JP2000236278A - Receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To add a sound recording-reproducing function to an image receiver, without making the constitution complex. SOLUTION: This receiver has a mode control part 20 composed of a microcomputer having a solid-state memory 52, an oscillation part 18 of PLL constitution functioning as a local oscillator, a DA conversion part 22 which obtains a frequency control voltage to be supplied to the oscillation part, and an AD conversion part 50 which converts a detection output. When the sound of a received signal is recorded, the digitized detection output is stored in the solid- state memory. When sound is reproduced, the detection output is read out of the solid-state memory. Since the D/A conversion part 22 and A/D conversion part 50 which are existing are usable, the receiver can be made small-sized without hindrance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a receiver capable of receiving an AM signal, an FM signal, a television signal, and the like. Specifically, AM signals broadcast at times shifted from the commuting time zone are stored in advance in the solid-state memory so that the stored AM signals can be reproduced and listened to when commuting. is there.

[0002]

2. Description of the Related Art As a recent receiver, there has been known a card-shaped flat type receiver which is thin and sized to be accommodated in a breast pocket or the like. Such a receiver has the convenience that it can be used freely even in a crowded place such as a commuting time zone. Moreover, even such a light and small receiver can receive AM broadcasts, FM broadcasts, and, in some cases, even low channels of television broadcasts. Therefore, during the commuting time, it is possible to receive and listen to the user's favorite broadcast.

[0003]

By the way, a program that a user wants to listen to is not always on air when the user is in a commuting time zone. Usually, it is often broadcast in another time zone. In such a case, the desired program is usually recorded by a tape recorder or the like, and the recorded program is listened to by carrying a small-sized tape recorder.

[0004] However, even though the tape recorder is miniaturized, it has a certain amount of weight, so that a burden is imposed on the user. If possible, it would be more convenient to have a small receiver.

[0005] Many of the receivers having such a function of receiving multiple bands are provided with a semiconductor memory such as a RAM, and this semiconductor memory achieves a function of storing preset channels. Therefore, the storage capacity is limited, and the contents of the broadcast program cannot be recorded using this.

Accordingly, the present invention focuses on a solid-state memory such as a flash memory having a large storage capacity, and mounts this solid-state memory on a receiver, records the contents of a broadcast program on the solid-state memory, and reproduces the program at a desired timing. The present invention proposes a receiver that can reproduce the contents of a recorded program at any time by adding a function that can be performed.

[0007]

In order to solve the above-mentioned problems, a receiver according to the present invention comprises a mode control unit composed of a microcomputer having a solid-state memory, and an oscillation unit having a PLL configuration functioning as a local oscillator. A digital-to-analog converter for obtaining a frequency control voltage to be supplied to the oscillator, and an analog-to-digital converter for converting a detection output. When a received signal is recorded, the digitized detection output is stored in the solid-state memory. It is characterized by having been made as described above.

According to the present invention, a solid-state memory can be mounted on a receiver, and a recording and reproducing function is added while skillfully utilizing an existing circuit. Then, the broadcast program is recorded in the solid-state memory. By switching the receiver to the reproduction mode, the contents of the program stored in the solid-state memory are read and reproduced. By adding this function, it is possible to reproduce and listen to the contents of a previously recorded program at a desired timing. Since it is a solid-state memory, a recording / reproducing function can be added without increasing the weight of the receiver much.

[0009]

Next, an embodiment of a receiver according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a system diagram of a main part showing an embodiment of a receiver 10 according to the present invention to which a recording and reproducing function is added. In FIG. 1, a broadcast signal (AM signal, FM signal, television signal, etc.) received by an antenna 12 is supplied to a mixer 16 via an RF amplifier 14 and further supplied from a local oscillator 18 having a PLL structure. A local oscillation signal is supplied and frequency-mixed.

The signal output from the mixer 16 is converted to an intermediate frequency signal (455 kHz,
10.7 MHz). The intermediate frequency signal SIF is guided to a detector 26 to detect a received signal, and a detected output Sd is emitted from a speaker 29 via a reproduction amplifier 28.

