JPH03203069A - Audio device reproducing method - Google Patents

Abstract

PURPOSE:To eliminate unnaturalness at a music interval by gradually increasing background noise with fade-in processing prior to music and gradually decreasing it at the end of the music. CONSTITUTION:When a random play is requested by an operating panel 9, playing order of the random play is decided by a system controller 5, and also the presence of background noise at the beginning and end of each music is decided, and then they are stored in a built-in memory 5a. Subsequently, the i-th music is searched, and upon completion of the search, reference is made to the stored contents of the memory 5a, and if the background noise exists, an instruction is issued to a fade control part 6 to execute the fade-in processing. Then, the control part 6 is operated to perform the fade-in processing on an i-th PCM sound data to be inputted from a data processor 4 for a given period of time, so as to gradually increase the sound volume. Afterward, the normal reproducing processing is performed, and also if the background noise exists after completing reproducing but before the given period of time from the end of this music, the fade out processing is carried out to gradually decrease the sound volume.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for reproducing audio equipment, and particularly to a method for reproducing audio equipment when live recording is being performed.

<Prior Art> There are studio recording discs and live recording discs of compact discs (CDs), and the studio recording discs have silent portions between songs as shown in FIG. Note that Me indicates the end of the jth song, and Ms indicates the beginning of the (j+1)th song.

On the other hand, on the live recording disc, as shown in Figure 8, background noise such as the second clap between songs is recorded seamlessly. Furthermore, the 8th
In the figure, Me indicates the end of the jth song, and Ms indicates the end of the jth song (
j+1) indicates the beginning of the music, Me' indicates the end of the j-th song, and Ms' indicates the beginning of the (j+1)th song. If such a live recording is played back in order from the beginning, the user can enjoy the music while experiencing the atmosphere of the concert hall.

<Problems to be solved by the invention> In digital audio players such as CD players, S
There is a method of programming the playing order of the songs being played and playing the songs according to the programmed order (program play). There is also a method in which when a random performance mode is selected by a predetermined key operation, the microcomputer randomly determines the order of the songs to be played using random numbers, and the songs are played according to the order of performance (random play) 6 Such program play or When playing a live recording disc using random play, there will be silence while searching for the next song, so the background noise may suddenly stop and become silent, or the background noise may suddenly appear. , resulting in an unnatural playing condition.

That is, as shown in FIG. 9, the music of the currently played song ends at time Me', and then background noise such as applause continues, but at time Me, the background noise suddenly stops and a search state is entered, and from then on, the music of the first song is played. There is silence while searching for
When the search for the (i+1)th song to be played is completed, a loud background noise suddenly appears at the beginning Ms of the song.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a playback method for audio equipment that can eliminate unnaturalness between songs when a live recording disc is played by program play or random play.

Another object of the present invention is to perform fade-in processing to gradually increase background noise before a song, and to perform fade-out processing after a song to gradually reduce background noise to eliminate unnaturalness between songs. An object of the present invention is to provide a playback method for audio equipment.

Another object of the present invention is to provide a playback method for an audio device that can output pre-stored background noise during a search, prevent the background noise from being interrupted, and eliminate unnaturalness between songs. It is to provide.

Means for Solving the Problems> In the present invention, the above problems are solved by providing a means for identifying whether a song was recorded live, a means for performing fade-in processing in the background noise section preceding the song, and a means for performing fade-in processing in the background noise section that precedes the song, and a method for identifying whether the song was recorded live. This is achieved by means of fade-out processing in the background noise section. In addition to the above means, there is a means for storing background noise in advance, a means for determining whether background noise exists after the currently played song and before the next played song, and background noise exists for each of them. In some cases, this is accomplished by means of reproducing and outputting background noise stored in memory while searching for the next song to be played.

Based on the recording level between songs, it is possible to identify whether a song was recorded live or not, and if the song is recorded live, fade-in is performed in the background noise section prior to one song during program play or random play. The volume is gradually increased through processing, and the volume is gradually decreased through fade-out processing in the background noise section after the song ends.

In addition, it is possible to check and memorize whether there is background noise before or after the recorded song, and also to store the background noise digitally in memory in advance, so that it can be used for program play or random play when playing the currently playing song. It is determined whether background noise is present after and before the next reproduced song, and if background noise is present in each, the background noise stored in the memory is reproduced and outputted while searching for the next reproduced song.

<Embodiment> FIG. 1 is a block diagram of the main parts of a CD player that implements the reproduction method according to the present invention.

