JPH01128267A - System for reproducing rotary head type tape recorder - Google Patents

Abstract

PURPOSE:To attain an auto fade in (out) action in an optional part at the time of reproduction by recording a signal showing the start point of the auto fade in or fade out action in a sub code area on a tape. CONSTITUTION:At the time of recording, sound inputted to an input terminal 1 is converted 2 into a digital signal and is transmitted to a recording amplifier 6 with a sub code signal generated in a sub code generation circuit 4. The output of the amplifier 6 is recorded on the tape 22 by a recording and reproducing rotary head 8. At the time of reproduction, the sub code signal is extracted from the output of a reproducing amplifier 9 in a sub code processing circuit 13, and the start signal showing the auto fade in and auto fade out action is detected. A control circuit 21 controls an output level from a digital signal processing circuit 10 based on the detected result. Consequently, an original music signal outputted from an output terminal 11 gradually increases or decreases.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a reproduction system for a rotary head type tape recorder.

(B) Conventional technology Conventionally, in a rotary head digital audio tape recorder (R-DAT), information signals such as music converted into digital signals are stored in the center of the trace of each track of a tape that is helically scanned by a rotary head. A recording area for information to be recorded is formed, and a tracking area and a subcode area are formed on both sides of this information recording area, that is, at the trace start and end of each track. In this tracking area, a servo signal for tracking control is recorded, and in the subcode area, the song number, playing time of the song, absolute time, etc. are recorded.

Specifically, the subcode area consists of 16 blocks on one track (one block is 288 bits) as shown in Figure 4.
Currently, in order to improve the functionality of R-DAT, a signal indicating the beginning of a song (Star 1-ID) as well as the song number and time information, as well as narrations and commercials between songs, are skipped and played. It is agreed upon in a unified format to record the signals (skip ID), etc. However, since the recording capacity of such a subcode area is about four times that of a CD, an empty capacity is set in advance so that other unique functions can be added.

e'9 Problems to be Solved by the Invention However, the conventional R-DAT has an automatic function that gradually increases or decreases the playback output level of a music signal once recorded on a tape at an arbitrary point. Because there was no fade-in or auto-fade-out function, sudden rises and falls of the sound occurred at the start and end of a song, recording breaks at the end of the tape, and when the narration was cut by skip ID, causing discomfort to the user. There was a risk of giving.

B) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention forms a subcode area in each track on a tape together with an information recording area in which information signals such as music are recorded, In a rotary head tape recorder that records the song number, playing time, etc. in this subcode area, a start signal indicating the start point of an auto fade-in or auto fade-out operation is recorded in the subcode area, and during playback. When this start signal is detected from the subcode area, the playback output level is automatically gradually increased or decreased from the time of detection to perform an auto-fade-in or auto-fade-out operation. .

(g) Effects In the above-described reproduction system of the present invention, an auto-fade-in or auto-fade-out operation can be performed at any location of the reproduction special number.

(c) Examples An embodiment of the present invention will be described below with reference to the drawings.

That is, according to the present invention, a start signal indicating the start point of auto-fade-in or auto-fade-out operation is recorded in the sub-food area along with track number and time information, and when this start signal is detected from the sub-code area during playback. From the time of detection, the playback output level is automatically gradually increased or decreased to perform an auto-fade-in or auto-fade-out operation. here,
The start signal is recorded in the subcode area at any time when music is recorded, or by dubbing only the subcode area after music is recorded.

