JPH08167281A - Cd player with fm teletext receiver - Google Patents

Abstract

PURPOSE: To combine the function of the CD player effectively with the receiver function by recording character codes coincident with character codes of an FM teletext broadcast A in user's bits in a subcode area of a CD and displaying the codes at the same time when audio signals of the broadcast A are being received. CONSTITUTION: Character codes such as ASKII codes coincident with character codes of an FM teletext broadcast A of a different system from the CD-G are recorded to user's bits in a subcode area of a CD 9. With a switch 29 through to a contact (a), a microcomputer 7a is used to receiver the broadcast A, an FM stereo broadcast is sounded from a loudspeaker 4. When a teletext is available, it is displayed on an LCD 8. With the switch 29 thrown to a contact (b), the microcomputer 7a reads character codes on the CD 9 of the CD player side and displays the codes on the LCD 8a and allows an audio output from a D/A converter 17 to be sounded from the loudspeaker 4. Thus, an FM broadcast program is heard, the teletext is viewed, a reproduced music from the CD 9 is enjoyed and character codes are viewed with an inexpensive configuration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of use of FM teletext receivers and compact disc (CD) players, and more particularly to a CD player with an FM teletext receiver. The FM text multiplex broadcasting is to provide various kinds of information by multiplexing digital signals by utilizing a gap between frequency bands of FM radio broadcasting. For example, information such as the weather forecast, news, sports, etc. is 205 lines, 150 lines.
It is provided by a character display device of 5 characters. This is NH recently
DARC, a mobile FM character multiplex system developed by K
This is a service called (Data Radio Channel).

On the other hand, a compact disc is a well-known type in which an analog signal is digitally recorded on a disc having a diameter of 12 cm by an optical means, and at the time of reproduction, the optical disc is contactless to the disc by an optical means for one hour or more. High quality sound can be played. Further, in recent years, a CD player that can reproduce a still image called CD-G (graphic) by using a user bit in a subcode area of a compact disc has been put on the market. CD-
By inputting a still image signal to an existing television, G can enjoy karaoke, picture books, etc. together with the sound of the compact disc.

[0003]

2. Description of the Related Art FIG. 2 is a block diagram of an FM teletext broadcast receiver, and FIG. 3 is a signal spectrum of the FM teletext broadcast receiver shown in FIG. The modulation method of FM character multiplex broadcasting uses phase continuous FSK (Frequency Shift Keying),
This is an LMSK (Level Controlled MSK) system in which the amplitude level of MSK (Minimum Shift Keying) with a modulation index of 0.5 is controlled by the amplitude level of a stereo difference signal (LR). The carrier center frequency is outside the conventional stereo composite and is 76 KHz.

In FIG. 2, a signal having the spectrum shown in FIG. 3 is received via the antenna 0 and guided to the tuner 1 of the FM receiver. One of the outputs of the tuner 1 is input to the stereo matrix demodulator 2, becomes L and R signals, is amplified by the amplifier 3, and is output as sound from the speaker 4. An LMSK modulated wave is extracted from the other output from the tuner 1 through a bandpass filter (BPF) 5 having a center frequency of 76 KHz. After this signal is subjected to MSK demodulation and error correction in the next MSK demodulation and error correction circuit 6, it becomes digital data and is input as data to a microcomputer 7. If the data is a character code, the microcomputer 7 stores the character in the memory (R
The corresponding character is read from the OM) and the liquid crystal display device (L
CD) 8 to display. In this way, the character information can be provided using the existing FM broadcast.

FIG. 4 is a block diagram of a CD player.
In the figure, 9 is a compact disc, in which a music signal converted into a digital signal is finely processed by a laser or the like and is engraved in a pit (hole) state. Reference numeral 10 is an optical pickup for extracting a digital signal from the compact disc 9. 11 is an RF amplifier, 12 is a DSP
(Digital Signal Processor) for performing error correction from the signal obtained from the RF amplifier 11 and efficiently extracting subcode information described below.

Reference numeral 13 is a system control circuit,
When the user presses a key button (not shown), the microcomputer effectively controls the reproduction operation of the CD player and the operation of selecting a favorite station.
A servo circuit 14 controls the rotation of the spindle motor. A spindle motor 15 rotates the compact disc 9 at a constant linear velocity. Reference numeral 16 denotes a digital filter which facilitates the design of an analog pass filter (not shown) in the subsequent stage. Reference numeral 17 is a D / A converter for returning a digital audio signal to an original analog signal. 18 is a liquid crystal device LCD (Liquid Crysta
l Device) is a display panel for displaying the playing time and the number of the song from the start. Reference numeral 19 is an audio terminal. Part 2 surrounded by broken line
Reference numeral 0 is a CD-G reproducing section. The detailed operation of the CD player itself is omitted.

