KR19990040077U - Battery for cell-phone with voice recording function - Google Patents

Abstract

The present invention relates to a battery for a mobile phone having a voice recording function, a situation that often can not take notes, such as when receiving a call on the street when using a general mobile phone (CDMA, PCS, ANALOG), especially important If you need to remember the information, you're in trouble.

The present invention was devised to solve the above problems, and a small speaker and an IC circuit part are built in a general lithium battery case to convert a voice signal input to a microphone into a digital signal when the recording switch is operated, and then into the internal memory. When the playback switch is activated, the internal memory contents are converted back into the audio signal and output to the speaker so that important information can be easily memorized even in a situation where a memo cannot be taken. The purpose is to provide a battery.

Description

Battery for cell-phone with voice recording function

The present invention relates to a battery for a mobile phone, and more particularly, to a battery for a mobile phone having a voice recording function to temporarily record and play back a call during a call on a mobile phone.

In general, when a mobile phone (CDMA, PCS, ANALOG) calls to receive a call on the street often occurs a situation that can not take notes.

In such a case, especially if you need to remember important information, it is inevitable.

Therefore, there is a need to temporarily store information such as a person's name or a phone number in a situation where a memo cannot be taken.

The present invention was devised to solve the above problems, and a small speaker and an IC circuit part are built in a general lithium battery case to convert a voice signal input to a microphone into a digital signal when the recording switch is operated, and then into the internal memory. When the playback switch is activated, the internal memory contents are converted back into the audio signal and output to the speaker so that important information can be easily memorized even in a situation where a memo cannot be taken. The purpose is to provide a battery.

1 shows a pinout diagram of an IC used in the present invention.

Figure 2 is a circuit diagram of a battery for a mobile phone having a voice recording function of the present invention.

3 is a block diagram showing the function of the IC circuit section in FIG.

4 illustrates external biasing for conducting a duration experiment in the operation of a lithium cell battery.

<Explanation of symbols for the main parts of the drawings>

100: IC circuit portion 101: pre-amp

102 automatic gain control 103 first switch capacitor filter

104: sample holder circuit 105: analog / digital converter

106: memory array 107: memory write / lead circuit

108: digital / analog circuit portion 109: second switch capacitor filter

110: amplifier 111: control unit

112: power regulator 113: power supply

200: speaker R1: resistance

C1, C2: Capacitor

A mobile phone battery having a voice recording function of the present invention for achieving the above object is, as shown in Figures 2 and 3, a lithium battery (not shown) and the speaker 200 for outputting the recorded voice And an IC circuit unit 100 for recording and reproducing voice and outputting the voice to the speaker 200.

The IC circuit unit 100 automatically controls the gain of the pre-amplifier 101 to amplify and output the input voice signal Micin and outputs a wide range of input levels. Automatic gain control (AGC) 102 for controlling the output according to a predetermined output signal level, and a first switch capacitor filter 103 for filtering and outputting the signal (Anaout) amplified and output from the pre-amplifier 101. And a sample holder circuit unit 104 for sampling and analogly holding the analog signal filtered by the first switch capacitor filter 103, and converting the analog signal held in the sample holder circuit unit 104 to digital. The analog / digital converter 105, the memory array 106 storing the output signal of the analog / digital converter 105, and the output signal of the analog / digital converter 105. A memory write / lead circuit section 107 which is stored in the memory array 105 and reads information stored in the memory array 106 when the audio signal is reproduced, and the analog write / lead circuit section 107 when the audio signal is reproduced. Digital to analog converter 108 for converting the analog information read from the memory array 106 into digital, and a second switch capacitor filter for filtering and outputting the digital signal converted by the digital / analog converter 108. 109, an amplifier 110 for amplifying the output signal of the second switch capacitor filter 109 and outputting the signal to the speaker (SP +) and the control unit 111 for controlling recording and playback operations. Characterized in that configured.

The operation and effects of the battery for a mobile phone having the voice recording function of the present invention configured as described above will be described in more detail as follows.

First, the characteristics of the battery for a mobile phone having a voice recording function of the present invention will be described, which implements high quality voice recording and playback with a single chip, has a minimum external element without requiring an external IC, and has a nonvolatile flash memory. The technology eliminates the need for battery backup, has 100,000 recording cycles, and can store messages for 100 years. In addition, by selecting an external resistance of the oscillator generating the internal sampling frequency, a single message may be stored for 20 to 30 seconds.