Since the above-mentioned local oscillator 18 has a PLL configuration, a control unit (mode control unit) composed of a microcomputer
The oscillation frequency of the local oscillator 18 is controlled by the control voltage generated at 20, and a local oscillation frequency corresponding to the frequency of the reception channel is generated.

The mode control unit 20 includes a one-chip microcomputer 30
It consists of. The one-chip microcomputer 30 includes a memory (ROM) 34 in which various control programs are stored, a working memory (RAM) 36, and a timer unit 38 for achieving a clock function, in addition to the CPU 32 serving as a core, as is well known. Further, the input / output unit (I / O) 40 is integrated into one chip. The ROM 34 stores a control program for achieving a recording processing operation and a reproduction processing operation when a recording and reproduction mode described later is selected.

The one-chip microcomputer 30 is connected to an operation unit 42 including ten keys for inputting commands and the like and a display unit 44 including a liquid crystal monitor (LCD).
Further, the one-chip microcomputer 30 is provided with a DA converter 22, and the frequency control voltage (digital signal) Sa generated by the one-chip microcomputer 30 is supplied via the input / output unit 40. Here, the signal is converted back to an analog signal, and then supplied to the local oscillator 18.

When tuning to a specific channel, the local oscillation frequency is finely adjusted based on the intermediate frequency signal SIF. Therefore, the intermediate frequency signal SIF is also supplied to the one-chip microcomputer 30. The mode control unit 20 is provided with an AD conversion unit 50, which digitizes the intermediate frequency signal SIF once and then takes it into the one-chip microcomputer 30.

In the present invention, a function of recording a signal of a receiving channel and reproducing the recorded signal is added to the mode control unit 20 having such a configuration. Therefore, first, an external memory means 52 connected to the one-chip microcomputer 30 is provided.

As the external memory means 52, a solid-state memory having a small, lightweight, flat shape and a large storage capacity, such as the flash memory described above, is used.
The solid-state memory can be configured to be freely attachable to the mode control unit 20. In this example, the case where the solid-state memory that can be attached is used is illustrated.

Further, in the present invention, a first changeover switch 54 is provided in connection with the DA converter 22, and a second changeover switch 56 is provided in connection with the AD converter 50. When the input signal of the DA converter 22 is the frequency control voltage signal Sa, the first changeover switch 54 supplies the analog frequency control voltage signal to the local oscillator 18 via the terminal a. When the input signal to the signal 22 is a detection output Sd to be described later, switching control is performed so that the analog detection output is output to the reproduction amplifier 28 via the terminal b. The switching signal Pa is generated by the one-chip microcomputer 30.

On the other hand, the second changeover switch 56 is switched so that the intermediate frequency signal SIF is supplied to the AD converter 50 via the terminal c at the time of channel frequency tuning and at the time of reproduction mode, as will be described later. In the mode, the detection output Sd output from the detector 26 is supplied to the terminal A via the terminal d.
Switching control is performed so as to be supplied to the D conversion unit 50.
The switching signal Pb is generated by the one-chip microcomputer 30.

In the mode control unit 20 described above, newly added means are an external memory means 52, two changeover switches 54 and 56, and some keys for mode selection operation keys (recording key, reproduction key, etc.). Only additions or changes. Therefore, since these are only added, the miniaturization of the receiver 10 is not hindered,
Also, the weight does not increase much.

Next, the operation of the thus configured receiver 10 according to the present invention will be described sequentially with reference to flowcharts and the like. FIG. 1 is a system diagram showing the channel reception mode. This usage example is the same as the usage example of a normal receiver. In this case, the operation for tuning to the reception channel and the reception operation after tuning are performed with the intervention of the mode control unit 20. Therefore, the changeover switches 54 and 5
6 are switched to the state shown by the solid line, the intermediate frequency signal SIF is taken into the one-chip microcomputer 30 to generate a frequency control voltage signal, and this is supplied to the local oscillator 18 via the DA converter 22. Then, a local oscillation frequency that is perfectly tuned is output. After tuning, the detection output Sd of the received channel is emitted.

