JPS6171489A - Data retrieving device - Google Patents

Abstract

PURPOSE:To prevent to discriminate that a non-signal part in the musical program is between the musical programs, for example, when the part, in which the tape starts to be wound, is reproduced with high speed by discriminating a travelling position of the tape by counting the number of data, removing the set time almost in correspondence to a tape position and detecting a section of the data. CONSTITUTION:By converting a reproducing signal outputted from a reproducing amplifying circuit 19 to a pulse signal by a waveform shaping circuit 21, by guiding to a musical program selecting control part 14 and by measuring a pulse period by controlling a timer circuit 14f by CPU 14b, an inter-musical program is detected. At ROM 14d, a table, in which plural kinds of the set time (td) for detecting inter-musical programs are stored, is composed in correspondence to a change of the high speed reproducing time from the beginning of winding a tape to the finish of winding a tape. By counting the number of musical programs by CPU 14b, a travelling position of the tape is judged, the set time (td) almost in correspondence to the tape position is read from ROM 14d and inter-musical programs are detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a data retrieval device, particularly to one suitable for use in a music selection function of a tape recorder.

[Technical background of the invention]

As is well known, for example, in a cassette tape recorder, a desired song is selected at high speed from among a plurality of pieces of information (hereinafter described as songs) recorded on a tape.
Devices with a music selection function are becoming popular. Recently, the song selection function is not limited to the ability to select only one song, but also allows the user to arbitrarily set multiple song numbers, and select the song corresponding to the set song number. Some devices have appeared that have a so-called program selection function that automatically selects and plays songs in sequence.

FIG. 6 shows such a conventional program selection device. That is, numeral 11 in the figure is a song number setting section, which is composed of a plurality of (five in the illustrated case) keys 118 to 11. Of these keys 11h to 11e,
By turning on any one of the voltage sources 12
The output voltage (V) of is applied to the corresponding input terminal of the encoder circuit 13. Then, the encoder circuit 13 outputs predetermined music number code data to the music selection control section 14 depending on which input terminal the voltage (V) is applied to.

Here, the music selection control section 14 includes an input port section 14a,
Central processing unit ff1 (hereinafter referred to as CPU) 1.4 b
,output? -To section 14C9 read-only memory (hereinafter referred to as R)
It consists of a read/write memory (hereinafter referred to as RAM) 14d and a read/write memory (hereinafter referred to as RAM) 14C.
The music selection operation is performed by driving the U 14 b according to the grodarum written in the ROM 1 4 d.

That is, the music number code data outputted from the encoder circuit 13 is timing-controlled by the input port section 14a and taken into the CPU 14b. Then, C
PU 14 b RAs the input song number code data.
In addition to writing to M14e, the output port section 14c
The song number is displayed on the display section 15 via t-, and the song number is set here. In addition, when setting multiple song numbers, by sequentially and exclusively turning on each key 11a to 11 et-, different song number code data is output from the encoder circuit 13, and these song numbers are This is done by sequentially writing the code data f RAM 14a and displaying it on the display unit 15.

Then, when the song number setting is completed as described above, the CPU
14b outputs a drive signal to the control circuit 16 via the output port section 14a.

Then, the control circuit 16 puts the tape recorder mechanism section 17 into a high-speed playback (cue or review) state based on the drive signal from the CPU 24b. At this time, the high-speed reproduction signal obtained from the reproduction head 18 is supplied to the song interval detection circuit 20 via the reproduction amplification circuit 19''f!:.

Here, as shown in FIG. 7(a), when the reproduction signal is generated at time (To), the song interval detection circuit 20 outputs an H level output as shown in FIG. 7(b). Occur. Generation of this H level output continues as long as the reproduction signal continues. Then, when the reproduction signal is no longer obtained at time (T2) and this no-signal (recording) state continues for more than a predetermined set time (td), the inter-song detection circuit 20 generates an L-level inter-song detection signal. This outputs the following.

This song interval detection signal is taken into the CPU 14b via the input port section 14m. Then, the CPU
14b counts the number of input inter-track detection signals, compares the count value with the track number code data set in the RAM 14e, and when the two substantially match, outputs the output port section. Control circuit 16 via 14c
Outputs the playback drive signal to. Therefore, the control circuit 16 puts the tape recorder mechanism section 17 into a reproduction state, and the desired song number is selected here.

Furthermore, if a plurality of song numbers are set, the above operation is repeated, and the songs with the set song numbers are automatically played in sequence.

