JPH04126332U - cassette tape playback device - Google Patents

Abstract

(57) [Summary] (with modifications) [Objective] To provide a cassette tape playback device that can improve the operating feeling after activating the music scan function. [Structure] When a microcomputer detects the end of a tape four times during a scan operation, the scan operation is canceled. As a result, the playback surface after the scan operation is canceled can be set as the scan start surface, and tape playback can be started immediately from the scan start surface without any operation.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a cassette tape playback device, and more specifically to a music scan. The present invention relates to a cassette tape playback device having functions.

0002

[Prior art and problems to be solved by the invention]

Conventional cassette tape playback devices are equipped with a music scan function. There is. The music scan function allows you to play the beginning of a song for a certain period of time and then start the next song. The system enters a high-speed fast forward state (hereinafter referred to as FF state) in which it searches for the next song. This function repeatedly plays the beginning of the song for a certain period of time. this The function is to know briefly what songs are recorded on an unknown tape. This is very useful when you want to know the contents of the entire tape in a short time. When activating such a music scan function and performing a scan search, In this case, it is better to cancel the scanning operation after scanning all the songs on the tape. It is easy for the user to use, and is advantageous in terms of durability of the drive system, etc. but However, in the case of music scanning of cassette tapes, it is possible to scan all the songs in one cycle. Since it is very difficult to judge whether the end of the tape is It is determined that the scan has been completed at least once, and the scanning operation is canceled at that point. .

0003 Note that the end of the tape is determined by the change in the rectangular pulse signal from the reel pulse detection device. It is detected by the microcomputer detecting the change. In other words, the skein The reel into which the tape is inserted in the cut-tape playback device has a A reel pulse detection device that outputs a pulse signal is installed, and the tape is played back. The position determines the number of square pulses from this reel pulse sensing device using a microcomputer. It is detected by counting data. Therefore, the tape ends and the reel rotates. When the reel rotation stops, the pulse signal from the reel pulse detection device remains at a high level for a predetermined period of time. Since the output is at high or low level, the microcomputer can detect this state. By this detection, the end of the tape is detected.

0004

[Prior art and problems to be solved by the invention]

However, when performing music scan, it is not necessary to detect the end of the tape as before. When the scanning operation is canceled after three times, the tape surface where scanning started will be There was an inconvenience that the scanning operation was canceled on the opposite tape surface. example For example, if you start scanning from the middle of side A of the tape, side A, side B, side A, and 3 After detecting the end of the playback, the scanning operation is canceled and normal playback resumes from the beginning of side B. It was in the PLAY state. For this reason, perform a music scan. If you try to return to the starting playback position after However, the problem was that the operation feeling was poor.

[0005] This invention was devised in view of these issues, and is a music scan machine. A cassette tape that can improve the operating feeling after activating the function. The purpose is to provide a playback device.

[0006]

[Means to solve the problem]

In order to achieve the above object, the cassette tape playback device according to the present invention is On a cassette tape playback device with a scan function, the The scanning operation is carried out after detecting the end of the tape an even number of times, which is more than three times. The present invention is characterized in that it includes scanning operation canceling means for canceling the scanning operation.

[0007]

[Effect]

According to the above configuration, the end of the tape is detected an even number of times more than three times during the scanning operation. comprising a scanning operation canceling means for canceling the scanning operation when the scanning operation is completed. Therefore, after the scan operation is canceled, the playback side of the tape will be the scan start side. It will be set. Therefore, after scanning, immediately remove the tape from the scanning start surface. It becomes possible to start playback, and the operation feeling is improved.

[0008]

【Example】

Below, an embodiment of the cassette tape playback device according to the present invention will be explained based on the drawings. Ru. FIG. 1 schematically shows an embodiment of the signal system of a cassette tape playback device according to the present invention. There is a block diagram, and number 11 in the diagram shows the head that reads songs recorded on tape. ing. The signal read by the head 11 during tape playback is processed by an equalizer. After being sent to the amplifier 12 where the frequency characteristics are adjusted and amplified, the inter-song detection is performed. It is output to the circuit 13. When a signal is input, the song interval detection circuit 13 detects that the input signal is a song. Detects whether it is between songs or during a song, for example, if it is between songs, the high level of the inter-song detection signal, or if the song is in the middle of a song, the low-level inter-song detection signal. Output to the microcomputer 14. This microcomputer 14 has a The above-mentioned rectangular reel pulse signal is also input from the reel drive system 15. The microcomputer 14 receives the input reel pulse signal and the above-mentioned Based on the detected song interval detection signal, judgments, etc., which will be described later, are made. Then, according to the judgment result , FF/PLAY control signal, capstan motor control signal or playback surface switching output control signals etc. to the deck drive system 15 to control each part of the deck drive system 15. Ru. The reproduction surface switching signal is also output to the equalizer amplifier 12, and the equalizer The amplifier 12 operates in the equalizer amplifier 12 based on the input playback surface switching signal. It is designed to switch the channel switch.

