JPS626478A - 'karaoke' reproducing device - Google Patents

Abstract

PURPOSE:To easily add an automatic discriminating function for discriminating a tape for appreciation from a 'KARAOKE' (recorded instrumental accompaniment) tape and a lyric displaying function to the titled device by receiving a lyric display signal outputted from a detecting means and displaying lyrics. CONSTITUTION:When a magnetic tape R is a 'KARAOKE' tape, the detecting means M2 connected to a speaker connecting terminal T0 of a reproducing means M1 detects that a speaker output signal outputted from an output terminal T0 is a lyric signal and then outputs the 1st detecting signal. The detecting means M2 detects the operating state of the reproducing device M1 and generates the 2nd detecting signal. Receiving the 1st detecting signal, a display means M3 displays lyrics reproduced by the reproducing means M1 on the screen of a display device, and at the reception of the 2nd detecting signal, erases the display of the lyrics from the screen. A switching means M4 can switch performance reproduced by the reproducing means M1 to stereo reproducing or monaural reproducing, and at the input of the 1st detecting signal, switches the stereo reproducing to the monaural reproducing. An amplifying means M5 amplifies an arithmetic signal and outputs the amplified signal to a speaker S.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a karaoke tape playback device.

[Conventional technology]

In recent years, as the above-mentioned playback device, one has been proposed that displays lyrics corresponding to karaoke performance on a display, which is extremely convenient to use because it does not require searching or storing a collection of lyrics. In this type of device that uses magnetic tape, a karaoke performance and corresponding lyrics are recorded on parallel tracks of the magnetic tape, and when the tape is played back, the lyrics are simultaneously read out and displayed along with the performance.

[Problem that the invention seeks to solve]

By the way, in the above-mentioned apparatus using magnetic tape, the present inventors have proposed that the magnetic tape to be played back may be an ordinary stereo-recorded appreciation tape or a karaoke performance tape, as shown in Japanese Patent Application No. 59-233995. We are proposing a device that automatically determines whether a karaoke tape has recorded lyrics and displays the lyrics if it is a karaoke tape.

However, since this device distinguishes between karaoke tapes and viewing tapes within the playback device, a dedicated playback device is required when using karaoke. Therefore,
If you are using a so-called car stereo designed exclusively for listening to tapes and wish to have the lyrics display function as described above,
You must replace your current car stereo with a playback device that has the automatic discrimination function described above. Therefore, there is a problem in that a very large economic burden is placed on the user.

The present invention can be applied to car stereos that do not have the function of automatically distinguishing between listening tapes and karaoke tapes and the function of displaying lyrics.
This was done in order to provide a karaoke playback device to which two new functions can be easily added.

[Means for solving problems]

Therefore, the present invention provides a karaoke playback device that distinguishes between a music magnetic tape in which performances are recorded on all of the plurality of tracks and a karaoke magnetic tape in which lyrics are recorded in a specific trunk among the plurality of trunks. a reproduction means for reproducing signals recorded on a plurality of tracks including the specific trunk, and a speaker connected to an output terminal for connecting an external speaker provided on the reproduction means and output from the reproduction means. a detection means for detecting whether the signal recorded on the specific track is a lyrics signal from an output signal and outputting a lyrics display signal for detecting that the signal is a lyrics signal; and a lyrics display signal output from the detection means. In response to this, a technical means is adopted that includes a lyrics display means for displaying lyrics.

[Effect]

By adopting the above technical means, when the magnetic tape is a normal stereo-recorded viewing tape, the playback means outputs a speaker output signal from the output terminal according to the recorded performance signal, and Since the speaker vibrates, the user can enjoy stereo music.

On the other hand, if the magnetic tape is a karaoke tape, a lyrics signal is recorded on a specific track, and therefore, this lyrics signal is included in the speaker output signal output from the reproducing means. When this lyrics signal is detected by the detection means, the lyrics display means is activated and the lyrics are displayed without outputting this signal to the speaker. Therefore, the user can visually check the lyrics along with the karaoke playing from the speaker,
It becomes possible to sing.