[Problems with background technology]

However, in the conventional program selection device as described above, the following problems occur. That is, during high-speed playback, the tape running speed is not constant, but gradually increases as the speed of the tape approaches f from the beginning of winding to the end of winding. Therefore, in the fast-forward playback (key) state, the high-speed playback time of the no-signal portion between songs becomes shorter as shown in FIG. 8(&), and in the rewind playback (review) state, as shown in FIG. As shown in Figure 3), as the song number becomes smaller (as the tape approaches the end of winding), the high-speed playback time of the no-signal portion between songs becomes shorter.

However, the setting time (td) of the inter-track detection circuit 20 is fixed to one type, and is usually set in accordance with the high-speed playback time of the no-signal portion between songs when the tape speed is the fastest. Therefore, for example, when the beginning of tape winding is being played back at high speed, a non-signal part of a song is often judged to be an interval between songs, making it impossible to perform accurate program selection.

[Purpose of the invention]

This invention was made in consideration of the above circumstances, and is capable of accurately detecting data gaps without being affected by changes in tape high-speed playback speed, and is extremely suitable for use in the program selection function of tape recorders. The purpose is to provide a good data retrieval device.

[Summary of the invention]

That is, the data retrieval device according to the present invention detects a data interval by reproducing a tape on which a plurality of pieces of data are recorded at high speed and determining a data interval by detecting that a no-signal state continues for a predetermined set time or more. In the data retrieval device for selecting desired data from the plurality of data, the data retrieval device selects desired data from the plurality of data, wherein the high-speed playback speed sequentially changes from the winding start portion to the winding end portion of the tape. A table is provided for distributing a plurality of types of setting times for detecting data gaps of the data gap detection means in response to changes in high-speed playback time, and the running position of the tape is determined by counting the number of data. By extracting the set time approximately corresponding to the tape position from the table and detecting the data interval, it is possible to accurately detect the r-evening part without being affected by changes in the tape high-speed playback speed. The present invention is particularly suitable for use in the program selection function of a tape recorder.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, the same parts as in FIG. 6 are indicated by the same symbols, and only the different parts will be explained here. That is, the reproduction signal output from the reproduction amplifier circuit 19 is converted into a base pulse signal by the waveform shaping circuit 21 and guided to the music selection control section 14, and the pulse period of the base pulse signal is determined by the CPU 14b or the timer. By controlling and measuring the circuit 14ff, the - song interval is detected.In short, the song selection control section 14 detects the song interval that was detected using the 10 song interval detection circuit 20. It is something that exists.

Specifically, first, from the regenerative amplifier circuit 19 as shown in FIG.
When a reproduced signal as shown in FIG. 'Generate a russ signal. The period of this pulse signal (
Although the pulse interval (pulse interval) varies slightly depending on the reproduced signal, it is a very short time as long as the reproduced signal lasts. Then, the CPU J 41) controls the timer circuit 14f'fts" so that it is set (drive state) at the falling edge of the pulse signal 14f'fts" and is set (returned to the initial state) at the rising edge of the timer circuit 14f'fts signal. While the signal continues, the timer circuit 14f is set and reset in a short cycle.When the reproduced signal is no longer obtained at the current time (Tl), the timer circuit 14f is reset. When this no-signal state continues for a predetermined set time (td) or more, that is, when the timer circuit J4f counts the set time (td), the CPU 14b determines that it is between songs. This is what I try to do.

It goes without saying that the set time (ta) is set to a different time during high-speed playback and during normal playback.

In addition, the ROM 14dK has a set time for detecting between songs in response to changes in the high-speed playback time of the no-signal portion between songs due to the sequential change in high-speed playback speed from the beginning of tape winding to the end of winding 9. A table is configured in which multiple types of (td) are stored. Then, the CPUJ4b determines the running position of the tape by counting the number of songs, and the set time (td)' approximately corresponds to the tape position.
The data is read from the tROM 14d to perform song interval detection. Further, the above table is created in correspondence with the music selection operation in the queue state and the music selection action in the review state, respectively.

Here, before explaining the specific music selection operation of the music selection control section 14, an outline of the music selection operation explained in this embodiment will be briefly explained. First, Figure 3 shows the definitions of during a song and between songs.
+'l ) are recorded continuously on the tape via the inter-song section (M). As mentioned above, when the playback of the song (N) ends, the inter-song no-signal section becomes the time (td ). Since the continuous state is considered to be between songs, the total time (ts + td), which is the playing time of song (N) < ta ) plus the above time (td)', is defined as during the song. Department (M)
The time (tk) subtracted from the above time (td)' is defined as the interval between songs.