[0009] A flowchart of the operation of the microcomputer 14 is shown in FIG. Shown in Figure 2 As shown in the example above, a cassette tape playback device can be scanned using the music scan function. When the microcomputer 14 enters the A tape end detection counter N is initialized to 0 (step 1). Then micro The computer 14 determines the beginning of the song based on the song interval detection signal sent from the song interval detection circuit 13. Determine whether or not it has been detected (step 2), and if it is determined that the beginning of the song has been detected , the microcomputer 14 has already gone too far by the time it is detected. Calculate the amount of overshoot of the tape, and use the calculation result to determine the capstan motor control signal. The tape position is corrected so that it is output to the deck drive system and playback starts from the beginning of the song. (Step 3). After this, the PLAY control signal is output to the deck drive system, and the FF state From the state to the PLAY state, playback is started (step 4). Next, My The computer 14 detects the song based on the song interval detection signal sent from the song interval detection circuit 13. Determine if it has started (step 5), and if not, wait until playback starts. The judgment in step 5 is made until the When the song started again, microcomputer 1 4, the process proceeds to step 6, and the playback continues for a predetermined number of seconds, for example, 12 seconds or more. Determine whether the above period has passed. If 12 seconds have not passed, wait until it does. Repeat step 6 and if it is determined that 12 seconds have elapsed, start scanning. Start the search again (step 7) and go back to step 1 and perform the same operation as above. Let's do it.

0010 On the other hand, if the beginning of the song is not detected in step 2, the microcomputer 14 If it is determined that the end of the tape has been detected, the microcomputer 14 then determines whether the end of the tape has been detected. (Step 8). As mentioned above, when the tape ends The reel pulse signal remains at high or low level for a predetermined period of time or more. The tape is input to the computer 14, and the tape is determined from the result of the input pulse. When the microcomputer 14 determines that the tape has reached its end, the tape end detection counter Set N to N+1 (step 9). Next, the tape end detection counter N becomes 4. In other words, whether the end of the tape has been detected four times already. (Step 10), and if it is determined that it has not been performed 4 times, switch the playback screen. output control signals to the deck drive system 15 and equalizer amplifier 12, respectively, and The raw side is switched (step 13). Then go back to step 1 and repeat the above Perform the same action. Also, in step 8, if the tape is not at the end, the microcomputer If the computer 14 makes a determination, the process similarly returns to step 1.

[0011] If the end of the tape has already been detected four times in step 10, the microcomputer If the camera 14 determines that it is switched to the scanning operation start surface, the The microcomputer 14 sends an FF/PLAY control signal to cancel the scan operation. A signal is output to the deck drive system 15 to cancel the scanning operation (step 11). After shifting to the PLAY operation (step 12), the microcomputer 1 Finish the judgment in step 4.

0012 Note that although the tape end detection counter N was set to 4 in step 10, this is not limited to this. It can be set as an even number greater than 3. however If N=4, it will return to the scanning start screen in the shortest time after music scanning. can be done.

[0013] In the embodiment described above, the microcomputer operates during the scanning operation. The scanning operation is canceled when the datater 14 detects the end of the tape four times. So, the playback side after music scanning will be set to the scan start side. . Therefore, you can immediately play the tape from the scan start side without performing any operations. This improves the operating feel of the cassette tape playback device. can be done.

[0014]

[Effect of the idea]

As detailed above, in the cassette tape playback device according to the present invention, the When the end of the tape is detected an even number of times, which is more than three times, during scanning operation, the Since it is equipped with a scan operation canceling means for canceling the scan operation, the scan operation can be canceled. The playback surface after being canceled can be set as the scan start surface. Therefore, what You can immediately start playing the tape from the scanning start surface without performing any operations. This makes it possible to improve the operational feel of the cassette tape playback device. Ru.

[Brief explanation of drawings]

FIG. 1 is a block diagram schematically showing an embodiment of a signal system of a cassette tape playback device according to the present invention.

FIG. 2 is a flowchart showing the operation of the microcomputer.

Claims (1)

[Scope of utility model registration request] 1. A cassette tape playback device having a music scan function, comprising scan operation canceling means for canceling the scan operation when the end of the tape has been detected an even number of times more than three times during the scan operation. A cassette tape playback device featuring: