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Voice recording apparatus and voice encoder

A technology of recording device and compiler, which is applied in speech analysis, instrumentation, stereo circuit arrangement, etc., can solve the problems of large power consumption, increase of circuit area, waste of performance, etc., and achieve the effect of small chip area and low power consumption

Inactive Publication Date: 2007-05-23
PROLIFIC TECH INC
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AI Technical Summary

Problems solved by technology

If it is only used for voice recording, such as human voice recording and general voice notes, for low-level applications such as recording quality, in addition to high power consumption, resulting in shorter battery life, the circuit area is also an additional increase in manufacturing costs.
Therefore, using high-resolution Δ-Σ ADCs for low-level audio applications such as voice recording is a waste of effective energy.

Method used

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  • Voice recording apparatus and voice encoder
  • Voice recording apparatus and voice encoder

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Embodiment Construction

[0029] FIG. 1 is a structural diagram of a speech and audio compiler 100 according to an embodiment of the present invention. Speech audio compiler 100 includes multiplexer 101, adjustable gain amplifier 102, SAR-ADC 103, pulse code modulation digital circuit 104, delta-sigma DAC 106 and 107, low-pass filter 108 and 109, headphone amplifier 110 , and a clock generator 105 . The voice and audio compiler 100 has functions of voice recording and music playback.

[0030] During recording, firstly, the multiplexer 101 receives the left channel input signal LIN and the right channel input signal RIN, and alternately outputs the left channel input signal LIN and the right channel input signal RIN according to the clock signal Fs. In this embodiment, when the clock signal Fs is logic 0, the multiplexer 101 outputs the left channel input signal LIN, and if the clock signal Fs is logic 1, the multiplexer 101 outputs the right channel input signal RIN . In other embodiments of the pre...

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Abstract

The invention relates to a voice recorder and relative voice coder / decoder, wherein it comprises multiplexer, sequential analogue / digit converter, and pulse modulation digit circuit; the multiplexer via the first clock signal alternatively output left and right channel input signals; the converter is connected to the multiplexer, while its operation frequency is second clock signal, to convert the left and right channel input signals into digit signals; the pulse modulation digit circuit converts the output signal of converter from serial digit code into parallel digit code.

Description

technical field [0001] The present invention relates to a voice recording device and a voice-bandaudio CODEC, and in particular to a voice recording using a successive approximation analog-to-digital converter (successive approximation analog-to-digital converter, referred to as SAR-ADC) Device and Speech Audio Compiler. Background technique [0002] Δ-Σ theory (triangular integral theory) has been widely used in audio products, such as digital versatile disc (DVD: digital versatile disc) player, MP3 player, Walkman, Bluetooth (Bluetooth) headset, Universal Serial Bus (USB: universal serial bus) speakers, Internet voice technology (voice over Internet protocol, referred to as VoIP) and so on. The main reason is that the analog-to-digital converter (abbreviated as ADC) and digital-to-analog converter (abbreviated as DAC) of the delta-sigma architecture can provide higher resolution and better sound quality. [0003] However, there are many applications in audio products, a...

Claims

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Application Information

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IPC IPC(8): H04R5/04G10L19/00G10L19/012
Inventor 陈宣帆蔡中培
Owner PROLIFIC TECH INC
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