JPH02295400A - Sound field reproducing method in cd player - Google Patents

Abstract

PURPOSE:To reproduce substantial sound field at recording by recording a sound field control data set corresponding to the condition of a listening environment onto a subcode of a CD or the like and adding the sound field component based on the sound control data to a CD player. CONSTITUTION:Sound control data set corresponding to the condition of the listening environment reproducing the sound field component added at reproduction is recorded to an idle bit of a subcode of a CD 1. Moreover, the CD player in use is provided with a head (optical pickup) 2 reading data recorded on the CD 1, an environment setting switch 3, a decoder the readout data, a sub decoder 5 decoding the sound field control data, a digital signal processor 6 applying prescribed processing to a digital signal decoded by the decoder 4, a sound field component output circuit 7 outputting an indirect sound component and echo sound component as the sound field component and an addition circuit 8 adding an output of the sound field component output circuit 7 to the output of the DSP 6. Thus, the sound field is reproduced simply.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sound field reproduction method in a CD player.

[Prior art] The sound in a concert hall consists of direct sound from the stage,
A rich sound is created by synergy with indirect sounds from walls and ceilings. In particular, the primary reflected sound following the direct sound and the 50~
The 80ms of early reflected sound creates a sound field effect unique to that hall, and the subsequent reverberant sound gives a sense of the size of the hall.

By the way, in general, the reproduced sound that an individual listens to in his or her own listening room using an audio device has a poor sound field feel even if the source appropriately contains the sound field components of the performance venue.

Indirect sound and reverberant sound, which are elements of sound field reproduction, are affected by limitations imposed by the various conditions of the listening environment, including limitations due to the space provided as a listening room, limitations due to the number and arrangement of speakers used, etc. This is thought to be due to the lack of sound field components such as .

Therefore, in recent years, in order to compensate for these missing sound field components and enhance the sound field sensation, sound field type speakers, which have a large number of speakers arranged in multiple directions, and electric circuits such as delay circuits have been used for reproduction. A sound field regenerator that modifies the desired sound signal itself (
Research focused on sound field processors, etc., and various devices were developed.

However, up until now, standalone CD players have been developed that take sound field playback into consideration;
It simply played back the sound recorded on the D (compact disc).

Therefore, when trying to reproduce a sound field using a CD player, there is no choice but to rely on the aforementioned sound field type speaker or sound field reproducing device.

[Problems to be Solved by the Invention] However, as mentioned above, the method of using a dedicated sound field type subwoofer or sound field regenerator increases the amount of equipment to be purchased, and is difficult for the user in terms of cost and installation space. The problem is that the burden on

Furthermore, the sound field components of a source recorded on a CD naturally differ depending on the performer or performance venue (recording venue) of the source, and each has its own unique sound field component. However,
With the aforementioned sound field type speakers and sound field regenerators, the addition of sound field components becomes uniform, and this is difficult to achieve the ideal of reproducing the original sound field (unique sound field) at the time of recording for each source. However, there was a problem.

The present invention has been made in view of the above-mentioned circumstances, and enables sound field reproduction without preparing an existing sound field reproducing device, etc., and is advantageous for the user in terms of cost and installation space. The purpose of this invention is to provide a method for reproducing sound fields in a CD player that is capable of reproducing the original sound field during recording for each source.

[Means for Solving the Problems] A CD player according to the present invention;
This is an attempt to reproduce the sound field by improving the functions installed in CDs and CD players.

Specifically, the sub-code of a CD contains information about the listening environment that reproduces the sound field components that should be added during playback, in order to bring the reproduced sound closer to the sound field during the actual performance of the music recorded on the CD. Record the sound field control data set according to the conditions.

On the other hand, the CD player that plays the CD has an environment setting function for selecting listening environment conditions, and a sound field data reading function for reading sound field components corresponding to the selected listening environment conditions from the sound field control data. A sound field component adding function is provided to form a sound signal to which a sound field component is added based on the content read by the sound field data reading function.

The present invention is characterized in that a sound field is reproduced by the reproduction by the CD player.

[Operations] The sound field reproduction method in the CD player according to the present invention is based on C
This system aims to reproduce the sound field by improving the functions installed in D and CD players, and since it is possible to reproduce the sound field without preparing an existing sound field reproducing device, it saves cost and installation space. The burden on the user can also be reduced in this respect.

Furthermore, in the method of the present invention, since sound field control data that sets sound field components to be added during playback is recorded on the CD itself,
Rather than being uniform, the sound field components added to each CD or each song recorded on a CD can be set appropriately, thus reproducing the original sound field (unique sound field) at the time of recording. Suitable for ideals.

In addition, although the sound field feeling generally fluctuates due to changes in the listening environment, the method of the present invention takes into consideration the listening environment to be reproduced in advance and performs additional processing on sound field components, so that the sound field can be reproduced more meaningfully. Various excellent effects can be obtained.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

The method of this embodiment improves the functions installed in a CD and a CD player, and aims at reproducing a sound field simply by reproducing with a CD player.

Specifically, the improved points are as follows.

In the case of this embodiment, sound field control data is recorded in empty bits of the subcode of the CD.

The CD subcode is a part that stores auxiliary information other than music, and includes 8 bits in one frame, and each bit has P, Q, and R as shown in Figure 2.
, S...W. and,
Subcodes with the same name in each frame are collected in order and called P, Q, R, S, . . . , W channels, respectively. In the case of an audio CD, the use of the P channel and Q channel is specified, but the use of the other R-W channels is not specified, and they are used as empty bits for the sound field control. It can be used to record data.

