JP2711093B2 - Channel preset method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel preset method suitable for being applied to a channel preset system such as a double-cassette tape recorder with a built-in tuner. [Related Art] In a double cassette tape recorder or the like, there is a tendency that two independent tuners are built in each deck in association with each other so that different broadcast contents can be simultaneously recorded. In addition, there is a tendency that a display unit is provided independently for each of the two tuners, so that a reception channel (including a reception frequency; the same applies hereinafter), a current time, and the like can be displayed. And with the remarkable development of semiconductor technology in recent years, synthesizer-type electronic tuners have become relatively inexpensive, so tuners built into double-cassette tape recorders also use such electronic tuners. There is. When such a synthesizer-type electronic tuner is used, a plurality of broadcasting stations can be preset to preset channels corresponding to a plurality of preset keys by using a microcomputer used for controlling the electronic tuner. . In this case, a mode switching key (hereinafter referred to as a memory key) is usually provided for channel presetting, and a preset mode is set by operating the memory key. Thereafter, a broadcast station to be preset is selected and a predetermined preset key is operated. By doing so, the broadcast station currently receiving (specifically, the reception frequency) is preset to the operated preset key. A plurality of preset keys are provided. As described above, in a double cassette tape recorder capable of receiving television channels, seven to eight preset keys are prepared. [Problems to be Solved by the Invention] By the way, when presetting a predetermined broadcasting station,
As described above, the memory key is always operated first to switch to the preset mode, and thereafter, the desired broadcast station is preset. Therefore, according to such a channel presetting method, first, it is necessary to attach a memory key for channel presetting, and secondly, for channel presetting, selection of a preset mode and selection of a preset key are required. There is a problem to be solved in both the mechanical aspect and the operational aspect, such as the need to perform the two operations described above. In particular, considering the case of a receiving device mounted on a car or a car stereo, etc., it is not always the case that the preset operation is not performed during traveling, so in such a case, the preset operation is simple. Absent. Therefore, the present invention solves such a problem simply with a configuration, and proposes a channel presetting method in which the number of memory keys is reduced and the operability associated therewith is improved. [Technical Means for Solving the Problems] In order to solve the above problems, in the present invention,
When presetting a plurality of broadcast stations using a plurality of preset keys, the station to be preset is set to a reception state, and when an operation of any preset key is started, the stored data corresponding to the preset key is stored. The preset frequency is displayed, and when the preset key has been operated for a predetermined time or more, the frequency of the broadcast station to be preset is stored in a memory area corresponding to the preset key, and the frequency is displayed as the preset frequency. It is characterized by doing so. [Operation] First, a broadcast station to be preset is received. Thereafter, the operation state of the preset key is checked. Next, it is checked whether a predetermined time has elapsed since the operation of the preset key. When a predetermined time has elapsed after the start of the operation, the memory contents are changed to the frequency of the broadcast station being received, and the stored frequency is displayed, assuming that the preset mode is set. If the operation of the preset key is canceled before the predetermined time has elapsed, it is determined that the mode is not the preset mode, and the memory content is not changed. Thereby, the channel preset operation is completed by one operation. Since the preset frequency (broadcasting station) is displayed, it can be confirmed. Embodiment Next, a case where an example of a channel preset method according to the present invention is applied to the above-described channel preset system of a double cassette tape recorder with a built-in tuner will be described in detail with reference to FIG. FIG. 1 shows a receiving system of a double-cassette tape recorder with a built-in tuner. In this example, the present invention is applied to a tape recorder having a pair of decks and independent electronic tuners, that is, two synthesizer-type electronic tuners. is there. In the figure, reference numerals 1A and 1B denote first and second receiving systems. In the embodiment, an AM / FM receiver is used as the first reception system 1A,
As an example of the second receiving system 1B, an audio receiver for television broadcasting will be described. Explaining from the first receiving system 1A, a desired channel is selected as a broadcast signal by the AM / FM tuner 10, and the received signal is converted into an intermediate frequency signal unique to AM / FM in the intermediate frequency amplifier circuit 2. This is supplied to a detection circuit 3 where it is detected, and the detection output is separated into left and right audio signals in an FM multiplex demodulator 4 at the subsequent stage. The AM / FM tuner 10 is configured as a tuner of a synthesizer system, and a predetermined broadcast signal selected by the high-frequency amplifier circuit 11 is frequency-mixed by the mixer 12. A local oscillation signal corresponding to the broadcast signal selected from the PLL 14 is input to the mixer 12, and is converted into a predetermined intermediate frequency. Reference numeral 13 denotes a reference oscillator. In the case of the synthesizer system, the PLL 14 is configured as shown in FIG. 2 as is well known. In the figure, reference numeral 15 denotes a VCO whose output (local oscillation frequency) is supplied to a mixer 12 and also supplied to a programmable divider 16, which divides the frequency into a predetermined frequency by a tuning signal supplied from a microprocessor 40. Is done. The frequency-divided output is compared in phase with a reference signal in a phase comparator 17, and the comparison output is passed through a low-pass filter 18 to the VCO 15