The mobile phone battery with the voice recording function of the present invention provides a single chip solid state capable output and does not require any software or the assistance of a microcontroller. In addition, messages can be recorded and played back in good quality for 20 to 30 seconds, which is ideal for portable voice recorders, toys and many other consumer and industrial applications. In addition, analog / multi-level storage techniques have been employed in nonvolatile flash memory cells, each capable of storing more than 256 voltage levels. The audio signal is stored and reproduced in its initial form while eliminating distortion of the signal often generated by encoding and compression. It is also a small size device that is low power consumption, non-volatile and cost effective for easy voice recording and playback.

In addition, the present invention is easy to use because it is easy to operate by using a level-activated recording switch and an auger-activated playback switch without requiring a programming and development system.

It also consumes low power. That is, the operating current is typically 25 mA without load and the quiescent current is typically 1 mA without load.

It also features an automatic power-down feature, resulting in long battery life, a chip enable pin for single message expansion, and a single 5V power supply.

The recording and reproducing operation of the voice signal of the battery for a mobile phone having the voice recording function of the present invention will now be described with reference to the accompanying drawings.

1 shows a pinout diagram of an IC used in the present invention, where NC is in a floating state and NU is in a grounded state.

First, the inventive voice recording operation will be described.

By the control unit 111, the / LED pin is “low” to visually indicate that the LED light is connected to the pin during recording.

When the / REC pin is selected to go low, the unit is in record mode, and as long as the / REC pin remains low. The voice signal Micin input to the microphone MIC is amplified in the pre-amplifier 101 and then at a constant level by the control of the automatic gain control (AGC) 102 and the filtering of the first switch capacitor filter 103. Is output.

It is then sampled and held analog by the sampling frequency generated by the internal oscillator (not shown) in the sample hold circuitry 104 and then converted into a digital signal in the analog / digital converter 105. At this time, as shown in Table 1 below, by adjusting the external resistance (ROSC) of the internal oscillator (not shown) by changing the sampling frequency it can extend the duration of the voice.

Oscillator External Resistance Typical sampling frequency Typical total voice duration 52㏀ 6.4㎑ 20 seconds 67㏀ 5.3㎑ 24 sec 89㏀ 4.0㎑ 30 seconds

The digitized signal is stored in the memory array 106 through the memory write / read circuit unit 107, thereby completing the recording of the input voice signal.

During record mode, a single voice message of up to 20 seconds is recorded. If the message continues for more than 20 seconds, the recording is automatically cleared after the last valid memory cell has been written. If the message is less than 20 seconds, the recording operation is disabled by the / REC pin. High ”will stop.

The speaker driver automatically tristates during this recording operation.

Next, the reproduction operation of the audio signal recorded as described above will be described.

Playback can always be done at the start of the message, i.e. the recorded message is present.

The control unit 111 enters the play mode after the / Play pin pulse becomes “low” (eg-activated) and immediately stops when the / Play pin pulse becomes “low” for the second time.

During reproduction, the audio signal stored in the memory array 106 is read by the memory write / read circuit unit 107, converted into an analog signal by the digital / analog converter 108, and then filtered by the second switch capacitor filter 109. By outputting to 110, reproduction of the recorded voice is completed.

If the newly recorded message is shorter than the previously recorded message, the remaining portion of the previous message will be played after the new message is played. At this time, devices operating in the recording mode, such as the input pre-amplifier 101 and the automatic gain control (AGC) 102, are disabled.

As described above, when the recording and reproducing operation is completed, the IC circuit unit 100 automatically returns to the standby state (/ CE = "0"). The IC circuit unit 100 is always in standby state, and no recording and reproduction is allowed in this standby state. At this time, the current consumed is less than 1 mA. It also automatically powers down (/ CE = “1”) to reduce current consumption, thus extending battery life.

Figure 4 shows the external biasing for experimenting the duration in the operation of the lithium cell battery of the present invention, Table 2 shows various conditions for the duration test of the lithium cell battery operation.

In FIG. 4, R1 is 100 kΩ, the speaker external resistance Rex and capacitor C1 (C2) are shown in Table 2 below, and pins 23 and 27 of the IC circuit section 100 have an internal pullup resistor. . In addition, the typical sampling frequency is 6.4kHz for the 52kHz oscillator external resistance (ROCS).