Then, as shown in Figure 4 (a), the starting end (
At the beginning of the volume, there are 1 song, 2 songs, 3 songs, etc. as shown.
・Suppose that a song is recorded. Here, the above CPU
14b, and the set song number t-(N), the tape recorder mechanism 17 selects a song in the fast-forward playback (key-) state when N>A, When N<A, a song is selected in a rewind playback (review) state, and when N=A, that song is played back.

Here, when the song selection starts from the beginning of the tape and enters the cue state or playback state (if track number 1 is set), the timer circuit 14f is driven only at this time even if the pulse signal does not fall. As shown in FIG. 4(b), after the elapse of time (td), the CPU 14b sets the count value to "1". Then, after the cue state or playback state of the first song ends and time (td) has elapsed, the count value changes to "
2" υ, and thereafter the count value (A) is sequentially incremented by +1. At t7'c, when selecting music when N<A above, as shown in the fourth factor (c), the count value (A) is incremented by -1 one by one, passing through the beginning of the last song (first song), and then Control is performed so that the count value (A) becomes "1" after the elapse of time (td).

For example, while playing the selected nine arbitrary songs (N),
When the stop operator or the 2-z operator is operated to stop tape running, the CPU 14b detects that the pause operator has been operated, and at the time of this detection, the timer circuit 14f is activated. control to stop the operation. Therefore, if the stop operator or pause operator is operated during the no-signal portion of the song (td) during playback of song (N), the stop operator or pause operator may be operated after the playback signal disappears. The time counted by the timer circuit 14f until the operation is detected is held as is in the timer circuit 14f, and tape running is stopped in this state. Therefore, even if the tape running is stopped, the count value of the timer circuit J4f &! (td) and the CPU
14b will not undesirably increase the inter-song count value (A) by +1.

Operate the playback controls while the tape is stopped,
When tape playback is started again, the CPU 14b drives the timer circuit 14ff again from the count value when the tape stopped running, and after (td) time elapses, the count value (A) k +
Do 1. Therefore, the principle that the inter-music count value (A) is always incremented by 1 after (td) time after the reproduction signal disappears is not disrupted, and stable program selection can be continued.

Furthermore, even if the reproduction of the reproduction signal portion of the song (N) is stopped in the middle of reproduction, the timer circuit 14f retains the time from the fall of the 4th pulse signal to the time of stopping, and the drive is stopped in the next state. The inter-song count value is never incremented by +1.

Then, when tape reproduction is started again, the timer circuit 141 starts counting the time again from the time held above, but in this case, it is reset at the rise of the next pulse signal.

Therefore, even if the tape running is completely stopped at any point during playback and the tape is played back again, the inter-track count value will not be erroneously determined.

Furthermore, if you stop the tape running at a no-signal part while playing song (N) and then enter the cue state, you can first enter the review state and wait until the last part of the previous song (N-1) is detected. Controlled to queue. This is because the inter-track detection time (ta) during playback and the inter-track detection time (ta) during cue or review time are different as described above, so tape running is stopped at a no-signal portion during playback and the next time This is because the count value held in the timer circuit 14f becomes meaningless.

Also, if tape running is stopped immediately after the playback of song (N) starts, and then the review state is entered, the song (
In order to clarify the starting point of driving the timer circuit 14f for detecting the interval between song (N) and song (N-1) and to prevent malfunction, approximately one excerpt of the playback sound of song (N) was performed. The review state is controlled after entering the song (N) completely.

Furthermore, when a song recorded before song (N) is set in the song number setting section 1 while song (N) is being played,
As mentioned above, in consideration of the case where the playback of # (N) has just started, the playback of song (N) will not be started for a few seconds (at this time, the muting switch will be turned on and no playback sound will be generated). ), then controlled to become a review operation.

Further, FIG. 4(d) shows the review flag (RF) t- in the CPU 14b. This review flag (RF) is set, for example, when tape running is stopped during the third song and then the review status is entered.
Inter-song count value (A) in U 14 b (in this case “3
'') is -1 between the 3rd and 2nd songs and becomes ``2'', which is a mistake. This is to prevent the error. Between songs (3
This is to keep the count value at "3" when the review flag is at the H level when the review flag (between the first track and the second track) is detected.