FIG. 2 shows the recording mode. Operation unit 4
When a command for a channel and a recording mode in which a recording time is designated is issued by a command from 2, a channel tuning operation and a signal storing operation are performed in this case.

Therefore, the first changeover switch 54 is switched to the state shown by the solid line, and the second changeover switch 56 is first switched to the state shown by the broken line. This is the same as the switching state in the channel reception mode. In this mode, first, tuning processing of a channel to be recorded is performed.

When a channel is selected, only the second changeover switch 56 is switched to the state shown by the solid line, and a transition is made to the recording mode. That is, when the tuning processing is completely completed, a signal (detection output) Sd of the channel received from the detector 26 is obtained. This detection output Sd is supplied to the AD converter 50 via the second switch 56, and is converted into a digital signal having a predetermined number of bits. This digital detection output is stored in the external memory means 52 via the one-chip microcomputer 30. At the time of storage in the external memory means 52, address information or the like for access is generated, and this is filed and stored in the RAM 36 or the external memory means 52 itself.

When the recording mode ends, the power of the receiver 10 is automatically turned off. The recording mode is not limited to the timer recording, and a direct recording mode for directly recording an on-air channel can be selected.

FIG. 3 shows a reproduction mode. In this case, the changeover switches 54 and 56 are switched as shown, and the one-chip microcomputer 30 starts read access to the external memory means 52. The detection output read from the external memory means 52 is returned to an analog signal by the DA converter 22. Thereafter, the signal is supplied to the speaker 29 via the first changeover switch 54 and the reproduction amplifier 28,
The stored received signal is reproduced.

Such an operation can be realized by the flowchart shown in FIG. Description will be made sequentially from FIG. In FIG. 4, when the power of the receiver 10 is turned on, the reception frequency immediately before the power is turned off is set (step 6).
1). This is the same as before. Next, a timer interrupt is checked (step 62). In the case of timer recording, the process shifts to another step by this timer interruption, and the processing will be described later.

When there is no timer interruption, the operation unit 4
When the second reception key is operated (step 63), the changeover switches 54 and 56 are switched to the tuning mode of FIG. 1 (step 64). Thereafter, the local oscillation frequency is set so as to be the selected channel frequency (step 65), and fine adjustment processing of the local oscillation frequency is performed so that the channel can be correctly received (steps 66 and 67). When the frequency reaches the predetermined intermediate frequency, the mode is switched to the reception mode, and the selected channel is received (step 68). This mode continues until the power is turned off or another mode is selected (step 69).

If another key is selected in step 63 instead of the channel selection key, for example, a recording key provided on the operation unit 42 (step 71), the switch switching state as shown in FIG. As described above, the tuning operation for the channel specified in advance is performed (step 72). Therefore, as described above, the local oscillation frequency is set to the tuning frequency of the specified channel, and
Fine adjustment of the frequency is performed (steps 73 and 7).
4, 75).

Next, the mode is switched to the recording mode by setting the changeover switches 54 and 56 to the switching state shown by the solid line (step 76). That is, a memory process for storing the detection output of the reception channel in the external memory means 52 is performed (step 77). This memory operation continues until the recording key is turned off (step 78). After the recording key is turned off, the process returns to step 69.

When a key other than the channel key and the recording key is pressed, for example, a reproduction key, the flow goes to step 81 shown in FIG. In this case, the mode shown in FIG. 3 is set, and the changeover switches 54 and 56 are switched to the reproduction mode (step 82). And external memory means 5
2, the detected output of the designated channel is read, and the signal is reproduced (step 83). This reproduction process is performed until the detection output (data) of the same channel disappears (steps 84 and 83). When the data disappears, the reproduction mode is automatically stopped, and the process goes to step 69 (step 85).