〔Example〕

Next, the present invention will be explained in detail based on embodiments shown in the drawings.

FIG. 1 shows the configuration of a first embodiment of the present invention. Lyrics and performances recorded on predetermined tracks of the magnetic tape R are reproduced into electrical signals by a reproduction device M1 such as a cassette deck. Terminal T for connecting the speaker of the reproduction means M. When the magnetic tape R is a karaoke tape, the detection means M2 connected to the magnetic tape R outputs a first detection signal when it detects that the speaker output signal outputted from the output terminal T0 is a lyrics signal. Further, the detection means M2 detects the FF, REW, and EJECT operating states of the playback device M1 and issues a second detection signal.

Upon receiving the first detection signal, the display means M displays the lyrics reproduced by the reproduction means on the screen of the display device, and upon receiving the second detection signal, cancels the display of the lyrics on the screen. - The switching means M4 can switch the performance reproduced by the reproduction means M1 to stereo reproduction or monaural reproduction, and when the above-mentioned first detection signal is input,
Switch stereo playback to monaural playback. amplification means M,
amplifies the calculated signal and outputs it to the speaker S.

According to the playback device of the first embodiment, a lyrics display karaoke system can be constructed by simply adding the playback device of the present invention to a playback device such as a commercially available stereo deck.

Figure 2 shows a more specific version of the configuration in Figure 1,
The detection means M2 is provided with input terminals T and R for connecting to the right channel of the output terminal To of the reproducing device, and an input terminal TiL for connecting to the left channel.

Here, the input terminals 'ri, I, and TiL are equipped with a transformer 10 for converting the speaker output into a signal based on the ground in order to correspond to the BTL output of a commercially available playback device.
．． 1) is provided.

Here, the lyrics are recorded on the entire right track of the magnetic tape and input into the right channel (R). The performance is recorded on the left track of the magnetic tape and input to the left channel (L). The lyrics signal input to the right channel is received by the transformer 10, and then sent to the cassette interface 20 as an Sl signal to the CPU 21, which is the central processing unit of the microcomputer shown in FIG.
Input via . Further, this Sl signal is input to the karaoke tape determination circuit 19 together with the S2 signal which receives the calculation signal input to the left channel through a transformer.

The karaoke tape discrimination circuit I9 passes the left and right channel signals S++Sz through band pass filters -19, respectively.
A peak hold signal 192.degree.

In addition, the above 81 signal is the FF (REW) signal, the EJEC
The T signal is input to the non-reproduced signal detection circuit 12. This signal detection circuit 12 has an amplifier circuit 120 and a peak hold circuit 121, and this circuit allows FF (R
EW) signal and EJECT signal are output, the former being input to the CPU 21 in order to eliminate the screen display on the display, and the latter being input to the stereo/karaoke switching control circuit 13 of the switching means M4. ing. In this way, the sensing means M2 detects the transformer 10,1). Judgment circuit 1
The non-reproduced signal detection circuit 12 includes one non-reproduced signal detection circuit 12.

In the control circuit 13, when the EJECT signal is not detected, a flip-flop is set by the output of the karaoke tape determination circuit 19.

This output turns the relay ON and OFF and switches the switch.
Switch the notches 14a and 14b. The code 15°16 is
The amplifier outputs the signal to speakers 17 and 18.

FIG. 3 shows a specific hardware configuration of the display means M3.

In this embodiment, since the dot matrix display tube 24 is used as the display device, it is necessary to turn on the dot matrix display tube 24. For this reason, the microcomputer 2 uses the CPU 21
．． In addition to the memory 22, a latch 23 is provided to hold one character of data output from the CPU 21 to the dot matrix display tube 24.

Next, the operation of the first embodiment having the above configuration will be explained.

The lyrics signal recorded on the magnetic tape is reproduced by a reproduction device M.

is input into the right channel (R) of FIG. 2, and is converted into a signal S by a transformer IO.