FIG. 1 shows a specific system configuration example of the R-DAT used in the present invention, where (1) is an input terminal into which an analog audio signal is input, and (2) is an input terminal for interleaving or time-compressing this audio signal. (3) is a servo signal generation circuit that generates servo signals for tracking control (i.e., pilot signals, sync signals, etc.); (4) is a servo signal generation circuit that converts track numbers and time information,
A subcode generation circuit (5) generates subcode signals such as start signals for auto fade-in and auto-fade out; A switch circuit that is selectively switched at a predetermined timing to record digitally converted audio signals, servo signals, and subcode signals; (6) is a recording amplifier; (7)
is a rotary transformer of a rotating head cylinder that supplies the output from a recording amplifier (6) to two recording/playback rotating heads (8), (9) is a playback amplifier, and 10) is a playback amplifier (
9) A digital signal processing circuit that generates a clock from the data using PL, L, etc., converts it into a digital signal, and then converts it into an analog signal. α1) is the output terminal from which the original analog audio signal is output. be. 02
) is a servo circuit that extracts a servo signal for tracking control from the output of the playback amplifier (9) and generates a tracking error signal, and 03) is a servo circuit that extracts a subcode signal from the output of the playback amplifier (9) and generates an auto-default signal. This is a subcode processing circuit that detects a start signal indicating the start point of add-in and auto-fade-out. The circle is a take-up reel motor that directly drives the take-up reel shaft, (151 is a supply reel motor that directly drives the supply reel shaft, and (16 is
) is its motor drive circuit, αη (18) is the cylinder motor and its motor drive circuit, +19! (20) is a capstan motor and its motor drive circuit. and,
(21) is various operation key manual power and subcode processing circuit 03
Each motor (14) (15jαη09
This is a control circuit that controls the drive/stop, rotation speed, rotation direction, etc. of the digital signal processing circuit 10), and also controls the output level from the digital signal processing circuit 10).

Therefore, during recording, the audio signal input to the input terminal (1) is first converted into a digital signal by the digital signal processing circuit (2), and then the servo signal (pilot signal or sync signal) is output from the servo signal generation circuit (3). etc.) and the subcode signal (track number, etc.) generated by the subcode generation circuit (4).
(time information, start signal) is sent to the recording amplifier (6). The output of the recording amplifier (6) is then sent to the rotary transformer (7) of the rotary head cylinder and recorded on the tape (22) by the recording/reproducing rotary head (8).

Next, during playback, various signals recorded on the tape @ are read by the recording/playback rotating head (8), and the playback amplifier (
9). Then, the output of this reproduction amplifier (9) is converted into a re-digital signal by a digital signal processing circuit (00), which generates a clock from the data using a PLL or the like, and then converts it into an analog signal, which becomes the original audio signal. It will be output from the output terminal α1). Furthermore, the output of this reproduction amplifier (9) is sent to a servo circuit (12), where a servo signal for tracking control is extracted to generate a tracking error signal, which is then sent to a motor drive circuit (4). and controls the capstan motor 09). Further, the output of the reproduction amplifier (9) is also sent to the subcode processing circuit 03).

Therefore, during such reproduction, this subcode processing circuit 03)
The sub-code signal is extracted from the output of the reproduction amplifier (9) and a start signal indicating the start point of auto-fade-in and auto-fade-out operations is detected.Based on the detection result, the control circuit (21) outputs a digital signal. The output level from the processing circuit (10) is controlled. That is, when an auto fade-in or auto fade-out start signal is detected in the subcode processing circuit α3), the digital signal processing circuit (
10j, the level increase or decrease is gradually performed at the stage of the digital signal before it is converted into an analog signal, and therefore the digital signal processing circuit σO)
The original music signal output from the output terminal 01) gradually increases or decreases as shown in FIG. 2(a) or (b). Incidentally, FIG. 6 is a flowchart illustrating the detection operation of the subcode processing circuit α3).

(G) Effects of the Invention As described above, according to the playback method of the present invention, by recording a start signal indicating the start point of auto fade-in or auto fade-out operation in the subcode area, the start signal can be set at any point during playback. Auto fade-in or auto-fade-out operation can be performed.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of R-DAT used in the present invention,
Figure 2 (a) @ is a diagram showing the auto fade-in and fade-out operations, respectively, Figure 6 is its flowchart, and Figure 4
The figure is a track pattern diagram. αO)...Digital signal processing circuit, 03)...Subcode processing circuit, Ct...Control circuit.

Claims (1)

[Claims] (1) Forming a subcode area together with an information recording area in which information signals such as music are recorded on each track on the tape,
In a rotary head tape recorder that records the song number, playing time, etc. in this subcode area, a start signal indicating the start point of an auto fade-in or auto fade-out operation is recorded in the subcode area, and during playback. When this start signal is detected from the subcode area, the playback output level is automatically gradually increased or decreased from the time of detection to perform an auto-fade-in or auto-fade-out operation. Playback method for rotating head tape recorders.