1 is a compact disc, 2 is an optical pickup, 3 is an RF amplifier, 4 is a signal processing unit (data processor for signal processing), 5 is a system controller configured with a microcomputer,
6 is a fade control unit, 7 is a DA converter, 8 is a servo circuit, 9 is an operation panel, 11 is a feed motor that moves the pickup, and 12 is a spindle motor that rotates the CD at a constant circumferential speed.

TOC information is recorded in the lead-in area of compact disc 1, and PCM information is recorded in the program area outside of that.
Along with the audio data being recorded.

A frame synchronization signal and subcode are recorded for each predetermined number of data. The subcode Q channel contains (i) the song number according to the current position of the pickup;

(ii) Information on how many minutes and seconds (time information) and what frame the pickup is located from the beginning of the song number, and (listening)
Absolute time information etc. from the initial position of the pickup are recorded. Further, in the lead-in area of the CD, the total playing time Tt, the first and last song numbers, the beginning time information of the winding song, the playing time information of each station, etc. are recorded.

The pickup 2 optically reads the digital information recorded on the compact disc 1 and sends it to the R and F amplifiers 3.
．． The signal is input to the digital processor 4 via a waveform shaping circuit (not shown).

The digital processor 4 inputs the TOC information to the system controller 5, separates the subcode and PCM audio data from the digital data, inputs the subcode to the system controller 5, and performs error detection/correction processing on the PCM audio data. and input it to the fade control section 6.

The system controller 5 consists of a computer and an icon.

(1) Store TOC information in the built-in memory 5a, (2) Store the song number based on the subcode Q channel data,
You can check the elapsed time for each song, the total elapsed time, etc. on the operation panel 8.
(3) Programs input from the operation panel (
access (search) based on performance order) and TOC information
Perform processing etc. and perform.

(4) In response to a random play request, the performance order is randomly determined based on a random number table, and the performance is performed by performing a search process based on the performance order and TOC information. and later check if there is background noise,
It stores the presence or absence of the background noise in the built-in memory 5a, and (6) executes control according to key operations, various servo controls, etc.

During program play or random play, if there is background noise before the song to be played, the fade control section 6 performs fade-in processing in the background noise section to gradually increase the volume, and after the trip, the background noise is removed. If there is, fade-out processing is performed in the background noise section to gradually reduce the volume. Note that the fade control process may be executed by the digital processor 4.

The servo circuit 8 is a well-known tracking servo.

Performs focus servo, CLV control to keep linear velocity constant, pickup feed control, etc.

FIG. 2 is a flowchart of the playback process of the present invention in the case of random play, and FIG. 3 is an explanatory diagram of the present invention, and the overall operation of FIG. 1 will be explained below in accordance with these diagrams.

When a predetermined key on the operation panel 9 is operated to request random play (step 101), the system controller 5 determines the performance order of the random play (step 102), and also adjusts the background noise at the beginning and end of the winding song. Determine the presence or absence and store it in the built-in memory 5a (Step 1
03), the presence or absence of background noise before a song can be identified by checking the recording level before a predetermined time T of the time information Ms (see Figure 8) indicating the beginning of several songs; The presence or absence of background noise can be identified by checking the recording level after a predetermined time T of time information Me (see FIG. 8) indicating the end of several songs.

Next, set engineering → i and search for the i-th song, and when the search is completed (step ↓04.105)
, refer to the stored contents of the memory 5a and check whether background noise exists at the beginning of the i-th song (step 106).
, if background noise does not exist, fade control is not performed; if background noise exists, it instructs the fade control section 6 to perform fade-in processing, and causes the fade control section 6 to perform fade control.
Then, the PCM audio data of the j-th song manually inputted is subjected to Tc fade-in processing for a predetermined period of time, and the volume is gradually increased (FIG. 3(b), step 107).

After that, 1 normal playback processing is performed (step 10).
8), the playback was performed from the end of several songs until the predetermined time Tc, but check step 1゜9), the predetermined time Tc
When the previous playback is completed, check whether there is background noise after the i-th song (step 110); if there is no background noise, continue playback until the end of the i-th song (step 111). 112), if background noise is present, instructs the fade control unit 6 to execute fade-out processing;
The fade control section causes the PCM audio data of the i-th song inputted from the data processor 4 to undergo Tc fade-out processing for a predetermined period of time, thereby gradually reducing the volume (steps 113 and 114).

Thereafter, it is checked whether the playback of all songs has been completed (step 115), and if it has been, the random play process is finished.

However, if the process has not been completed, i is incremented by i+1→i (step 116), and the processes from step 05 onwards are repeated.

As a result of the above, as shown in FIG. 3(b), the background noise before and after the song gradually increases and decreases, so the background noise does not suddenly stop or occur, and the unnaturalness between songs is reduced. I can do it. Incidentally, FIG. 3(a) shows the conventional case, in which background noise suddenly cuts off or occurs.