Here, when the lyrics signal is input to the 81 signal, the C
The PU2 I converts the signal converted into a digital signal by the cassette interface 20 into an ASClr that corresponds one-to-one with the lyrics, and stores it in the memory 22, while transmitting the lyrics to be displayed to the dot matrix display tube via the latch 23. Displayed on 24. Here, cp, uzi are FF
When the signal is received, the data loaded on the display tube 24 is erased and the display screen is cleared. In this embodiment, this processing was performed by software. Also, if the S1 signal is a lyrics signal, it is a specific frequency signal, so this S1 signal passes through a bandpass filter 191 in the determination circuit 19. , the voltage level peak held by the peak hold circuit 193 is:
Filter 190. 8 by the peak hold circuit 193
The voltage level is adjusted higher than the voltage level obtained by similarly processing two signals.

Therefore, the outputs of the differential amplifier 194 and the comparator 195 are never inverted from "H".

Therefore, the NOR gate 130 of the switching control circuit 13 is
An L'' level signal is output from the output terminal Q of the flip-flop 131, and the switch 14a is in an open state and the switch 14b is in a closed state. Therefore, the S1 signal is not output to the amplifier 15, and the s2 signal
The signals are output to amplifiers 15 and 16, resulting in monaural reproduction.

However, if the signal 31 is not a lyrics signal but a normal music signal, the output voltages of the peak holds 192 and 193 become higher or lower. Therefore, each time the output of the differential amplifier 194 crosses zero, the output of the comparator 195 changes. This output is
When the state changes from "I(" to "L"), the outputs of the comparators 122 and 123 are "L" (details will be described later) during tape playback, so the NOR gate 130 of the stereo karaoke switching control circuit 13 becomes “H” level,
Cent flip flops. For this reason, relay 14
a is oN, zb is 0FFL, S, the signal is output to the speaker 17 via the amplifier 15, the s2 signal is output to the speaker 18 via the amplifier 16, and the reproduction system is stereo.

Here, the amplifiers 15 and 16 prevent the speakers 17 and 18 from acting as microphones and influencing the signals by a factor of Sr and Sz.

Next, the operation of the signal detection circuit I2 will be explained in detail.

When the above-mentioned S signal is input to the double signal signal detection circuit 12, this circuit 12 receives the 81 signal by the amplification circuit 120.
Amplify approximately 10' times. This voltage is represented as 4 in FIG. The voltage V^ is converted by the peak hold circuit 121 into a DC voltage level (2) as shown in FIG. This DC voltage level VD and comparison voltages V+ and Vz are compared by comparators 122 and 123, respectively. Here, V
l.

2 is a voltage corresponding to the operation of the FF (REW) button, which corresponds to tape fast forwarding and rewinding operations of the playback device, and a voltage corresponding to operation of the EJECT button, which corresponds to the tape ejection operation, respectively.

The operation of the circuit 12 when these buttons are pressed will be explained with reference to FIG. During magnetic tape playback, since the continuous lyrics signal S1 is input to the right channel R,
Since the voltages ■ and ■ are always held at a higher voltage level than ■ and ■2, the comparators 122 and 123 are “
"L" level is output.Here, when the FF button is pressed, the level of voltage 2 is the peak hold circuit 121.
decreases according to the discharge time constant of And the voltage ■.

When becomes lower than the comparison voltage ■1, the comparator 122
The output of is reversed to "H" level, and it can be detected that the FF button has been pressed. The response time can be adjusted by the discharge time constant at this time.

The “H” level output signal of the comparator 122 is F
The F signal is input to the CPR 21 of the microcomputer 2, the CPU outputs a command to stop displaying lyrics to the latch 23, and the display device 241 stops displaying lyrics.

Next, when the EJECT button is pressed, the voltage ■ becomes lower than the comparison voltage V2, and the output of the comparator 123 becomes “1”.
)” level, and it can be detected that the EJECT button has been pressed.