When a key other than these keys, which is to be in the stop mode, is selected (step 8).
6) All the modes selected immediately before are stopped. That is, the reproduction mode, the recording mode, or the reception mode is all stopped, and the process proceeds to step 69 (steps 87 and 88).

Next, the timer recording mode will be described with reference to FIG. In step 62 of FIG. 4, the timer interrupt is checked, and if a timer interrupt occurs, it is checked whether it is an interrupt to the recording mode. This is performed by step 90 shown in FIG.

When it is determined that the interruption is the recording mode, the local oscillation frequency is set by the frequency control voltage signal from the one-chip microcomputer 30 so that the designated reception channel is selected (step 9).
1). Then, a tuning process is performed to allow the designated channel to be correctly received (steps 92 and 9).
3, 94). Thereafter, the changeover switches 54 and 56 are switched as shown by the solid line in FIG. 2 so as to enter the recording mode (step 95). Then, the received digital data of the detection output Sd is stored in the external memory means 52 until the designated recording time of the channel has elapsed (steps 96 and 9).
7).

This series of operations is substantially the same as steps 72 to 78. When the designated recording time has elapsed, the recording mode is stopped, and the power is controlled to be off (steps 98 and 99). To play back the received signal recorded in this way, press the play key as shown in FIG.
Since the reproduction channel may be designated, the detailed description is omitted, and the user can enjoy the program stored in the external memory means 52 in a desired time zone such as a tsu approximate hospitality.

[0035]

As described above, according to the present invention, a recording / reproducing function using a memory is newly added.
According to this, the contents of the program to be aired at a time outside the commuting time zone can be recorded in advance by a timer. The content of the program can be reproduced at a necessary timing such as a commuting time zone. Also,
A solid-state memory can be used as the memory,
Since any existing AD conversion unit and DA conversion unit required for recording the received signal can be used, the miniaturization of the device is not hindered. Since there are few additional parts, a portable receiver can be provided. Therefore, the present invention is very suitably applied to a flat type receiver such as a card type which is convenient for carrying.

[Brief description of the drawings]

FIG. 1 is a system diagram of a main part showing an embodiment of a receiver according to the present invention, showing a channel reception mode state.

FIG. 2 is a system diagram similar to FIG. 1, showing a recording mode state.

FIG. 3 is a system diagram similar to FIG. 1, showing a playback mode state.

FIG. 4 is a flowchart showing an example of mode processing (part 1);
It is.

FIG. 5 is a flowchart illustrating an example of a mode process (part 2);
It is.

FIG. 6 is a flowchart illustrating a mode processing example (part 3);
It is.

[Explanation of symbols]

 Reference Signs List 10 receiver 16 mixer 18 local oscillation PLL circuit 20 mode controller 22 DA converter 26 detector 30 1-chip microcomputer 50 AD converter 52 external memory means (solid-state memory) 54, 56 switch

Claims (5)

[Claims] 1. A mode control unit including a microcomputer having a solid-state memory; an oscillation unit having a PLL configuration functioning as a local oscillator; a DA conversion unit for obtaining a frequency control voltage to be supplied to the oscillation unit; And a digital-to-analog converter for converting the digitally detected output into the solid-state memory when a received signal is recorded. 2. When reproducing a recorded reception signal, the D
2. The receiver according to claim 1, wherein the digital detection output is converted to an analog signal by an A-converter and then output to a reproduction amplifier. 3. A first switch provided on the side of the DA converter, and a second switch provided on the side of the AD converter.
A switching switch for switching between a frequency control voltage and an analog detection output read from the solid-state memory with the first switching switch, and an intermediate signal from an intermediate frequency filter with the second switching switch. 2. The receiver according to claim 1, wherein a frequency signal and a detection output are switched. 4. The first and second changeover switches,
2. The receiver according to claim 1, wherein the receiver is controlled by a switching signal from the mode control unit. 5. The receiver according to claim 1, wherein a flash memory is used as said solid-state memory.