In the above, check and memorize in advance whether there is background noise before or after each recording. 7. If there is background noise before the song you are trying to play during program play or random play, check if there is background noise before and after each recording. This is a case where the background noise section performs fade-in processing to gradually increase the volume, and if there is background noise after several songs, the background noise section performs fade-out processing to gradually decrease the volume. However, with live recordings, there is often background noise before and after every song, so
If background noise is detected in one place, it is determined that the recording medium is a live recording disc, and thereafter, the volume is unconditionally faded in for a predetermined time at the beginning of each episode, and the volume is gradually increased, and from a predetermined time before the end of each episode. It can also be configured to perform fade-out processing to gradually reduce the volume.

Further, although the above example is a case in which fade-in and fade-out processing is performed before and after a song, a configuration may also be adopted in which separately prepared background noise is reproduced and output during a search.

FIG. 4 is a block diagram of a CD player in which background noise previously stored in a memory is inserted into a search, and the same parts as in FIG. 1 are given the same reference numerals. The system controller 5 checks and stores whether background noise exists before and after each recording, and also stores the recording level of the background noise at the beginning of one song in the built-in memory 5a.

21 is a background noise memory that digitally stores two channels of background noise for a predetermined period of time (for example, several seconds), and this memory includes background noise that is often heard at live performances, such as applause, cheers, and murmurs. I'll keep it. These background noises are so similar that they are almost indistinguishable from each other when they are concert recordings of similar genres, so by replacing the silence during the search with a sound, the silence is eliminated and the song becomes as if it were a new song. The idea is to play it back as if it were a separate concert performed in sequence.

22 is a readout control unit; 23 is an attenuation control unit (attenuator) that attenuates the background noise read from the memory 21 based on the background noise level before the start of the song; 24 is a fade-in to the background noise data read from the memory; a second fade control unit that performs fade-out processing and outputs;
25 is number I.

This is a synthesizing section that adds (synthesizes) the outputs of the second fade control section 6.24 and outputs the result to the DA converter 7 at the subsequent stage.

Incidentally, the data processor 4, the fade control section 6, the background noise memory 21, the readout control section 22, the attenuation control section 23, the fade control section 241 and the synthesis section 25 can also be integrally configured by a microcomputer.

FIG. 5 is a flowchart of the playback process of the present invention in the case of random play, and FIG. 6 is an explanatory diagram thereof, and the overall operation of FIG. 4 will be explained below in accordance with these diagrams.

When a predetermined key on the operation panel 9 is operated to request random play (step 201), the system controller 5 determines the performance order of the random play (step 202), and also adjusts the background noise at the beginning and end of the multi-song. The presence or absence of the song is checked, and the recording level at the beginning of the multiple songs is checked, and these are stored in the built-in memory 5a (step 203).

Next, as 1 → i, a search is performed for the i-th song, and when the search is completed, playback is started (step 2
04-206).

Next, it is checked whether the i-th song is the last song to be performed (step 207), and if it is the last song, the playback is continued, and the random play process is ended when the performance ends (step 208).

On the other hand, if it is not the last song, it is determined whether background noise exists after the i-th song currently being played by referring to the stored contents of the memory 5a, and whether there is background noise after the i-th song currently being played and whether the next (i + 1)th song is to be played. Check if there is background noise before step 209,2
10) If it does not exist, playback continues until the end of the i-th song. The process continues (steps 211 and 212).

However, if there is background noise after the i-th song and before the next (i+1)-th song, then the end of the i-th song M
e (see FIG. 6) to judge whether the predetermined time Tc has reached before (step 213); if not, repeat the reproduction process (step 214).

However, if it has been reached, the system controller 5
The readout control unit 22 causes the background noise to be read out from the memory 21. Also, calculate the ratio (=R2/R1) of the background noise recording level R1 (known) stored in the memory 21 and the background noise level R2 recorded before the next song,
The numerical ratio is input to the attenuation control unit 23 to attenuate the background noise level read out from the memory, and the second fade control unit 2
4 outputs a command to execute the feto-in process, performs the fade-in process on the attenuated background noise, and displays the processing result (6th
(see Figure cc)) is input to the synthesis unit 25.

Further, the system controller 5 instructs the fade control unit 6 to execute the fade-out process, performs the Tc fade-out process for a predetermined period of time on the PCM audio data of the i-th song inputted from the data processor 4, and displays the processing result (6th (see figure (b))) is input to the synthesis unit 25.

The synthesis unit 25 adds the digital data of each fade control unit 6.24, and sends the addition result (see FIG. 6(d)) to the next stage D.
The background noise is input to the A converter 7 and output from the speaker (step 2 and step 5).