The voltages V and V2 were provided with appropriate hysteresis due to waveform fluctuations of the voltage V. The output of the comparator 123 is input to the reset terminal R of the flip-flop 130 of the stereo karaoke switching control circuit 13, and the EJEC
When in the T state, this flip-flop is reset to open switch 14a and close switch 14b. That is, the sI multiplied signal is not output to the amplifier 15, but the s2 signal is output to the amplifiers 15 and 16, resulting in monaural reproduction.

Next, a second embodiment of the present invention will be described.

In the first embodiment, a commercially available playback device (car stereo)
The FF (REW) EJECT is now detected from the speaker output terminal. In the second embodiment, the above signal is detected from the power input terminal.

FIG. 5 shows the hardware configuration of the second embodiment. The difference from FIG. 2 is that the FF (REW) and EJECT detection circuit 30 is used to detect the current consumption flowing to the power input terminal, and the karaoke tape discrimination circuit 19 is eliminated, and this circuit is substituted by the CPU 21. , and the result was output as a D signal to the stereo karaoke switching circuit.

As a result, the following three points were advantageous compared to Example 1.

(1) There is no need to output the output of a commercially available playback device (car stereo) to a speaker via a carrier amplifier.

(2) When installed in a car, alternator noise etc. will not be transferred to the signal line and reproduced as noise from the speaker.

(3) Stereo karaoke can be determined regardless of the recording level of the left and right tracks of the magnetic tape.

For power input of a commercially available playback device (car stereo), after inputting the battery voltage to VCC (IN), the current detection circuit 300
Output VCC (OUT) via With this configuration, the current consumption of the commercially available playback device can be converted into voltage by the current detection circuit 300. This circuit consists of a resistor R
The configuration was designed to differentially amplify the voltage applied to both ends of the . The value of this resistance R is set to 0.00000, which does not affect commercially available playback devices.
It was set to 47Ω.

By the way, most commercially available playback devices have a structure in which the output amplifier is turned off in the EJECT state. Therefore, when EJECT is performed, current consumption decreases.

Furthermore, in the FF state, current consumption is similarly reduced due to reduction in motor load and the like.

However, in this case, since no significant change is observed in EJECT, it may be necessary to increase the gain of the current detection circuit.

Now, the output of the current detection circuit 300 is the output of the comparator 30
1,302 will be man-powered. The comparison voltages V, ', V2' of these comparators are FF(REW), EJ, respectively.
It is set to correspond to ECT. That is, when the FF or REW button is pressed, the output waveform VC of the current detection circuit 300 crosses Vl' and decreases, as shown in FIG.

At this time, the output of comparator 3 (1) changes from “L” to “
H”. When the EJECT button is pressed again,
The waveform at the 0 point crosses 2' and decreases. At this time, the output of the comparator 302 is inverted from "L" to "H". These outputs, namely the FF (REW) signal and the EJECT signal, cause the switching side i[1 circuit 13 and CPU 21) performs the same operation as in the first embodiment.

However, in the first embodiment, the signal that sets the flip-flop 131 of the stereo karaoke switching control circuit 13 is determined based on the speaker output level, but in the second embodiment, the CPU 21 shown in FIG. This is done by making a determination according to the flowchart below, outputting the result as a D signal, and setting the above-mentioned flip-flop.

FIG. 7 shows a flowchart for determining stereo karaoke. In the first embodiment, this part was dependent on the stereo karaoke discrimination circuit 19. Further, the hardware configuration of the display device of Example 2 is shown in FIG.

The CPU 21 checks the input from the magnetic tape, that is, the S signal. When the CPU 21 receives the first 81 signal input, it is determined in step 200, and the process proceeds to step 201, where it determines whether the force at which the timer has started is Flang-1. If the flag is not 1, the process proceeds to step 202 and sets a 2 second timer indicating the karaoke stereo determination time, and step 203
Go to and set the timer start flag to 1. From this moment on, check whether the S signal continues 20 times in a row until 2 seconds have passed.204, 205, 206
As shown in FIG. 2, the CPU 21 monitors the tape, and if it continues 20 times in a row, it determines that it is a karaoke tape, and outputs the D signal by setting it to the "H" level. If not, it is determined that it is a normal music tape, and the D signal is set to the "L" level and output.