Experiment 1 Experiment 2 comment Rev.2 Rev.2 Same 28-Pin DIP Package Lithium cell battery Sony CR2032BP [1] (3V, 220mAH) 3V × 2 = 6V Sony CR2032BP [1] (3V, 220mAH) 3V × 2 = 6V Same as Maxell CR2032 (3V, 220mAH) Decoupling CapacitorsV _CCA (Pin 16) V _CCD (Pin 28) 0.1㎌0.1 0.1㎌ + 22㎌0.1㎌ V _CCA connects directly to the batteryV _CCD connects to V _CCA through 100Ω Speaker Speaker External Resistance 8Ω, 0.5W55Ω 16Ω, 0.1W33Ω Serial with battery Other external bias conditions See Figure 4 See Figure 4 Sampling frequency 6.4㎑ 6.4㎑ Number of recurring cycles ＞ 125 times ＞ 50 times Depends on the quality and size of the acceptable voice Time interval of playback 1 ^th -100 ^th : Approx. 30 s 100 ^th -125 ^th : Approx. 1 s 1 ^th -40 ^th : Approx. 10 seconds 41 ^th -50 ^th : Approx. 20 seconds

Table 3 is a table showing the electrical characteristics of the present invention, (a) the absolute maximum ratio, (b) direct current (DC) characteristics, (c) shows the analog characteristics.

Absolute maximum rate Classification sign Condition Minimum value Value unit Power supply voltage V _cc T _A = 25 ^o C -0.3 7.0 V Input voltage V _IN1 T _A = 25 ^o C -0.3 V _CC +0.3 V Input voltage V _IN2 T _IN -1.0 V _CC +1.0 V Storage temperature T _STG -65 150 ^o C Temperature under bias T _BS · -65 125 ^o C Lead temperature T _LD <10s 300 ^o C

DC characteristics Classification sign Condition Minimum value Typ Value unit Input high voltage V _IH · 0.8 × V _CC · · V Input undervoltage V _IL · · · 0.8 V Output high voltage V _OH I _OH = -1.6㎃ 2.4 · · V Output undervoltage V _OL I _OL = 4.0㎃ · · 0.45 V Input leakage current I _IH V _IH = V _CC · · 1.0 ㎂ Input leakage current I _IL V _IL = V _SS -1.0 · · ㎂ Output tri-state leakage current I _OZ V _OUT = V _CC or V _OUT = V _SS -1.0 · 1.0 ㎂ Operating current consumption I _CC Internal clock, no load · 25 · ㎃ Standby current consumption I _CCS No-load · 1.0 ㎃

Analog characteristics Classification sign Condition Minimum value Typ Value unit Microphone input voltage V _MI · · · 20 mVp Microphone input resistance R _MI · · 10 · ㏀ Microphone input amplifier gain (1) G _M11 AGC = 0V · 24 · ㏈ Microphone input amplifier gain (2) G _M12 AGC = 2.5V · -45 -15 ㏈ Analog signal input voltage V _AN1 · · · 50 mVp Analog signal input resistance R _AN1 · · 10 · ㏀ Analog signal amplifier gain G _AN1 Analog signal input with SP +/- · 22 · ㏈ AGC output resistance R _AGC · · One · ㏀ Non-inverting / inverting speaker output power P _SP R _{SP +/-} = 16Ω · 12.2 · ㎽ Voltage amplitude at non-inverting / inverting speaker output V _SP R _{SP +/-} ≥16Ω · 1.25 · Vp

As described above, the present invention is equipped with a voice recording IC circuit in the existing battery has the effect that can be recorded and reproduced when necessary by recording a person's name or phone number in the situation that can not take notes.

In addition, the recorded content can be stored for a long time, a number of repeated recordings are possible, and there is an effect of minimizing power consumption during standby.

Claims (3)

A lithium battery; A speaker for outputting recorded voice; And Pre-amplification to amplify and output the input voice signal (Micin), and automatic gain control to control the output of a wide range input level to a constant output signal by automatically controlling the gain of the pre-amp A sample for sampling and analogly holding an AGC, a first switch capacitor filter for filtering and outputting an output signal amplified by the pre-amp, and an analog signal filtered by the first switch capacitor filter A holder circuit portion, an analog / digital converter for converting an analog signal held in the sample holder circuit portion to digital, a memory array for storing an output signal of the analog / digital converter, and an output signal of the analog / digital converter. Write to the memory array, and the memory array is reproduced when a voice signal is reproduced. A memory write / lead circuit unit for reading information stored in the digital memory; a digital / analog converter for converting analog information read from the memory array by the analog write / lead circuit unit into digital when reproducing an audio signal; and the digital / analog converter. A second switch capacitor filter for filtering and outputting the digital signal converted from the second amplifier; an amplifier for amplifying and outputting the output signal of the second switch capacitor filter to the speaker; A battery for a mobile phone having a voice recording function, characterized in that it is composed of an IC circuit unit configured to control the control. 2. The battery of claim 1, wherein the IC circuit section further includes an internal oscillator for generating a sampling frequency so that the sample hold circuit section can perform sampling. The battery of claim 2, wherein the internal oscillator generates different frequencies according to the connected resistances so that the duration of voice varies.