JPH05258537A - Digital recording device - Google Patents

Abstract

PURPOSE:To facilitate recording while adding a music number automatically by a music interval detection based on the received data by providing an infinity zero detector instead of a level detector. CONSTITUTION:A digital audio interface signal is received and classified by a receiver 1, the digital audio data of this is transformed into a data format to be recorded by a digital recording device 5 and sent. Also, the data of a control bit and the data of a user bit are demodulated and sent to a decoder 2. Whether or not the digital audio data becomes zero data completely is detected by an infinity zero detector 3. The music interval is detected by a logic circuit 4 using a detective signal from the infinity zero detector 3, when a music number changing point signal is received is recognized as the music interval and the respective detective signals are sent to the digital recording device 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital recording apparatus, and more particularly to a digital recording apparatus with a music number increasing function that can automatically increase the music number.

[0002]

2. Description of the Related Art Conventionally, in a digital recording apparatus for receiving a signal based on a digital audio interface format (IEC CP-340) and recording it as audio data, the number of music pieces is increased as shown in FIG. As described above, the amplitude of the audio signal is judged by the absolute value of the digital data received by the digital audio interface signal receiver 1 and obtained by the level detector 6, and in the logic circuit 4, the amplitude level of the audio signal is higher than the preset amplitude level. A signal for increasing the song number is sent to the digital recorder 5 by determining when the low level data exceeds the set level after a predetermined time has elapsed. Further, as shown in FIG. 3, the category code is read from the control bits on the digital audio interface obtained by decoding the signal from the receiver 1 by the control bit and the user bit decoder 2, and in the logic circuit 4, There is also a device for increasing the music number by the music number information put in the user bit.

[0003]

Among the above-mentioned devices, the device shown in FIG. 2 is used when the song number is changed when the song is erroneously detected in the low volume part of the song or the volume number does not change. There was a defect that the interval could not be detected. Further, in the apparatus shown in FIG. 3, it is good when the sending side reproduces in the order of the song numbers, but when the user does not perform the song numbers in the order of the song numbers such as when the user arbitrarily programs the song numbers of the reproduced songs, the songs are changed from song to song. There is a defect that the detection of the music interval malfunctions because an unintended music number detected during the search appears on the data.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a digital recording apparatus for automatically recording and adding a music number by the music interval detection which solves the above-mentioned drawbacks, based on the data received from a digital audio interface. It is in.

[0005]

In order to solve the above-mentioned problems, the digital recording apparatus according to the present invention is such that the audio data of the digital audio interface signal becomes data of infinity zero for a preset time or more, When this data becomes data other than Infinity Zero, the song number is incremented by one. A digital recording apparatus according to another aspect of the present invention decodes a category code and a user bit (U bit) in a control bit (C bit) in a received digital audio interface signal to obtain a digital audio signal.・ Data is Infiniti ・
When it does not become zero, the song number is incremented by 1 according to the information indicating the song number change in the U-bit information of the equipment corresponding to the category code, and the category code is maintained while Infinity Zero of the digital audio data continues. The information indicating the change of the music number in the U-bit information of the equipment corresponding to the above is configured not to increase the music number.

[0006]

According to the present invention, when the audio data is changed from the data of Infinity zero to the data other than Infinity zero for a preset time or more, the song number is incremented by 1, and the digital audio data is When the number does not become Infinity Zero, increase the song number by 1 by the change information of the song number of U-bit information, and do not increase the song number by the change information of song number in U-bit information while Infinity Zero continues. This enables automatic recording of song numbers.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a configuration block diagram showing an embodiment of a digital recording apparatus according to the present invention. In FIG.
1 is a digital audio interface signal receiver, which is an I.D. E. C digital audio interface The signal transmitted in accordance with the IEC-958 standard is synchronously received, and the received signal is received by the digital audio interface.
The data is divided into data, control bit data, and user bit data, and the digital audio data is converted into a data format that can be recorded by the digital recording device 5 and transmitted, and the control bit data and the user bit data are transmitted. It demodulates and sends to the control bit and user bit decoder 2.

The decoder 2 decodes the control bit, discriminates the machine on the transmitting side from the category code contained therein, decodes the user bit, and decodes the tune number or the beginning of the tune from the transmitting side. The signal indicating is taken out. Further, from the control bits, emphasis information and management information (whether or not to copy) corresponding to the serial copy management system (SCMS) are extracted. Infinity
The zero detector 3 detects that the digital audio data is completely zero data, unlike the level detector 6 of FIG. 2 (which logically inverts when the level becomes lower than a preset level).