In general, about 3% of the total recordable area of the compact disc 9 can record information other than the music signal, and the information recording area other than the music signal is called a subcode area. There is. The information of the subcode area has 8 bits, P, Q, R, S, T, U, V, W
Is called. Information such as the beginning of a song and the playing time of the song are recorded in P and Q, which are bits for improving the operability of the player.

The CD-G reproducing section 20 records still picture information using the 6 bits of user bits R, S, T, U, V and W in the subcode area. For example, a karaoke function is attached to a CD player. As shown, the subcode output line S output from the DSP 12 is CD-
This CD-G decoder 21 is connected to the G decoder 21.
At 6, the user bits of 6 bits of R, S, T, U, V and W are decoded and temporarily stored in the DRAM (256k) 22. The reason for temporarily storing in the DRAM is that it takes about 205 seconds to form one still image with 6 bits of user bit. After forming one still screen, R, G, B color outputs are input to the NTSC encoder 23, and a video signal as seen in a general TV receiver is output from the video output terminal 24.

[0009]

The above-mentioned FM character multiplex broadcasting and CD-G have the same function of decoding character information and displaying it on the display device, but the FM character multiplex broadcasting and CD-G have the same function. There is no systematic consistency between and. That is, although the functions of displaying characters are the same, they are only functioning independently of each other.

It is an object of the present invention to effectively combine the character information of FM character multiplex broadcasting and the function of a compact disc.
It is to provide a CD player with a teletext receiver.

[0011]

DISCLOSURE OF THE INVENTION The present invention is a CD player with an FM character multiplex broadcast receiver in which an FM character multiplex broadcast receiver and a CD player are combined, which has a character display device built therein and a compact disc (CD). In the user's bit in the sub code area, the character code different from the CD-G and matched with the character code of FM character multiplex broadcasting is recorded, and at the same time as the sound reception of FM character multiplex broadcasting. The character information of the FM character multiplex broadcast recorded on the compact disc is displayed on the character display device.

The user bit includes FM
An ASCII code used for a character code of character multiplex broadcasting is recorded, and the character display device is a dot matrix type liquid crystal display device (LCD) used for an FM character multiplex broadcast receiver.

[0013]

In the FM character multiplex broadcast receiver CD player, 6 bits R, S, T, U, V, which are user bits of the subcode area of the compact disc, are used.
The graphic information recorded on the CD-G is not recorded on the W, and the character code of a method different from that of the CD-G is matched with the character code of the FM character multiplex broadcasting, such as ASCII code. Record the character code.

The dot matrix type L to be used
The size of the CD is equal to or larger than that used in the FM teletext receiver. According to the present invention, a product such as a radio cassette with a CD player has a built-in FM character multiplex broadcast reception function. For example, when there is a karaoke broadcast, lyrics are displayed on the LCD, and a compact disc created at the time of reproduction is used. It can also be used to display lyrics on the same LCD.

[0015]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of a CD player with an FM teletext receiver according to the present invention. The same numbers as those described above in the figure have the same functions. The newly added one is a switch 29 for switching the input of the stereo matrix demodulator 2 to the FM character multiplex receiver side or the CD player side, and a character ROM for controlling both the FM character multiplex receiver and the CD player.
The built-in microcomputer 7a. Further, 8a is a dot matrix type LCD, and can have a display area equal to or larger than that of the LCD 8 described above.

FIG. 5 is an explanatory view of the character display method of the present invention, and is a block diagram for extracting character information from a CD disc. The input terminal 28 is the DSP 12 of the CD player.
It is an input terminal of the sub code area output from. The character decoder 25 extracts a character code from the sub code area. The character generator 26 takes out character information from, for example, a ROM in response to a command from the character decoder 25. LC
D27 is a display device for displaying character information by the output of the character generator 26.

FIG. 5 shows a CD-G reproducing section 20 shown by a broken line in FIG.
It is for comparison with. User bits R, S, T, U in the subcode area of the compact disc 9
Character information (lyrics, etc.) for V and W by a method different from CD-G
Record (coding). When the compact disc 9 thus recorded is reproduced by the CD player, the subcode information obtained from the DSP 12 is guided to the input terminal 28, and the character information is obtained from the bits R, S, T, U, V and W by the character decoder 25. Decrypt at. Character decoder 2
From 5, the character generator 26 issues a command to output a predetermined character on the LCD 27. The LCD 27 is different from the segment drive type LCD 18 explained for the CD player,
For example, a dot matrix type LCD. Therefore, various kinds of characters can be displayed.