FIG. 9 shows a calculation signal track 40 of a karaoke tape 40.
0 and the signal recorded on the lyric signal track 401 is shown. The calculated signal is recorded in the shaded area 400a. Correspondingly, the lyrics signals 401a, 40
1b, . . . are divided and recorded at appropriate timings. During this period, the signal 4 that does not affect the lyrics signal is
02a, 402b, .

In this embodiment, lyrics signals 401a and 401b.

. . . always starts with “1”, so “0” was recorded as the signals 402a, 402b, . . . that do not affect the lyrics signal. The data format used is the generally known one-wave Kansas system.

Here, one lyrics signal (for example, 401a) is 0.5 seconds at most in this embodiment. For this reason, it was decided to set the timer for determining the crab-oké stereo shown in FIG. 7 to 2 seconds. This value of 2 seconds is appropriately determined depending on conditions such as the lyrics signal, the time required for the tape running motor to stabilize, or the time relative to the unrecorded portion of the magnetic tape.

In the second embodiment, the FF (REW) detection is obtained from the change in current consumption, but this FF (REW) detection is
The PU 21 may act as an agent. That is, the control plug is designed to determine that the FF or REW button has been pressed if there is no tape input (S, signal) for one second.

In that case, FF 1. REW) button operation and PLA
It is advantageous if there is not much difference in current consumption between the Y travel and the comparator 302.

In addition, when playing back an unrecorded tape, the flip-flop 131 maintains its output in order to generate an FF signal.
There is an advantage that the karaoke tape judgment can be postponed.

[Effects of the Invention] As described above, according to the present invention, a playback device such as a commercially available stereo tape deck can automatically distinguish between a music listening tape and a karaoke tape, and in the case of a karaoke tape, This has the effect that a function for displaying lyrics can be easily added.

[Brief explanation of the drawing]

1 is a block diagram showing a schematic configuration of a first embodiment of the present invention, FIG. 2 is an electric circuit diagram of the main parts shown in FIG. 1, and FIG. 3 is a display means shown in FIG. 1. 4 is a voltage waveform diagram of the electric circuit diagram shown in FIG. 2, FIG. 5 is an electric circuit diagram of the main part of the second embodiment of the present invention, and FIG. FIG. 10 is a block diagram showing a schematic configuration of a display means in a second embodiment of the invention, and FIG. 10 is an explanatory diagram of the configuration of a magnetic tape according to the invention. T8R...Right channel input terminal I TiL...Left channel input terminal, 12.19...Karaoke tape determination circuit, 12...Non-reproduction signal detection circuit, 13...
Stereo/karaoke switching control circuit, 15.16...
Amplifier, 17.18...Speaker.

Claims (1)

[Scope of Claims] (1) A karaoke machine that distinguishes between a magnetic tape for music on which performances are recorded on all of a plurality of tracks and a magnetic tape for karaoke on which lyrics are recorded on a specific track among the plurality of tracks. The playback device includes playback means for playing back signals recorded on a plurality of tracks including the specific track, and a playback device connected to an output terminal for connecting an external speaker provided on the playback means, a detection means for detecting whether the signal recorded on the specific track is a lyrics signal from the output speaker output signal, and outputting a lyrics display signal when it is detected that the signal is a lyrics signal; 1. A karaoke playback device comprising: lyrics display means for receiving a lyrics display signal and displaying lyrics. (3) The detection means is configured to output a lyric display stop signal when detecting from the speaker output signal or the current consumption of the reproduction means that the reproduction means is not in the reproduction state, and the lyrics display means The karaoke playback device according to claim 1, wherein the karaoke playback device is configured to stop displaying lyrics upon receiving the lyrics display stop signal.