printed.

At the time of reproduction, the signal reproduced through the RF amplifier 9 is signal-processed by the digital signal processor 7 and then output to the output terminal 3 through the digital analog converter 5.

However, in the conventional digital recorder as described above, the switch SW1 is controlled according to an input source to record an analog signal or a digital signal, and the recorded signal is converted into an analog signal and output. The recorder was unable to perform the FADE IN function, which gradually increased the audio signal level, and the FADE OUT function, which gradually decreased.

In view of the above, the present invention allows a digital recorder to perform a fade in and fade out function using a digital attenuator. Another object of the present invention is to set a fade in and fade out time arbitrarily. It is to display the set time.

This will be described in detail with reference to the accompanying drawings of FIG. 2 as follows.

The outputs of the analog digital converter 4 and the digital demodulator 6 are selected by the switch SW1, and the digital signal processor 7 is applied to Rf (amplifier 9) and the reproduction signal of the RF amplifier 9 is digitally applied. In the digital recorder which the signal processor 7 outputs through the digital analog converter 5 and controls the digital signal processor 7 in the microcomputer 8 to which the input selector 10 is connected, the switch SW1 and A recording side attenuator 11 connected between the digital signal processing section 7 and attenuating the digital recording signal selected by the switch SW1, and connected between the digital signal processing section 7 and the digital analog converter 5, and a digital signal. A microcomputer 8 for applying a control signal for controlling the attenuation operation and the decay time of the reproducing side attenuator 12 and the recording and reproducing side attenuator 11, 12 that attenuates the digital reproduction signal output from the processing unit 7. And, said A time selector and attenuator direction selector 13 connected to the comb 8 for applying a signal for selecting a decay time selection and attenuator direction, and a set time display unit 14 connected to the microcomputer 8 to display a set time; It is composed of

At this time, the microcomputer 8 selects the attenuation setting data DATT, the attenuation data clock ACK, the recording latch signal ALER, and the reproduction latch signal ALEP by the time selection and the selection of the attenuator direction selector 13. Recording and playback side attenuators (11) (12).

The microcomputer 8 which recognizes the selection input of the time selector and the attenuator direction selector 13 stops the attenuation of the playback side attenuator 12 during recording and performs the attenuation only during playback. The selector 13 is configured to select a fade in or fade out function and set a decay time which is a duration of the fade in or fade out function.

First, the operation during recording of the present invention configured as described above will be described.

In recording, first, the switch of the input selection unit 10 is switched to select one of the analog signal input of the input terminal 1 and the digital signal input of the input terminal 2.

The microcomputer 8 recognizes the input of the input selector 10 and sends a switch SW1 control signal to the digital signal processor 7 to control the switching operation of the switch SW1, thereby controlling the analog digital converter 4 or the digital copy. The signal output selected among the outputs of the jaws 6 is applied to the recording side attenuator 11 via the switch SW1.

On the other hand, by pressing the fade in or fade out key of the time selection and attenuator direction selector 13 to select a fade in or fade out operation, and press the numeric keys together to set the decay time to perform the fade in and fade out function.

When the fade in or fade out function and the decay time are selected by pressing the key of the time selector and the attenuator direction selector 13 as described above, the microcomputer 8 recognizes the decay time and displays the set time on the set time display section 14. The attenuation setting data (DATT), the attenuation data clock (ACK), and the recording latch as shown in FIG. A signal ALER or a reproduction latch signal ALEP is output.

At this time, the attenuation setting data DATT output from the microcomputer 8 to the recording side and reproduction side attenuators 11 and 12 is determined by the specifications of the recording side and reproduction side attenuators 11 and 12, and is recorded and reproduced. The output is selected depending on how many bits (BIT) the side attenuators 11 and 12 are to set the level, and if 7 bits of data, 128 levels of 2 ⁷ data are shown in FIG. As it is.

That is, when the fade-out function is selected in the time selector and the attenuator direction selector 13, the microcomputer 8 recognizes this and sets the 7-bit attenuation setting data DATT from the initial 0 to 127 levels as shown in FIG. When the fade in function is selected and the fade in function is selected, the attenuation setting data DATT is continuously output from the initial 127 level to the 0 level.

The attenuation setting data DATT is generated by an internal program by recognizing the input of the time selector and the attenuator direction selector 13 in the microcomputer 8 and the attenuation setting data DATT is generated in the attenuation data clock ACK. It is applied to the recording side attenuator 11 and the reproduction side attenuator 12. At this time, the microcomputer 8 outputs the recording latch signal ALER and the reproduction latch signal ALEP to record the attenuator 11 and playback. The operation of the side attenuator 12 is selected.

That is, during recording, the attenuation setting data DATT, the attenuation data clock ACK, and the recording latch signal ALER are output so that the recording side attenuator 11 latches the attenuation setting data DATT.

At this time, the reproduction latch signal ALEP is maintained in an 'off' state.

The recording side attenuator 11 is composed of arithmetic elements and latches the attenuation setting data DATT by the recording latch signal ALER to attenuate the digital recording signal selected by the switch SW1.

That is, during the fade-out function, the attenuation setting data DATT changes from 0 to 127 levels and is continuously output. Accordingly, the recording side attenuator 11 attenuates the digital recording signal from 0 dB to -∞ to the digital signal processor 7. (See Figure 4).

However, during the fade-in function, the attenuation setting data DATT is changed from 127 to 0 level to be continuously output. Accordingly, the recording side attenuator 11 attenuates the digital recording signal selected by the switch SW1 from -∞ to -dB. The digital signal processor 7 is applied to the digital signal processing unit 7 (see FIG. 4) to gradually increase the attenuation level of the digital recording signal.