The LCD is the L in the FM character multiplex receiver of FIG.
It has the same or better function as CD8. The information rate is different in the combination of only the FM character multiplex receiver and the CD player. That is, comparing the information rates, FM character multiplex broadcasting is 6.8 Kbps, and the user bit of the CD player is 44 Kbps, which is obviously larger than FM character multiplex broadcasting. Therefore, it can be sufficiently matched with FM text multiplex broadcasting. In this way, since there is a difference in the number of bits, even if the lyrics of the music with a fast rhythm cannot be displayed at the information rate of the FM character multiplex broadcasting, the CD player can sufficiently cope with it. If characters (lyrics) can be displayed with such a configuration, it will be displayed on a TV like a CD-G.
You can enjoy karaoke on the LCD screen without connecting a receiver.

The microcomputer 7a of FIG. 1 incorporates the character decoder 25 and the character generator 26 of FIG. When the switch 29 is switched to the contact a side, FM character multiplex broadcasting is received, and the operation is the same as that described with reference to FIG. That is, when there is a character broadcast while listening to the FM stereo broadcast, it can be viewed on the display 8a.

When the switch 29 is on the contact b side, the microcomputer 7a determines that it is in the CD play mode, and operates based on a command from the system control circuit 13 on the CD player side. At this time, as described above, the character code is read from the subcode information output from the DSP 12 via the signal line S and displayed on the display 8a. On the other hand, the audio output output from the D / A converter 17 is output from the speaker 4 via the switch 29. Thus, in the case of FM character multiplex broadcasting, the FM broadcasting can be heard and the characters can be displayed, and when the CD player is reproduced, the reproduced music can be heard and the characters can be displayed.

As is apparent from the embodiment shown in FIG. 1, the same character display device (character ROM, LCD) is obtained by matching the digital coding of the character information recorded on the compact disc 9 and the character information of the FM character multiplex broadcasting. , Character decoder) can be shared. In the first embodiment, the CD player combined with the FM teletext receiver has been described, but as another embodiment, a product of the CD player alone may be used.

FIG. 6 shows an example in which the character code of the present invention can be displayed on the portable CD player 30. In this case, the display unit 31 is of the dot matrix type and can display English or Kana as shown.

[0023]

As described above, according to the CD player with the FM teletext receiver of the present invention, the CD-G
It is possible to enjoy character information by looking at the display device of the CD player without connecting a TV (including a liquid crystal TV) like a player. Further, even when combined with the FM character multiplex receiver, the character code is common, so that it can be constructed at low cost.

[Brief description of drawings]

FIG. 1 is a block diagram of a CD player with an FM teletext broadcast receiver of the present invention.

FIG. 2 is a block diagram of an FM teletext broadcast receiver.

FIG. 3 is a signal spectrum of the FM teletext receiver shown in FIG.

FIG. 4 is a block diagram of a CD player.

FIG. 5 is an explanatory diagram of a character display method of the present invention.

FIG. 6 is an external view of a CD player with a character display function of the present invention.

[Explanation of symbols]

0 ... Antenna 1 ... Tuner 2 ... Stereo matrix demodulator 3 ... Amplifier 4 ... Speaker 5 ... Bandpass filter (BPF) 5 6 ... MSK demodulation and error correction circuit 7, 7a ... Microcomputer 8, 8a, 27 ... Dot matrix system Liquid crystal display (LCD) 9 ... Compact disc 10 ... Optical pickup 11 ... RF amplifier 12 ... DSP 13 ... System control circuit 14 ... Servo circuit 15 ... Spindle motor 16 ... Digital filter 17 ... D / A converter 18 ... Segment drive type LCD 19 ... Audio terminal 20 ... CD-G reproducing section 21 ... CD-G decoder 22 ... DRAM 23 ... NTSC encoder 24 ... Video output terminal 25 ... Character decoder 26 ... Character generator 28 ... Input terminal 29 ... Switch 30 ... CD player 1 ... the display unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location H04N 5/781 7/025 7/03 7/035 H04N 7/08 A 9369-5D G11B 27/34 P

Claims (3)

[Claims] 1. A CD player with an FM character multiplex broadcasting receiver, which is a combination of an FM character multiplex broadcasting receiver and a CD player, having a character display device built-in, and a user disc in a subcode area of a compact disc (CD). In the bit, a character code of a system different from that of CD-G, which is the same as the character code of FM character multiplex broadcasting, is recorded, and is recorded on the compact disc at the same time as the sound reception of FM character multiplex broadcasting. A character player for FM character multiplex broadcasting, wherein character information of FM character multiplex broadcasting is displayed on the character display device. 2. The CD player with FM character multiplex receiver according to claim 1, wherein an ASCII code used for a character code of FM character multiplex broadcasting is recorded in the user bit. 3. The CD player with the FM character multiplex receiver according to claim 1, wherein the character display device is a dot matrix type liquid crystal display (LCD) used in the FM character multiplex receiver.