Is supplied as an oscillation frequency control signal for. Therefore, a local oscillation signal corresponding to the channel selection signal is obtained from the VCO 15. In FIG. 1, reference numeral 1B denotes a television audio receiving system, and VH
The audio signal is separated from the broadcast signal for the selected TV channel in the tuner 30 for F and UHF, and the audio signal is detected by passing through the intermediate frequency amplification circuit 6 and the detection circuit 7, which is further subjected to TV multiplexing. The signal is supplied to the demodulator 8 and is reproduced in a state where it is separated into left and right audio signals. Also in the audio receiving system 1B, an electronic tuner of a synthesizer system is used as the tuner 30. 31 is a high-frequency amplifier circuit, 32 is a mixer, 33 is a reference oscillator, and 34 is a PLL. Each of the above-mentioned PLLs 14 and 34 is individually controlled based on a system control circuit for controlling the system, in this example, a tuning signal transmitted from the microprocessor 40. The microprocessor 40 receives a mode command signal from an operation system 50 having operation keys for controlling various modes. In addition, the control signal from the microprocessor 40 controls the display contents and display state of the display units 60 and 70 provided corresponding to the respective receiving systems 1A and 1B. The display units 60 and 70 are composed of liquid crystal or the like, and examples of display contents are shown in FIGS. 3A and 3B. It is assumed that the display section 60 provided corresponding to the receiving system 1A displays a receiving channel (especially, frequency display because it is an AM / FM system), a current time, and a preset number of the receiving channel. On the other hand, the display section related to the receiving system 1B
70 indicates that only the reception channel of the television broadcast is displayed. This is based on the following reasons. Since there is no channel number in the AM / FM system like a TV, it is better to display the frequency of the receiving channel, and that display system satisfies the current time display segment number. This is because it can be used as a time display system. Also, in that case, the number of display segments on the other display unit 70 can be minimized, which is more preferable for cost reduction. From such a viewpoint, the other display unit 70 is configured as a two-digit display. Reference numeral 51 denotes an operation key for switching display contents on the display units 60 and 70, that is, a display switching key. By this switching, the timer setting time and the like can be displayed. Reference numeral 80 denotes a power supply control circuit for the receiving systems 1A and 1B, and its control signal is also supplied from the microprocessor 40. The operation system 50 is provided with a plurality of, in this example, seven preset keys P1 to P7 as shown in FIG. 4, and a desired broadcast station is preset for each. By the way, in the present invention, when the preset keys P1 to P7 are continuously operated for a predetermined time, the frequency of the broadcast station in the receiving state is replaced with the frequency originally stored in the preset channel corresponding to the operated preset key. Can be written. FIG. 5 shows an example of a control program for realizing this channel preset method. First, after selecting a broadcasting station to be preset, an arbitrary preset key is operated (step 81). By this operation, the frequency of the broadcasting station currently being received (that is, the broadcasting station to be preset) is stored (step 82), the signal reproduction path of the tuner is muted, and then the preset channel corresponding to the operated preset key is returned to the original. The frequency of the broadcast station stored in the memory is called, and the frequency is displayed on the display unit (steps 83 to 85). Then, when the preset broadcasting station enters the receiving state, the mute state is released and returns to the reproducing state (steps 86 and 87). In the synthesizer tuner, the tuning state to the desired broadcasting station is determined by the frequency of the synthesizer tuner. Since it can be determined by the presence or absence of a lock, this locked state is actually checked. Subsequently, the presence or absence of the operation state of the preset key is checked (step 88). In the embodiment, when the operation is continuously performed for 2 seconds or more, the mode is determined to be the preset mode.
In other cases, the processing is performed as if the mode was not the preset mode. Therefore, when the preset key is operated continuously for more than 2 seconds, mute is activated again (step 9).
0), the frequency written in step 82 is called and displayed, and the calling frequency is rewritten to the preset channel corresponding to the previously operated preset key (steps 91 to 93). Thereafter, the frequency locked state of the synthesizer tuner is checked again, and when the locked state is reached, the mute is released and the preset mode ends (steps 94 and 9).