Therefore, when the fade-out function is selected during recording, the digital recording signal is gradually attenuated and recorded. If the face-in function is selected, the digital recording signal is gradually increased and recorded.

At this time, since the reproduction latch signal ALEP is 'off' in the reproduction side attenuator 7, the attenuation operation is not performed at the time of recording, so that the digital recording signal processed by the digital signal processing unit 7 is transferred to the digital analog converter 5 as it is. When applied, the recording side attenuation signal is output only as a monitor signal.

In the reproducing operation, the signal recorded on the tape 15 is processed by the digital signal processor 7 through the RF amplifier 9 and then applied to the reproducing side attenuator 12. At this time, the microcomputer 8 selects a time. And the input of the attenuator direction selector 13 is checked to drive the reproduction side attenuator 12 in the same manner as the recording side attenuator 11 described above.

That is, in the reproducing operation, the attenuation setting data DATT, the attenuation data clock ACK, and the reproducing latch signal ALEP are output as shown in FIG. As shown in FIG. 4, the digital reproduction signal is operated to fade out or fade in.

Here, the configuration and operation of the reproduction side attenuator 12 are the same as those of the recorded recording side attenuator 11, but operate only during the reproduction operation to be operated.

In this way, the signal attenuation time of the recording side attenuator 11 and the reproduction side attenuator 12 which receives the control signal of the microcomputer 8 and attenuates the digital signal is selected by time selection and numeric key input of the attenuator direction selector 13. It is done.

That is, the decay time is selected by the numeric keys in the time selector and the attenuator direction selector 13, and the microcomputer 8 recognizes this and displays the selected decay time on the set time display section 14, while the decay setting data (a DATT) to adjust the data output speed.

That is, as shown in FIG. 6, if the attenuation setting time is set to X, the attenuation time is reduced. Therefore, the attenuation setting data (DATT) is output at a high speed and the audio signal level is rapidly attenuated. Will be.

Herein, the decay time refers to the time during which the fade in or fade out proceeds, and the adjustment of the output speed of the decay setting data DATT according to the decay time setting depends on the internal program of the microcomputer 8.

Therefore, the microcomputer 8 records the attenuation setting data DATT, the attenuation data clock ACK, and the recording latch signal ALER according to the decay time during recording and the selection of the fade in or fade out function as shown in FIG. And the recording side attenuator 11 performs a fade in or fade out function for a set attenuation time. At this time, the reproduction latch signal ALEP is turned off so that the reproduction side attenuator 12 Without performing the attenuation function, the output signal of the digital signal processing unit 7 is directly applied to the digital analog converter 5 and output as a monitor signal through the output terminal 3.

That is, the recording side attenuator 11 outputs the input signal as shown in FIG. 4 (a) as shown in FIG. 4 (b) by the control signal of the microcomputer 8, and the digital signal processor 7 records the input signal as shown in FIG. The output signal of the attenuator 11 is applied to the RF amplifier 9 to be recorded on the tape 15.

In this manner, during recording, the recording side attenuator 11 performs a fade in or fade out function of the signal selected by the switch SW1 within the decay time set by the control signals DATT, ACK, and ALER of the microcomputer 8. The signal attenuated by the attenuator 11 is recorded by the digital signal processor 7 via the RF amplifier 9 on the tape 15. At this time, the reproduction side attenuator 12 does not perform the attenuation operation but uses the recording side attenuation signal as a monitor signal only. Will be printed.

On the other hand, during playback, the attenuation time and fade in or fade out are selected by the time selector and attenuator direction selector 13 as in recording, and the control signal (as shown in FIG. DATT, ACK, and ALEP) to attenuate the playback signal.

That is, the signal recorded on the tape 15 is attenuated by the signal output from the RF amplifier 9 through the digital signal processor 7 at the reproduction side attenuator 12 as shown in FIG. Through the output terminal (3).

Therefore, even when the digital recorder is playing, the fade in or fade out function can be performed, and the decay time can be arbitrarily adjusted.

As described above, the present invention can perform a fade in or fade out function which is not performed by a conventional digital recorder at the time of recording or playback, and can also arbitrarily select a decay time for performing the fade in and fade out functions. The effect is to provide a multi-function.

Claims (1)

The output of the analog digital converter 4 and the digital demodulator 6 is selected as the switch SW1 and applied to the RF amplifier 9 by the digital signal processor 7 and the reproduction signal of the RF amplifier 9 is transmitted to the digital signal. In the digital recorder which the processing unit 7 outputs through the digital analog converter 5 and controls the digital signal processing unit 7 in the microcomputer 8 to which the input selector 10 is connected, the switch SW1 and the digital recorder. A recording side attenuator 11 connected between the signal processing section 7 and attenuating the digital recording signal selected by the switch SW1, and connected between the digital signal processing section 7 and the digital analog converter 5, and a digital signal processing section. A reproduction side attenuator 12 for attenuating the digital recording signal outputted at (7), and a microcomputer 8 for applying a control signal for controlling the attenuation operation and the decay time of the recording and reproduction side attenuators 11, 12. And, said A time selector and attenuator direction selector 13 connected to the comb 8 for applying a signal for selecting a decay time selection and attenuator direction, and a set time display unit 14 connected to the microcomputer 8 to display a set time; Recording device using a digital attenuator, characterized in that the configuration.