For reference, the P channel is used as a song cue signal, and the Q channel is used to control the number of channels, dubbing M, stop r, presence or absence of emphasis, frame order, track number, index number, playback time (minutes, seconds, number of frames). It is used to display things like.

The sound field control data adjusts the sound field components to be added during playback in accordance with the conditions of the listening environment in which the music is played, in order to bring the playback sound closer to the sound field during the actual performance of the music recorded on the CD. This is the setting.

Here, the sound field components include indirect sound components (echo components) and reverberant sound components (delay components). The degree to which these sound field components are added is set.

Further, the conditions of the listening environment include the size of the listening room and the frequency characteristics of the speaker power used for reproduction.

The size of the listening room is divided into several levels, for example, a 20 tatami room, a 12 tatami room, and a 6 tatami room. This is to ensure that the state of diffusion of the reproduced sound is appropriate. Furthermore, the frequency characteristics of speakers are divided into several types depending on the shape of the frequency characteristic curve. Note that if there is enough bits to be stored as conditions, the distance from the wall of a device such as a speaker, the distance from the device to the listener, etc. may also be included in the conditions of the listening environment.

On the other hand, FIG. 1 shows the configuration of the main parts of the CD player that plays the CD.

That is, the CD player used in one embodiment has a head (light bisok-up) that reads data recorded on the CDI.
2, an environment setting switch 3, a decoder 4 for decoding data read by the head 2, a sub-decoder 5 for decoding the sound field control data, and a digital signal decoded by the decoder 4. a digital signal processor (hereinafter abbreviated as DSP) 6 that performs predetermined processing, and a sound field component output circuit 7 that outputs indirect sound components (echo components) and reverberant sound components (delay components) as sound field components. , an additional circuit 8 that adds the output of the sound field component output circuit 7 to the output of the DSP 6, and a stereo demodulator (hereinafter abbreviated as MPX) that modulates the output of the additional circuit 8 into stereo R and L signals. 9.

The environment setting switch 3 provides an environment setting function for selecting a sound field component that matches one's own listening environment from sound field components for each condition included in the sound field control data of the CDI.

Further, when an environmental condition is selected using the environment setting switch 3, the set value of the sound field component of the selected environmental condition is passed from the decoder 4 to the sub-decoder 5.

That is, the sub-decoder 5 performs a sound field data reading function of reading sound field components corresponding to the conditions of the selected listening environment from the sound field control data.

Further, the output of the sub-decoder 5 controls processing in the DSP 6 and the sound field component output circuit 7.

Further, the adding circuit 8 performs a sound field component adding function of forming a sound signal to which a sound field component is added based on the content read by the sound field data reading function.

Playback using a CD and CD player configured as described above enables sound field playback without the need for an existing sound field playback device, so it is less costly for the user in terms of cost and installation space. The burden can be reduced.

In addition, in the method of the above embodiment, sound field control data that sets sound field components to be added at the time of playback is recorded on the CDI itself, so that the sound field control data is not uniform, but is unique for each CD or for each song recorded within the CD. You can appropriately set the sound field components to be added for each
Therefore, it is suitable for the ideal of reproducing the original sound field (unique sound field) during recording.

In addition, the sound field sensation generally changes depending on changes in the listening environment, but in the method of one embodiment, the sound field components are added in consideration of the listening environment to be reproduced in advance, so that the sound field reproduction can be performed more meaningfully. Various excellent effects can be obtained.

In the above embodiment, the empty pits of the sub-code are used as recording locations for the sound field control data on the CD, but it is also possible to use the 0 track, for example. Therefore, the recording location of the sound field control data is not limited to the sub-code. [Sub code etc. J in the claims is intended to include the above-mentioned 0 track etc.

[Effects of the Invention] As is clear from the above explanation, the sound field reproduction method in a CD player according to the present invention aims at sound field reproduction by improving the functions installed in the CD and the CD player, and is different from the existing one. Since it is possible to reproduce the sound field without preparing a sound field regenerator or the like, the burden on the user can be reduced in terms of cost and installation space.

Furthermore, in the method of the present invention, since sound field control data that sets sound field components to be added during playback is recorded on the CD itself,
Rather than being uniform, the sound field components added to each CD or each song recorded on a CD can be set appropriately, thus reproducing the original sound field (unique sound field) at the time of recording. Suitable for ideals.

In addition, although the sound field feeling generally fluctuates due to changes in the listening environment, the method of the present invention takes into consideration the listening environment to be reproduced in advance and performs additional processing on sound field components, so that the sound field can be reproduced more meaningfully. Various excellent effects can be obtained.

Ru.

1...CD (compact disc), 2...
...Head, 3...Environment setting switch, 4
...Decoder, 5 ...Sub decoder, 6 ...DSP, 7 ...Sound field component output circuit, 8 ...Additional circuit , 9... Stereo demodulator.

Claims (1)

[Claims] The CD subcode, etc. includes a listening environment that reproduces sound field components that should be added during playback in order to bring the reproduced sound closer to the sound field when the music recorded on the CD is actually played. On the other hand, the CD player that plays the CD has an environment setting function to select the listening environment conditions, and a sound field control data set according to the selected listening environment conditions. a sound field data reading function for reading a corresponding sound field component from the sound field control data; and a sound field component addition function for forming a sound signal to which a sound field component is added based on the content read by the sound field data reading function. A sound field reproducing method in a CD player, characterized in that the sound field is reproduced by the reproduction by the CD player.