Five). The purpose of checking the frequency lock state is to confirm that the channel has been correctly tuned. Even if the preset key is operated, if the operation is released within two seconds, the preset mode is not executed. The following three cases can be considered as situations where the operation of the same preset key does not continue for more than 2 seconds. 1. In the case of mere channel selection 2. When the station stored in relation to the operated preset key matches the rewritten station 3. In the station stored in relation to the operated preset key When it is determined that the station does not want to be rewritten. If the operation of the preset key has not been performed for more than 2 seconds, it is checked whether or not another preset key has been operated (step 89). When no other preset key is operated, the preset mode ends immediately. On the other hand, when another preset key is operated, the process returns to step 83, and transitions to the normal channel preset mode as described above. FIG. 6 shows another example of the control program. In this example, the reception state of the previous preset broadcast station is omitted. Therefore, when the preset key is operated, the preset frequency is displayed (steps 81 to 85), and after confirming the preset broadcast station, it is confirmed that the operation of the same preset key is continued, and the operation is continued. If
Next, it is checked that the continuation has continued for a predetermined time (2 seconds in the embodiment) (steps 101 and 102). If 2 seconds or more have elapsed, the process proceeds to step 91 and thereafter, and the preset frequency is rewritten as described above. On the other hand, if there is no continuation of the operation of the same preset key, it is determined in step 103 whether or not another preset key has been operated.
The frequency of the broadcast station stored corresponding to the newly operated preset key is called (step 84). If no other preset key has been operated, it is determined that this is a mere tuning operation (steps 94 and 95). Therefore, it differs from FIG. 5 in the following points. In FIG. 5, the judgment of rewriting or preset tuning is performed at the same time, whereas in the case of FIG. 6, the judgment of preset tuning is earlier than the judgment of rewriting. Can be done quickly. In each of the above embodiments, the step of storing the frequency of the broadcasting station which has been received until the preset key is pressed (step 82) is provided. However, in the actual synthesizer tuner, it is necessary to select the station. It is equipped with a memory that stores the broadcast station frequency (called the last channel memory), and by using this,
The broadcast station frequency during reception can be stored without newly installing a memory, and step 82 can be omitted. That is, according to such a synthesizer tuner, the broadcast station frequency that is already being received is stored in the last channel memory before the preset key is operated, and only when the preset key is operated after the preset key is operated. , Step 89 in FIG. 5, step 10 in FIG.
After step 3, the contents of the last channel memory are rewritten to the frequency of the preset station. The above-described last channel memory is used in the following cases. That is, when the power is turned on in the ordinary synthesizer tuner, the operation is performed so as to set the broadcast station that was received immediately before the power was first turned off. In order to achieve this operation, the broadcast frequency in the receiving state when the power is turned off is stored using a nonvolatile last channel memory, and the broadcast station frequency stored in the last channel memory is always stored when the power is turned on. Call it as an initial value. Further, when the band is switched (for example, from AM to FM), the AM broadcast station that has been received until then is stored, and the band is switched again (FM
From AM to AM), the previously stored broadcast station is called up. Also in this case, when the band is switched using the last channel memory, the broadcast station frequency that has been received up to that time is stored, and the broadcast station frequency that was stored when the band was switched earlier is recalled. The above-mentioned predetermined time is only an example. [Effects of the Invention] As described above, according to the present invention, the channel preset operation can be simplified as compared with the related art. Therefore, the operability for presetting is improved, and it is not necessary to provide a memory key or the like, so that the cost can be reduced accordingly. Further, in the present invention, since the frequency of the broadcasting station to be preset is displayed, the broadcasting station to be preset can be confirmed, so that erroneous operation can be prevented, and whether or not the broadcasting station is the same as the preset broadcasting station can be confirmed. It has the feature that unnecessary preset operations can be avoided because it is possible. Therefore, the present invention is extremely suitable for application to the channel preset system of a double cassette tape recorder having a pair of tuners employing the above-described synthesizer system.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram of a main part showing an example of a double cassette tape recorder having a pair of synthesizer type electronic tuners to which the present invention can be applied, and FIG. 2 is a main part of a synthesizer type electronic tuner. FIG. 3 is an explanatory diagram of display contents, FIG. 4 is an explanatory diagram of an operation system, and FIGS. 5 and 6 are flowcharts showing an example for realizing a channel preset mode. 1A, 1B receiving system 10, 30 synthesizer tuner 40 microprocessor 50 operating system 51 display switching keys 60, 70 display unit

Claims (1)

(57) [Claims] When presetting a plurality of broadcast stations using a plurality of preset keys, the station to be preset is set to the receiving state, and when the operation of any of the above-mentioned preset keys is started, the stored data corresponding to the preset key is stored. When the preset key is operated for a predetermined time or more from the start of the operation of the preset key, the frequency of the broadcast station to be preset is stored in a memory area corresponding to the preset key, and the frequency is preset. A channel preset method characterized in that a frequency is displayed. 2. 2. The channel presetting method according to claim 1, wherein the predetermined time is set to 2-3 seconds.