The music selection operation will be explained below with reference to the flowchart shown in FIG. First, when starting at step (Sl), keys 11a to 1 of the song number setting section 11 are pressed at step (S,).
It is determined whether or not ler is being operated. key 11
If h to Ile are not operated (No), it is determined in step (S,) whether or not music is currently being selected (queue state or review state). If the song is not being selected (No), the process returns to step (S2).

Here, if it is determined in step (S,) whether keys 11a to lle have been operated (YES) or whether music is currently being selected on Stella 7' (Ss) (YES), step (
S4), N) A (N is the set song number, A is the CPU,
14b). N ) A If (YES), step (S
, ), it is determined whether or not the l/view state is currently requested, and if it is the review state (YES), step (S
6), CPU J 4 b is the count value (A) 't-
-1. Then, in step (S,) it is determined that there is no review state (No), or in step (S6
), when the count value (A) is decremented by 1, step (S7
), the set time (td) is read from the queue table based on the count value (A), and in step (S6) the tape recorder mechanism section 17 is placed in a queue state.

After that, when it is determined in step (S,) whether the song has reached the interval, the CPU 14b determines the count value (A) k+I L in step (St.), and determines whether N=A or not in step (Sl□). It is determined whether And N=A(yEs)
It is stopped at step (81), and hereafter, for example, K so that the playback state is started. Also, N!q
If A (No), it will be returned to Stella fc82),
A final act is performed.

Next, in step (S4), if N ) A, then (
No), step (SSS) determines whether or not a review state is currently requested, and if it is a review state (YES), step (SSS,) sets the count value (A).
) based on the set time (td
) is read out, and the tape recorder mechanism section 17 is placed in the Levy state a at Stella f(sts). Also, Stella f
If it is not in the review state at (sta) (No), it is determined whether the step (Sss) is in the middle of a song, and if it is in the middle of a song (YES), the review flag is set at Stella f(s□,).
F) Set t and move to step (SJJ), and if it is not during a song, move to step (Sta) without stepping (stt) t.

-t, and when it is determined in step (S□,) that a song interval has been reached, the review flag (R) is determined in step (Sn).
F) is set. If the review flag (RF) is not set (NO), CPUJ4b will set the count value (
A) 'r-1, and then returns to step (St□). Also, if the review flag (RF) is set (πS), the review flag (RF) is set in step (SZt).
RF) is reset, Stella 7' (S□□)
It will be returned to.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

〔Effect of the invention〕

Therefore, as detailed above, according to the present invention, it is possible to accurately detect the data interval without being affected by changes in the tape high-speed playback speed, and it is extremely suitable for use in the program selection function of a tape recorder. This can be achieved by providing a good data retrieval device.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing an embodiment of a data search device according to the present invention, FIG. 2 is a timing diagram for explaining the detection between songs in the same embodiment, and FIGS. 3 and 4 are the same. During the example song. A timing diagram for explaining the definition between songs and an overview of the song selection operation, FIG. 5 is a flowchart for explaining the song selection operation of the same embodiment, and FIGS. 6 and 7 each show a conventional data search device. FIG. 8 is a timing diagram for explaining the block configuration diagram and the timing diagram for explaining the inter-track detection. FIG. 8 is a timing diagram for explaining that the high-speed playback time of the no-signal portion between songs changes sequentially in the tape high-speed playback state. 11... Song number setting section, 12... Voltage source, 13...
Encoder circuit, 14... Music selection control section, 15... Display section, 16... Control circuit, 17.-f-7
' Recorder mechanism section, 18... Playback head, I9...
- Reproduction amplification circuit, 20... Song interval detection circuit, 21...
Waveform shaping circuit. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 T3 Figure 3 Meeting Figure 4 (d) Figure 6 Figure 7 Tomi 8 Figure

Claims (1)

[Claims] By providing a data interval detection means for determining a data interval by reproducing a tape on which a plurality of data are recorded at high speed and detecting that a no-signal state has continued for a predetermined set time or more, In a data retrieval device for selecting desired data, the above-mentioned method is configured to correspond to a change in the high-speed playback time of the no-signal portion between data due to the high-speed playback speed changing sequentially from the beginning of winding to the end of winding of the tape. The data gap detection means includes a table having a plurality of types of set times for detecting data gaps, and the tape running position is determined by counting the number of data, and the set time approximately corresponding to the tape position is retrieved from the table. A data retrieval device characterized in that the data search device detects a data interval.