The logic circuit 4 detects that the detection signal from the infinity zero detector 3 changes after a lapse of a predetermined time or more, and considers that time to be a music interval and sends the detection signal to the digital recorder 5. .. Further, when the signal from the decoder 2 is received and there is no detection signal from the detector 3 and the music number change point signal from the decoder 2 is received, it is considered as a music interval and the detection signal is sent to the digital recorder 5. Even if there is no detection signal from the detector 3 and the music number change signal from the decoder 2 does not arrive, if there is a change in the presence or absence of emphasis and if there is a change from copy-disabled to copy-permitted, it is regarded as a music interval and detected. The signal is sent to the digital recorder 5. The digital recorder 5 records the digital audio data from the receiver 1 and receives the detection signal from the logic circuit 4 to choreograph the music number to the recorded digital audio data.

Next, the operation of the embodiment shown in FIG. 1 will be described. The signal received by the receiver 1 is format-converted into a digital recorder 5 and an infinity zero detector 3
Sent as digital audio data. In a normal music source, S / of the A / D converter of the recorder 5
There is almost no complete digital zero (infinity zero) data even in the so-called silent part between songs due to the effects of N, drift cancellation, servo, dither, etc., and it is the lower number of audio data. Bits are constantly changing. Therefore, in this case, the logic circuit 4 discriminates the interval between the songs by using the signal indicating the head of the song extracted from the receiver 1 by the decoder 2, and informs the digital recorder 5 that the interval is between the songs. Increase the song number by 1 and record.

When the transmitting machine rearranges the song numbers of the recording sources and sends the data to the receiver 1,
Since the machine on the transmitting side searches between songs to find the beginning of the next song, muting operation occurs between songs, and the audio data becomes completely digital zero (infinity zero). I will end up. Therefore, this is detected by the infinity zero detector 3, and the logic circuit 4
The time determination is performed, and when the detection signal of the detector 3 disappears, a signal for increasing the song number by 1 is given to the digital recorder 5. In this case, since the signal indicating the beginning of the music from the decoder 2 is changed based on the data read during the search when the transmitters are searching, it cannot be regarded as the correct inter-track detection information. The logic circuit 4 operates so as to ignore the infinity zero of the detector 3 during detection.

Also, depending on the transmitter, even if the song number is the same, the presence or absence of emphasis changes in the middle or SC.
Since it is assumed that the availability of MS copy may change,
When it is necessary to regard this case as the interval between pieces of music, the change of these information from the decoder 2 is judged by the logic circuit 4 and then 5
The song number is incremented by 1 and recorded. Of course, in this case, it is effective only when the detection signal from the detector 3 is not received, and if the change is the same as the music number signal, the music number change signal is prioritized. If there is no change in the presence or absence of emphasis and whether or not SCMS can be copied within the same tune number, the logic circuit 4 may ignore it. When the sampling frequency (fs) of the audio data of the transmitting side machine changes, the PLL of the data reading clock of the receiver 1 is temporarily deviated, so that the receiver 1 receives the digital recorder 5 and the detector 3. The data sent to will be Infinity Zero this time.
This is detected by the detector 3, the logic circuit 4 regards it as a music interval, and increments the music number of the digital recorder 5 by 1 to record.

In the above embodiment, the detector 3 is an infinity zero detector, but if the receiver 1 is an A / D converter and the detector 3 is the level detector 6 of FIG. It can be used as normal inter-track detection with analog input. Therefore, the detector 3 can be switched between the infinity zero detection and the level detection by the receiver 1 or the A / D converter.

[0014]

As described above, according to the digital recording apparatus of the present invention, it is possible to reliably detect the interval between songs by using the signal information from the DIR, and the accuracy of the automatic song number adding function of the digital audio recorder. Can be improved.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of a digital recording device with a music piece number increasing function according to the present invention.

FIG. 2 is a configuration block diagram of a conventional digital recording device.

FIG. 3 is another block diagram of the configuration of the digital recording apparatus, which is an embodiment in the case of using user bit data.

[Explanation of symbols]

1 receiver 2 decoder 3 infinity zero detector 4 logic circuit 5 digital recorder 6 level detector

Claims (3)

[Claims] 1. The audio data of a digital audio interface signal becomes data of infinity zero for a preset time or more, and when this data becomes data other than infinity zero, the song number is incremented by one. A digital recording device characterized by the above. 2. When the category code and the user bit (U bit) in the control bit (C bit) in the received digital audio interface signal are decoded and the digital audio data does not become Infinity zero. , Increments the song number by 1 by the information indicating the change of the song number in the U-bit information of the equipment corresponding to the category code,
A digital recording device characterized in that information indicating a change in song number in U-bit information of a machine corresponding to a category code does not increase the song number while data infinity zero continues. 3. When the digital audio data does not become infinity zero, when the emphasis information in the C bit changes, or when the copy generation information changes and recording is permitted, the song number is changed. If the digital audio data is increased by one and the infinity is zero, the song number is not increased even if the information changes, and the song number is set to 1 even when the information changes at the same time as the above condition. The digital recording apparatus according to claim 2, wherein the number is increased only by one.