Incidentally, FIG. 6(a) shows the conventional case, and there is no sound during the search.

Thereafter, the process of step 215 is performed until the end of the i-th song (step 216).

When the i-th song ends, i is incremented by i+]→i (step 217), a search is made for the first station, and when the search is completed, it is checked whether fade control is necessary (steps 218 to 220). ), , step 209
, 210, after the i-th song and after the next (i-th song
+1) If background noise also exists before the song, fade control is necessary.

If fade control is required, use system controller 5.
outputs a command to execute the fade-out process to the second fade control unit 24, causes the background noise attenuated by the attenuation control unit 23 to undergo the fade-out process, and displays the processing result (see FIG. 6).
(see C)) is input to the synthesis unit 25. Further, the system controller 5 instructs the fade control unit 6 to execute fade-in processing, and the i-th input from the data processor 4
Tc fade-in processing is performed on the PCM audio data of the song No. 1] for a predetermined period of time, and the processing result (see FIG. 6(b)) is input to the synthesis section 25. The synthesis unit 25 adds the digital data of each fade control unit 6.24, inputs the addition result (see FIG. 6(d)) to the next-stage DA converter 7, and outputs the background noise from the speaker (step 221).

Thereafter, a reproduction process is performed (step 222), and the process jumps to step 207 and repeats the subsequent processes.

In addition, in the above, background noise is checked and memorized before and after each recording, and during program play or random play, the separately stored background noise is played back and output during the search. However, if it is a live recording disc, there is usually background noise before and after every song, so if background noise is detected in one place, it is determined that the recording medium is a live recording disc. It is also possible to configure the system so that the background noise is subsequently read out from the memory and inserted during the search unconditionally.

Further, in the above description, the background noise stored in the memory is subjected to fade-in and fade-out processing, but it is not necessary to carry out these processes.

Furthermore, although the case where the present invention is applied to random play has been described in 1 and above, it can also be applied to programmed play and the like.

Furthermore, although the above example is a case where one type of background noise is stored, it is possible to store background noises according to genres such as rock, classical music, enka, etc., and insert the background noise by specifying the genre. Good too.

<Effects of the Invention> Therefore, according to the present invention, the background noise is configured to be gradually increased by performing fade-in processing before a song, and gradually decreased by performing fade-out processing after the song. Furthermore, according to the present invention, since the background noise stored in advance is output during the search to prevent the background noise from being interrupted, the unnaturalness between songs can be eliminated. can eliminate

[Brief explanation of drawings]

FIG. 1 is a block diagram of a CD player that implements the playback method of the present invention. FIG. 2 is a flowchart of the playback process. FIG. 3 is an explanatory diagram of reproduction processing. Figure 4 is a block diagram of a CD player that executes another playback method of the present invention, Figure 5 is a flowchart of another playback process, Figure 6 is an explanatory diagram of another playback process, and Figure 7 is a diagram of studio recording. Fig. 8 is an explanatory diagram of live recording, and Fig. 9 is an explanatory diagram of conventional problems. 5...System controller 6...Fade control unit 21...Background noise memory 23...Attenuation control unit 24...Second fade control unit 25...Composition unit

Claims (5)

[Claims] (1) Identifies whether the recording medium was recorded live based on the recording level between songs, and in the case of a recording medium recorded live, performs fade-in processing on the background noise preceding the song during program play or random play. A playback method for an audio device, characterized in that the volume is gradually increased by performing fade-out processing in the background noise section after the end of the song, and the volume is gradually decreased. (2) Check and memorize whether there is background noise before or after each recorded song, and if there is background noise before the song you are trying to play during program play or random play, check the A playback method for an audio device, characterized in that a background noise section performs fade-in processing to gradually increase the volume, and if there is background noise after the song, the background noise section performs a fade-out processing and gradually decreases the volume. (3) The background noise is digitally stored in memory in advance, and based on the recording level between songs, it is determined whether the recording medium is live recording or not. If the recording medium is live recording, program play or random A playback method for an audio device, characterized in that during playback, background noise stored in a memory is played back and outputted while searching for the next song to be played. (4) Check and memorize whether there is background noise before or after each recorded song, and also store the background noise digitally in memory in advance so that when playing program play or random play, Determine whether background noise exists after the next playback song and before the next playback song, and if background noise exists for each, play back and output the background noise stored in memory while searching for the next playback song. A playback method for an audio device featuring: (5) Fade out the background noise after the currently played song, fade in the background noise stored in the memory, fade in the background noise before the next song, and save the background noise to the memory. A reproduction method for an audio device according to claim 3 or claim 4, characterized in that stored background noise is subjected to fade-out processing.